Ticket #39309: 39309.patch

wp-includes/sodium_compat/LICENSE

@@ +1 @@
+/*
+ * ISC License
+ *
+ * Copyright (c) 2016-2017
+ * Paragon Initiative Enterprises <security at paragonie dot com>
+ *
+ * Copyright (c) 2013-2017
+ * Frank Denis <j at pureftpd dot org>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+ No newline at end of file

wp-includes/sodium_compat/composer.json

@@ +1 @@
+{
+  "name": "paragonie/sodium_compat",
+  "description": "Pure PHP implementation of libsodium; uses the PHP extension if it exists",
+  "keywords": ["PHP", "cryptography", "elliptic curve", "side-channel resistant"],
+  "license": "ISC",
+  "authors": [
+    {
+      "name": "Paragon Initiative Enterprises",
+      "email": "security@paragonie.com"
+    },
+    {
+      "name": "Frank Denis",
+      "email": "jedisct1@pureftpd.org"
+    }
+  ],
+  "autoload": {
+    "files": ["autoload.php"]
+  },
+  "require": {
+    "php": "^5.2.4|^5.3|^5.4|^5.5|^5.6|^7",
+    "paragonie/random_compat": "^1|^2"
+  },
+  "require-dev": {
+    "phpunit/phpunit": "*"
+  }
+}
+ No newline at end of file

wp-includes/sodium_compat/src/Core/Poly1305.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Poly1305
+ */
+abstract class ParagonIE_Sodium_Core_Poly1305 extends ParagonIE_Sodium_Core_Util
+{
+    const BLOCK_SIZE = 16;
+
+    /**
+     * @param string $m
+     * @param string $key
+     * @return string
+     */
+    public static function onetimeauth($m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        return $state->update($m)->finish();
+    }
+
+    /**
+     * @param string $mac
+     * @param string $m
+     * @param string $key
+     * @return bool
+     */
+    public static function onetimeauth_verify($mac, $m, $key)
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Key must be 32 bytes long.'
+            );
+        }
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            self::substr($key, 0, 32)
+        );
+        $calc = $state->update($m)->finish();
+        return self::verify_16($calc, $mac);
+    }
+}

wp-includes/sodium_compat/tests/unit/SipHashTest.php

@@ +1 @@
+<?php
+
+class SipHashTest extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_SipHash::add()
+     */
+    public function testAdd()
+    {
+        if (PHP_INT_SIZE === 4) {
+            $this->markTestSkipped('Test should be performed on a 64-bit OS');
+            return;
+        }
+
+        $vectors = array(
+            array(
+                0x0123456789abcdef,
+                0x456789abcdef0123,
+                0x468acf13579acf12
+            ),
+            array(
+                0x0000000100000000,
+                0x0000000000000100,
+                0x0000000100000100
+            ),
+            array(
+                0x0000000100000000,
+                0x0000000000000100,
+                0x0000000100000100
+            ),
+            array(
+                0x0fffffffffffffff,
+                0x0000000000000001,
+                0x1000000000000000
+            )
+        );
+        foreach ($vectors as $v) {
+            list($a, $b, $c) = $v;
+            # $this->assertSame($c, PHP_INT_MAX & ($a + $b));
+
+            $sA = array(
+                $a >> 32,
+                $a & 0xffffffff
+            );
+            $sB = array(
+                $b >> 32,
+                $b & 0xffffffff
+            );
+            $sC = array(
+                ($c >> 32) & 0xffffffff,
+                $c & 0xffffffff
+            );
+            $this->assertSame(
+                $sC,
+                ParagonIE_Sodium_Core_SipHash::add($sA, $sB)
+            );
+        }
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_SipHash::rotl_64()
+     */
+    public function testRotl64()
+    {
+        $this->assertSame(
+            array(0x00010000, 0x00000000),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 16),
+            'rotl_64 by 16'
+        );
+        $this->assertSame(
+            array(0x80000000, 0x00000000),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 31),
+            'rotl_64 by 31'
+        );
+        $this->assertSame(
+            array(0x80000000, 0x00000000),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 95),
+            'rotl_64 by 95 (reduce to 31)'
+        );
+        $this->assertSame(
+            array(0x00000000, 0x00000001),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 32),
+            'rotl_64 by 32'
+        );
+        $this->assertSame(
+            array(0x00000000, 0x00000008),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 35),
+            'rotl_64 by 35'
+        );
+        $this->assertSame(
+            array(0x00000000, 0x80000000),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 63),
+            'rotl_64 by 63'
+        );
+        $this->assertSame(
+            array(0x00000001, 0x00000000),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0x00000001, 0x00000000, 64),
+            'rotl_64 by 64'
+        );
+        $this->assertSame(
+            array(0x7DDF575A, 0x3BD5BD5B),
+            ParagonIE_Sodium_Core_SipHash::rotl_64(0xDEADBEEF, 0xABAD1DEA, 17),
+            'rotl_64 by 64'
+        );
+    }
+
+    /**
+     *
+     */
+    public function testCryptoShorthash()
+    {
+        $message = 'this is just a test message';
+        $key = str_repeat("\x80", 16);
+
+        $this->assertSame(
+            '3f188259b01151a7',
+            bin2hex(ParagonIE_Sodium_Compat::crypto_shorthash($message, $key))
+        );
+    }
+}
+ No newline at end of file

wp-includes/sodium_compat/tests/unit/Poly1305Test.php

@@ +1 @@
+<?php
+
+class Poly1305Test extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Poly1305::onetimeauth()
+     * @ref https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04#page-12
+     */
+    public function testVectorA()
+    {
+        $msg = ParagonIE_Sodium_Core_Util::hex2bin('0000000000000000000000000000000000000000000000000000000000000000');
+        $key = ParagonIE_Sodium_Core_Util::hex2bin('746869732069732033322d62797465206b657920666f7220506f6c7931333035');
+        $this->assertSame(
+            '49ec78090e481ec6c26b33b91ccc0307',
+            bin2hex(ParagonIE_Sodium_Core_Poly1305::onetimeauth($msg, $key)),
+            'crypto_onetimeauth is broken'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Poly1305::onetimeauth()
+     * @ref https://tools.ietf.org/html/draft-agl-tls-chacha20poly1305-04#page-12
+     */
+    public function testVectorB()
+    {
+
+        $msg = ParagonIE_Sodium_Core_Util::hex2bin('48656c6c6f20776f726c6421');
+        $key = ParagonIE_Sodium_Core_Util::hex2bin('746869732069732033322d62797465206b657920666f7220506f6c7931333035');
+        $this->assertSame(
+            'a6f745008f81c916a20dcc74eef2b2f0',
+            bin2hex(ParagonIE_Sodium_Core_Poly1305::onetimeauth($msg, $key)),
+            'crypto_onetimeauth is broken'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Poly1305::onetimeauth()
+     *
+     * A large message test vector.
+     *
+     * @ref https://github.com/jedisct1/libsodium/blob/master/test/default/onetimeauth2.c
+     */
+    public function testVectorC()
+    {
+
+        $msg = ParagonIE_Sodium_Core_Util::intArrayToString(
+            array(
+                0x8e, 0x99, 0x3b, 0x9f, 0x48, 0x68, 0x12, 0x73, 0xc2, 0x96, 0x50, 0xba,
+                0x32, 0xfc, 0x76, 0xce, 0x48, 0x33, 0x2e, 0xa7, 0x16, 0x4d, 0x96, 0xa4,
+                0x47, 0x6f, 0xb8, 0xc5, 0x31, 0xa1, 0x18, 0x6a, 0xc0, 0xdf, 0xc1, 0x7c,
+                0x98, 0xdc, 0xe8, 0x7b, 0x4d, 0xa7, 0xf0, 0x11, 0xec, 0x48, 0xc9, 0x72,
+                0x71, 0xd2, 0xc2, 0x0f, 0x9b, 0x92, 0x8f, 0xe2, 0x27, 0x0d, 0x6f, 0xb8,
+                0x63, 0xd5, 0x17, 0x38, 0xb4, 0x8e, 0xee, 0xe3, 0x14, 0xa7, 0xcc, 0x8a,
+                0xb9, 0x32, 0x16, 0x45, 0x48, 0xe5, 0x26, 0xae, 0x90, 0x22, 0x43, 0x68,
+                0x51, 0x7a, 0xcf, 0xea, 0xbd, 0x6b, 0xb3, 0x73, 0x2b, 0xc0, 0xe9, 0xda,
+                0x99, 0x83, 0x2b, 0x61, 0xca, 0x01, 0xb6, 0xde, 0x56, 0x24, 0x4a, 0x9e,
+                0x88, 0xd5, 0xf9, 0xb3, 0x79, 0x73, 0xf6, 0x22, 0xa4, 0x3d, 0x14, 0xa6,
+                0x59, 0x9b, 0x1f, 0x65, 0x4c, 0xb4, 0x5a, 0x74, 0xe3, 0x55, 0xa5
+            )
+        );;
+        $key = ParagonIE_Sodium_Core_Util::intArrayToString(
+            array(
+                0xee, 0xa6, 0xa7, 0x25, 0x1c, 0x1e, 0x72, 0x91, 0x6d, 0x11, 0xc2,
+                0xcb, 0x21, 0x4d, 0x3c, 0x25, 0x25, 0x39, 0x12, 0x1d, 0x8e, 0x23,
+                0x4e, 0x65, 0x2d, 0x65, 0x1f, 0xa4, 0xc8, 0xcf, 0xf8, 0x80
+            )
+        );
+        $tag = ParagonIE_Sodium_Core_Util::intArrayToString(
+            array(
+                0xf3, 0xff, 0xc7, 0x70, 0x3f, 0x94, 0x00, 0xe5,
+                0x2a, 0x7d, 0xfb, 0x4b, 0x3d, 0x33, 0x05, 0xd9
+            )
+        );
+
+        $this->assertSame(
+            bin2hex($tag),
+            bin2hex(ParagonIE_Sodium_Core_Poly1305::onetimeauth($msg, $key)),
+            'crypto_onetimeauth is broken'
+        );
+        $this->assertTrue(
+            ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify($tag, $msg, $key),
+            'crypto_onetimeauth_verify is broken'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify()
+     */
+    public function testRandomVerify()
+    {
+        $msg = random_bytes(random_int(1, 1000));
+        $key = random_bytes(32);
+
+        $mac = ParagonIE_Sodium_Core_Poly1305::onetimeauth($msg, $key);
+        $this->assertTrue(
+            ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify($mac, $msg, $key),
+            'crypto_onetimeauth_verify is broken'
+        );
+    }
+}
+ No newline at end of file

wp-includes/sodium_compat/tests/unit/Salsa20Test.php

@@ +1 @@
+<?php
+
+class Salsa20Test extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Salsa20::rotate()
+     */
+    public function testRotate()
+    {
+        $this->assertEquals(
+            0x00001000,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x00000001, 12),
+            'Left rotate by 12'
+        );
+
+        $this->assertEquals(
+            0x00002000,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x00000001, 13),
+            'Left rotate by 13'
+        );
+        $this->assertEquals(
+            0x10000000,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x00000001, 28),
+            'Left rotate by 28'
+        );
+        $this->assertEquals(
+            0x80000000,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x00000001, 31),
+            'Left rotate by 31'
+        );
+        $this->assertEquals(
+            0x00000001,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x00000001, 32),
+            'Left rotate by 32'
+        );
+
+        $this->assertEquals(
+            0xf0001000,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x000f0001, 12),
+            'Left rotate by 12'
+        );
+
+        $this->assertEquals(
+            0xe0002001,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x000f0001, 13),
+            'Left rotate by 13'
+        );
+
+        $this->assertEquals(
+            0xc0004003,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x000f0001, 14),
+            'Left rotate by 14'
+        );
+
+        $this->assertEquals(
+            0x80008007,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x000f0001, 15),
+            'Left rotate by 15'
+        );
+
+        $this->assertEquals(
+            0x0001000f,
+            ParagonIE_Sodium_Core_Salsa20::rotate(0x000f0001, 16),
+            'Left rotate by 16'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Salsa20::salsa20()
+     */
+    public function testVectors()
+    {
+        $key = "\x80" . str_repeat("\x00", 31);
+        $iv = str_repeat("\x00", 8);
+
+        $output = ParagonIE_Sodium_Core_Salsa20::salsa20(512, $iv, $key);
+
+        $this->assertSame(
+            'E3BE8FDD8BECA2E3EA8EF9475B29A6E7' .
+            '003951E1097A5C38D23B7A5FAD9F6844' .
+            'B22C97559E2723C7CBBD3FE4FC8D9A07' .
+            '44652A83E72A9C461876AF4D7EF1A117',
+            strtoupper(
+                bin2hex(
+                    ParagonIE_Sodium_Core_Util::substr($output, 0, 64)
+                )
+            ),
+            'Test vector #1 failed!'
+        );
+
+        $this->assertSame(
+            '57BE81F47B17D9AE7C4FF15429A73E10' .
+            'ACF250ED3A90A93C711308A74C6216A9' .
+            'ED84CD126DA7F28E8ABF8BB63517E1CA' .
+            '98E712F4FB2E1A6AED9FDC73291FAA17',
+            strtoupper(
+                bin2hex(
+                    ParagonIE_Sodium_Core_Util::substr($output, 192, 64)
+                )
+            ),
+            'Test vector #1 failed!'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Salsa20::core_salsa20()
+     */
+    public function testCoreSalsa20()
+    {
+        $key = random_bytes(32);
+        $iv = random_bytes(8);
+        $outA = ParagonIE_Sodium_Core_Salsa20::salsa20(192, $iv, $key);
+
+        // First block
+        $outB = ParagonIE_Sodium_Core_Salsa20::core_salsa20($iv . str_repeat("\x00", 8), $key);
+        $this->assertSame(
+            bin2hex(
+                ParagonIE_Sodium_Core_Util::substr($outA, 0, 64)
+            ),
+            bin2hex($outB)
+        );
+
+        // Second block
+        $outC = ParagonIE_Sodium_Core_Salsa20::core_salsa20($iv . "\x01" . str_repeat("\x00", 7), $key);
+        $this->assertSame(
+            bin2hex(
+                ParagonIE_Sodium_Core_Util::substr($outA, 64, 64)
+            ),
+            bin2hex($outC)
+        );
+
+        // Third block
+        $outD = ParagonIE_Sodium_Core_Salsa20::core_salsa20($iv . "\x02" . str_repeat("\x00", 7), $key);
+        $this->assertSame(
+            bin2hex(
+                ParagonIE_Sodium_Core_Util::substr($outA, 128, 64)
+            ),
+            bin2hex($outD)
+        );
+    }
+}

wp-admin/includes/class-wp-upgrader.php

@@ -50 +50 @@
  */
 class WP_Upgrader {
 
+    const ED25519_PUBLIC_KEY = '4d6236cc44829b2f96a26d905aec92162077ef5aa7e0a4e2a6d251258dc83bd1';
+
         /**
          * The error/notification strings used to update the user on the progress.
          *
@@ -274 +276 @@
 
                 $this->skin->feedback('downloading_package', $package);
 
-                $download_file = download_url($package);
+                $download_file = download_url($package, 300, self::ED25519_PUBLIC_KEY);
+                if ( is_wp_error($download_file) ) {
+            if ($download_file->get_error_code() === 'ed25519_mismatch') {
+                $package .= '?ed25519failed=1';
+                // Try again without Ed25519 verification. Remove this silent fallback in the next version.
+                $download_file = download_url($package);
+            }
+        }
 
                 if ( is_wp_error($download_file) )
                         return new WP_Error('download_failed', $this->strings['download_failed'], $download_file->get_error_message());

wp-includes/sodium_compat/README.md

@@ +1 @@
+# Sodium Compat
+
+[![Build Status](https://travis-ci.org/paragonie/sodium_compat.svg?branch=master)](https://travis-ci.org/paragonie/sodium_compat)
+[![Latest Stable Version](https://poser.pugx.org/paragonie/sodium_compat/v/stable)](https://packagist.org/packages/paragonie/sodium_compat)
+[![Latest Unstable Version](https://poser.pugx.org/paragonie/sodium_compat/v/unstable)](https://packagist.org/packages/paragonie/sodium_compat)
+[![License](https://poser.pugx.org/paragonie/sodium_compat/license)](https://packagist.org/packages/paragonie/sodium_compat)
+
+Sodium Compat is a pure PHP polyfill for the Sodium cryptography library 
+(libsodium), otherwise [available in PECL](https://pecl.php.net/package/libsodium).
+
+This library tentativeley supports PHP 5.2.4 - 7.x (latest), but officially
+only supports [non-EOL'd versions of PHP](https://secure.php.net/supported-versions.php).
+
+If you have the PHP extension installed, Sodium Compat will opportunistically
+and transparently use the PHP extension instead of our implementation.
+
+## IMPORTANT!
+
+### ![Danger: Experimental](https://camo.githubusercontent.com/275bc882f21b154b5537b9c123a171a30de9e6aa/68747470733a2f2f7261772e6769746875622e636f6d2f63727970746f7370686572652f63727970746f7370686572652f6d61737465722f696d616765732f6578706572696d656e74616c2e706e67)
+
+This is an **experimental** cryptography library. It has not been formally
+audited by an independent third party that specializes in cryptography or
+cryptanalysis.
+
+Until it has received a clean bill of health from independent computer security
+experts, **use this library at your own risk.** 
+
+# Installing Sodium Compat
+
+If you're using Composer:
+
+```bash
+composer require paragonie/sodium_compat
+```
+
+If you're not using Composer, download a [release tarball](https://github.com/paragonie/sodium_compat/releases)
+(which should be signed with [our GnuPG public key](https://paragonie.com/static/gpg-public-key.txt)), extract
+its contents, then include our `autoload.php` script in your project.
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+```
+
+# Using Sodium Compat
+
+## True Polyfill
+
+If you're using PHP 5.3.0 or newer and do not have the PECL extension installed,
+you can just use the [standard ext/sodium API features as-is](https://paragonie.com/book/pecl-libsodium)
+and the polyfill will work its magic.
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+
+$alice_kp = \Sodium\crypto_sign_keypair();
+$alice_sk = \Sodium\crypto_sign_secretkey($alice_kp);
+$alice_pk = \Sodium\crypto_sign_publickey($alice_kp);
+
+$message = 'This is a test message.';
+$signature = \Sodium\crypto_sign_detached($message, $alice_sk);
+if (\Sodium\crypto_sign_verify_detached($signature, $message, $alice_pk)) {
+    echo 'OK', PHP_EOL;
+} else {
+    throw new Exception('Invalid signature');
+}
+```
+
+The polyfill does not expose this API on PHP < 5.3, or if you have the PHP
+extension installed already.
+
+## General-Use Polyfill
+
+If your users are on PHP < 5.3, or you want to write code that will work
+whether or not the PECL extension is available, you'll want to use the
+**`ParagonIE_Sodium_Compat`** class for most of your libsodium needs.
+
+The above example, written for general use:
+
+```php
+<?php
+require_once "/path/to/sodium_compat/autoload.php";
+
+$alice_kp = ParagonIE_Sodium_Compat::crypto_sign_keypair();
+$alice_sk = ParagonIE_Sodium_Compat::crypto_sign_secretkey($alice_kp);
+$alice_pk = ParagonIE_Sodium_Compat::crypto_sign_publickey($alice_kp);
+
+$message = 'This is a test message.';
+$signature = ParagonIE_Sodium_Compat::crypto_sign_detached($message, $alice_sk);
+if (ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $alice_pk)) {
+    echo 'OK', PHP_EOL;
+} else {
+    throw new Exception('Invalid signature');
+}
+```
+
+Generally: If you replace `\Sodium\ ` with `ParagonIE_Sodium_Compat::`, any
+code already written for the libsodium PHP extension should work with our
+polyfill without additional code changes.
+
+To learn how to use Libsodium, read [*Using Libsodium in PHP Projects*](https://paragonie.com/book/pecl-libsodium).
+
+## API Coverage
+
+* Mainline NaCl Features
+    * `crypto_auth()`
+    * `crypto_auth_verify()`
+    * `crypto_box()`
+    * `crypto_box_open()`
+    * `crypto_scalarmult()`
+    * `crypto_secretbox()`
+    * `crypto_secretbox_open()`
+    * `crypto_sign()`
+    * `crypto_sign_open()`
+* PECL Libsodium Features
+    * `crypto_box_seal()`
+    * `crypto_box_seal_open()`
+    * `crypto_generichash()`
+    * `crypto_generichash_init()`
+    * `crypto_generichash_update()`
+    * `crypto_generichash_final()`
+    * `crypto_kx()`
+    * `crypto_shorthash()`
+    * `crypto_sign_detached()`
+    * `crypto_sign_verify_detached()`
+    * For advanced users only:
+        * `crypto_stream()`
+        * `crypto_stream_xor()`
+    * Other utilities (e.g. `crypto_*_keypair()`)
+
+### Features Excluded from this Polyfill
+
+* `\Sodium\memzero()` - Although we expose this API endpoint, it's a NOP. We can't
+  reliably zero buffers from PHP.
+* `\Sodium\crypto_pwhash()` - It's not feasible to polyfill scrypt or Argon2 into PHP and get
+  reasonable performance. Users would feel motivated to select parameters that downgrade
+  security to avoid denial of service (DoS) attacks.
+  
+  The only winning move is not to play.

wp-includes/sodium_compat/src/Core/Poly1305/State.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Poly1305_State
+ */
+class ParagonIE_Sodium_Core_Poly1305_State extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @var int[]
+     */
+    protected $buffer = array();
+
+    /**
+     * @var bool
+     */
+    protected $final = false;
+
+    /**
+     * @var int[]
+     */
+    public $h;
+
+    /**
+     * @var int
+     */
+    protected $leftover = 0;
+
+    /**
+     * @var int[]
+     */
+    public $r;
+
+    /**
+     * @var int[]
+     */
+    public $pad;
+
+    /**
+     * ParagonIE_Sodium_Core_Poly1305_State constructor.
+     * @param string $key
+     */
+    public function __construct($key = '')
+    {
+        if (self::strlen($key) < 32) {
+            throw new InvalidArgumentException(
+                'Poly1305 requires a 32-byte key'
+            );
+        }
+        /* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
+        $this->r = array(
+            (self::load_4(self::substr($key,  0, 4))     ) & 0x3ffffff,
+            (self::load_4(self::substr($key,  3, 4)) >> 2) & 0x3ffff03,
+            (self::load_4(self::substr($key,  6, 4)) >> 4) & 0x3ffc0ff,
+            (self::load_4(self::substr($key,  9, 4)) >> 6) & 0x3f03fff,
+            (self::load_4(self::substr($key, 12, 4)) >> 8) & 0x00fffff
+        );
+
+        /* h = 0 */
+        $this->h = array(0, 0, 0, 0, 0);
+
+        /* save fpad for later */
+        $this->pad = array(
+            self::load_4(self::substr($key, 16, 4)),
+            self::load_4(self::substr($key, 20, 4)),
+            self::load_4(self::substr($key, 24, 4)),
+            self::load_4(self::substr($key, 28, 4)),
+        );
+
+        $this->leftover = 0;
+        $this->final = false;
+    }
+
+    /**
+     * @param string $message
+     * @return self
+     */
+    public function update($message = '')
+    {
+        $bytes = self::strlen($message);
+
+        /* handle leftover */
+        if ($this->leftover) {
+            $want = ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - $this->leftover;
+            if ($want > $bytes) {
+                $want = $bytes;
+            }
+            for ($i = 0; $i < $want; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            // We snip off the leftmost bytes.
+            $message = self::substr($message, $want);
+            $bytes = self::strlen($message);
+            $this->leftover += $want;
+            if ($this->leftover < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                // We still don't have enough to run $this->blocks()
+                return $this;
+            }
+
+            $this->blocks(
+                static::intArrayToString($this->buffer),
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+            $this->leftover = 0;
+        }
+
+        /* process full blocks */
+        if ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+            $want = $bytes & ~(ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE - 1);
+            if ($want >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                $block = self::substr($message, 0, $want);
+                if (self::strlen($block) >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+                    $this->blocks($block, $want);
+                    $message = self::substr($message, $want);
+                    $bytes = self::strlen($message);
+                }
+            }
+        }
+
+        /* store leftover */
+        if ($bytes) {
+            for ($i = 0; $i < $bytes; ++$i) {
+                $mi = self::chrToInt($message[$i]);
+                $this->buffer[$this->leftover + $i] = $mi;
+            }
+            $this->leftover = (int) $this->leftover + $bytes;
+        }
+        return $this;
+    }
+
+    /**
+     * @param string $message
+     * @param int $bytes
+     * @return self
+     */
+    public function blocks($message, $bytes)
+    {
+        if (self::strlen($message) < 16) {
+            $message = str_pad($message, 16, "\x00", STR_PAD_RIGHT);
+        }
+        $hibit = $this->final ? 0 : 1 << 24; /* 1 << 128 */
+        $r0 = (int) $this->r[0];
+        $r1 = (int) $this->r[1];
+        $r2 = (int) $this->r[2];
+        $r3 = (int) $this->r[3];
+        $r4 = (int) $this->r[4];
+
+        $s1 = $r1 * 5;
+        $s2 = $r2 * 5;
+        $s3 = $r3 * 5;
+        $s4 = $r4 * 5;
+
+        $h0 = $this->h[0];
+        $h1 = $this->h[1];
+        $h2 = $this->h[2];
+        $h3 = $this->h[3];
+        $h4 = $this->h[4];
+
+        while ($bytes >= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE) {
+            /* h += m[i] */
+            $h0 +=  self::load_4(self::substr($message,  0, 4))       & 0x3ffffff;
+            $h1 += (self::load_4(self::substr($message,  3, 4)) >> 2) & 0x3ffffff;
+            $h2 += (self::load_4(self::substr($message,  6, 4)) >> 4) & 0x3ffffff;
+            $h3 += (self::load_4(self::substr($message,  9, 4)) >> 6) & 0x3ffffff;
+            $h4 += (self::load_4(self::substr($message, 12, 4)) >> 8) | $hibit;
+
+            /* h *= r */
+            $d0 = (
+                ($h0 * $r0) +
+                ($h1 * $s4) +
+                ($h2 * $s3) +
+                ($h3 * $s2) +
+                ($h4 * $s1)
+            );
+            $d1 = (
+                ($h0 * $r1) +
+                ($h1 * $r0) +
+                ($h2 * $s4) +
+                ($h3 * $s3) +
+                ($h4 * $s2)
+            );
+
+            $d2 = (
+                ($h0 * $r2) +
+                ($h1 * $r1) +
+                ($h2 * $r0) +
+                ($h3 * $s4) +
+                ($h4 * $s3)
+            );
+
+            $d3 = (
+                ($h0 * $r3) +
+                ($h1 * $r2) +
+                ($h2 * $r1) +
+                ($h3 * $r0) +
+                ($h4 * $s4)
+            );
+
+            $d4 = (
+                ($h0 * $r4) +
+                ($h1 * $r3) +
+                ($h2 * $r2) +
+                ($h3 * $r1) +
+                ($h4 * $r0)
+            );
+
+            /* (partial) h %= p */
+                                 $c = $d0 >> 26; $h0 = $d0 & 0x3ffffff;
+            $d1 += $c;           $c = $d1 >> 26; $h1 = $d1 & 0x3ffffff;
+            $d2 += $c;           $c = $d2 >> 26; $h2 = $d2 & 0x3ffffff;
+            $d3 += $c;           $c = $d3 >> 26; $h3 = $d3 & 0x3ffffff;
+            $d4 += $c;           $c = $d4 >> 26; $h4 = $d4 & 0x3ffffff;
+            $h0 += (int) $c * 5; $c = $h0 >> 26; $h0 &= 0x3ffffff;
+            $h1 += $c;
+
+            // Chop off the left 32 bytes.
+            $message = self::substr(
+                $message,
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+            $bytes -= ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE;
+        }
+
+        $this->h = array(
+            (int) $h0 & 0xffffffff,
+            (int) $h1 & 0xffffffff,
+            (int) $h2 & 0xffffffff,
+            (int) $h3 & 0xffffffff,
+            (int) $h4 & 0xffffffff
+        );
+        return $this;
+    }
+
+    /**
+     * @return string
+     */
+    public function finish()
+    {
+        /* process the remaining block */
+        if ($this->leftover) {
+            $i = $this->leftover;
+            $this->buffer[$i++] = 1;
+            for (; $i < ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE; ++$i) {
+                $this->buffer[$i] = 0;
+            }
+            $this->final = true;
+            $this->blocks(
+                self::substr(
+                    static::intArrayToString($this->buffer),
+                    0,
+                    ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+                ),
+                ParagonIE_Sodium_Core_Poly1305::BLOCK_SIZE
+            );
+        }
+
+        $h0 = (int) $this->h[0];
+        $h1 = (int) $this->h[1];
+        $h2 = (int) $this->h[2];
+        $h3 = (int) $this->h[3];
+        $h4 = (int) $this->h[4];
+
+                       $c = $h1 >> 26; $h1 &= 0x3ffffff;
+        $h2 += $c;     $c = $h2 >> 26; $h2 &= 0x3ffffff;
+        $h3 += $c;     $c = $h3 >> 26; $h3 &= 0x3ffffff;
+        $h4 += $c;     $c = $h4 >> 26; $h4 &= 0x3ffffff;
+        $h0 += $c * 5; $c = $h0 >> 26; $h0 &= 0x3ffffff;
+        $h1 += $c;
+
+        /* compute h + -p */
+        $g0 = $h0 +  5; $c = $g0 >> 26; $g0 &= 0x3ffffff;
+        $g1 = $h1 + $c; $c = $g1 >> 26; $g1 &= 0x3ffffff;
+        $g2 = $h2 + $c; $c = $g2 >> 26; $g2 &= 0x3ffffff;
+        $g3 = $h3 + $c; $c = $g3 >> 26; $g3 &= 0x3ffffff;
+        $g4 = ($h4 + $c - (1 << 26)) & 0xffffffff;
+
+        /* select h if h < p, or h + -p if h >= p */
+        $mask = ($g4 >> 31) - 1;
+
+        $g0 &= $mask;
+        $g1 &= $mask;
+        $g2 &= $mask;
+        $g3 &= $mask;
+        $g4 &= $mask;
+
+        $mask = ~$mask & 0xffffffff;
+        $h0 = ($h0 & $mask) | $g0;
+        $h1 = ($h1 & $mask) | $g1;
+        $h2 = ($h2 & $mask) | $g2;
+        $h3 = ($h3 & $mask) | $g3;
+        $h4 = ($h4 & $mask) | $g4;
+
+        /* h = h % (2^128) */
+        $h0 = (($h0      ) | ($h1 << 26)) & 0xffffffff;
+        $h1 = (($h1 >>  6) | ($h2 << 20)) & 0xffffffff;
+        $h2 = (($h2 >> 12) | ($h3 << 14)) & 0xffffffff;
+        $h3 = (($h3 >> 18) | ($h4 <<  8)) & 0xffffffff;
+
+        /* mac = (h + pad) % (2^128) */
+        $f = ($h0 + $this->pad[0]);
+        $h0 = (int) $f;
+        $f = ($h1 + $this->pad[1] + ($f >> 32));
+        $h1 = (int) $f;
+        $f = ($h2 + $this->pad[2] + ($f >> 32));
+        $h2 = (int) $f;
+        $f = ($h3 + $this->pad[3] + ($f >> 32));
+        $h3 = (int) $f;
+
+        return self::store32_le($h0 & 0xffffffff) .
+            self::store32_le($h1 & 0xffffffff) .
+            self::store32_le($h2 & 0xffffffff) .
+            self::store32_le($h3 & 0xffffffff);
+    }
+}

wp-includes/sodium_compat/src/Core/Util.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Util
+ */
+abstract class ParagonIE_Sodium_Core_Util
+{
+    /**
+     * Load a 3 character substring into an integer
+     *
+     * @param $string
+     * @return int;
+     */
+    public static function load_3($string)
+    {
+        $result = self::chrToInt($string[0]);
+        $result |= self::chrToInt($string[1]) << 8;
+        $result |= self::chrToInt($string[2]) << 16;
+        return $result & 0xffffff;
+    }
+
+    /**
+     * Load a 4 character substring into an integer
+     *
+     * @param $string
+     * @return int
+     * @throws Exception
+     */
+    public static function load_4($string)
+    {
+        if (self::strlen($string) < 4) {
+            throw new Exception('String must be 4 bytes or more; ' . self::strlen($string) . ' given.');
+        }
+        $result = self::chrToInt($string[0]) & 0xff;
+        $result |= (self::chrToInt($string[1]) & 0xff) << 8;
+        $result |= (self::chrToInt($string[2]) & 0xff) << 16;
+        $result |= (self::chrToInt($string[3]) & 0xff) << 24;
+        return $result & 0xffffffff;
+    }
+
+    /**
+     * Store a 24-bit integer into a string, treating it as big-endian.
+     *
+     * @param $int
+     * @return string
+     */
+    public static function store_3($int)
+    {
+        return self::intToChr(($int >> 16)    & 0xff) .
+            self::intToChr(($int >> 8)     & 0xff) .
+            self::intToChr( $int           & 0xff);
+    }
+
+    /**
+     * Store a 32-bit integer into a string, treating it as big-endian.
+     *
+     * @param $int
+     * @return string
+     */
+    public static function store_4($int)
+    {
+        return self::intToChr(($int >> 24) & 0xff) .
+            self::intToChr(($int >> 16)    & 0xff) .
+            self::intToChr(($int >> 8)     & 0xff) .
+            self::intToChr( $int           & 0xff);
+    }
+
+    /**
+     * Store a 32-bit integer into a string, treating it as little-endian.
+     *
+     * @param $int
+     * @return string
+     */
+    public static function store32_le($int)
+    {
+        return self::intToChr($int      & 0xff) .
+            self::intToChr(($int >> 8)  & 0xff) .
+            self::intToChr(($int >> 16) & 0xff) .
+            self::intToChr(($int >> 24) & 0xff);
+    }
+
+    /**
+     * Convert a binary string into a hexadecimal string without cache-timing
+     * leaks
+     *
+     * @param string $bin_string (raw binary)
+     * @return string
+     */
+    public static function bin2hex($bin_string)
+    {
+        $hex = '';
+        $len = self::strlen($bin_string);
+        for ($i = 0; $i < $len; ++$i) {
+            $chunk = unpack('C', self::substr($bin_string, $i, 2));
+            $c = $chunk[1] & 0xf;
+            $b = $chunk[1] >> 4;
+            $hex .= pack(
+                'CC',
+                (87 + $b + ((($b - 10) >> 8) & ~38)),
+                (87 + $c + ((($c - 10) >> 8) & ~38))
+            );
+        }
+        return $hex;
+    }
+
+    /**
+     * Convert a binary string into a hexadecimal string without cache-timing
+     * leaks, returning uppercase letters (as per RFC 4648)
+     *
+     * @param string $bin_string (raw binary)
+     * @return string
+     */
+    public static function bin2hexUpper($bin_string)
+    {
+        $hex = '';
+        $len = self::strlen($bin_string);
+        for ($i = 0; $i < $len; ++$i) {
+            $chunk = unpack('C', self::substr($bin_string, $i, 2));
+            $c = $chunk[1] & 0xf;
+            $b = $chunk[1] >> 4;
+            $hex .= pack(
+                'CC',
+                (55 + $b + ((($b - 10) >> 8) & ~6)),
+                (55 + $c + ((($c - 10) >> 8) & ~6))
+            );
+        }
+        return $hex;
+    }
+
+    /**
+     * Compares two strings.
+     *
+     * @param string $left
+     * @param string $right
+     * @param int $len
+     * @return int
+     */
+    public static function compare($left, $right, $len = null)
+    {
+        $leftLen = self::strlen($left);
+        $rightLen = self::strlen($right);
+        if ($len === null) {
+            $len = max($leftLen, $rightLen);
+            $left = str_pad($left, $len, "\x00", STR_PAD_RIGHT);
+            $right = str_pad($right, $len, "\x00", STR_PAD_RIGHT);
+        }
+
+        $gt = 0;
+        $eq = 1;
+        $i = $len;
+        while ($i !== 0) {
+            --$i;
+            $gt |= ((self::chrToInt($right[$i]) - self::chrToInt($left[$i])) >> 8) & $eq;
+            $eq &= ((self::chrToInt($right[$i]) ^ self::chrToInt($left[$i])) - 1) >> 8;
+        }
+        return ($gt + $gt + $eq) - 1;
+    }
+
+    /**
+     * @param string $left
+     * @param string $right
+     * @return int
+     */
+    public static function memcmp($left, $right)
+    {
+        if (hash_equals($left, $right)) {
+            return 0;
+        }
+        return -1;
+    }
+
+    /**
+     * Convert a hexadecimal string into a binary string without cache-timing
+     * leaks
+     *
+     * @param string $hexString
+     * @param bool $strictPadding
+     * @return string (raw binary)
+     * @throws RangeException
+     */
+    public static function hex2bin($hexString, $strictPadding = false)
+    {
+        $hex_pos = 0;
+        $bin = '';
+        $c_acc = 0;
+        $hex_len = self::strlen($hexString);
+        $state = 0;
+        if (($hex_len & 1) !== 0) {
+            if ($strictPadding) {
+                throw new RangeException(
+                    'Expected an even number of hexadecimal characters'
+                );
+            } else {
+                $hexString = '0' . $hexString;
+                ++$hex_len;
+            }
+        }
+
+        $chunk = unpack('C*', $hexString);
+        while ($hex_pos < $hex_len) {
+            ++$hex_pos;
+            $c = $chunk[$hex_pos];
+            $c_num = $c ^ 48;
+            $c_num0 = ($c_num - 10) >> 8;
+            $c_alpha = ($c & ~32) - 55;
+            $c_alpha0 = (($c_alpha - 10) ^ ($c_alpha - 16)) >> 8;
+            if (($c_num0 | $c_alpha0) === 0) {
+                throw new RangeException(
+                    'hexEncode() only expects hexadecimal characters'
+                );
+            }
+            $c_val = ($c_num0 & $c_num) | ($c_alpha & $c_alpha0);
+            if ($state === 0) {
+                $c_acc = $c_val * 16;
+            } else {
+                $bin .= pack('C', $c_acc | $c_val);
+            }
+            $state ^= 1;
+        }
+        return $bin;
+    }
+
+    /**
+     * Cache-timing-safe variant of ord()
+     *
+     * @param string $chr
+     * @return int
+     */
+    public static function chrToInt($chr)
+    {
+        $chunk = unpack('C', self::substr($chr, 0, 1));
+        return $chunk[1];
+    }
+
+    /**
+     * Cache-timing-safe variant of ord()
+     *
+     * @param int $int
+     * @return string
+     */
+    public static function intToChr($int)
+    {
+        return pack('C', $int);
+    }
+
+    /**
+     * Turn a string into an array of integers
+     *
+     * @param $string
+     * @return int[]
+     */
+    public static function stringToIntArray($string)
+    {
+        return array_values(
+            unpack('C*', $string)
+        );
+    }
+
+    /**
+     * Turn an array of integers into a string
+     *
+     * @param int[] $ints
+     * @return string
+     */
+    public static function intArrayToString(array $ints)
+    {
+        $args = $ints;
+        foreach ($args as $i => $v) {
+            $args[$i] = $v & 0xff;
+        }
+        array_unshift($args, str_repeat('C', count($ints)));
+        return call_user_func_array('pack', $args);
+    }
+
+    /**
+     * Safe string length
+     *
+     * @ref mbstring.func_overload
+     *
+     * @param string $str
+     * @return int
+     */
+    public static function strlen($str)
+    {
+        if (!is_string($str)) {
+            throw new InvalidArgumentException('String expected');
+        }
+        if (function_exists('mb_strlen')) {
+            return mb_strlen($str, '8bit');
+        } else {
+            return strlen($str);
+        }
+    }
+
+    /**
+     * Safe substring
+     *
+     * @ref mbstring.func_overload
+     *
+     * @param string $str
+     * @param int $start
+     * @param int $length
+     * @return string
+     * @throws InvalidArgumentException
+     */
+    public static function substr($str, $start = 0, $length = null)
+    {
+        if (!is_string($str)) {
+            throw new InvalidArgumentException('String expected');
+        }
+        if (PHP_VERSION_ID < 50400 && $length === null) {
+            $length = self::strlen($str);
+        }
+        if (function_exists('mb_substr')) {
+            // $length calculation above might result in a 0-length string
+            if ($length === 0) {
+                return '';
+            }
+            return mb_substr($str, $start, $length, '8bit');
+        }
+        if ($length === 0) {
+            return '';
+        }
+        // Unlike mb_substr(), substr() doesn't accept NULL for length
+        if ($length !== null) {
+            return substr($str, $start, $length);
+        } else {
+            return substr($str, $start);
+        }
+    }
+
+    /**
+     * Compare a 16-character byte string in constant time.
+     *
+     * @param string $a
+     * @param string $b
+     * @return bool
+     */
+    public static function verify_16($a, $b)
+    {
+        $diff = self::strlen($a) ^ self::strlen($b);
+        for ($i = 0; $i < 16; ++$i) {
+            $diff |= self::chrToInt($a[$i]) ^ self::chrToInt($b[$i]);
+        }
+        return $diff === 0;
+    }
+
+    /**
+     * Compare a 32-character byte string in constant time.
+     *
+     * @param string $a
+     * @param string $b
+     * @return bool
+     */
+    public static function verify_32($a, $b)
+    {
+        $diff = self::strlen($a) ^ self::strlen($b);
+        for ($i = 0; $i < 32; ++$i) {
+            $diff |= self::chrToInt($a[$i]) ^ self::chrToInt($b[$i]);
+        }
+        return $diff === 0;
+    }
+
+    /**
+     * Calculate $a ^ $b for two strings.
+     *
+     * @param string $a
+     * @param string $b
+     * @return string
+     */
+    public static function xorStrings($a, $b)
+    {
+        $aLen = self::strlen($a);
+        $bLen = self::strlen($b);
+        $d = '';
+
+        for ($i = 0; $i < $aLen && $i < $bLen; ++$i) {
+            $d .= self::intToChr(self::chrToInt($a[$i]) ^ self::chrToInt($b[$i]));
+        }
+        return $d;
+    }
+}

wp-includes/sodium_compat/src/Core/Xsalsa20.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_XSalsa20
+ */
+abstract class ParagonIE_Sodium_Core_XSalsa20 extends ParagonIE_Sodium_Core_HSalsa20
+{
+    /**
+     * Expand a key and nonce into an xsalsa20 keystream.
+     *
+     * @param string $len
+     * @param string $nonce
+     * @param string $key
+     * @return string;
+     */
+    public static function xsalsa20($len, $nonce, $key)
+    {
+        $subkey = self::hsalsa20($nonce, $key);
+        $ret = self::salsa20($len, self::substr($nonce, 16, 8), $subkey);
+        ParagonIE_Sodium_Compat::memzero($subkey);
+        return $ret;
+    }
+
+    /**
+     * Encrypt a string with Xsalsa20. Doesn't provide integrity.
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    public static function xsalsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::xsalsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Ge/P2.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P2
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P2
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_P2 constructor.
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $x
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $y
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $z
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null
+    ) {
+        $this->X = $x;
+        $this->Y = $y;
+        $this->Z = $z;
+    }
+}

wp-includes/sodium_compat/tests/unit/Curve25519Test.php

@@ +1 @@
+<?php
+
+class Curve25519Test extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::fe_0()
+     */
+    public function testFe0()
+    {
+        $f = array(
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0
+        );
+        $fe_f = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($f);
+        $r = ParagonIE_Sodium_Core_Curve25519::fe_0();
+        for ($i = 0; $i < 10; ++$i) {
+            $this->assertEquals($r[$i], $fe_f[$i]);
+        }
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::fe_1()
+     */
+    public function testFe1()
+    {
+        $f = array(
+            1,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0
+        );
+        $fe_f = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($f);
+        $r = ParagonIE_Sodium_Core_Curve25519::fe_1();
+        for ($i = 0; $i < 10; ++$i) {
+            $this->assertEquals($r[$i], $fe_f[$i]);
+        }
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::fe_add()
+     */
+    public function testFeAdd()
+    {
+        $f = array(
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535)
+        );
+        $g = array(
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535)
+        );
+        $h = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = $f[$i] + $g[$i];
+        }
+
+        $fe_f = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($f);
+        $fe_g = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($g);
+        $fe_h = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+        $r = ParagonIE_Sodium_Core_Curve25519::fe_add($fe_f, $fe_g);
+
+        for ($i = 0; $i < 10; ++$i) {
+            $this->assertEquals($r[$i], $fe_h[$i]);
+        }
+        $this->assertEquals($r, $fe_h, 'Addition error!');
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::fe_sub()
+     */
+    public function testFeSub()
+    {
+        $f = array(
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535)
+        );
+        $g = array(
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535),
+            random_int(0, 65535)
+        );
+        $h = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = $f[$i] - $g[$i];
+        }
+
+        $fe_f = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($f);
+        $fe_g = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($g);
+        $fe_h = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+        $r = ParagonIE_Sodium_Core_Curve25519::fe_sub($fe_f, $fe_g);
+
+        for ($i = 0; $i < 10; ++$i) {
+            $this->assertEquals($r[$i], $fe_h[$i]);
+        }
+        $this->assertEquals($r, $fe_h, 'Subtraction error!');
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::sc_reduce()
+     */
+    public function testReduce()
+    {
+        $input = ParagonIE_Sodium_Core_Util::hex2bin(
+            "dc0e1b48b1f2d9d3a6638a43c986c49ecbfafba209fff7a801f9d8f776c1fc79" .
+            "5dd9dd8f4c272b92210c923ba7940955136f7e68c4bee52a6562f8171785ce10"
+        );
+        $reduced = ParagonIE_Sodium_Core_Curve25519::sc_reduce($input);
+        $this->assertSame(
+            'd8e7f39643da186a4a690c8cf6a7987bc4d2fb7bede4e7cec89f8175da27730a',
+            bin2hex($reduced),
+            'sd_reduce is not working'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::ge_select()
+     */
+    public function testGeSelect()
+    {
+        $this->assertEquals(
+            ParagonIE_Sodium_Core_Curve25519::ge_select(0, 6),
+            new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                    array(-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777)
+                ),
+                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                    array(-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737)
+                ),
+                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                    array(-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652)
+                )
+            ),
+            'ge_select is not working.'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::fe_mul()
+     */
+    public function testFeMul()
+    {
+        $f = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                26853523,
+                -15767542,
+                10850706,
+                -434120,
+                -20393796,
+                -13094191,
+                -4793868,
+                1643574,
+                11273642,
+                14083967
+            )
+        );
+
+        $g = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                -10913610,
+                13857413,
+                -15372611,
+                6949391,
+                114729,
+                -8787816,
+                -6275908,
+                -3247719,
+                -18696448,
+                -12055116
+            )
+        );
+
+        $expected = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                -25012118,
+                15881590,
+                -29167576,
+                -8241728,
+                -26366797,
+                6116011,
+                -16287663,
+                -1425685,
+                -9694368,
+                -16104023
+            )
+        );
+
+        $h = ParagonIE_Sodium_Core_Curve25519::fe_mul($f, $g);
+        $this->assertEquals($expected, $h);
+
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::fe_mul($h, ParagonIE_Sodium_Core_Curve25519::fe_1())
+        );
+
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::fe_mul(ParagonIE_Sodium_Core_Curve25519::fe_1(), $h)
+        );
+        $z = ParagonIE_Sodium_Core_Curve25519::fe_0();
+        $this->assertEquals(
+            $z,
+            ParagonIE_Sodium_Core_Curve25519::fe_mul($z, $h)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::ge_madd()
+     */
+    public function testGeMAdd()
+    {
+        $p = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            )
+        );
+
+        $q = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(18199695, 15951423, 10473290, -1707278, 17185920, -3916101, 28236412, -3959421, -27914454, -4383652)
+            )
+        );
+
+        $expected = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(6822752, 12972737, -17423887, -2541492, 49337140, -1332094, 22232867, -465068, 11581268, 26952514)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-23921176, -12752771, 47722613, 6898902, -3535904, 10418928, -16144387, -30914706, -8056612, 2780960)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            )
+        );
+
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::ge_madd($r, $p, $q),
+            'ge_madd is still broken'
+        );
+
+        // $this->assertSame(true, true); return;
+        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            )
+        );
+
+        $t = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 103743971)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-7798556, -16710257, -3033922, -2874086, -28997861, -2835604, -32406664, 3839045, 641708, 101325)
+            )
+        );
+
+        $expected = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(40636230, -22227939, -22139470, -1653985, -13868278, 26590734, 36390789, -5349578, 9774594, 9357215)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(6562474, 5615845, -247858, -13720847, 40341826, -5578024, -21461631, 24662468, 16343730, -3195865)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            )
+        );
+
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::ge_madd($r, $h, $t),
+            'ge_madd is not working'
+        );
+
+        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(1,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(0,0,0,0,0,0,0,0,0,0)
+            )
+        );
+
+        $t = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -53190817)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697)
+            )
+        );
+
+        $expected = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(8887381, -19880172, -48766734, 5332347, 4222066, 6803288, 3898648, -15003839, 26471233, -24129350)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(-34519169, -6072522, 5604248, 18236293, -54933382, -12304722, -27334454, 7374697, -27188123, 3706744)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            ),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+                array(2,0,0,0,0,0,0,0,0,0)
+            )
+        );
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::ge_madd($r, $h, $t),
+            'ge_madd is not working'
+        );
+    }
+
+    
+    public function testGeScalarmultBase()
+    {
+        $nonce = ParagonIE_Sodium_Core_Util::hex2bin(
+            'a5cdb7382d5282472312e739b7b8fded4b0bc73a8d3b7ac24e6ee259df74800a' .
+            'c19b35ef3130ed0474e0f0cc4d9ee277788775036b7025aed15c3beb29ff4eab'
+        );
+        $R = ParagonIE_Sodium_Core_Curve25519::ge_scalarmult_base($nonce);
+        $expected = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                -23932472,
+                11221871,
+                27518927,
+                -12970994,
+                14275856,
+                4619861,
+                -14347453,
+                6713345,
+                -33117680,
+                -10663750
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                14689788,
+                -10448958,
+                -30321432,
+                -9014186,
+                14446585,
+                -7985136,
+                27805771,
+                -13751241,
+                -1536736,
+                -13958946
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                19689758,
+                -6173146,
+                -15886452,
+                5649798,
+                -24861313,
+                -12384199,
+                -2662028,
+                16072970,
+                5918454,
+                14582476
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                -9719484,
+                -15496290,
+                -31004425,
+                -7546822,
+                12427063,
+                11453174,
+                -8594732,
+                -14149517,
+                27692259,
+                -14101917
+            ))
+        );
+        $this->assertEquals(
+            $expected,
+            $R,
+            'Check ge_scalarmult_base for correctness'
+        );
+
+        $bytes = ParagonIE_Sodium_Core_Curve25519::ge_p3_tobytes($R);
+        $this->assertSame(
+            '36a6d2748f6ab8f76c122a562d55343cb7c6f15c8a45bd55bd8b9e9fadd2363f',
+            bin2hex($bytes),
+            'Check ge_p3_tobytes for correctness'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Curve25519::ge_double_scalarmult_vartime()
+     */
+    public function testGeDoubleScalarMultVartime()
+    {
+        $h = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fc2ef90e2ddab38c55d0edbf41167048061a03b99d00112dcc92777c1b17300c' .
+            'bd84d56b93d272eb01a2ffb5557bda3922360e402c29d05cda3f0debabaf5ce5'
+        );
+        $A = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                25569346,
+                24607350,
+                21422669,
+                3164952,
+                51116803,
+                27944728,
+                23859688,
+                12129629,
+                33577468,
+                23235570
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                16253166, 2599808, 30616947, -12747262, 372730, 8894334, 9139202, -197177, -24298945, 15942855
+            )),
+            ParagonIE_Sodium_Core_Curve25519::fe_1(),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                -28155508, 13944970, 2511703, 16462880, 15250894, -7952383, -19629302, 16022930, 1783986, 16320964
+            ))
+        );
+        $sig = ParagonIE_Sodium_Core_Util::hex2bin(
+            '36a6d2748f6ab8f76c122a562d55343cb7c6f15c8a45bd55bd8b9e9fadd2363f' .
+            '370cb78fba42c550d487b9bd7413312b6490c8b3ee2cea638997172a9c8c250f'
+        );
+        $expected = new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                -18667682,
+                9847093,
+                7256576,
+                -7033042,
+                32767777,
+                -10224836,
+                25608854,
+                6989354,
+                -19138147,
+                -13642525
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                6317192,
+                4477233,
+                24373531,
+                14977415,
+                -10754696,
+                -12573560,
+                -20847592,
+                8319048,
+                13730645,
+                -7760907
+            )),
+            ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+                32680048,
+                -15342934,
+                3837898,
+                8050201,
+                15422085,
+                14178962,
+                -6403825,
+                -627297,
+                24243949,
+                12818173
+            ))
+        );
+
+        $this->assertEquals(
+            $expected,
+            ParagonIE_Sodium_Core_Curve25519::ge_double_scalarmult_vartime($h, $A, $sig),
+            'ge_double_scalarmult_vartime()'
+        );
+    }
+}

wp-includes/sodium_compat/tests/compat/SodiumCompatTest.php

@@ +1 @@
+<?php
+
+/**
+ * Class SodiumCompatTest
+ */
+class SodiumCompatTest extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        if (!extension_loaded('libsodium')) {
+            $this->markTestSkipped('Libsodium is not installed; skipping the compatibility test suite.');
+        }
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::compare()
+     */
+    public function testCompare()
+    {
+        $a = pack('H*', '589a84d7ec2db8f982841cedca674ec1');
+        $b = $a;
+        $b[15] = 'a';
+        $this->assertSame(
+            \Sodium\compare($a, $b),
+            ParagonIE_Sodium_Core_Util::compare($a, $b),
+            bin2hex($a) . ' vs ' . bin2hex($b)
+        );
+
+        $a = random_bytes(16);
+        $b = $a;
+        $b[15] = 'a';
+
+        $this->assertSame(
+            \Sodium\compare($a, $b),
+            ParagonIE_Sodium_Core_Util::compare($a, $b),
+            bin2hex($a)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::bin2hex()
+     */
+    public function testBin2hex()
+    {
+        $str = random_bytes(random_int(1, 63));
+        $this->assertSame(
+            \Sodium\bin2hex($str),
+            ParagonIE_Sodium_Core_Util::bin2hex($str)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::hex2bin()
+     */
+    public function testHex2bin()
+    {
+        $str = bin2hex(random_bytes(random_int(1, 63)));
+        $this->assertSame(
+            \Sodium\hex2bin($str),
+            ParagonIE_Sodium_Core_Util::hex2bin($str)
+        );
+    }
+
+    /**
+     *
+     */
+    public function testCryptoAuth()
+    {
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+        $key = random_bytes(32);
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_auth($message, $key)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_auth($message, $key))
+        );
+        $mac = \Sodium\crypto_auth($message, $key);
+        $this->assertTrue(
+            ParagonIE_Sodium_Compat::crypto_auth_verify($mac, $message, $key)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_box()
+     * @covers ParagonIE_Sodium_Compat::crypto_box_open()
+     */
+    public function testCryptoBox()
+    {
+        $nonce = str_repeat("\x00", 24);
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+
+        $alice_box_kp = \Sodium\crypto_box_keypair();
+        $alice_box_secretkey = \Sodium\crypto_box_secretkey($alice_box_kp);
+        $alice_box_publickey = \Sodium\crypto_box_publickey($alice_box_kp);
+
+        $bob_box_kp = \Sodium\crypto_box_keypair();
+        $bob_box_secretkey = \Sodium\crypto_box_secretkey($bob_box_kp);
+        $bob_box_publickey = \Sodium\crypto_box_publickey($bob_box_kp);
+
+        $alice_to_bob = \Sodium\crypto_box_keypair_from_secretkey_and_publickey(
+            $alice_box_secretkey,
+            $bob_box_publickey
+        );
+        $bob_to_alice = \Sodium\crypto_box_keypair_from_secretkey_and_publickey(
+            $bob_box_secretkey,
+            $alice_box_publickey
+        );
+        $bob_to_alice2 = ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey(
+            $bob_box_secretkey,
+            $alice_box_publickey
+        );
+        $this->assertSame($bob_to_alice, $bob_to_alice2);
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_box($message, $nonce, $alice_to_bob)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_box($message, $nonce, $alice_to_bob)),
+            'box'
+        );
+        $this->assertSame(
+            $message,
+            ParagonIE_Sodium_Compat::crypto_box_open(
+                \Sodium\crypto_box($message, $nonce, $alice_to_bob),
+                $nonce,
+                $bob_to_alice
+            )
+        );
+
+        $message = str_repeat("Lorem ipsum dolor sit amet, consectetur adipiscing elit. ", 8);
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_box($message, $nonce, $alice_to_bob)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_box($message, $nonce, $alice_to_bob)),
+            'crypto_box is failing with large messages'
+        );
+        $this->assertSame(
+            bin2hex($message),
+            bin2hex(
+                ParagonIE_Sodium_Compat::crypto_box_open(
+                    \Sodium\crypto_box($message, $nonce, $alice_to_bob),
+                    $nonce,
+                    $bob_to_alice
+                )
+            )
+        );
+    }
+
+    public function testCryptoBoxSeal()
+    {
+        $msg = ParagonIE_Sodium_Core_Util::hex2bin(
+            '7375f4094f1151640bd853cb13dbc1a0ee9e13b0287a89d34fa2f6732be9de13f88457553d'.
+            '768347116522d6d32c9cb353ef07aa7c83bd129b2bb5db35b28334c935b24f2639405a0604'
+        );
+        $kp = ParagonIE_Sodium_Core_Util::hex2bin(
+            '36a6c2b96a650d80bf7e025e0f58f3d636339575defb370801a54213bd54582d'.
+            '5aecbcf7866e7a4d58a6c1317e2b955f54ecbe2fcbbf7d262c10636ed524480c'
+        );
+        $alice_opened2 = ParagonIE_Sodium_Compat::crypto_box_seal_open($msg, $kp);
+        $this->assertSame(
+            bin2hex('This is for your eyes only'),
+            bin2hex($alice_opened2),
+            'Decryption failed #2'
+        );
+        $alice_box_kp = ParagonIE_Sodium_Core_Util::hex2bin(
+            '15b36cb00213373fb3fb03958fb0cc0012ecaca112fd249d3cf0961e311caac9' .
+            'fb4cb34f74a928b79123333c1e63d991060244cda98affee14c3398c6d315574'
+        );
+        $alice_box_publickey = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fb4cb34f74a928b79123333c1e63d991060244cda98affee14c3398c6d315574'
+        );
+        $anonymous_message_to_alice = \Sodium\crypto_box_seal(
+            'Anonymous message',
+            $alice_box_publickey);
+        $decrypted_message = ParagonIE_Sodium_Compat::crypto_box_seal_open(
+            $anonymous_message_to_alice,
+            $alice_box_kp
+        );
+        $this->assertSame(
+            'Anonymous message',
+            $decrypted_message
+        );
+
+        $messages = array(
+            'test',
+            'slightly longer message',
+            str_repeat('a', 29) . ' 32',
+            str_repeat('a', 30) . ' 33',
+            str_repeat('a', 31) . ' 34',
+            "Lorem ipsum dolor sit amet, consectetur adipiscing elit.",
+        );
+        foreach ($messages as $message) {
+            $sealed_to_alice1 = \Sodium\crypto_box_seal($message, $alice_box_publickey);
+            $sealed_to_alice2 = ParagonIE_Sodium_Compat::crypto_box_seal(
+                $message,
+                $alice_box_publickey
+            );
+
+            $this->assertSame(
+                strlen($sealed_to_alice1),
+                strlen($sealed_to_alice2),
+                'String length should not differ'
+            );
+
+            $alice_opened1 = ParagonIE_Sodium_Compat::crypto_box_seal_open($sealed_to_alice1, $alice_box_kp);
+            $this->assertSame(
+                bin2hex(\Sodium\crypto_box_seal_open($sealed_to_alice1, $alice_box_kp)),
+                bin2hex($message),
+                'Decryption failed #1: ' . $message
+            );
+            $this->assertSame(
+                bin2hex($message),
+                bin2hex($alice_opened1),
+                'Decryption failed #1: ' . $message
+            );
+            $this->assertSame(
+                bin2hex($alice_opened1),
+                bin2hex(\Sodium\crypto_box_seal_open($sealed_to_alice1, $alice_box_kp)),
+                'Decryption failed #1: ' . $message
+            );
+
+            $alice_opened2 = ParagonIE_Sodium_Compat::crypto_box_seal_open(
+                $sealed_to_alice2,
+                $alice_box_kp
+            );
+
+            $this->assertSame(
+                $message,
+                $alice_opened2,
+                'Decryption failed #2: ' . $message
+            );
+            $this->assertSame(
+                bin2hex(\Sodium\crypto_box_seal_open($sealed_to_alice2, $alice_box_kp)),
+                bin2hex($message),
+                'Decryption failed #2: ' . $message
+            );
+            $this->assertSame(
+                bin2hex(\Sodium\crypto_box_seal_open($sealed_to_alice2, $alice_box_kp)),
+                bin2hex($alice_opened2),
+                'Decryption failed #2: ' . $message
+            );
+        }
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::generichash()
+     */
+    public function testCryptoGenerichash()
+    {
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_generichash('apple')),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash('apple')),
+            'BLAKE2b implementation'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_generichash('apple', 'catastrophic failure')),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash('apple', 'catastrophic failure')),
+            'BLAKE2b with a key'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_generichash('apple', '', 64)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash('apple', '', 64)),
+            'BLAKE2b implementation with output length'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_generichash('apple', 'catastrophic failure', 24)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash('apple', 'catastrophic failure', 24)),
+            'BLAKE2b implementation with output length'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::generichash_init()
+     * @covers ParagonIE_Sodium_Crypto::generichash_update()
+     * @covers ParagonIE_Sodium_Crypto::generichash_final()
+     */
+    public function testCryptoGenerichashStream()
+    {
+        $key =  "\x1c" . str_repeat("\x80", 30) . "\xaf";
+        $ctx = \Sodium\crypto_generichash_init($key);
+        $this->assertSame(
+            bin2hex($ctx),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash_init($key)),
+            'BLAKE2b Context Serialization'
+        );
+
+        $subCtx = ParagonIE_Sodium_Core_BLAKE2b::stringToContext($ctx);
+        $this->assertSame(
+            bin2hex($ctx),
+            bin2hex(ParagonIE_Sodium_Core_BLAKE2b::contextToString($subCtx)),
+            'Context serialization / deserialization'
+        );
+        $this->assertEquals(
+            $subCtx,
+            ParagonIE_Sodium_Core_BLAKE2b::stringToContext(
+                ParagonIE_Sodium_Core_BLAKE2b::contextToString($subCtx)
+            ),
+            'Determinism'
+        );
+
+        $nativeCtx = '';
+        for ($i = 0; $i < ParagonIE_Sodium_Core_Util::strlen($ctx); ++$i) {
+            $nativeCtx .= $ctx[$i];
+        }
+
+        \Sodium\crypto_generichash_update($nativeCtx, 'Paragon Initiative');
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, 'Paragon Initiative');
+
+        $this->assertSame(
+            bin2hex($nativeCtx),
+            bin2hex($ctx),
+            'generichash_update() 1'
+        );
+        \Sodium\crypto_generichash_update($nativeCtx, ' Enterprises, LLC');
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, ' Enterprises, LLC');
+
+        $this->assertSame(
+            bin2hex($nativeCtx),
+            bin2hex($ctx),
+            'generichash_update() 2'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_generichash_final($nativeCtx, 32)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, 32)),
+            'generichash_final()'
+        );
+    }
+
+    public function testSignKeypair()
+    {
+        $seed = random_bytes(32);
+        $kp = \Sodium\crypto_sign_seed_keypair($seed);
+        $this->assertSame(
+            bin2hex($kp),
+            bin2hex(
+                ParagonIE_Sodium_Compat::crypto_sign_seed_keypair($seed)
+            ),
+            'crypto_sign_seed_keypair() is invalid.'
+        );
+        $secret = \Sodium\crypto_sign_secretkey($kp);
+        $public = \Sodium\crypto_sign_publickey($kp);
+
+        $pk = '';
+        $sk = '';
+        ParagonIE_Sodium_Core_Ed25519::seed_keypair($pk, $sk, $seed);
+        $this->assertSame(
+            bin2hex($secret),
+            bin2hex($sk),
+            'Seed secret key'
+        );
+        $this->assertSame(
+            bin2hex($public),
+            bin2hex($pk),
+            'Seed public key'
+        );
+        $keypair = ParagonIE_Sodium_Compat::crypto_sign_keypair();
+        $secret = \Sodium\crypto_sign_secretkey($keypair);
+        $public = \Sodium\crypto_sign_publickey($keypair);
+
+        $this->assertSame(
+            bin2hex($public),
+            bin2hex(
+                \Sodium\crypto_sign_publickey_from_secretkey($secret)
+            ),
+            'Conversion from existing secret key is failing. This is a very bad thing!'
+        );
+
+    }
+
+    public function testSignKeypair2()
+    {
+        $keypair = \Sodium\crypto_sign_keypair();
+        $secret = \Sodium\crypto_sign_secretkey($keypair);
+        $public = \Sodium\crypto_sign_publickey($keypair);
+
+        $this->assertSame(
+            bin2hex($public),
+            bin2hex(
+                ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey($secret)
+            ),
+            'Conversion from existing secret key is failing. This is a very bad thing!'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_sign()
+     * @covers ParagonIE_Sodium_Compat::crypto_sign_open()
+     * @covers ParagonIE_Sodium_Compat::crypto_sign_detached()
+     * @covers ParagonIE_Sodium_Compat::crypto_sign_verify_detached()
+     */
+    public function testCryptoSign()
+    {
+        $keypair = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fcdf31aae72e280cc760186d83e41be216fe1f2c7407dd393ad3a45a2fa501a4' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc'
+        );
+        $secret = \Sodium\crypto_sign_secretkey($keypair);
+        $public = \Sodium\crypto_sign_publickey($keypair);
+
+        $this->assertSame(
+            $secret,
+            ParagonIE_Sodium_Compat::crypto_sign_secretkey($keypair),
+            'crypto_sign_secretkey() is broken'
+        );
+        $this->assertSame(
+            $public,
+            ParagonIE_Sodium_Compat::crypto_sign_publickey($keypair),
+            'crypto_sign_publickey() is broken'
+        );
+
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+        $expected =
+        '36a6d2748f6ab8f76c122a562d55343cb7c6f15c8a45bd55bd8b9e9fadd2363f' .
+        '370cb78fba42c550d487b9bd7413312b6490c8b3ee2cea638997172a9c8c250f';
+
+        $this->assertSame(
+            $expected,
+            bin2hex(\Sodium\crypto_sign_detached($message, $secret)),
+            'Generated different signatures'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_sign_detached($message, $secret)),
+            bin2hex(ParagonIE_Sodium_Crypto::sign_detached($message, $secret)),
+            'Generated different signatures'
+        );  
+
+        $this->assertSame(
+            $expected,
+            bin2hex(ParagonIE_Sodium_Crypto::sign_detached($message, $secret)),
+            'Generated different signatures'
+        );
+
+        $message = 'Test message: ' . base64_encode(random_bytes(33));
+        $keypair = \Sodium\crypto_sign_keypair();
+        $secret = \Sodium\crypto_sign_secretkey($keypair);
+        $public = \Sodium\crypto_sign_publickey($keypair);
+        $public2 = ParagonIE_Sodium_Compat::crypto_sign_publickey($keypair);
+        $this->assertSame($public, $public2);
+
+        $signature = \Sodium\crypto_sign_detached($message, $secret);
+        $this->assertSame(
+            bin2hex($signature),
+            bin2hex(ParagonIE_Sodium_Crypto::sign_detached($message, $secret)),
+            'Generated different signatures'
+        );
+        $this->assertTrue(
+            ParagonIE_Sodium_Crypto::sign_verify_detached($signature, $message, $public),
+            'Signature verification failed in compatibility test.'
+        );
+
+        // Signed messages (NaCl compatibility):
+        $signed = \Sodium\crypto_sign($message, $secret);
+        $this->assertSame(
+            bin2hex($signed),
+            bin2hex(ParagonIE_Sodium_Crypto::sign($message, $secret)),
+            'Basic crypto_sign works'
+        );
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_sign_open($signed, $public)),
+            bin2hex(ParagonIE_Sodium_Crypto::sign_open($signed, $public)),
+            'Basic crypto_sign_open works'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_secretbox()
+     */
+    public function testCryptoSecretBox()
+    {
+        $key = str_repeat("\x80", 32);
+        $nonce = str_repeat("\x00", 24);
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+
+        $this->assertSame(
+            substr(
+                bin2hex(\Sodium\crypto_secretbox($message, $nonce, $key)),
+                0, 32
+            ),
+            substr(
+                bin2hex(ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key)),
+                0, 32
+            ),
+            'secretbox - short messages'
+        );
+        $this->assertSame(
+            $message,
+            ParagonIE_Sodium_Crypto::secretbox_open(
+                \Sodium\crypto_secretbox($message, $nonce, $key),
+                $nonce,
+                $key
+            )
+        );
+        $this->assertSame(
+            $message,
+            \Sodium\crypto_secretbox_open(
+                ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key),
+                $nonce,
+                $key
+            )
+        );
+        $message = str_repeat('a', 97);
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_secretbox($message, $nonce, $key)),
+            bin2hex(ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key)),
+            'secretbox - long messages (multiple of 16)'
+        );
+
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+
+        $message = str_repeat($message, 16);
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_secretbox($message, $nonce, $key)),
+            bin2hex(ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key)),
+            'secretbox - long messages (multiple of 16)'
+        );
+
+        $message .= 'a';
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_secretbox($message, $nonce, $key)),
+            bin2hex(ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key)),
+            'secretbox - long messages (NOT a multiple of 16)'
+        );
+
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_secretbox($message, $nonce, $key)),
+            bin2hex(ParagonIE_Sodium_Crypto::secretbox($message, $nonce, $key)),
+            'secretbox - medium messages'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_scalarmult_base()
+     */
+    public function testCryptoScalarmultBase()
+    {
+        $keypair = \Sodium\crypto_box_keypair();
+        $secret = \Sodium\crypto_box_secretkey($keypair);
+        $public = \Sodium\crypto_box_publickey($keypair);
+
+        $this->assertSame(
+            $public,
+            ParagonIE_Sodium_Compat::crypto_scalarmult_base($secret)
+        );
+    }
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_scalarmult()
+     */
+    public function testCryptoScalarmult()
+    {
+        $alice_box_kp = \Sodium\crypto_box_keypair();
+        $alice_box_secretkey = \Sodium\crypto_box_secretkey($alice_box_kp);
+        $alice_box_publickey = \Sodium\crypto_box_publickey($alice_box_kp);
+
+        $bob_box_kp = \Sodium\crypto_box_keypair();
+        $bob_box_secretkey = \Sodium\crypto_box_secretkey($bob_box_kp);
+        $bob_box_publickey = \Sodium\crypto_box_publickey($bob_box_kp);
+
+        $this->assertSame(
+            \Sodium\crypto_scalarmult($alice_box_secretkey, $bob_box_publickey),
+            ParagonIE_Sodium_Compat::crypto_scalarmult($alice_box_secretkey, $bob_box_publickey)
+        );
+
+        $this->assertSame(
+            \Sodium\crypto_scalarmult($bob_box_secretkey, $alice_box_publickey),
+            ParagonIE_Sodium_Compat::crypto_scalarmult($bob_box_secretkey, $alice_box_publickey)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_box_secretkey()
+     * @covers ParagonIE_Sodium_Compat::crypto_box_publickey()
+     */
+    public function testCryptoBoxKeypairs()
+    {
+        $keypair = \Sodium\crypto_box_keypair();
+        $secret = \Sodium\crypto_box_secretkey($keypair);
+        $public = \Sodium\crypto_box_publickey($keypair);
+
+        $this->assertSame(
+            $secret,
+            ParagonIE_Sodium_Compat::crypto_box_secretkey($keypair)
+        );
+        $this->assertSame(
+            $public,
+            ParagonIE_Sodium_Compat::crypto_box_publickey($keypair)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_stream()
+     */
+    public function testCryptoStream()
+    {
+        $key = str_repeat("\x80", 32);
+        $nonce = str_repeat("\x00", 24);
+
+        $streamed = \Sodium\crypto_stream(64, $nonce, $key);
+        $this->assertSame(
+            bin2hex($streamed),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_stream(64, $nonce, $key)),
+            'crypto_stream_xor() is not working'
+        );
+        $key = random_bytes(32);
+        $nonce = random_bytes(24);
+
+        $streamed = \Sodium\crypto_stream(1024, $nonce, $key);
+        $this->assertSame(
+            bin2hex($streamed),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_stream(1024, $nonce, $key)),
+            'crypto_stream() is not working'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_stream_xor()
+     */
+    public function testCryptoStreamXor()
+    {
+        $key = str_repeat("\x80", 32);
+        $nonce = str_repeat("\x00", 24);
+        $message = 'Test message';
+
+        $streamed = \Sodium\crypto_stream_xor($message, $nonce, $key);
+        $this->assertSame(
+            bin2hex($streamed),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_stream_xor($message, $nonce, $key)),
+            'crypto_stream_xor() is not working'
+        );
+
+        $key = random_bytes(32);
+        $nonce = random_bytes(24);
+
+        $message = 'Test message: ' . base64_encode(random_bytes(93));
+
+        $streamed = \Sodium\crypto_stream_xor($message, $nonce, $key);
+        $this->assertSame(
+            bin2hex($streamed),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_stream_xor($message, $nonce, $key)),
+            'crypto_stream_xor() is not working'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_kx()
+     */
+    public function testCryptoKx()
+    {
+        $alice_box_kp = \Sodium\crypto_box_keypair();
+        $alice_box_secretkey = \Sodium\crypto_box_secretkey($alice_box_kp);
+        $alice_box_publickey = \Sodium\crypto_box_publickey($alice_box_kp);
+
+        $bob_box_kp = \Sodium\crypto_box_keypair();
+        $bob_box_publickey = \Sodium\crypto_box_publickey($bob_box_kp);
+
+        // Let's designate Bob as the server.
+
+        $this->assertSame(
+            bin2hex(
+                \Sodium\crypto_kx(
+                    $alice_box_secretkey, $bob_box_publickey,
+                    $alice_box_publickey, $bob_box_publickey
+                )
+            ),
+            bin2hex(
+                ParagonIE_Sodium_Compat::crypto_kx(
+                    $alice_box_secretkey, $bob_box_publickey,
+                    $alice_box_publickey, $bob_box_publickey
+                )
+            )
+        );
+    }
+
+    /**
+     *
+     */
+    public function testCryptoShorthash()
+    {
+        $message = str_repeat("\x00", 8);
+        $key = str_repeat("\x00", 16);
+        $this->shorthashVerify($message, $key);
+
+        $key = str_repeat("\xff", 16);
+        $this->shorthashVerify($message, $key);
+
+        $message = str_repeat("\x01", 8);
+        $this->shorthashVerify($message, $key);
+
+        $message = str_repeat("\x01", 7) . "\x02";
+        $this->shorthashVerify($message, $key);
+
+        $key = str_repeat("\xff", 8) . str_repeat("\x00", 8);
+        $this->shorthashVerify($message, $key);
+
+        $message = str_repeat("\x00", 8);
+        $key = random_bytes(16);
+
+        $this->shorthashVerify($message, $key);
+
+        $message = random_bytes(random_int(1, 100));
+        $this->shorthashVerify($message, $key);
+    }
+    
+    protected function shorthashVerify($m, $k)
+    {
+        $this->assertSame(
+            bin2hex(\Sodium\crypto_shorthash($m, $k)),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_shorthash($m, $k))
+        );
+    }
+}

wp-includes/sodium_compat/tests/unit/UtilTest.php

@@ +1 @@
+<?php
+
+class UtilTest extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::bin2hex()
+     * @covers ParagonIE_Sodium_Core_Util::hex2bin()
+     */
+    public function testBin2hex()
+    {
+        $data = random_bytes(32);
+        $this->assertSame(
+            bin2hex($data),
+            ParagonIE_Sodium_Core_Util::bin2hex($data),
+            'bin2hex should be the compatible with PHP'
+        );
+        $this->assertSame(
+            $data,
+            ParagonIE_Sodium_Core_Util::hex2bin(
+                ParagonIE_Sodium_Core_Util::bin2hex($data)
+            ),
+            'bin2hex and hex2bin should decode a string to itself'
+        );
+        $this->assertSame(
+            $data,
+            ParagonIE_Sodium_Core_Util::hex2bin(
+                bin2hex($data)
+            ),
+            'hex2bin should be compatible with PHP'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::randombytes_buf()
+     * @covers ParagonIE_Sodium_Compat::randombytes_random16()
+     * @covers ParagonIE_Sodium_Compat::randombytes_uniform()
+     */
+    public function testRandombytes()
+    {
+        $random = ParagonIE_Sodium_Compat::randombytes_buf(32);
+        $this->assertSame(32, ParagonIE_Sodium_Core_Util::strlen($random));
+
+        $other = ParagonIE_Sodium_Compat::randombytes_buf(32);
+        $this->assertNotSame($random, $other);
+
+        $int = ParagonIE_Sodium_Compat::randombytes_uniform(1000);
+        $this->assertLessThan(1000, $int, 'Out of bounds (> 1000)');
+        $this->assertGreaterThan(0, $int, 'Out of bounds (< 0)');
+
+        $int = ParagonIE_Sodium_Compat::randombytes_random16();
+        $this->assertLessThan(65536, $int, 'Out of bounds (> 65535)');
+        $this->assertGreaterThan(0, $int, 'Out of bounds (< 0)');
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::intArrayToString()
+     * @covers ParagonIE_Sodium_Core_Util::stringToIntArray()
+     */
+    public function testConversion()
+    {
+        $sample = array(80, 97, 114, 97, 103, 111, 110);
+
+        $this->assertSame(
+            'Paragon',
+            ParagonIE_Sodium_Core_Util::intArrayToString($sample)
+        );
+
+        $this->assertSame(
+            $sample,
+            ParagonIE_Sodium_Core_Util::stringToIntArray('Paragon')
+        );
+
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::load_3()
+     */
+    public function testLoad3()
+    {
+        $this->assertSame(
+            8451279,
+            ParagonIE_Sodium_Core_Curve25519::load_3("\xcf\xf4\x80"),
+            'Unexpected result from load_3'
+        );
+        $this->assertSame(
+            8516815,
+            ParagonIE_Sodium_Core_Curve25519::load_3("\xcf\xf4\x81"),
+            'Verify endianness is correct'
+        );
+        $this->assertSame(
+            8451280,
+            ParagonIE_Sodium_Core_Curve25519::load_3("\xd0\xf4\x80"),
+            'Verify endianness is correct'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::load_3()
+     */
+    public function testLoad4()
+    {
+        $this->assertSame(
+            8451279,
+            ParagonIE_Sodium_Core_Curve25519::load_4("\xcf\xf4\x80\x00"),
+            'Unexpected result from load_4'
+        );
+        $this->assertSame(
+            2163527424,
+            ParagonIE_Sodium_Core_Curve25519::load_4("\x00\xcf\xf4\x80"),
+            'Unexpected result from load_4'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::strlen()
+     */
+    public function testStrlen()
+    {
+        $this->assertSame(4, ParagonIE_Sodium_Core_Util::strlen("\xF0\x9D\x92\xB3"));
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Core_Util::strlen()
+     */
+    public function testSubstr()
+    {
+        $string = \str_repeat("\xF0\x9D\x92\xB3", 4);
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 0, 1), "\xF0");
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 1, 1), "\x9D");
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 2, 1), "\x92");
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 3, 1), "\xB3");
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 0, 2), "\xF0\x9D");
+        $this->assertSame(ParagonIE_Sodium_Core_Util::substr($string, 2, 2), "\x92\xB3");
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Ge/P1p1.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 constructor.
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $x
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $y
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $z
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $t
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $t = null
+    ) {
+        $this->X = $x;
+        $this->Y = $y;
+        $this->Z = $z;
+        $this->T = $t;
+    }
+}

wp-includes/sodium_compat/autoload.php

@@ +1 @@
+<?php
+
+/**
+ * @param string $class
+ * @return bool
+ */
+function sodiumCompatAutoader($class)
+{
+    $namespace = 'ParagonIE_Sodium_';
+    // does the class use the namespace prefix?
+    $len = strlen($namespace);
+    if (strncmp($namespace, $class, $len) !== 0) {
+        // no, move to the next registered autoloader
+        return false;
+    }
+    // get the relative class name
+    $relative_class = substr($class, $len);
+    // replace the namespace prefix with the base directory, replace namespace
+    // separators with directory separators in the relative class name, append
+    // with .php
+    $file = __DIR__ . '/src/' . str_replace('_', '/', $relative_class) . '.php';
+    // if the file exists, require it
+    if (file_exists($file)) {
+        require $file;
+        return true;
+    }
+    return false;
+}
+spl_autoload_register('sodiumCompatAutoader');
+
+if (PHP_VERSION_ID >= 50300) {
+    // Namespaces didn't exist before 5.3.0, so don't even try to use this
+    // unless PHP >= 5.3.0
+    require_once __DIR__ . '/lib/sodium_compat.php';
+}

wp-includes/sodium_compat/src/Core/BLAKE2b.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_BLAKE2b
+ *
+ * Based on the work of Devi Mandiri in devi/salt.
+ */
+abstract class ParagonIE_Sodium_Core_BLAKE2b extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @var SplFixedArray[]
+     */
+    protected static $iv;
+
+    /**
+     * @var int[][]
+     */
+    protected static $sigma = array(
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3),
+        array( 11,  8, 12,  0,  5,  2, 15, 13, 10, 14,  3,  6,  7,  1,  9,  4),
+        array(  7,  9,  3,  1, 13, 12, 11, 14,  2,  6,  5, 10,  4,  0, 15,  8),
+        array(  9,  0,  5,  7,  2,  4, 10, 15, 14,  1, 11, 12,  6,  8,  3, 13),
+        array(  2, 12,  6, 10,  0, 11,  8,  3,  4, 13,  7,  5, 15, 14,  1,  9),
+        array( 12,  5,  1, 15, 14, 13,  4, 10,  0,  7,  6,  3,  9,  2,  8, 11),
+        array( 13, 11,  7, 14, 12,  1,  3,  9,  5,  0, 15,  4,  8,  6,  2, 10),
+        array(  6, 15, 14,  9, 11,  3,  0,  8, 12,  2, 13,  7,  1,  4, 10,  5),
+        array( 10,  2,  8,  4,  7,  6,  1,  5, 15, 11,  9, 14,  3, 12, 13 , 0),
+        array(  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15),
+        array( 14, 10,  4,  8,  9, 15, 13,  6,  1, 12,  0,  2, 11,  7,  5,  3)
+    );
+
+    const BLOCKBYTES = 128;
+    const OUTBYTES   = 64;
+    const KEYBYTES   = 64;
+
+    /**
+     * Turn two 32-bit integers into a fixed array representing a 64-bit integer.
+     *
+     * @param int $high
+     * @param int $low
+     * @return SplFixedArray
+     */
+    protected static function new64($high, $low)
+    {
+        $i64 = new SplFixedArray(2);
+        $i64[0] = $high & 0xffffffff;
+        $i64[1] = $low & 0xffffffff;
+        return $i64;
+    }
+
+    /**
+     * Convert an arbitrary number into an SplFixedArray of two 32-bit integers
+     * that represents a 64-bit integer.
+     *
+     * @param int $num
+     * @return SplFixedArray
+     */
+    protected static function to64($num)
+    {
+        $hi = 0; $lo = $num & 0xffffffff;
+
+        if ((+(abs($num))) >= 1) {
+            if ($num > 0) {
+                $hi = min((+(floor($num/4294967296))), 4294967295);
+            } else {
+                $hi = ~~((+(ceil(($num - (+((~~($num)))))/4294967296))));
+            }
+        }
+
+        return self::new64($hi, $lo);
+    }
+
+    /**
+     * Adds two 64-bit integers together, returning their sum as a SplFixedArray
+     * containing two 32-bit integers (representing a 64-bit integer).
+     *
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @return SplFixedArray
+     */
+    protected static function add64($x, $y)
+    {
+        $l = ($x[1] + $y[1]) & 0xffffffff;
+        return self::new64($x[0] + $y[0] + (($l < $x[1]) ? 1 : 0), $l);
+    }
+
+    /**
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @param SplFixedArray $z
+     * @return SplFixedArray
+     */
+    protected static function add364($x, $y, $z)
+    {
+        return self::add64($x, self::add64($y, $z));
+    }
+
+    /**
+     * @param SplFixedArray $x
+     * @param SplFixedArray $y
+     * @return SplFixedArray
+     * @throws Exception
+     */
+    protected static function xor64(SplFixedArray $x, SplFixedArray $y)
+    {
+        if (!is_numeric($x[0])) {
+            throw new Exception('x[0] is not an integer');
+        }
+        if (!is_numeric($x[1])) {
+            throw new Exception('x[1] is not an integer');
+        }
+        if (!is_numeric($y[0])) {
+            throw new Exception('y[0] is not an integer');
+        }
+        if (!is_numeric($y[1])) {
+            throw new Exception('y[1] is not an integer');
+        }
+        return self::new64($x[0] ^ $y[0], $x[1] ^ $y[1]);
+    }
+
+    /**
+     * @param SplFixedArray $x
+     * @param int $c
+     * @return SplFixedArray
+     */
+    protected static function rotr64($x, $c)
+    {
+        $l0 = 0;
+        $c = 64 - $c;
+
+        if ($c < 32) {
+            $h0 = ($x[0] << $c) | (($x[1] & ((1 << $c) - 1) << (32 - $c)) >> (32 - $c));
+            $l0 = $x[1] << $c;
+        } else {
+            $h0 = $x[1] << ($c - 32);
+        }
+
+        $h1 = 0;
+        $c1 = 64 - $c;
+
+        if ($c1 < 32) {
+            $h1 = $x[0] >> $c1;
+            $l1 = ($x[1] >> $c1) | ($x[0] & ((1 << $c1) - 1)) << (32 - $c1);
+        } else {
+            $l1 = $x[0] >> ($c1 - 32);
+        }
+
+        return self::new64($h0 | $h1, $l0 | $l1);
+    }
+
+    /**
+     * @param SplFixedArray $x
+     * @return int
+     */
+    protected static function flatten64($x)
+    {
+        return ($x[0] * 4294967296 + $x[1]);
+    }
+
+    /**
+     * @param $x
+     * @param $i
+     * @return SplFixedArray
+     */
+    protected static function load64($x, $i)
+    {
+        $l = $x[$i]   | ($x[$i+1]<<8) | ($x[$i+2]<<16) | ($x[$i+3]<<24);
+        $h = $x[$i+4] | ($x[$i+5]<<8) | ($x[$i+6]<<16) | ($x[$i+7]<<24);
+        return self::new64($h, $l);
+    }
+
+    /**
+     * @param $x
+     * @param $i
+     * @param $u
+     */
+    protected static function store64($x, $i, $u)
+    {
+        $x[$i]   = ($u[1] & 0xff); $u[1] >>= 8;
+        $x[$i+1] = ($u[1] & 0xff); $u[1] >>= 8;
+        $x[$i+2] = ($u[1] & 0xff); $u[1] >>= 8;
+        $x[$i+3] = ($u[1] & 0xff);
+        $x[$i+4] = ($u[0] & 0xff); $u[0] >>= 8;
+        $x[$i+5] = ($u[0] & 0xff); $u[0] >>= 8;
+        $x[$i+6] = ($u[0] & 0xff); $u[0] >>= 8;
+        $x[$i+7] = ($u[0] & 0xff);
+    }
+
+    /**
+     * This just sets the $iv static variable.
+     */
+    public static function pseudoConstructor()
+    {
+        static $called = false;
+        if ($called) {
+            return;
+        }
+        self::$iv = new SplFixedArray(8);
+        self::$iv[0] = self::new64(0x6a09e667, 0xf3bcc908);
+        self::$iv[1] = self::new64(0xbb67ae85, 0x84caa73b);
+        self::$iv[2] = self::new64(0x3c6ef372, 0xfe94f82b);
+        self::$iv[3] = self::new64(0xa54ff53a, 0x5f1d36f1);
+        self::$iv[4] = self::new64(0x510e527f, 0xade682d1);
+        self::$iv[5] = self::new64(0x9b05688c, 0x2b3e6c1f);
+        self::$iv[6] = self::new64(0x1f83d9ab, 0xfb41bd6b);
+        self::$iv[7] = self::new64(0x5be0cd19, 0x137e2179);
+
+        $called = true;
+    }
+
+    /**
+     * Returns a fresh BLAKE2 context.
+     *
+     * @return SplFixedArray
+     */
+    protected static function context()
+    {
+        $ctx    = new SplFixedArray(5);
+        $ctx[0] = new SplFixedArray(8);   // h
+        $ctx[1] = new SplFixedArray(2);   // t 
+        $ctx[2] = new SplFixedArray(2);   // f
+        $ctx[3] = new SplFixedArray(256); // buf
+        $ctx[4] = 0;                      // buflen
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::$iv[$i];
+        }
+        for ($i = 256; $i--;) {
+            $ctx[3][$i] = 0;
+        }
+
+        $zero = self::new64(0, 0);
+        $ctx[1][0] = $zero;
+        $ctx[1][1] = $zero;
+        $ctx[2][0] = $zero;
+        $ctx[2][1] = $zero;
+
+        return $ctx;
+    }
+
+    /**
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $buf
+     */
+    protected static function compress(SplFixedArray $ctx, SplFixedArray $buf)
+    {
+        $m = new SplFixedArray(16);
+        $v = new SplFixedArray(16);
+
+        for ($i = 16; $i--;) {
+            $m[$i] = self::load64($buf, $i*8);
+        }
+
+        for ($i = 8; $i--;) {
+            $v[$i] = $ctx[0][$i];
+        }
+
+        $v[ 8] = self::$iv[0];
+        $v[ 9] = self::$iv[1];
+        $v[10] = self::$iv[2];
+        $v[11] = self::$iv[3];
+
+        $v[12] = self::xor64($ctx[1][0], self::$iv[4]);
+        $v[13] = self::xor64($ctx[1][1], self::$iv[5]);
+        $v[14] = self::xor64($ctx[2][0], self::$iv[6]);
+        $v[15] = self::xor64($ctx[2][1], self::$iv[7]);
+
+        for ($r = 0; $r < 12; ++$r) {
+            $v = self::G($r, 0,  0,  4,  8, 12, $v, $m);
+            $v = self::G($r, 1,  1,  5,  9, 13, $v, $m);
+            $v = self::G($r, 2,  2,  6, 10, 14, $v, $m);
+            $v = self::G($r, 3,  3,  7, 11, 15, $v, $m);
+            $v = self::G($r, 4,  0,  5, 10, 15, $v, $m);
+            $v = self::G($r, 5,  1,  6, 11, 12, $v, $m);
+            $v = self::G($r, 6,  2,  7,  8, 13, $v, $m);
+            $v = self::G($r, 7,  3,  4,  9, 14, $v, $m);
+        }
+
+        for ($i = 8; $i--;) {
+            $ctx[0][$i] = self::xor64(
+                $ctx[0][$i], self::xor64($v[$i], $v[$i+8])
+            );
+        }
+    }
+
+    /**
+     * @param int $r
+     * @param int $i
+     * @param int $a
+     * @param int $b
+     * @param int $c
+     * @param int $d
+     * @param SplFixedArray $v
+     * @param SplFixedArray $m
+     * @return SplFixedArray
+     */
+    public static function G($r, $i, $a, $b, $c, $d, SplFixedArray $v, SplFixedArray $m)
+    {
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][2*$i]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 32);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 24);
+        $v[$a] = self::add364($v[$a], $v[$b], $m[self::$sigma[$r][2*$i+1]]);
+        $v[$d] = self::rotr64(self::xor64($v[$d], $v[$a]), 16);
+        $v[$c] = self::add64($v[$c], $v[$d]);
+        $v[$b] = self::rotr64(self::xor64($v[$b], $v[$c]), 63);
+        return $v;
+    }
+
+    /**
+     * @param SplFixedArray $ctx
+     * @param int $inc
+     */
+    protected static function increment_counter($ctx, $inc)
+    {
+        $t = self::to64($inc);
+        $ctx[1][0] = self::add64($ctx[1][0], $t);
+        if (self::flatten64($ctx[1][0]) < $inc) {
+            $ctx[1][1] = self::add64($ctx[1][1], self::to64(1));
+        }
+    }
+
+    /**
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $p
+     * @param int $plen
+     */
+    public static function update(SplFixedArray $ctx, $p, $plen)
+    {
+        $offset = 0;
+        while ($plen > 0) {
+            $left = $ctx[4];
+            $fill = 256 - $left;
+
+            if ($plen > $fill) {
+                for ($i = $fill; $i--;) {
+                    $ctx[3][$i+$left] = $p[$i+$offset];
+                }
+
+                $ctx[4] += $fill;
+
+                self::increment_counter($ctx, 128);
+                self::compress($ctx, $ctx[3]);
+
+                for ($i = 128; $i--;) {
+                    $ctx[3][$i] = $ctx[3][$i+128];
+                }
+
+                $ctx[4] -= 128;
+                $offset += $fill;
+                $plen -= $fill;
+            } else {
+                for ($i = $plen; $i--;) {
+                    $ctx[3][$i+$left] = $p[$i+$offset];
+                }
+                $ctx[4] += $plen;
+                $offset += $plen;
+                $plen -= $plen;
+            }
+        }
+    }
+
+    /**
+     * @param SplFixedArray $ctx
+     * @param SplFixedArray $out
+     * @return SplFixedArray
+     */
+    public static function finish(SplFixedArray $ctx, SplFixedArray $out)
+    {
+        if ($ctx[4] > 128) {
+            self::increment_counter($ctx, 128);
+            self::compress($ctx, $ctx[3]);
+            $ctx[4] -= 128;
+            for ($i = $ctx[4]; $i--;) {
+                $ctx[3][$i] = $ctx[3][$i+128];
+            }
+        }
+
+        self::increment_counter($ctx, $ctx[4]);
+        $ctx[2][0] = self::new64(0xffffffff, 0xffffffff);
+
+        for ($i = 256 - $ctx[4]; $i--;) {
+            $ctx[3][$i+$ctx[4]] = 0;
+        }
+
+        self::compress($ctx, $ctx[3]);
+
+        $i = (int) (($out->getSize() - 1) / 8);
+        for (; $i >= 0; --$i) {
+            self::store64($out, $i * 8, $ctx[0][$i]);
+        }
+        return $out;
+    }
+
+    /**
+     * @param SplFixedArray|null $key
+     * @param int $outlen
+     * @return SplFixedArray
+     * @throws Exception
+     */
+    public static function init($key = null, $outlen = 64)
+    {
+        $klen = 0;
+
+        if ($key !== null) {
+            if (count($key) > 64) {
+                throw new Exception('Invalid key size');
+            }
+            $klen = count($key);
+        }
+
+        if ($outlen > 64) {
+            throw new Exception('Invalid output size');
+        }
+
+        $ctx = self::context();
+
+        $p = new SplFixedArray(64);
+        for ($i = 64; --$i;) $p[$i] = 0;
+
+        $p[0] = $outlen; // digest_length
+        $p[1] = $klen;   // key_length
+        $p[2] = 1;       // fanout
+        $p[3] = 1;       // depth
+
+        $ctx[0][0] = self::xor64(
+            $ctx[0][0],
+            self::load64($p, 0)
+        );
+
+        if ($klen > 0) {
+            $block = new SplFixedArray(128);
+            for ($i = 128; $i--;) {
+                $block[$i] = 0;
+            }
+            for ($i = $klen; $i--;) {
+                $block[$i] = $key[$i];
+            }
+            self::update($ctx, $block, 128);
+        }
+
+        return $ctx;
+    }
+
+    /**
+     * Convert a string into an SplFixedArray of integers
+     *
+     * @param string $str
+     * @return SplFixedArray
+     */
+    public static function stringToSplFixedArray($str = '')
+    {
+        $values = unpack('C*', $str);
+        return SplFixedArray::fromArray(array_values($values));
+    }
+
+    /**
+     * Convert an SplFixedArray of integers into a string
+     *
+     * @param SplFixedArray $a
+     * @return string
+     */
+    public static function SplFixedArrayToString(SplFixedArray $a)
+    {
+        $arr = $a->toArray();
+        $c = $a->count();
+        array_unshift($arr, str_repeat('C', $c));
+        return call_user_func_array('pack', $arr);
+    }
+
+    /**
+     * @param SplFixedArray[SplFixedArray] $ctx
+     * @return string
+     */
+    public static function contextToString(SplFixedArray $ctx)
+    {
+        $str = '';
+        $ctxA = $ctx[0]->toArray();
+        for ($i = 0; $i < 8; ++$i) {
+            $str .= self::store32_le($ctxA[$i][1]);
+            $str .= self::store32_le($ctxA[$i][0]);
+        }
+        for ($i = 0; $i < 2; ++$i) {
+            $ctxA = $ctx[$i + 1]->toArray();
+            $str .= self::store32_le($ctxA[0][1]);
+            $str .= self::store32_le($ctxA[0][0]);
+            $str .= self::store32_le($ctxA[1][1]);
+            $str .= self::store32_le($ctxA[1][0]);
+        }
+        $str .= self::SplFixedArrayToString($ctx[3]);
+        $str .= implode('', array(
+            self::intToChr($ctx[4] & 0xff),
+            self::intToChr(($ctx[4] << 8) & 0xff),
+            self::intToChr(($ctx[4] << 16) & 0xff),
+            self::intToChr(($ctx[4] << 24) & 0xff),
+            self::intToChr(($ctx[4] << 32) & 0xff),
+            self::intToChr(($ctx[4] << 40) & 0xff),
+            self::intToChr(($ctx[4] << 48) & 0xff),
+            self::intToChr(($ctx[4] << 56) & 0xff)
+        ));
+        return $str . "\x00";
+    }
+
+    /**
+     * Creates an SplFixedArray containing other SplFixedArray elements, from
+     * a string (compatible with \Sodium\crypto_generichash_{init, update, final})
+     *
+     * @param $string
+     * @return SplFixedArray
+     */
+    public static function stringToContext($string)
+    {
+        $ctx = self::context();
+        for ($i = 0; $i < 8; ++$i) {
+            $ctx[0][$i] = SplFixedArray::fromArray(
+                array(
+                    self::load_4(
+                        self::substr($string, (8 * $i + 4), 4)
+                    ),
+                    self::load_4(
+                        self::substr($string, (8 * $i + 0), 4)
+                    )
+                )
+            );
+        }
+        for ($i = 1; $i <= 2; ++$i) {
+            $ctx[$i][0] = SplFixedArray::fromArray(
+                array(
+                    self::load_4(self::substr($string, 64 + (8 * $i), 4)),
+                    self::load_4(self::substr($string, 60 + (8 * $i), 4))
+                )
+            );
+        }
+        $ctx[3] = self::stringToSplFixedArray(self::substr($string, 96, 256));
+        $int = 0;
+        for ($i = 0; $i < 8; ++$i) {
+            $int |= self::chrToInt($string[352 + $i]) << (8 * $i);
+        }
+        $ctx[4] = $int;
+        return $ctx;
+    }
+}

wp-includes/sodium_compat/src/Core/Ed25519.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Ed25519
+ */
+abstract class ParagonIE_Sodium_Core_Ed25519 extends ParagonIE_Sodium_Core_Curve25519
+{
+    const KEYPAIR_BYTES = 96;
+    const SEED_BYTES = 32;
+
+    /**
+     * @return string (96 bytes)
+     */
+    public static function keypair()
+    {
+        $seed = random_bytes(self::SEED_BYTES);
+        $pk = '';
+        $sk = '';
+        self::seed_keypair($pk, $sk, $seed);
+        return $sk . $pk;
+    }
+
+    /**
+     * @param string $pk
+     * @param string $sk
+     * @param string $seed
+     */
+    public static function seed_keypair(&$pk, &$sk, $seed)
+    {
+        if (self::strlen($seed) !== self::SEED_BYTES) {
+            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
+        }
+        $pk = self::publickey_from_secretkey($seed);
+        $sk = self::substr($seed, 0, self::SEED_BYTES) . $pk;
+    }
+
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    public static function secretkey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
+        }
+        return self::substr($keypair, 0, 64);
+    }
+
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    public static function publickey($keypair)
+    {
+        if (self::strlen($keypair) !== self::KEYPAIR_BYTES) {
+            throw new RangeException('crypto_sign keypair seed must be 32 bytes long');
+        }
+        return self::substr($keypair, 64, 32);
+    }
+
+    /**
+     * @param $sk
+     * @return string
+     */
+    public static function publickey_from_secretkey($sk)
+    {
+        $sk = hash('sha512', self::substr($sk, 0, 32), true);
+        $sk[0] = self::intToChr(
+            self::chrToInt($sk[0]) & 248
+        );
+        $sk[31] = self::intToChr(
+            (self::chrToInt($sk[31]) & 63) | 64
+        );
+        return self::sk_to_pk($sk);
+    }
+
+    /**
+     * @param $sk
+     * @return string
+     */
+    public static function sk_to_pk($sk)
+    {
+        return self::ge_p3_tobytes(
+            self::ge_scalarmult_base(self::substr($sk, 0, 32))
+        );
+    }
+
+    /**
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    public static function sign($message, $sk)
+    {
+        $signature = self::sign_detached($message, $sk);
+        return $signature . $message;
+    }
+
+    /**
+     * @param string $message
+     * @param string $pk
+     * @return string
+     * @throws Exception
+     */
+    public static function sign_open($message, $pk)
+    {
+        $signature = self::substr($message, 0, 64);
+        $message = self::substr($message, 64);
+        if (self::verify_detached($signature, $message, $pk)) {
+            return $message;
+        }
+        throw new Exception('Invalid signature');
+    }
+
+    /**
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    public static function sign_detached($message, $sk)
+    {
+        # crypto_hash_sha512(az, sk, 32);
+        $az =  hash('sha512', self::substr($sk, 0, 32), true);
+
+        # az[0] &= 248;
+        # az[31] &= 63;
+        # az[31] |= 64;
+        $az[0] = self::intToChr(self::chrToInt($az[0]) & 248);
+        $az[31] = self::intToChr((self::chrToInt($az[31]) & 63) | 64);
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, az + 32, 32);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, nonce);
+        $hs = hash_init('sha512');
+        hash_update($hs, self::substr($az, 32, 32));
+        hash_update($hs, $message);
+        $nonceHash = hash_final($hs, true);
+
+        # memmove(sig + 32, sk + 32, 32);
+        $pk = self::substr($sk, 32, 32);
+
+        # sc_reduce(nonce);
+        # ge_scalarmult_base(&R, nonce);
+        # ge_p3_tobytes(sig, &R);
+        $nonce = self::sc_reduce($nonceHash) . self::substr($nonceHash, 32);
+        $sig = self::ge_p3_tobytes(
+            self::ge_scalarmult_base($nonce)
+        );
+
+        # crypto_hash_sha512_init(&hs);
+        # crypto_hash_sha512_update(&hs, sig, 64);
+        # crypto_hash_sha512_update(&hs, m, mlen);
+        # crypto_hash_sha512_final(&hs, hram);
+        $hs = hash_init('sha512');
+        hash_update($hs, $sig);
+        hash_update($hs, $pk);
+        hash_update($hs, $message);
+        $hramHash = hash_final($hs, true);
+
+        # sc_reduce(hram);
+        # sc_muladd(sig + 32, hram, az, nonce);
+        $hram = self::sc_reduce($hramHash);
+        $sigAfter = self::sc_muladd($hram, $az, $nonce);
+        $sig = self::substr($sig, 0, 32) . self::substr($sigAfter, 0, 32);
+
+        ParagonIE_Sodium_Compat::memzero($az);
+        return $sig;
+    }
+
+    /**
+     * @param string $sig
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws Exception
+     */
+    public static function verify_detached($sig, $message, $pk)
+    {
+        if (self::strlen($sig) < 64) {
+            throw new Exception('Signature is too short');
+        }
+        if (self::check_S_lt_L(self::substr($sig, 32, 32))) {
+            throw new Exception('S < L - Invalid signature');
+        }
+        if (self::small_order($sig)) {
+            throw new Exception('Signature is on too small of an order');
+        }
+        if ((self::chrToInt($sig[63]) & 224) !== 0) {
+            throw new Exception('Invalid signature');
+        }
+
+        $A = self::ge_frombytes_negate_vartime($pk);
+        $d = 0;
+        for ($i = 0; $i < 32; ++$i) {
+            $d |= self::chrToInt($pk[$i]);
+        }
+        if ($d === 0) {
+            throw new \Exception('All zero public key');
+        }
+
+        $hDigest = hash('sha512', self::substr($sig, 0, 32) . $pk . $message, true);
+        $h = self::sc_reduce($hDigest) . self::substr($hDigest, 32);
+        $R = self::ge_double_scalarmult_vartime(
+            $h,
+            $A,
+            self::substr($sig, 32)
+        );
+        $rcheck = self::ge_tobytes($R);
+        return self::verify_32($rcheck, self::substr($sig, 0, 32));
+    }
+
+    /**
+     * @param string $S
+     * @return bool
+     * @throws Exception
+     */
+    public static function check_S_lt_L($S)
+    {
+        if (self::strlen($S) < 32) {
+            throw new Exception('Signature must be 32 bytes');
+        }
+        static $L = array(
+            0xed, 0xd3, 0xf5, 0x5c, 0x1a, 0x63, 0x12, 0x58,
+            0xd6, 0x9c, 0xf7, 0xa2, 0xde, 0xf9, 0xde, 0x14,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x10
+        );
+        $c = 0;
+        $n = 1;
+        $i = 32;
+
+        do {
+            --$i;
+            $x = self::chrToInt($S[$i]);
+            $c |= (
+                (($x - $L[$i]) >> 8) & $n
+            );
+            $n &= (
+                (($x ^ $L[$i]) - 1) >> 8
+            );
+        } while ($i !== 0);
+
+        return $c === 0;
+    }
+
+    /**
+     * @param string $R
+     * @return bool
+     */
+    public static function small_order($R)
+    {
+        static $blacklist = array(
+            /* 0 (order 4) */
+            array(
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 1 (order 1) */
+            array(
+                0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+                0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
+            ),
+            /* 2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0x26, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x05
+            ),
+            /* 55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xc7, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0x7a
+            ),
+            /* p-1 (order 2) */
+            array(
+                0x13, 0xe8, 0x95, 0x8f, 0xc2, 0xb2, 0x27, 0xb0,
+                0x45, 0xc3, 0xf4, 0x89, 0xf2, 0xef, 0x98, 0xf0,
+                0xd5, 0xdf, 0xac, 0x05, 0xd3, 0xc6, 0x33, 0x39,
+                0xb1, 0x38, 0x02, 0x88, 0x6d, 0x53, 0xfc, 0x85
+            ),
+            /* p (order 4) */
+            array(
+                0xb4, 0x17, 0x6a, 0x70, 0x3d, 0x4d, 0xd8, 0x4f,
+                0xba, 0x3c, 0x0b, 0x76, 0x0d, 0x10, 0x67, 0x0f,
+                0x2a, 0x20, 0x53, 0xfa, 0x2c, 0x39, 0xcc, 0xc6,
+                0x4e, 0xc7, 0xfd, 0x77, 0x92, 0xac, 0x03, 0xfa
+            ),
+            /* p+1 (order 1) */
+            array(
+                0xec, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+2707385501144840649318225287225658788936804267575313519463743609750303402022 (order 8) */
+            array(
+                0xed, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* p+55188659117513257062467267217118295137698188065244968500265048394206261417927 (order 8) */
+            array(
+                0xee, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x7f
+            ),
+            /* 2p-1 (order 2) */
+            array(
+                0xd9, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p (order 4) */
+            array(
+                0xda, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            ),
+            /* 2p+1 (order 1) */
+            array(
+                0xdb, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff,
+                0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
+            )
+        );
+        $countBlacklist = count($blacklist);
+
+        for ($i = 0; $i < $countBlacklist; ++$i) {
+            $c = 0;
+            for ($j = 0; $j < 32; ++$j) {
+                $c |= self::chrToInt($R[$j]) ^ $blacklist[$i][$j];
+            }
+            if ($c === 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Ge/Precomp.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $yplusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $yminusx;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $xy2d;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_Precomp constructor.
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yplusx
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $yminusx
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $xy2d
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $yplusx = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $yminusx = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $xy2d = null
+    ) {
+        $this->yplusx = $yplusx;
+        $this->yminusx = $yminusx;
+        $this->xy2d = $xy2d;
+    }
+
+}
+ No newline at end of file

wp-includes/sodium_compat/src/Core/SipHash.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_SodiumCompat_Core_SipHash
+ */
+class ParagonIE_Sodium_Core_SipHash extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * @param int[] $v
+     * @return int[]
+     */
+    public static function sipRound(array $v)
+    {
+        # v0 += v1;
+        list($v[0], $v[1]) = self::add(
+            array($v[0], $v[1]),
+            array($v[2], $v[3])
+        );
+
+        #  v1=ROTL(v1,13);
+        list($v[2], $v[3]) = self::rotl_64($v[2], $v[3], 13);
+
+        #  v1 ^= v0;
+        $v[2] ^= $v[0];
+        $v[3] ^= $v[1];
+
+        #  v0=ROTL(v0,32);
+        list($v[0], $v[1]) = self::rotl_64($v[0], $v[1], 32);
+
+        # v2 += v3;
+        list($v[4], $v[5]) = self::add(
+            array($v[4], $v[5]),
+            array($v[6], $v[7])
+        );
+
+        # v3=ROTL(v3,16);
+        list($v[6], $v[7]) = self::rotl_64($v[6], $v[7], 16);
+
+        #  v3 ^= v2;
+        $v[6] ^= $v[4];
+        $v[7] ^= $v[5];
+
+        # v0 += v3;
+        list($v[0], $v[1]) = self::add(
+            array($v[0], $v[1]),
+            array($v[6], $v[7])
+        );
+
+        # v3=ROTL(v3,21);
+        list($v[6], $v[7]) = self::rotl_64($v[6], $v[7], 21);
+
+        # v3 ^= v0;
+        $v[6] ^= $v[0];
+        $v[7] ^= $v[1];
+
+        # v2 += v1;
+        list($v[4], $v[5]) = self::add(
+            array($v[4], $v[5]),
+            array($v[2], $v[3])
+        );
+
+        # v1=ROTL(v1,17);
+        list($v[2], $v[3]) = self::rotl_64($v[2], $v[3], 17);
+
+        #  v1 ^= v2;;
+        $v[2] ^= $v[4];
+        $v[3] ^= $v[5];
+
+        # v2=ROTL(v2,32)
+        list($v[4], $v[5]) = self::rotl_64($v[4], $v[5], 32);
+
+        return $v;
+    }
+
+    /**
+     * Add two 32 bit integers representing a 64-bit integer.
+     *
+     * @param int[] $a
+     * @param int[] $b
+     * @return int[]
+     */
+    public static function add(array $a, array $b)
+    {
+        $x1 = $a[1] + $b[1];
+        $c = $x1 >> 32; // Carry if ($a + $b) > 0xffffffff
+        $x0 = $a[0] + $b[0] + $c;
+        return array(
+            $x0 & 0xffffffff,
+            $x1 & 0xffffffff
+        );
+    }
+
+    /**
+     * @param int $int0
+     * @param int $int1
+     * @param int $c
+     * @return int[]
+     */
+    public static function rotl_64($int0, $int1, $c)
+    {
+        $int0 &= 0xffffffff;
+        $int1 &= 0xffffffff;
+        $c &= 63;
+        if ($c === 32) {
+            return array($int1, $int0);
+        }
+        if ($c > 31) {
+            $tmp = $int1;
+            $int1 = $int0;
+            $int0 = $tmp;
+            $c &= 31;
+        }
+        if ($c === 0) {
+            return array($int0, $int1);
+        }
+        return array(
+            0xffffffff & (
+                ($int0 << $c)
+                    |
+                ($int1 >> (32 - $c))
+            ),
+            0xffffffff & (
+                ($int1 << $c)
+                    |
+                ($int0 >> (32 - $c))
+            ),
+        );
+    }
+
+    /**
+     * Implements Siphash-2-4 using only 32-bit numbers.
+     *
+     * When we split an int into two, the higher bits go to the lower index.
+     * e.g. 0xDEADBEEFAB10C92D becomes [
+     *     0 => 0xDEADBEEF,
+     *     1 => 0xAB10C92D
+     * ].
+     *
+     * @param string $in
+     * @param string $key
+     * @return string
+     */
+    public static function sipHash24($in, $key)
+    {
+        $inlen = self::strlen($in);
+
+        # /* "somepseudorandomlygeneratedbytes" */
+        # u64 v0 = 0x736f6d6570736575ULL;
+        # u64 v1 = 0x646f72616e646f6dULL;
+        # u64 v2 = 0x6c7967656e657261ULL;
+        # u64 v3 = 0x7465646279746573ULL;
+        $v = array(
+            0x736f6d65, // 0
+            0x70736575, // 1
+            0x646f7261, // 2
+            0x6e646f6d, // 3
+            0x6c796765, // 4
+            0x6e657261, // 5
+            0x74656462, // 6
+            0x79746573  // 7
+        );
+        // v0 => $v[0], $v[1]
+        // v1 => $v[2], $v[3]
+        // v2 => $v[4], $v[5]
+        // v3 => $v[6], $v[7]
+
+        # u64 k0 = LOAD64_LE( k );
+        # u64 k1 = LOAD64_LE( k + 8 );
+        $k = array(
+            self::load_4(self::substr($key, 4, 4)),
+            self::load_4(self::substr($key, 0, 4)),
+            self::load_4(self::substr($key, 12, 4)),
+            self::load_4(self::substr($key, 8, 4))
+        );
+        // k0 => $k[0], $k[1]
+        // k1 => $k[2], $k[3]
+
+        # b = ( ( u64 )inlen ) << 56;
+        $b = array(
+            $inlen << 24,
+            0
+        );
+        // See docblock for why the 0th index gets the higher bits.
+
+        # v3 ^= k1;
+        $v[6] ^= $k[2];
+        $v[7] ^= $k[3];
+        # v2 ^= k0;
+        $v[4] ^= $k[0];
+        $v[5] ^= $k[1];
+        # v1 ^= k1;
+        $v[2] ^= $k[2];
+        $v[3] ^= $k[3];
+        # v0 ^= k0;
+        $v[0] ^= $k[0];
+        $v[1] ^= $k[1];
+
+        $left = $inlen;
+        # for ( ; in != end; in += 8 )
+        while ($left >= 8) {
+            # m = LOAD64_LE( in );
+            $m = array(
+                self::load_4(self::substr($in, 4, 4)),
+                self::load_4(self::substr($in, 0, 4))
+            );
+
+            # v3 ^= m;
+            $v[6] ^= $m[0];
+            $v[7] ^= $m[1];
+
+            # SIPROUND;
+            # SIPROUND;
+            $v = self::sipRound($v);
+            $v = self::sipRound($v);
+
+            # v0 ^= m;
+            $v[0] ^= $m[0];
+            $v[1] ^= $m[1];
+
+            $in = self::substr($in, 8);
+            $left -= 8;
+        }
+
+        # switch( left )
+        #  {
+        #     case 7: b |= ( ( u64 )in[ 6] )  << 48;
+        #     case 6: b |= ( ( u64 )in[ 5] )  << 40;
+        #     case 5: b |= ( ( u64 )in[ 4] )  << 32;
+        #     case 4: b |= ( ( u64 )in[ 3] )  << 24;
+        #     case 3: b |= ( ( u64 )in[ 2] )  << 16;
+        #     case 2: b |= ( ( u64 )in[ 1] )  <<  8;
+        #     case 1: b |= ( ( u64 )in[ 0] ); break;
+        #     case 0: break;
+        # }
+        switch ($left) {
+            case 7:
+                $b[0] |= self::chrToInt($in[6]) << 16;
+            case 6:
+                $b[0] |= self::chrToInt($in[5]) << 8;
+            case 5:
+                $b[0] |= self::chrToInt($in[4]);
+            case 4:
+                $b[1] |= self::chrToInt($in[3]) << 24;
+            case 3:
+                $b[1] |= self::chrToInt($in[2]) << 16;
+            case 2:
+                $b[1] |= self::chrToInt($in[1]) << 8;
+            case 1:
+                $b[1] |= self::chrToInt($in[0]);
+            case 0:
+                break;
+        }
+        // See docblock for why the 0th index gets the higher bits.
+
+        # v3 ^= b;
+        $v[6] ^= $b[0];
+        $v[7] ^= $b[1];
+
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # v0 ^= b;
+        $v[0] ^= $b[0];
+        $v[1] ^= $b[1];
+
+        // Flip the lower 8 bits of v2 which is ($v[4], $v[5]) in our implementation
+        # v2 ^= 0xff;
+        $v[5] ^= 0xff;
+
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        # SIPROUND;
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+        $v = self::sipRound($v);
+
+        # b = v0 ^ v1 ^ v2 ^ v3;
+        # STORE64_LE( out, b );
+        return  self::store32_le($v[1] ^ $v[3] ^ $v[5] ^ $v[7]) .
+            self::store32_le($v[0] ^ $v[2] ^ $v[4] ^ $v[6]);
+    }
+}

wp-includes/compat.php

@@ -435 +435 @@
         require ABSPATH . WPINC . '/random_compat/random.php';
 }
 
+// libsodium - modern cryptography
+if ( ! extension_loaded( 'libsodium' ) ) {
+    require ABSPATH . WPINC . '/sodium_compat/autoload.php';
+}
+
 if ( ! function_exists( 'array_replace_recursive' ) ) :
         /**
          * PHP-agnostic version of {@link array_replace_recursive()}.

wp-includes/sodium_compat/src/Crypto.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Crypto
+ *
+ * ATTENTION!
+ *
+ * If you are using this library, you should be using
+ * ParagonIE_Sodium_Compat in your code, not this class.
+ */
+abstract class ParagonIE_Sodium_Crypto
+{
+    const box_curve25519xsalsa20poly1305_SEEDBYTES = 32;
+    const box_curve25519xsalsa20poly1305_PUBLICKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_SECRETKEYBYTES = 32;
+    const box_curve25519xsalsa20poly1305_BEFORENMBYTES = 32;
+    const box_curve25519xsalsa20poly1305_NONCEBYTES = 24;
+    const box_curve25519xsalsa20poly1305_MACBYTES = 16;
+    const box_curve25519xsalsa20poly1305_BOXZEROBYTES = 16;
+    const box_curve25519xsalsa20poly1305_ZEROBYTES = 32;
+
+    const onetimeauth_poly1305_BYTES = 16;
+    const onetimeauth_poly1305_KEYBYTES = 32;
+
+    const secretbox_xsalsa20poly1305_KEYBYTES = 32;
+    const secretbox_xsalsa20poly1305_NONCEBYTES = 24;
+    const secretbox_xsalsa20poly1305_MACBYTES = 16;
+    const secretbox_xsalsa20poly1305_BOXZEROBYTES = 16;
+    const secretbox_xsalsa20poly1305_ZEROBYTES = 32;
+
+    const stream_salsa20_KEYBYTES = 32;
+
+    /**
+     * HMAC-SHA-512-256 (a.k.a. the leftmost 256 bits of HMAC-SHA-512)
+     *
+     * @param string $message
+     * @param string $key
+     * @return string
+     */
+    public static function auth($message, $key)
+    {
+        return ParagonIE_Sodium_Core_Util::substr(
+            hash_hmac('sha512', $message, $key, true),
+            0,
+            32
+        );
+    }
+
+    /**
+     * HMAC-SHA-512-256 validation. Constant-time via hash_equals().
+     *
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     */
+    public static function auth_verify($mac, $message, $key)
+    {
+        return hash_equals(
+            $mac,
+            self::auth($message, $key)
+        );
+    }
+
+    /**
+     * X25519 key exchange followed by Xsalsa20Poly1305 symmetric encryption
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     */
+    public static function box($plaintext, $nonce, $keypair)
+    {
+        $k = self::box_beforenm(
+            self::box_secretkey($keypair),
+            self::box_publickey($keypair)
+        );
+        $c = self::secretbox($plaintext, $nonce, $k);
+        ParagonIE_Sodium_Compat::memzero($k);
+        return $c;
+    }
+
+    /**
+     * X25519-Xsalsa20-Poly1305 with one ephemeral X25519 keypair.
+     *
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     */
+    public static function box_seal($message, $publicKey)
+    {
+        $ephemeralKeypair = self::box_keypair();
+        $ephemeralSK = self::box_secretkey($ephemeralKeypair);
+        $ephemeralPK = self::box_publickey($ephemeralKeypair);
+
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+        $keypair = self::box_keypair_from_secretkey_and_publickey($ephemeralSK, $publicKey);
+
+        $c = self::box($message, $nonce, $keypair);
+        ParagonIE_Sodium_Compat::memzero($ephemeralSK);
+        ParagonIE_Sodium_Compat::memzero($nonce);
+        return $ephemeralPK . $c;
+    }
+
+    /**
+     * Opens a message encrypted via box_seal().
+     *
+     * @param string $message
+     * @param string $keypair
+     * @return string
+     */
+    public static function box_seal_open($message, $keypair)
+    {
+        $ephemeralPK = ParagonIE_Sodium_Core_Util::substr($message, 0, 32);
+        $c = ParagonIE_Sodium_Core_Util::substr($message, 32);
+
+        $secretKey = self::box_secretkey($keypair);
+        $publicKey = self::box_publickey($keypair);
+
+        $nonce = self::generichash(
+            $ephemeralPK . $publicKey,
+            '',
+            24
+        );
+        $keypair = self::box_keypair_from_secretkey_and_publickey($secretKey, $ephemeralPK);
+        $m = self::box_open($c, $nonce, $keypair);
+        ParagonIE_Sodium_Compat::memzero($secretKey);
+        ParagonIE_Sodium_Compat::memzero($ephemeralPK);
+        ParagonIE_Sodium_Compat::memzero($nonce);
+        return $m;
+    }
+
+    /**
+     * Used by crypto_box() to get the crypto_secretbox() key.
+     *
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     */
+    public static function box_beforenm($sk, $pk)
+    {
+        $s = self::scalarmult($sk, $pk);
+        return ParagonIE_Sodium_Core_HSalsa20::hsalsa20(
+            str_repeat("\x00", 16),
+            $s
+        );
+    }
+
+    /**
+     * @return string
+     */
+    public static function box_keypair()
+    {
+        $sk = random_bytes(32);
+        $pk = self::scalarmult_base($sk);
+        return $sk . $pk;
+    }
+
+    /**
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     */
+    public static function box_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        return ParagonIE_Sodium_Core_Util::substr($sk, 0, 32) .
+            ParagonIE_Sodium_Core_Util::substr($pk, 0, 32);
+    }
+
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    public static function box_secretkey($keypair)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== 64) {
+            throw new RangeException('Must be a keypair.');
+        }
+        return ParagonIE_Sodium_Core_Util::substr($keypair, 0, 32);
+    }
+
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    public static function box_publickey($keypair)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== 64) {
+            throw new RangeException('Must be a keypair.');
+        }
+        return ParagonIE_Sodium_Core_Util::substr($keypair, 32, 32);
+    }
+
+    /**
+     * @param $sk
+     * @return string
+     * @throws RangeException
+     */
+    public static function box_publickey_from_secretkey($sk)
+    {
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== 32) {
+            throw new RangeException('Must be 32 bytes long.');
+        }
+        return self::scalarmult_base($sk);
+    }
+
+    /**
+     * Decrypt a message encrypted with box().
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     */
+    public static function box_open($ciphertext, $nonce, $keypair)
+    {
+        $k = self::box_beforenm(
+            self::box_secretkey($keypair),
+            self::box_publickey($keypair)
+        );
+        $p = self::secretbox_open($ciphertext, $nonce, $k);
+        ParagonIE_Sodium_Compat::memzero($k);
+        return $p;
+    }
+
+    /**
+     * Calculate a BLAKE2b hash.
+     *
+     * @param string $message
+     * @param string|null $key
+     * @param int $outlen
+     * @return string
+     * @throws Exception
+     */
+    public static function generichash($message, $key = '', $outlen = 32)
+    {
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core_BLAKE2b::KEYBYTES) {
+                throw new Exception('Invalid key size');
+            }
+        }
+
+        $in = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($message);
+        $ctx = ParagonIE_Sodium_Core_BLAKE2b::init($k, $outlen);
+        ParagonIE_Sodium_Core_BLAKE2b::update($ctx, $in, $in->count());
+        $out = new SplFixedArray($outlen);
+        $out = ParagonIE_Sodium_Core_BLAKE2b::finish($ctx, $out);
+        return ParagonIE_Sodium_Core_Util::intArrayToString($out->toArray());
+    }
+
+    /**
+     * Finalize a BLAKE2b hashing context, returning the hash.
+     *
+     * @param string $ctx
+     * @param int $outlen
+     * @return string
+     */
+    public static function generichash_final($ctx, $outlen = 32)
+    {
+        if (!is_string($ctx)) {
+            throw new InvalidArgumentException('Context must be a string');
+        }
+        $out = new SplFixedArray($outlen);
+        $context = ParagonIE_Sodium_Core_BLAKE2b::stringToContext($ctx);
+        $out = ParagonIE_Sodium_Core_BLAKE2b::finish($context, $out);
+        return ParagonIE_Sodium_Core_Util::intArrayToString($out->toArray());
+    }
+
+    /**
+     * Initialize a hashing context for BLAKE2b.
+     *
+     * @param string $key
+     * @param int $outputLength
+     * @return string
+     * @throws Exception
+     */
+    public static function generichash_init($key = '', $outputLength = 32)
+    {
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+
+        $k = null;
+        if (!empty($key)) {
+            $k = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($key);
+            if ($k->count() > ParagonIE_Sodium_Core_BLAKE2b::KEYBYTES) {
+                throw new Exception('Invalid key size');
+            }
+        }
+
+        $ctx = ParagonIE_Sodium_Core_BLAKE2b::init($k, $outputLength);
+        return ParagonIE_Sodium_Core_BLAKE2b::contextToString($ctx);
+    }
+
+    /**
+     * Update a hashing context for BLAKE2b with $message
+     *
+     * @param string $ctx
+     * @param string $message
+     * @return string
+     */
+    public static function generichash_update($ctx, $message)
+    {
+        ParagonIE_Sodium_Core_BLAKE2b::pseudoConstructor();
+        $in = ParagonIE_Sodium_Core_BLAKE2b::stringToSplFixedArray($message);
+        $context = ParagonIE_Sodium_Core_BLAKE2b::stringToContext($ctx);
+        ParagonIE_Sodium_Core_BLAKE2b::update($context, $in, $in->count());
+        return ParagonIE_Sodium_Core_BLAKE2b::contextToString($context);
+    }
+
+    /**
+     * Libsodium's crypto_kx().
+     *
+     * @param string $my_sk
+     * @param string $their_pk
+     * @param string $client_pk
+     * @param string $server_pk
+     * @return string
+     */
+    public static function kx($my_sk, $their_pk, $client_pk, $server_pk)
+    {
+        return self::generichash(
+            self::scalarmult($my_sk, $their_pk) .
+            $client_pk .
+            $server_pk
+        );
+    }
+
+    /**
+     * ECDH over Curve25519
+     *
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     */
+    public static function scalarmult($sk, $pk)
+    {
+        return ParagonIE_Sodium_Core_X25519::crypto_scalarmult_curve25519_ref10($sk, $pk);
+    }
+
+    /**
+     * ECDH over Curve25519, using the basepoint.
+     * Used to get a secret key from a public key.
+     *
+     * @param string $n
+     * @return string
+     */
+    public static function scalarmult_base($n)
+    {
+        return ParagonIE_Sodium_Core_X25519::crypto_scalarmult_curve25519_ref10_base($n);
+    }
+
+    /**
+     * Xsalsa20-Poly1305 authenticated symmetric-key encryption.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    public static function secretbox($plaintext, $nonce, $key)
+    {
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+
+        $block0 = str_repeat("\x00", 32);
+        $mlen = ParagonIE_Sodium_Core_Util::strlen($plaintext);
+        $mlen0 = $mlen;
+        if ($mlen0 > 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $mlen0 = 64 - self::secretbox_xsalsa20poly1305_ZEROBYTES;
+        }
+        $block0 .= ParagonIE_Sodium_Core_Util::substr($plaintext, 0, $mlen0);
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20_xor(
+            $block0,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        $state = new ParagonIE_Sodium_Core_Poly1305_State(
+            ParagonIE_Sodium_Core_Util::substr(
+                $block0,
+                0,
+                self::onetimeauth_poly1305_KEYBYTES
+            )
+        );
+
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $block0,
+            self::secretbox_xsalsa20poly1305_ZEROBYTES
+        );
+        if ($mlen > $mlen0) {
+            $c .= ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $plaintext,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+                1,
+                $subkey
+            );
+        }
+        ParagonIE_Sodium_Compat::memzero($block0);
+        ParagonIE_Sodium_Compat::memzero($subkey);
+
+        $state->update($c);
+        $c = $state->finish() . $c;
+        unset($state);
+
+        return $c;
+    }
+
+    /**
+     * Decrypt a ciphertext generated via secretbox().
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws Exception
+     */
+    public static function secretbox_open($ciphertext, $nonce, $key)
+    {
+        $mac = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            0,
+            self::box_curve25519xsalsa20poly1305_MACBYTES
+        );
+        $c = ParagonIE_Sodium_Core_Util::substr(
+            $ciphertext,
+            self::box_curve25519xsalsa20poly1305_MACBYTES
+        );
+        $clen = ParagonIE_Sodium_Core_Util::strlen($c);
+
+        $subkey = ParagonIE_Sodium_Core_HSalsa20::hsalsa20($nonce, $key);
+        $block0 = ParagonIE_Sodium_Core_Salsa20::salsa20(
+            64,
+            ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+            $subkey
+        );
+        if (!ParagonIE_Sodium_Core_Poly1305::onetimeauth_verify($mac, $c, $block0)) {
+            ParagonIE_Sodium_Compat::memzero($subkey);
+            throw new Exception('Invalid MAC');
+        }
+
+        $m = ParagonIE_Sodium_Core_Util::xorStrings(
+            ParagonIE_Sodium_Core_Util::substr($block0, self::secretbox_xsalsa20poly1305_ZEROBYTES),
+            ParagonIE_Sodium_Core_Util::substr($c, 0, self::secretbox_xsalsa20poly1305_ZEROBYTES)
+        );
+        if ($clen > self::secretbox_xsalsa20poly1305_ZEROBYTES) {
+            $m .= ParagonIE_Sodium_Core_Salsa20::salsa20_xor_ic(
+                ParagonIE_Sodium_Core_Util::substr(
+                    $c,
+                    self::secretbox_xsalsa20poly1305_ZEROBYTES
+                ),
+                ParagonIE_Sodium_Core_Util::substr($nonce, 16, 8),
+                1,
+                $subkey
+            );
+        }
+        return $m;
+    }
+
+    /**
+     * Detached Ed25519 signature.
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    public static function sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign_detached($message, $sk);
+    }
+
+    /**
+     * Attached Ed25519 signature. (Returns a signed message.)
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    public static function sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign($message, $sk);
+    }
+
+    /**
+     * Opens a signed message. If valid, returns the message.
+     *
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string
+     */
+    public static function sign_open($signedMessage, $pk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::sign_open($signedMessage, $pk);
+    }
+
+    /**
+     * Verify a detached signature of a given message and public key.
+     *
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     */
+    public static function sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Core_Ed25519::verify_detached($signature, $message, $pk);
+    }
+}

wp-includes/sodium_compat/src/Compat.php

@@ +1 @@
+<?php
+
+/**
+ * Libsodium compatibility layer
+ */
+class ParagonIE_Sodium_Compat
+{
+    /**
+     * @var bool
+     */
+    public static $disableFallbackForUnitTests = false;
+
+    const LIBRARY_VERSION_MAJOR = 9;
+    const LIBRARY_VERSION_MINOR = 1;
+    const VERSION_STRING = 'polyfill-1.0.8';
+
+    // From libsodium
+    const CRYPTO_AUTH_BYTES = 32;
+    const CRYPTO_AUTH_KEYBYTES = 32;
+    const CRYPTO_BOX_SEALBYTES = 16;
+    const CRYPTO_BOX_SECRETKEYBYTES = 32;
+    const CRYPTO_BOX_PUBLICKEYBYTES = 32;
+    const CRYPTO_BOX_KEYPAIRBYTES = 64;
+    const CRYPTO_BOX_MACBYTES = 16;
+    const CRYPTO_BOX_NONCEBYTES = 24;
+    const CRYPTO_BOX_SEEDBYTES = 32;
+    const CRYPTO_KX_BYTES = 32;
+    const CRYPTO_KX_PUBLICKEYBYTES = 32;
+    const CRYPTO_KX_SECRETKEYBYTES = 32;
+    const CRYPTO_GENERICHASH_BYTES = 32;
+    const CRYPTO_GENERICHASH_BYTES_MIN = 16;
+    const CRYPTO_GENERICHASH_BYTES_MAX = 64;
+    const CRYPTO_GENERICHASH_KEYBYTES = 32;
+    const CRYPTO_GENERICHASH_KEYBYTES_MIN = 16;
+    const CRYPTO_GENERICHASH_KEYBYTES_MAX = 64;
+    const CRYPTO_SCALARMULT_BYTES = 32;
+    const CRYPTO_SCALARMULT_SCALARBYTES = 32;
+    const CRYPTO_SHORTHASH_BYTES = 8;
+    const CRYPTO_SHORTHASH_KEYBYTES = 16;
+    const CRYPTO_SECRETBOX_KEYBYTES = 32;
+    const CRYPTO_SECRETBOX_MACBYTES = 16;
+    const CRYPTO_SECRETBOX_NONCEBYTES = 24;
+    const CRYPTO_SIGN_BYTES = 64;
+    const CRYPTO_SIGN_SEEDBYTES = 32;
+    const CRYPTO_SIGN_PUBLICKEYBYTES = 32;
+    const CRYPTO_SIGN_SECRETKEYBYTES = 64;
+    const CRYPTO_SIGN_KEYPAIRBYTES = 96;
+    const CRYPTO_STREAM_KEYBYTES = 32;
+    const CRYPTO_STREAM_NONCEBYTES = 24;
+
+    /**
+     * Cache-timing-safe implementation of bin2hex().
+     *
+     * @param $string
+     * @return string
+     * @throws TypeError
+     */
+    public static function bin2hex($string)
+    {
+        if (!is_string($string)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (self::use_fallback('bin2hex')) {
+            return call_user_func_array(
+                '\\Sodium\\bin2hex',
+                array($string)
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::bin2hex($string);
+    }
+
+    /**
+     * Compare two strings, in constant-time.
+     *
+     * @param string $left
+     * @param string $right
+     * @return int
+     * @throws TypeError
+     */
+    public static function compare($left, $right)
+    {
+        if (!is_string($left)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($right)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (self::use_fallback('compare')) {
+            return call_user_func_array(
+                '\\Sodium\\compare',
+                array($left, $right)
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::compare($left, $right);
+    }
+
+    /**
+     * Authenticate a message. Uses symmetric-key cryptography.
+     *
+     * Algorithm:
+     *     HMAC-SHA512-256. Which is HMAC-SHA-512 truncated to 256 bits.
+     *     Not to be confused with HMAC-SHA-512/256 which would use the
+     *     SHA-512/256 hash function (uses different initial parameters
+     *     but still truncates to 256 bits to sidestep length-extension
+     *     attacks.
+     *
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_auth($message, $key)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_AUTH_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_auth')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_auth',
+                array($message, $key)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::auth($message, $key);
+    }
+
+    /**
+     * Verify the MAC of a message previously authenticated with crypto_auth.
+     *
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_auth_verify($mac, $message, $key)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($mac) !== self::CRYPTO_AUTH_BYTES) {
+            throw new Error('Argument 1 must be CRYPTO_AUTH_BYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_AUTH_KEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_AUTH_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_auth_verify')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_auth_verify',
+                array($mac, $message, $key)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::auth_verify($mac, $message, $key);
+    }
+
+    /**
+     * Authenticated asymmetric-key encryption. Both the sender and recipient
+     * may decrypt messages.
+     *
+     * Algorithm: X25519-Xsalsa20-Poly1305.
+     *     X25519: Elliptic-Curve Diffie Hellman over Curve25519.
+     *     Xsalsa20: Extended-nonce variant of salsa20.
+     *     Poyl1305: Polynomial MAC for one-time message authentication.
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box($plaintext, $nonce, $keypair)
+    {
+        if (!is_string($plaintext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_box')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box',
+                array($plaintext, $nonce, $keypair)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box($plaintext, $nonce, $keypair);
+    }
+
+    /**
+     * Anonymous public-key encryption. Only the recipient may decrypt messages.
+     *
+     * Algorithm: X25519-Xsalsa20-Poly1305, as with crypto_box.
+     *     The sender's X25519 keypair is ephemeral.
+     *     Nonce is generated from the BLAKE2b hash of both public keys.
+     *
+     * This provides ciphertext integrity.
+     *
+     * @param string $plaintext
+     * @param string $publicKey
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_seal($plaintext, $publicKey)
+    {
+        if (!is_string($plaintext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($publicKey)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($publicKey) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_seal')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_seal',
+                array($plaintext, $publicKey)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_seal($plaintext, $publicKey);
+    }
+
+    /**
+     * Opens a message encrypted with crypto_box_seal(). Requires
+     * the recipient's keypair (sk || pk) to decrypt successfully.
+     *
+     * This validates ciphertext integrity.
+     *
+     * @param string $ciphertext
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_seal_open($ciphertext, $keypair)
+    {
+        if (!is_string($ciphertext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_seal_open')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_seal_open',
+                array($ciphertext, $keypair)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_seal_open($ciphertext, $keypair);
+    }
+
+    /**
+     * Generate a new random X25519 keypair.
+     *
+     * @return string
+     */
+    public static function crypto_box_keypair()
+    {
+        if (self::use_fallback('crypto_sign_keypair')) {
+            return call_user_func(
+                '\\Sodium\\crypto_box_keypair'
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_keypair();
+    }
+
+    /**
+     * Combine two keys into a keypair for use in library methods that expect
+     * a keypair. This doesn't necessarily have to be the same person's keys.
+     *
+     * @param string $sk Secret key
+     * @param string $pk Public key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (!is_string($pk)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('box_keypair_from_secretkey_and_publickey')) {
+            return call_user_func_array(
+                '\\Sodium\\box_keypair_from_secretkey_and_publickey',
+                array($sk, $pk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey($sk, $pk);
+    }
+
+    /**
+     * Extract the public key from a crypto_box keypair.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_publickey($keypair)
+    {
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_publickey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_publickey',
+                array($keypair)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_publickey($keypair);
+    }
+
+    /**
+     * Calculate the X25519 public key from a given X25519 secret key.
+     *
+     * @param string $sk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_publickey_from_secretkey($sk)
+    {
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_publickey_from_secretkey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_publickey_from_secretkey',
+                array($sk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_publickey_from_secretkey($sk);
+    }
+
+    /**
+     * Extract the secret key from a crypto_box keypair.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_secretkey($keypair)
+    {
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_secretkey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_secretkey',
+                array($keypair)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_secretkey($keypair);
+    }
+
+    /**
+     * Decrypt a message previously encrypted with crypto_box().
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_box_open($ciphertext, $nonce, $keypair)
+    {
+        if (!is_string($ciphertext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($ciphertext) < self::CRYPTO_BOX_MACBYTES) {
+            throw new Error('Argument 1 must be at least CRYPTO_BOX_MACBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_BOX_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_BOX_KEYPAIRBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_BOX_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_box_open')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_box_open',
+                array($ciphertext, $nonce, $keypair)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::box_open($ciphertext, $nonce, $keypair);
+    }
+
+    /**
+     * Calculates a BLAKE2b hash, with an optional key.
+     *
+     * @param string $message
+     * @param string $key
+     * @param int $length
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_generichash($message, $key = '', $length = 32)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_int($length)) {
+            if (is_numeric($length)) {
+                $length = (int) $length;
+            } else {
+                throw new TypeError('Argument 3 must be an integer');
+            }
+        }
+        if (!empty($key)) {
+            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new Error('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
+            }
+            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new Error('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
+            }
+        }
+        if (self::use_fallback('crypto_generichash')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_generichash',
+                array($message, $key, $length)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::generichash($message, $key, $length);
+    }
+
+    /**
+     * Get the final BLAKE2b hash output for a given context.
+     *
+     * @param string& $ctx
+     * @param int $length
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_generichash_final(&$ctx, $length = 32)
+    {
+        if (!is_string($ctx)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_int($length)) {
+            if (is_numeric($length)) {
+                $length = (int) $length;
+            } else {
+                throw new TypeError('Argument 2 must be an integer');
+            }
+        }
+        if (self::use_fallback('crypto_generichash_final')) {
+            $func = '\\Sodium\\crypto_generichash_final';
+            return $func($ctx, $length);
+        }
+        $result = ParagonIE_Sodium_Crypto::generichash_final($ctx, $length);
+        self::memzero($ctx);
+        return $result;
+    }
+
+    /**
+     * Initialize a BLAKE2b hashing context, for use in a streaming interface.
+     *
+     * @param string $key
+     * @param int $length
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_generichash_init($key = '', $length = 32)
+    {
+        if (!is_string($key)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_int($length)) {
+            if (is_numeric($length)) {
+                $length = (int) $length;
+            } else {
+                throw new TypeError('Argument 2 must be an integer');
+            }
+        }
+        if (!empty($key)) {
+            if (ParagonIE_Sodium_Core_Util::strlen($key) < self::CRYPTO_GENERICHASH_KEYBYTES_MIN) {
+                throw new Error('Unsupported key size. Must be at least CRYPTO_GENERICHASH_KEYBYTES_MIN bytes long.');
+            }
+            if (ParagonIE_Sodium_Core_Util::strlen($key) > self::CRYPTO_GENERICHASH_KEYBYTES_MAX) {
+                throw new Error('Unsupported key size. Must be at most CRYPTO_GENERICHASH_KEYBYTES_MAX bytes long.');
+            }
+        }
+        if (self::use_fallback('crypto_generichash_init')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_generichash_init',
+                array($key, $length)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::generichash_init($key, $length);
+    }
+
+    /**
+     * Update a BLAKE2b hashing context with additional data.
+     *
+     * @param string& $ctx
+     * @param string $message
+     * @return void
+     * @throws TypeError
+     */
+    public static function crypto_generichash_update(&$ctx, $message)
+    {
+        if (!is_string($ctx)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($message)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (self::use_fallback('crypto_generichash_update')) {
+            $func = '\\Sodium\\crypto_generichash_update';
+            $func($ctx, $message);
+            return;
+        }
+        $ctx = ParagonIE_Sodium_Crypto::generichash_update($ctx, $message);
+    }
+
+    /**
+     * Perform a key exchange, between a designated client and a server.
+     *
+     * @param string $my_secret
+     * @param string $their_public
+     * @param string $client_public
+     * @param string $server_public
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_kx($my_secret, $their_public, $client_public, $server_public)
+    {
+        if (!is_string($my_secret)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($my_secret) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (!is_string($their_public)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($their_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (!is_string($client_public)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($client_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (!is_string($server_public)) {
+            throw new TypeError('Argument 4 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($server_public) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 4 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_kx')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_kx',
+                func_get_args()
+            );
+        }
+        return ParagonIE_Sodium_Crypto::kx(
+            $my_secret,
+            $their_public,
+            $client_public,
+            $server_public
+        );
+    }
+
+    /**
+     * Calculate the shared secret between your secret key and your
+     * recipient's public key.
+     *
+     * Algorithm: X25519 (ECDH over Curve25519)
+     *
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult($sk, $pk)
+    {
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (!is_string($pk)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_BOX_PUBLICKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_BOX_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_scalarmult')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_scalarmult',
+                array($sk, $pk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::scalarmult($sk, $pk);
+    }
+
+    /**
+     * Calculate an X25519 public key from an X25519 secret key.
+     *
+     * @param $sk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_scalarmult_base($sk)
+    {
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_BOX_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_BOX_SECRETKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_scalarmult_base')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_scalarmult_base',
+                array($sk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::scalarmult_base($sk);
+    }
+
+    /**
+     * Authenticated symmetric-key encryption.
+     *
+     * Algorithm: Xsalsa20-Poly1305
+     *
+     * @param string $plaintext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_secretbox($plaintext, $nonce, $key)
+    {
+        if (!is_string($plaintext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_secretbox')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_secretbox',
+                array($plaintext, $nonce, $key)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::secretbox($plaintext, $nonce, $key);
+    }
+
+    /**
+     * Decrypts a message previously encrypted with crypto_secretbox().
+     *
+     * @param string $ciphertext
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_secretbox_open($ciphertext, $nonce, $key)
+    {
+        if (!is_string($ciphertext)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_SECRETBOX_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SECRETBOX_KEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_secretbox_open')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_secretbox_open',
+                array($ciphertext, $nonce, $key)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::secretbox_open($ciphertext, $nonce, $key);
+    }
+
+    /**
+     * Calculates a SipHash-2-4 hash of a message for a given key.
+     *
+     * @param string $message
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_shorthash($message, $key)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_SHORTHASH_KEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SHORTHASH_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_shorthash')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_shorthash',
+                array($message, $key)
+            );
+        }
+        return ParagonIE_Sodium_Core_SipHash::sipHash24($message, $key);
+    }
+
+    /**
+     * Expand a key and nonce into a keystream of pseudorandom bytes.
+     *
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_stream($len, $nonce, $key)
+    {
+        if (!is_int($len)) {
+            if (is_numeric($len)) {
+                $len = (int) $len;
+            } else {
+                throw new TypeError('Argument 1 must be an integer');
+            }
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_STREAM_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_stream')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_stream',
+                array($len, $nonce, $key)
+            );
+        }
+        return ParagonIE_Sodium_Core_Xsalsa20::xsalsa20($len, $nonce, $key);
+    }
+
+    /**
+     * DANGER! UNAUTHENTICATED ENCRYPTION!
+     *
+     * Unless you are following expert advice, do not used this feature.
+     *
+     * Algorithm: Xsalsa20
+     *
+     * This DOES NOT provide ciphertext integrity.
+     *
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_stream_xor($message, $nonce, $key)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($nonce)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($key)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($nonce) !== self::CRYPTO_STREAM_NONCEBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SECRETBOX_NONCEBYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($key) !== self::CRYPTO_STREAM_KEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_SECRETBOX_KEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_stream_xor')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_stream_xor',
+                array($message, $nonce, $key)
+            );
+        }
+        return ParagonIE_Sodium_Core_Xsalsa20::xsalsa20_xor($message, $nonce, $key);
+    }
+
+    /**
+     * Returns a signed message. You probably want crypto_sign_detached()
+     * instead, which only returns the signature.
+     *
+     * Algorithm: Ed25519 (EdDSA over Curve25519)
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign($message, $sk)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign',
+                array($message, $sk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::sign($message, $sk);
+    }
+
+    /**
+     * Validates a signed message then returns the message.
+     *
+     * @param string $sm
+     * @param string $pk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_open($sm, $pk)
+    {
+        if (!is_string($sm)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($pk)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_open')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_open',
+                array($sm, $pk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::sign_open($sm, $pk);
+    }
+
+    /**
+     * Generate a new random Ed25519 keypair.
+     *
+     * @return string
+     */
+    public static function crypto_sign_keypair()
+    {
+        if (self::use_fallback('crypto_sign_keypair')) {
+            return call_user_func(
+                '\\Sodium\\crypto_sign_keypair'
+            );
+        }
+        return ParagonIE_Sodium_Core_Ed25519::keypair();
+    }
+
+    /**
+     * Generate an Ed25519 keypair from a seed.
+     *
+     * @return string
+     */
+    public static function crypto_sign_seed_keypair($seed)
+    {
+        if (self::use_fallback('crypto_sign_keypair')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_seed_keypair',
+                array($seed)
+            );
+        }
+        $pk = '';
+        $sk = '';
+        ParagonIE_Sodium_Core_Ed25519::seed_keypair($pk, $sk, $seed);
+        return $sk . $pk;
+    }
+
+    /**
+     * Extract an Ed25519 public key from an Ed25519 keypair.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_publickey($keypair)
+    {
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_publickey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_publickey',
+                array($keypair)
+            );
+        }
+        return ParagonIE_Sodium_Core_Ed25519::publickey($keypair);
+    }
+    /**
+     * Calculate an Ed25519 public key from an Ed25519 secret key.
+     *
+     * @param string $sk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_publickey_from_secretkey($sk)
+    {
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_publickey_from_publickey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_publickey_from_publickey',
+                array($sk)
+            );
+        }
+        return ParagonIE_Sodium_Core_Ed25519::publickey_from_secretkey($sk);
+    }
+
+    /**
+     * Extract an Ed25519 secret key from an Ed25519 keypair.
+     *
+     * @param string $keypair
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_secretkey($keypair)
+    {
+        if (!is_string($keypair)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($keypair) !== self::CRYPTO_SIGN_KEYPAIRBYTES) {
+            throw new Error('Argument 1 must be CRYPTO_SIGN_KEYPAIRBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_secretkey')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_secretkey',
+                array($keypair)
+            );
+        }
+        return ParagonIE_Sodium_Core_Ed25519::secretkey($keypair);
+    }
+
+    /**
+     * Calculate the Ed25519 signature of a message and return ONLY the signature.
+     *
+     * Algorithm: Ed25519 (EdDSA over Curve25519)
+     *
+     * @param string $message
+     * @param string $sk
+     * @return string
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_detached($message, $sk)
+    {
+        if (!is_string($message)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($sk)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($sk) !== self::CRYPTO_SIGN_SECRETKEYBYTES) {
+            throw new Error('Argument 2 must be CRYPTO_SIGN_SECRETKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_detached')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_detached',
+                array($message, $sk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::sign_detached($message, $sk);
+    }
+
+    /**
+     * Verify the signature of a message.
+     *
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     * @throws Error
+     * @throws TypeError
+     */
+    public static function crypto_sign_verify_detached($signature, $message, $pk)
+    {
+        if (!is_string($signature)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($message)) {
+            throw new TypeError('Argument 2 must be a string');
+        }
+        if (!is_string($pk)) {
+            throw new TypeError('Argument 3 must be a string');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($signature) !== self::CRYPTO_SIGN_BYTES) {
+            throw new Error('Argument 1 must be CRYPTO_SIGN_BYTES long.');
+        }
+        if (ParagonIE_Sodium_Core_Util::strlen($pk) !== self::CRYPTO_SIGN_PUBLICKEYBYTES) {
+            throw new Error('Argument 3 must be CRYPTO_SIGN_PUBLICKEYBYTES long.');
+        }
+        if (self::use_fallback('crypto_sign_verify_detached')) {
+            return call_user_func_array(
+                '\\Sodium\\crypto_sign_verify_detached',
+                array($signature, $message, $pk)
+            );
+        }
+        return ParagonIE_Sodium_Crypto::sign_verify_detached($signature, $message, $pk);
+    }
+
+    /**
+     * Cache-timing-safe implementation of hex2bin().
+     *
+     * @param $string
+     * @return string
+     * @throws TypeError
+     */
+    public static function hex2bin($string)
+    {
+        if (!is_string($string)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (self::use_fallback('hex2bin')) {
+            return call_user_func_array(
+                '\\Sodium\\hex2bin',
+                array($string)
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::hex2bin($string);
+    }
+
+    /**
+     * @return int
+     */
+    public static function library_version_major()
+    {
+        if (self::use_fallback('hex2bin')) {
+            return (int) call_user_func('\\Sodium\\library_version_minor');
+        }
+        return self::LIBRARY_VERSION_MAJOR;
+    }
+
+    /**
+     * @return int
+     */
+    public static function library_version_minor()
+    {
+        if (self::use_fallback('library_version_minor')) {
+            return (int) call_user_func('\\Sodium\\library_version_minor');
+        }
+        return self::LIBRARY_VERSION_MINOR;
+    }
+
+    /**
+     * Compare two strings.
+     *
+     * @param string $left
+     * @param string $right
+     * @return int
+     * @throws TypeError
+     */
+    public static function memcmp($left, $right)
+    {
+        if (!is_string($left)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (!is_string($right)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (self::use_fallback('memcmp')) {
+            return call_user_func_array(
+                '\\Sodium\\memcmp',
+                array($left, $right)
+            );
+        }
+        return ParagonIE_Sodium_Core_Util::memcmp($left, $right);
+    }
+
+    /**
+     * This is a NOP in the userland implementation. It's actually not possible
+     * to zero memory buffers in PHP. You need the native library for that.
+     *
+     * @param &string $var
+     * @throws TypeError
+     */
+    public static function memzero(&$var)
+    {
+        if (!is_string($var)) {
+            throw new TypeError('Argument 1 must be a string');
+        }
+        if (self::use_fallback('memzero')) {
+            call_user_func_array(
+                '\\Sodium\\memzero',
+                array(&$var)
+            );
+            return;
+        }
+        // This is the best we can do.
+        unset($var);
+    }
+
+    /**
+     * Generate a string of bytes from the kernel's CSPRNG.
+     * Proudly uses /dev/urandom (if getrandom(2) is not available).
+     *
+     * @param int $numBytes
+     * @return string
+     * @throws TypeError
+     */
+    public static function randombytes_buf($numBytes)
+    {
+        if (!is_int($numBytes)) {
+            if (is_numeric($numBytes)) {
+                $numBytes = (int) $numBytes;
+            } else {
+                throw new TypeError('Argument 1 must be an integer');
+            }
+        }
+        if (self::use_fallback('randombytes_buf')) {
+            return call_user_func_array(
+                '\\Sodium\\randombytes_buf',
+                array($numBytes)
+            );
+        }
+        return random_bytes($numBytes);
+    }
+
+    /**
+     * Generate an integer between 0 and $range (non-inclusive).
+     *
+     * @param int $range
+     * @return int
+     * @throws TypeError
+     */
+    public static function randombytes_uniform($range)
+    {
+        if (!is_int($range)) {
+            if (is_numeric($range)) {
+                $range = (int) $range;
+            } else {
+                throw new TypeError('Argument 1 must be an integer');
+            }
+        }
+        if (self::use_fallback('randombytes_uniform')) {
+            return (int) call_user_func_array(
+                '\\Sodium\\randombytes_uniform',
+                array($range)
+            );
+        }
+        return random_int(0, $range - 1);
+    }
+
+    /**
+     * Generate a random 16-bit integer.
+     *
+     * @return int
+     */
+    public static function randombytes_random16()
+    {
+        if (self::use_fallback('randombytes_random16')) {
+            return (int) call_user_func('\\Sodium\\randombytes_random16');
+        }
+        return random_int(0, 65535);
+    }
+
+    /**
+     * @return string
+     */
+    public static function version_string()
+    {
+        if (self::use_fallback('version_string')) {
+            return (int) call_user_func('\\Sodium\\version_string');
+        }
+        return self::VERSION_STRING;
+    }
+
+    /**
+     * Should we use the libsodium core function instead?
+     *
+     * @param string $sodium_func_name
+     * @return bool
+     */
+    protected static function use_fallback($sodium_func_name = '')
+    {
+        static $res = null;
+        if ($res === null) {
+            $res = extension_loaded('libsodium') && PHP_VERSION_ID >= 50300;
+        }
+        if ($res === false) {
+            // No libsodium installed
+            return false;
+        }
+        if (self::$disableFallbackForUnitTests) {
+            // Don't fallback. Use the PHP implementation.
+            return false;
+        }
+        if (!empty($sodium_func_name)) {
+            return is_callable('\\Sodium\\' . $sodium_func_name);
+        }
+        return true;
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Ge/Cached.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $YplusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $YminusX;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T2d;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Ge_Cached constructor.
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YplusX
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $YminusX
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $Z
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe|null $T2d
+     */
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $YplusX = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $YminusX = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $Z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $T2d = null
+    ) {
+        $this->YplusX = $YplusX;
+        $this->YminusX = $YminusX;
+        $this->Z = $Z;
+        $this->T2d = $T2d;
+    }
+}
+ No newline at end of file

wp-includes/sodium_compat/lib/sodium_compat.php

@@ +1 @@
+<?php
+namespace Sodium;
+
+use ParagonIE_Sodium_Compat;
+
+/**
+ * This file will monkey patch the pure-PHP implementation in place of the
+ * PECL functions, but only if they do not already exist.
+ *
+ * Thus, the functions just proxy to the appropriate ParagonIE_Sodium_Compat
+ * method.
+ */
+if (!is_callable('\\Sodium\\bin2hex')) {
+    /**
+     * @param $string
+     * @return string
+     */
+    function bin2hex($string)
+    {
+        return ParagonIE_Sodium_Compat::bin2hex($string);
+    }
+}
+if (!is_callable('\\Sodium\\compare')) {
+    /**
+     * @param string $a
+     * @param string $b
+     * @return int
+     */
+    function compare($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::compare($a, $b);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_auth')) {
+    /**
+     * @param string $message
+     * @param string $key
+     * @return string
+     */
+    function crypto_auth($message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth($message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_auth_verify')) {
+    /**
+     * @param string $mac
+     * @param string $message
+     * @param string $key
+     * @return bool
+     */
+    function crypto_auth_verify($mac, $message, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_auth_verify($mac, $message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box')) {
+    /**
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string
+     */
+    function crypto_box($message, $nonce, $kp)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box($message, $nonce, $kp);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_keypair')) {
+    /**
+     * @return string
+     */
+    function crypto_box_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair();
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_keypair_from_secretkey_and_publickey')) {
+    /**
+     * @param string $sk
+     * @param string $pk
+     * @return string
+     */
+    function crypto_box_keypair_from_secretkey_and_publickey($sk, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_keypair_from_secretkey_and_publickey($sk, $pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_open')) {
+    /**
+     * @param string $message
+     * @param string $nonce
+     * @param string $kp
+     * @return string
+     */
+    function crypto_box_open($message, $nonce, $kp)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_open($message, $nonce, $kp);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_publickey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    function crypto_box_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_publickey_from_secretkey')) {
+    /**
+     * @param string $sk
+     * @return string
+     */
+    function crypto_box_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_seal')) {
+    /**
+     * @param string $message
+     * @param string $publicKey
+     * @return string
+     */
+    function crypto_box_seal($message, $publicKey)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_seal($message, $publicKey);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_seal_open')) {
+    /**
+     * @param string $message
+     * @param string $kp
+     * @return string
+     */
+    function crypto_box_seal_open($message, $kp)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_seal_open($message, $kp);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_box_secretkey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    function crypto_box_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_box_secretkey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash')) {
+    /**
+     * @param string $message
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     */
+    function crypto_generichash($message, $key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash($message, $key, $outLen);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_final')) {
+    /**
+     * @param string|null $ctx
+     * @param int $outputLength
+     * @return string
+     */
+    function crypto_generichash_final(&$ctx, $outputLength = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_final($ctx, $outputLength);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_init')) {
+    /**
+     * @param string|null $key
+     * @param int $outLen
+     * @return string
+     */
+    function crypto_generichash_init($key = null, $outLen = 32)
+    {
+        return ParagonIE_Sodium_Compat::crypto_generichash_init($key, $outLen);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_generichash_update')) {
+    /**
+     * @param string|null $ctx
+     * @param string $message
+     * @return void
+     */
+    function crypto_generichash_update(&$ctx, $message = '')
+    {
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, $message);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_kx')) {
+    /**
+     * @param string $my_secret
+     * @param string $their_public
+     * @param string $client_public
+     * @param string $server_public
+     * @return string
+     */
+    function crypto_kx($my_secret, $their_public, $client_public, $server_public)
+    {
+        return ParagonIE_Sodium_Compat::crypto_kx(
+            $my_secret,
+            $their_public,
+            $client_public,
+            $server_public
+        );
+    }
+}
+if (!is_callable('\\Sodium\\crypto_scalarmult')) {
+    /**
+     * @param string $n
+     * @param string $p
+     * @return string
+     */
+    function crypto_scalarmult($n, $p)
+    {
+        return ParagonIE_Sodium_Compat::crypto_scalarmult($n, $p);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_secretbox')) {
+    /**
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    function crypto_secretbox($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretbox($message, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_secretbox_open')) {
+    /**
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    function crypto_secretbox_open($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_secretbox_open($message, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_shorthash')) {
+    /**
+     * @param string $message
+     * @param string $key
+     * @return string
+     */
+    function crypto_shorthash($message, $key = '')
+    {
+        return ParagonIE_Sodium_Compat::crypto_shorthash($message, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign')) {
+    /**
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    function crypto_sign($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign($message, $sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_detached')) {
+    /**
+     * @param string $message
+     * @param string $sk
+     * @return string
+     */
+    function crypto_sign_detached($message, $sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_detached($message, $sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_keypair')) {
+    /**
+     * @return string
+     */
+    function crypto_sign_keypair()
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_keypair();
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_open')) {
+    /**
+     * @param string $signedMessage
+     * @param string $pk
+     * @return string
+     */
+    function crypto_sign_open($signedMessage, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_open($signedMessage, $pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_publickey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    function crypto_sign_publickey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_publickey_from_secretkey')) {
+    /**
+     * @param string $sk
+     * @return string
+     */
+    function crypto_sign_publickey_from_secretkey($sk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_publickey_from_secretkey($sk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_secretkey')) {
+    /**
+     * @param string $keypair
+     * @return string
+     */
+    function crypto_sign_secretkey($keypair)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_secretkey($keypair);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_sign_verify_detached')) {
+    /**
+     * @param string $signature
+     * @param string $message
+     * @param string $pk
+     * @return bool
+     */
+    function crypto_sign_verify_detached($signature, $message, $pk)
+    {
+        return ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $message, $pk);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_stream')) {
+    /**
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    function crypto_stream($len, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream($len, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\crypto_stream_xor')) {
+    /**
+     * @param $message
+     * @param $nonce
+     * @param $key
+     * @return mixed
+     */
+    function crypto_stream_xor($message, $nonce, $key)
+    {
+        return ParagonIE_Sodium_Compat::crypto_stream_xor($message, $nonce, $key);
+    }
+}
+if (!is_callable('\\Sodium\\hex2bin')) {
+    /**
+     * @param $string
+     * @return string
+     */
+    function hex2bin($string)
+    {
+        return ParagonIE_Sodium_Compat::hex2bin($string);
+    }
+}
+if (!is_callable('\\Sodium\\memcmp')) {
+    /**
+     * @param string $a
+     * @param string $b
+     * @return int
+     */
+    function memcmp($a, $b)
+    {
+        return ParagonIE_Sodium_Compat::memcmp($a, $b);
+    }
+}
+if (!is_callable('\\Sodium\\randombytes_buf')) {
+    /**
+     * @param int $amount
+     * @return string
+     */
+    function randombytes_buf($amount)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_buf($amount);
+    }
+}
+
+if (!is_callable('\\Sodium\\randombytes_uniform')) {
+    /**
+     * @param int $upperLimit
+     * @return int
+     */
+    function randombytes_uniform($upperLimit)
+    {
+        return ParagonIE_Sodium_Compat::randombytes_uniform($upperLimit);
+    }
+}
+
+if (!is_callable('\\Sodium\\randombytes_random16')) {
+    /**
+     * @return int
+     */
+    function randombytes_random16()
+    {
+        return ParagonIE_Sodium_Compat::randombytes_random16();
+    }
+}
+
+if (!defined('\\Sodium\\CRYPTO_AUTH_BYTES')) {
+    define('\\Sodium\\CRYPTO_AUTH_BYTES', ParagonIE_Sodium_Compat::CRYPTO_AUTH_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_AUTH_KEYBYTES')) {
+    define('\\Sodium\\CRYPTO_AUTH_KEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_AUTH_KEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_SEALBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_SEALBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_SEALBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_SECRETKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_SECRETKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_SECRETKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_PUBLICKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_PUBLICKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_PUBLICKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_KEYPAIRBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_KEYPAIRBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_KEYPAIRBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_MACBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_MACBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_MACBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_NONCEBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_NONCEBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_NONCEBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_BOX_SEEDBYTES')) {
+    define('\\Sodium\\CRYPTO_BOX_SEEDBYTES', ParagonIE_Sodium_Compat::CRYPTO_BOX_SEEDBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_KX_BYTES')) {
+    define('\\Sodium\\CRYPTO_KX_BYTES', ParagonIE_Sodium_Compat::CRYPTO_KX_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_KX_PUBLICKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_KX_PUBLICKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_KX_PUBLICKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_KX_SECRETKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_KX_SECRETKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_KX_SECRETKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_BYTES')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_BYTES', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_BYTES_MIN')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_BYTES_MIN', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MIN);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_BYTES_MAX')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_BYTES_MAX', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_BYTES_MAX);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES_MIN')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES_MIN', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MIN);
+}
+if (!defined('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES_MAX')) {
+    define('\\Sodium\\CRYPTO_GENERICHASH_KEYBYTES_MAX', ParagonIE_Sodium_Compat::CRYPTO_GENERICHASH_KEYBYTES_MAX);
+}
+if (!defined('\\Sodium\\CRYPTO_SCALARMULT_BYTES')) {
+    define('\\Sodium\\CRYPTO_SCALARMULT_BYTES', ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SCALARMULT_SCALARBYTES')) {
+    define('\\Sodium\\CRYPTO_SCALARMULT_SCALARBYTES', ParagonIE_Sodium_Compat::CRYPTO_SCALARMULT_SCALARBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SHORTHASH_BYTES')) {
+    define('\\Sodium\\CRYPTO_SHORTHASH_BYTES', ParagonIE_Sodium_Compat::CRYPTO_SHORTHASH_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SHORTHASH_KEYBYTES')) {
+    define('\\Sodium\\CRYPTO_SHORTHASH_KEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_SHORTHASH_KEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SECRETBOX_KEYBYTES')) {
+    define('\\Sodium\\CRYPTO_SECRETBOX_KEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_KEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SECRETBOX_MACBYTES')) {
+    define('\\Sodium\\CRYPTO_SECRETBOX_MACBYTES', ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_MACBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SECRETBOX_NONCEBYTES')) {
+    define('\\Sodium\\CRYPTO_SECRETBOX_NONCEBYTES', ParagonIE_Sodium_Compat::CRYPTO_SECRETBOX_NONCEBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SIGN_BYTES')) {
+    define('\\Sodium\\CRYPTO_SIGN_BYTES', ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SIGN_SEEDBYTES')) {
+    define('\\Sodium\\CRYPTO_SIGN_SEEDBYTES', ParagonIE_Sodium_Compat::CRYPTO_SIGN_SEEDBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SIGN_PUBLICKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_SIGN_PUBLICKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SIGN_SECRETKEYBYTES')) {
+    define('\\Sodium\\CRYPTO_SIGN_SECRETKEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_SIGN_SECRETKEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_SIGN_KEYPAIRBYTES')) {
+    define('\\Sodium\\CRYPTO_SIGN_KEYPAIRBYTES', ParagonIE_Sodium_Compat::CRYPTO_SIGN_KEYPAIRBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_STREAM_KEYBYTES')) {
+    define('\\Sodium\\CRYPTO_STREAM_KEYBYTES', ParagonIE_Sodium_Compat::CRYPTO_STREAM_KEYBYTES);
+}
+if (!defined('\\Sodium\\CRYPTO_STREAM_NONCEBYTES')) {
+    define('\\Sodium\\CRYPTO_STREAM_NONCEBYTES', ParagonIE_Sodium_Compat::CRYPTO_STREAM_NONCEBYTES);
+}

wp-includes/sodium_compat/src/Core/HSalsa20.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_HSalsa20
+ */
+abstract class ParagonIE_Sodium_Core_HSalsa20 extends ParagonIE_Sodium_Core_Salsa20
+{
+    /**
+     * Calculate an hsalsa20 hash of a single block
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string
+     */
+    public static function hsalsa20($in, $k, $c = null)
+    {
+        if ($c === null) {
+            $x0  = 0x61707865;
+            $x5  = 0x3320646e;
+            $x10 = 0x79622d32;
+            $x15 = 0x6b206574;
+        } else {
+            $x0  = self::load_4(self::substr($c,  0, 4));
+            $x5  = self::load_4(self::substr($c,  4, 4));
+            $x10 = self::load_4(self::substr($c,  8, 4));
+            $x15 = self::load_4(self::substr($c, 12, 4));
+        }
+        $x1  = self::load_4(self::substr($k,  0, 4));
+        $x2  = self::load_4(self::substr($k,  4, 4));
+        $x3  = self::load_4(self::substr($k,  8, 4));
+        $x4  = self::load_4(self::substr($k, 12, 4));
+        $x11 = self::load_4(self::substr($k, 16, 4));
+        $x12 = self::load_4(self::substr($k, 20, 4));
+        $x13 = self::load_4(self::substr($k, 24, 4));
+        $x14 = self::load_4(self::substr($k, 28, 4));
+        $x6  = self::load_4(self::substr($in, 0, 4));
+        $x7  = self::load_4(self::substr($in, 4, 4));
+        $x8  = self::load_4(self::substr($in, 8, 4));
+        $x9  = self::load_4(self::substr($in, 12, 4));
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4 ^= self::rotate($x0 + $x12, 7);
+            $x8 ^= self::rotate($x4 + $x0, 9);
+            $x12 ^= self::rotate($x8 + $x4, 13);
+            $x0 ^= self::rotate($x12 + $x8, 18);
+            $x9 ^= self::rotate($x5 + $x1, 7);
+            $x13 ^= self::rotate($x9 + $x5, 9);
+            $x1 ^= self::rotate($x13 + $x9, 13);
+            $x5 ^= self::rotate($x1 + $x13, 18);
+            $x14 ^= self::rotate($x10 + $x6, 7);
+            $x2 ^= self::rotate($x14 + $x10, 9);
+            $x6 ^= self::rotate($x2 + $x14, 13);
+            $x10 ^= self::rotate($x6 + $x2, 18);
+            $x3 ^= self::rotate($x15 + $x11, 7);
+            $x7 ^= self::rotate($x3 + $x15, 9);
+            $x11 ^= self::rotate($x7 + $x3, 13);
+            $x15 ^= self::rotate($x11 + $x7, 18);
+            $x1 ^= self::rotate($x0 + $x3, 7);
+            $x2 ^= self::rotate($x1 + $x0, 9);
+            $x3 ^= self::rotate($x2 + $x1, 13);
+            $x0 ^= self::rotate($x3 + $x2, 18);
+            $x6 ^= self::rotate($x5 + $x4, 7);
+            $x7 ^= self::rotate($x6 + $x5, 9);
+            $x4 ^= self::rotate($x7 + $x6, 13);
+            $x5 ^= self::rotate($x4 + $x7, 18);
+            $x11 ^= self::rotate($x10 + $x9, 7);
+            $x8 ^= self::rotate($x11 + $x10, 9);
+            $x9 ^= self::rotate($x8 + $x11, 13);
+            $x10 ^= self::rotate($x9 + $x8, 18);
+            $x12 ^= self::rotate($x15 + $x14, 7);
+            $x13 ^= self::rotate($x12 + $x15, 9);
+            $x14 ^= self::rotate($x13 + $x12, 13);
+            $x15 ^= self::rotate($x14 + $x13, 18);
+        }
+
+        return self::store32_le($x0) .
+            self::store32_le($x5) .
+            self::store32_le($x10) .
+            self::store32_le($x15) .
+            self::store32_le($x6) .
+            self::store32_le($x7) .
+            self::store32_le($x8) .
+            self::store32_le($x9);
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Fe.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Fe
+ *
+ * This represents a Field Element
+ */
+class ParagonIE_Sodium_Core_Curve25519_Fe implements ArrayAccess
+{
+    /**
+     * @var array
+     */
+    protected $container = array();
+
+    /**
+     * @var int
+     */
+    protected $size = 10;
+
+    /**
+     * ParagonIE_Sodium_Core_Curve25519_Fe constructor.
+     * @param int $size
+     */
+    public function __construct($size = 10)
+    {
+        $this->size = 10;
+    }
+
+    /**
+     * @param array $array
+     * @param bool $save_indexes
+     * @return self
+     */
+    public static function fromArray($array, $save_indexes = null)
+    {
+        $count = count($array);
+        if ($save_indexes) {
+            $keys = array_keys($array);
+        } else {
+            $keys = range(0, $count - 1);
+        }
+        $array = array_values($array);
+
+        $obj = new ParagonIE_Sodium_Core_Curve25519_Fe($count);
+        if ($save_indexes) {
+            for ($i = 0; $i < $count; ++$i) {
+                $obj->offsetSet($keys[$i], $array[$i]);
+            }
+        } else {
+            for ($i = 0; $i < $count; ++$i) {
+                $obj->offsetSet($i, $array[$i]);
+            }
+        }
+        return $obj;
+    }
+
+    /**
+     * @param mixed $offset
+     * @param mixed $value
+     */
+    public function offsetSet($offset, $value)
+    {
+        if (!is_int($value)) {
+            throw new InvalidArgumentException('Expected an integer');
+        }
+        if (is_null($offset)) {
+            $this->container[] = $value;
+        } else {
+            $this->container[$offset] = $value;
+        }
+    }
+
+    /**
+     * @param mixed $offset
+     * @return bool
+     */
+    public function offsetExists($offset)
+    {
+        return isset($this->container[$offset]);
+    }
+
+    /**
+     * @param mixed $offset
+     */
+    public function offsetUnset($offset)
+    {
+        unset($this->container[$offset]);
+    }
+
+    /**
+     * @param mixed $offset
+     * @return mixed|null
+     */
+    public function offsetGet($offset)
+    {
+        return isset($this->container[$offset])
+            ? $this->container[$offset]
+            : null;
+    }
+
+    /**
+     * @return array
+     */
+    public function __debugInfo()
+    {
+        return array(implode(', ', $this->container));
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/H.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_H
+ */
+class ParagonIE_Sodium_Core_Curve25519_H extends ParagonIE_Sodium_Core_Util
+{
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base.h
+     *
+     * @var array Basically, int[32][8][3][10]
+     */
+    protected static $base = array(
+        array(
+            array(
+                array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+                array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+                array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+            ),
+            array(
+                array(-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303),
+                array(-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081),
+                array(26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697),
+            ),
+            array(
+                array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
+                array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
+                array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
+            ),
+            array(
+                array(-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540),
+                array(23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397),
+                array(7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325),
+            ),
+            array(
+                array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
+                array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
+                array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
+            ),
+            array(
+                array(-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777),
+                array(-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737),
+                array(-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652),
+            ),
+            array(
+                array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
+                array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
+                array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
+            ),
+            array(
+                array(14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726),
+                array(-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955),
+                array(27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425),
+            ),
+        ),
+        array(
+            array(
+                array(-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171),
+                array(27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510),
+                array(17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660),
+            ),
+            array(
+                array(-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639),
+                array(29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963),
+                array(5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950),
+            ),
+            array(
+                array(-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568),
+                array(12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335),
+                array(25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628),
+            ),
+            array(
+                array(-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007),
+                array(-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772),
+                array(-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653),
+            ),
+            array(
+                array(2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567),
+                array(13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686),
+                array(21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372),
+            ),
+            array(
+                array(-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887),
+                array(-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954),
+                array(-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953),
+            ),
+            array(
+                array(24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833),
+                array(-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532),
+                array(-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876),
+            ),
+            array(
+                array(2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268),
+                array(33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214),
+                array(1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038),
+            ),
+        ),
+        array(
+            array(
+                array(6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800),
+                array(4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645),
+                array(-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664),
+            ),
+            array(
+                array(1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933),
+                array(-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182),
+                array(-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222),
+            ),
+            array(
+                array(-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991),
+                array(20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880),
+                array(9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092),
+            ),
+            array(
+                array(-16160072, 5472695, 31895588, 4744994, 8823515, 10365685, -27224800, 9448613, -28774454, 366295),
+                array(19153450, 11523972, -11096490, -6503142, -24647631, 5420647, 28344573, 8041113, 719605, 11671788),
+                array(8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916, -15266516, 27000813, -10195553),
+            ),
+            array(
+                array(-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065, 5336097, 6750977, -14521026),
+                array(11836410, -3979488, 26297894, 16080799, 23455045, 15735944, 1695823, -8819122, 8169720, 16220347),
+                array(-18115838, 8653647, 17578566, -6092619, -8025777, -16012763, -11144307, -2627664, -5990708, -14166033),
+            ),
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+                array(31879134, -8918693, 17258761, 90626, -8041836, -4917709, 24162788, -9650886, -17970238, 12833045),
+                array(19073683, 14851414, -24403169, -11860168, 7625278, 11091125, -19619190, 2074449, -9413939, 14905377),
+                array(24483667, -11935567, -2518866, -11547418, -1553130, 15355506, -25282080, 9253129, 27628530, -7555480),
+            ),
+            array(
+                array(17597607, 8340603, 19355617, 552187, 26198470, -3176583, 4593324, -9157582, -14110875, 15297016),
+                array(510886, 14337390, -31785257, 16638632, 6328095, 2713355, -20217417, -11864220, 8683221, 2921426),
+                array(18606791, 11874196, 27155355, -5281482, -24031742, 6265446, -25178240, -1278924, 4674690, 13890525),
+            ),
+            array(
+                array(13609624, 13069022, -27372361, -13055908, 24360586, 9592974, 14977157, 9835105, 4389687, 288396),
+                array(9922506, -519394, 13613107, 5883594, -18758345, -434263, -12304062, 8317628, 23388070, 16052080),
+                array(12720016, 11937594, -31970060, -5028689, 26900120, 8561328, -20155687, -11632979, -14754271, -10812892),
+            ),
+            array(
+                array(15961858, 14150409, 26716931, -665832, -22794328, 13603569, 11829573, 7467844, -28822128, 929275),
+                array(11038231, -11582396, -27310482, -7316562, -10498527, -16307831, -23479533, -9371869, -21393143, 2465074),
+                array(20017163, -4323226, 27915242, 1529148, 12396362, 15675764, 13817261, -9658066, 2463391, -4622140),
+            ),
+            array(
+                array(-16358878, -12663911, -12065183, 4996454, -1256422, 1073572, 9583558, 12851107, 4003896, 12673717),
+                array(-1731589, -15155870, -3262930, 16143082, 19294135, 13385325, 14741514, -9103726, 7903886, 2348101),
+                array(24536016, -16515207, 12715592, -3862155, 1511293, 10047386, -3842346, -7129159, -28377538, 10048127),
+            ),
+        ),
+        array(
+            array(
+                array(-12622226, -6204820, 30718825, 2591312, -10617028, 12192840, 18873298, -7297090, -32297756, 15221632),
+                array(-26478122, -11103864, 11546244, -1852483, 9180880, 7656409, -21343950, 2095755, 29769758, 6593415),
+                array(-31994208, -2907461, 4176912, 3264766, 12538965, -868111, 26312345, -6118678, 30958054, 8292160),
+            ),
+            array(
+                array(31429822, -13959116, 29173532, 15632448, 12174511, -2760094, 32808831, 3977186, 26143136, -3148876),
+                array(22648901, 1402143, -22799984, 13746059, 7936347, 365344, -8668633, -1674433, -3758243, -2304625),
+                array(-15491917, 8012313, -2514730, -12702462, -23965846, -10254029, -1612713, -1535569, -16664475, 8194478),
+            ),
+            array(
+                array(27338066, -7507420, -7414224, 10140405, -19026427, -6589889, 27277191, 8855376, 28572286, 3005164),
+                array(26287124, 4821776, 25476601, -4145903, -3764513, -15788984, -18008582, 1182479, -26094821, -13079595),
+                array(-7171154, 3178080, 23970071, 6201893, -17195577, -4489192, -21876275, -13982627, 32208683, -1198248),
+            ),
+            array(
+                array(-16657702, 2817643, -10286362, 14811298, 6024667, 13349505, -27315504, -10497842, -27672585, -11539858),
+                array(15941029, -9405932, -21367050, 8062055, 31876073, -238629, -15278393, -1444429, 15397331, -4130193),
+                array(8934485, -13485467, -23286397, -13423241, -32446090, 14047986, 31170398, -1441021, -27505566, 15087184),
+            ),
+            array(
+                array(-18357243, -2156491, 24524913, -16677868, 15520427, -6360776, -15502406, 11461896, 16788528, -5868942),
+                array(-1947386, 16013773, 21750665, 3714552, -17401782, -16055433, -3770287, -10323320, 31322514, -11615635),
+                array(21426655, -5650218, -13648287, -5347537, -28812189, -4920970, -18275391, -14621414, 13040862, -12112948),
+            ),
+            array(
+                array(11293895, 12478086, -27136401, 15083750, -29307421, 14748872, 14555558, -13417103, 1613711, 4896935),
+                array(-25894883, 15323294, -8489791, -8057900, 25967126, -13425460, 2825960, -4897045, -23971776, -11267415),
+                array(-15924766, -5229880, -17443532, 6410664, 3622847, 10243618, 20615400, 12405433, -23753030, -8436416),
+            ),
+            array(
+                array(-7091295, 12556208, -20191352, 9025187, -17072479, 4333801, 4378436, 2432030, 23097949, -566018),
+                array(4565804, -16025654, 20084412, -7842817, 1724999, 189254, 24767264, 10103221, -18512313, 2424778),
+                array(366633, -11976806, 8173090, -6890119, 30788634, 5745705, -7168678, 1344109, -3642553, 12412659),
+            ),
+            array(
+                array(-24001791, 7690286, 14929416, -168257, -32210835, -13412986, 24162697, -15326504, -3141501, 11179385),
+                array(18289522, -14724954, 8056945, 16430056, -21729724, 7842514, -6001441, -1486897, -18684645, -11443503),
+                array(476239, 6601091, -6152790, -9723375, 17503545, -4863900, 27672959, 13403813, 11052904, 5219329),
+            ),
+        ),
+        array(
+            array(
+                array(20678546, -8375738, -32671898, 8849123, -5009758, 14574752, 31186971, -3973730, 9014762, -8579056),
+                array(-13644050, -10350239, -15962508, 5075808, -1514661, -11534600, -33102500, 9160280, 8473550, -3256838),
+                array(24900749, 14435722, 17209120, -15292541, -22592275, 9878983, -7689309, -16335821, -24568481, 11788948),
+            ),
+            array(
+                array(-3118155, -11395194, -13802089, 14797441, 9652448, -6845904, -20037437, 10410733, -24568470, -1458691),
+                array(-15659161, 16736706, -22467150, 10215878, -9097177, 7563911, 11871841, -12505194, -18513325, 8464118),
+                array(-23400612, 8348507, -14585951, -861714, -3950205, -6373419, 14325289, 8628612, 33313881, -8370517),
+            ),
+            array(
+                array(-20186973, -4967935, 22367356, 5271547, -1097117, -4788838, -24805667, -10236854, -8940735, -5818269),
+                array(-6948785, -1795212, -32625683, -16021179, 32635414, -7374245, 15989197, -12838188, 28358192, -4253904),
+                array(-23561781, -2799059, -32351682, -1661963, -9147719, 10429267, -16637684, 4072016, -5351664, 5596589),
+            ),
+            array(
+                array(-28236598, -3390048, 12312896, 6213178, 3117142, 16078565, 29266239, 2557221, 1768301, 15373193),
+                array(-7243358, -3246960, -4593467, -7553353, -127927, -912245, -1090902, -4504991, -24660491, 3442910),
+                array(-30210571, 5124043, 14181784, 8197961, 18964734, -11939093, 22597931, 7176455, -18585478, 13365930),
+            ),
+            array(
+                array(-7877390, -1499958, 8324673, 4690079, 6261860, 890446, 24538107, -8570186, -9689599, -3031667),
+                array(25008904, -10771599, -4305031, -9638010, 16265036, 15721635, 683793, -11823784, 15723479, -15163481),
+                array(-9660625, 12374379, -27006999, -7026148, -7724114, -12314514, 11879682, 5400171, 519526, -1235876),
+            ),
+            array(
+                array(22258397, -16332233, -7869817, 14613016, -22520255, -2950923, -20353881, 7315967, 16648397, 7605640),
+                array(-8081308, -8464597, -8223311, 9719710, 19259459, -15348212, 23994942, -5281555, -9468848, 4763278),
+                array(-21699244, 9220969, -15730624, 1084137, -25476107, -2852390, 31088447, -7764523, -11356529, 728112),
+            ),
+            array(
+                array(26047220, -11751471, -6900323, -16521798, 24092068, 9158119, -4273545, -12555558, -29365436, -5498272),
+                array(17510331, -322857, 5854289, 8403524, 17133918, -3112612, -28111007, 12327945, 10750447, 10014012),
+                array(-10312768, 3936952, 9156313, -8897683, 16498692, -994647, -27481051, -666732, 3424691, 7540221),
+            ),
+            array(
+                array(30322361, -6964110, 11361005, -4143317, 7433304, 4989748, -7071422, -16317219, -9244265, 15258046),
+                array(13054562, -2779497, 19155474, 469045, -12482797, 4566042, 5631406, 2711395, 1062915, -5136345),
+                array(-19240248, -11254599, -29509029, -7499965, -5835763, 13005411, -6066489, 12194497, 32960380, 1459310),
+            ),
+        ),
+        array(
+            array(
+                array(19852034, 7027924, 23669353, 10020366, 8586503, -6657907, 394197, -6101885, 18638003, -11174937),
+                array(31395534, 15098109, 26581030, 8030562, -16527914, -5007134, 9012486, -7584354, -6643087, -5442636),
+                array(-9192165, -2347377, -1997099, 4529534, 25766844, 607986, -13222, 9677543, -32294889, -6456008),
+            ),
+            array(
+                array(-2444496, -149937, 29348902, 8186665, 1873760, 12489863, -30934579, -7839692, -7852844, -8138429),
+                array(-15236356, -15433509, 7766470, 746860, 26346930, -10221762, -27333451, 10754588, -9431476, 5203576),
+                array(31834314, 14135496, -770007, 5159118, 20917671, -16768096, -7467973, -7337524, 31809243, 7347066),
+            ),
+            array(
+                array(-9606723, -11874240, 20414459, 13033986, 13716524, -11691881, 19797970, -12211255, 15192876, -2087490),
+                array(-12663563, -2181719, 1168162, -3804809, 26747877, -14138091, 10609330, 12694420, 33473243, -13382104),
+                array(33184999, 11180355, 15832085, -11385430, -1633671, 225884, 15089336, -11023903, -6135662, 14480053),
+            ),
+            array(
+                array(31308717, -5619998, 31030840, -1897099, 15674547, -6582883, 5496208, 13685227, 27595050, 8737275),
+                array(-20318852, -15150239, 10933843, -16178022, 8335352, -7546022, -31008351, -12610604, 26498114, 66511),
+                array(22644454, -8761729, -16671776, 4884562, -3105614, -13559366, 30540766, -4286747, -13327787, -7515095),
+            ),
+            array(
+                array(-28017847, 9834845, 18617207, -2681312, -3401956, -13307506, 8205540, 13585437, -17127465, 15115439),
+                array(23711543, -672915, 31206561, -8362711, 6164647, -9709987, -33535882, -1426096, 8236921, 16492939),
+                array(-23910559, -13515526, -26299483, -4503841, 25005590, -7687270, 19574902, 10071562, 6708380, -6222424),
+            ),
+            array(
+                array(2101391, -4930054, 19702731, 2367575, -15427167, 1047675, 5301017, 9328700, 29955601, -11678310),
+                array(3096359, 9271816, -21620864, -15521844, -14847996, -7592937, -25892142, -12635595, -9917575, 6216608),
+                array(-32615849, 338663, -25195611, 2510422, -29213566, -13820213, 24822830, -6146567, -26767480, 7525079),
+            ),
+            array(
+                array(-23066649, -13985623, 16133487, -7896178, -3389565, 778788, -910336, -2782495, -19386633, 11994101),
+                array(21691500, -13624626, -641331, -14367021, 3285881, -3483596, -25064666, 9718258, -7477437, 13381418),
+                array(18445390, -4202236, 14979846, 11622458, -1727110, -3582980, 23111648, -6375247, 28535282, 15779576),
+            ),
+            array(
+                array(30098053, 3089662, -9234387, 16662135, -21306940, 11308411, -14068454, 12021730, 9955285, -16303356),
+                array(9734894, -14576830, -7473633, -9138735, 2060392, 11313496, -18426029, 9924399, 20194861, 13380996),
+                array(-26378102, -7965207, -22167821, 15789297, -18055342, -6168792, -1984914, 15707771, 26342023, 10146099),
+            ),
+        ),
+        array(
+            array(
+                array(-26016874, -219943, 21339191, -41388, 19745256, -2878700, -29637280, 2227040, 21612326, -545728),
+                array(-13077387, 1184228, 23562814, -5970442, -20351244, -6348714, 25764461, 12243797, -20856566, 11649658),
+                array(-10031494, 11262626, 27384172, 2271902, 26947504, -15997771, 39944, 6114064, 33514190, 2333242),
+            ),
+            array(
+                array(-21433588, -12421821, 8119782, 7219913, -21830522, -9016134, -6679750, -12670638, 24350578, -13450001),
+                array(-4116307, -11271533, -23886186, 4843615, -30088339, 690623, -31536088, -10406836, 8317860, 12352766),
+                array(18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373),
+            ),
+            array(
+                array(26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458),
+                array(-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628),
+                array(-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657),
+            ),
+            array(
+                array(-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062),
+                array(25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616),
+                array(31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014),
+            ),
+            array(
+                array(24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383),
+                array(-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814),
+                array(-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718),
+            ),
+            array(
+                array(30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417),
+                array(2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222),
+                array(33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444),
+            ),
+            array(
+                array(-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597),
+                array(23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970),
+                array(1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799),
+            ),
+            array(
+                array(-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647),
+                array(13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511),
+                array(-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032),
+            ),
+        ),
+        array(
+            array(
+                array(9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834),
+                array(-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461),
+                array(29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062),
+            ),
+            array(
+                array(-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516),
+                array(-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547),
+                array(-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240),
+            ),
+            array(
+                array(-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038),
+                array(-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741),
+                array(16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103),
+            ),
+            array(
+                array(-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747),
+                array(-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323),
+                array(31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016),
+            ),
+            array(
+                array(-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373),
+                array(15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228),
+                array(-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141),
+            ),
+            array(
+                array(16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399),
+                array(11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831),
+                array(-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376),
+            ),
+            array(
+                array(-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313),
+                array(-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958),
+                array(-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577),
+            ),
+            array(
+                array(-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743),
+                array(29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684),
+                array(-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476),
+            ),
+        )
+    );
+
+    /**
+     * See: libsodium's crypto_core/curve25519/ref10/base2.h
+     *
+     * @var array basically int[8][3]
+     */
+    protected static $base2 = array(
+        array(
+            array(25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605),
+            array(-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378),
+            array(-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546),
+        ),
+        array(
+            array(15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024),
+            array(16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574),
+            array(30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357),
+        ),
+        array(
+            array(10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380),
+            array(4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306),
+            array(19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942),
+        ),
+        array(
+            array(5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766),
+            array(-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701),
+            array(28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300),
+        ),
+        array(
+            array(-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877),
+            array(-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951),
+            array(4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784),
+        ),
+        array(
+            array(-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436),
+            array(25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918),
+            array(23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877),
+        ),
+        array(
+            array(-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800),
+            array(-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305),
+            array(-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300),
+        ),
+        array(
+            array(-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876),
+            array(-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619),
+            array(-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683),
+        )
+    );
+
+    /**
+     * 37095705934669439343138083508754565189542113879843219016388785533085940283555
+     *
+     * @var int[]
+     */
+    protected static $d = array(
+        -10913610,
+        13857413,
+        -15372611,
+        6949391,
+        114729,
+        -8787816,
+        -6275908,
+        -3247719,
+        -18696448,
+        -12055116
+    );
+
+    /**
+     * 2 * d = 16295367250680780974490674513165176452449235426866156013048779062215315747161
+     *
+     * @var int[]
+     */
+    protected static $d2 = array(
+        -21827239,
+        -5839606,
+        -30745221,
+        13898782,
+        229458,
+        15978800,
+        -12551817,
+        -6495438,
+        29715968,
+        9444199
+    );
+
+    /**
+     * sqrt(-1)
+     *
+     * @var int[]
+     */
+    protected static $sqrtm1 = array(
+        -32595792,
+        -7943725,
+        9377950,
+        3500415,
+        12389472,
+        -272473,
+        -25146209,
+        -2005654,
+        326686,
+        11406482
+    );
+}
+ No newline at end of file

wp-includes/sodium_compat/src/Core/Curve25519.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519
+ *
+ * Implements Curve25519 core functions
+ *
+ * Based on the ref10 curve25519 code provided by libsodium
+ *
+ * @ref https://github.com/jedisct1/libsodium/blob/master/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c
+ */
+abstract class ParagonIE_Sodium_Core_Curve25519 extends ParagonIE_Sodium_Core_Curve25519_H
+{
+    /**
+     * Get a field element of size 10 with a value of 0
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_0()
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0
+        ));
+    }
+
+    /**
+     * Get a field element of size 10 with a value of 1
+     *
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_1()
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(array(
+            1,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0,
+            0
+        ));
+    }
+
+    /**
+     * Add two field elements.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_add(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g
+    ) {
+        $arr = array();
+        for ($i = 0; $i < 10; ++$i) {
+            $arr[$i] = (int) ($f[$i] + $g[$i]);
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($arr);
+    }
+
+    /**
+     * Constant-time conditional move.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_cmov(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        $h = array();
+        $b *= -1;
+        for ($i = 0; $i < 10; ++$i) {
+            $x = (($f[$i] ^ $g[$i]) & $b);
+            $h[$i] = $f[$i] ^ $x;
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+    }
+
+    /**
+     * Create a copy of a field element.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_copy(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = clone $f;
+        return $h;
+    }
+
+    /**
+     * Give: 32-byte string.
+     * Receive: A field element object to use for internal calculations.
+     *
+     * @param string $s
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     * @throws RangeException
+     */
+    public static function fe_frombytes($s)
+    {
+        if (self::strlen($s) !== 32) {
+            throw new RangeException('Expected a 32-byte string.');
+        }
+        $h0 = self::load_4($s);
+        $h1 = self::load_3(self::substr($s, 4, 3)) << 6;
+        $h2 = self::load_3(self::substr($s, 7, 3)) << 5;
+        $h3 = self::load_3(self::substr($s, 10, 3)) << 3;
+        $h4 = self::load_3(self::substr($s, 13, 3)) << 2;
+        $h5 = self::load_4(self::substr($s, 16, 4));
+        $h6 = self::load_3(self::substr($s, 20, 3)) << 7;
+        $h7 = self::load_3(self::substr($s, 23, 3)) << 5;
+        $h8 = self::load_3(self::substr($s, 26, 3)) << 4;
+        $h9 = (self::load_3(self::substr($s, 29, 3)) & 8388607) << 2;
+
+        $carry9 = ($h9 + (1 << 24)) >> 25;
+        $h0 += $carry9 * 19;
+        $h9 -= $carry9 * (1 << 25);
+        $carry1 = ($h1 + (1 << 24)) >> 25;
+        $h2 += $carry1;
+        $h1 -= $carry1 * (1 << 25);
+        $carry3 = ($h3 + (1 << 24)) >> 25;
+        $h4 += $carry3;
+        $h3 -= $carry3 * (1 << 25);
+        $carry5 = ($h5 + (1 << 24)) >> 25;
+        $h6 += $carry5;
+        $h5 -= $carry5 * (1 << 25);
+        $carry7 = ($h7 + (1 << 24)) >> 25;
+        $h8 += $carry7;
+        $h7 -= $carry7 * (1 << 25);
+
+        $carry0 = ($h0 + (1 << 25)) >> 26;
+        $h1 += $carry0;
+        $h0 -= $carry0 * (1 << 26);
+        $carry2 = ($h2 + (1 << 25)) >> 26;
+        $h3 += $carry2;
+        $h2 -= $carry2 * (1 << 26);
+        $carry4 = ($h4 + (1 << 25)) >> 26;
+        $h5 += $carry4;
+        $h4 -= $carry4 * (1 << 26);
+        $carry6 = ($h6 + (1 << 25)) >> 26;
+        $h7 += $carry6;
+        $h6 -= $carry6 * (1 << 26);
+        $carry8 = ($h8 + (1 << 25)) >> 26;
+        $h9 += $carry8;
+        $h8 -= $carry8 * (1 << 26);
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * Convert a field element to a byte string.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $h
+     * @return string
+     */
+    public static function fe_tobytes(ParagonIE_Sodium_Core_Curve25519_Fe $h)
+    {
+        $h[0] = (int) $h[0];
+        $h[1] = (int) $h[1];
+        $h[2] = (int) $h[2];
+        $h[3] = (int) $h[3];
+        $h[4] = (int) $h[4];
+        $h[5] = (int) $h[5];
+        $h[6] = (int) $h[6];
+        $h[7] = (int) $h[7];
+        $h[8] = (int) $h[8];
+        $h[9] = (int) $h[9];
+
+        $q = (19 * $h[9] + (1 << 24)) >> 25;
+        $q = ($h[0] + $q) >> 26;
+        $q = ($h[1] + $q) >> 25;
+        $q = ($h[2] + $q) >> 26;
+        $q = ($h[3] + $q) >> 25;
+        $q = ($h[4] + $q) >> 26;
+        $q = ($h[5] + $q) >> 25;
+        $q = ($h[6] + $q) >> 26;
+        $q = ($h[7] + $q) >> 25;
+        $q = ($h[8] + $q) >> 26;
+        $q = ($h[9] + $q) >> 25;
+
+        $h[0] += 19 * $q;
+
+        $carry0 = $h[0] >> 26;
+        $h[1] += $carry0;
+        $h[0] -= $carry0 * (1 << 26);
+        $carry1 = $h[1] >> 25;
+        $h[2] += $carry1;
+        $h[1] -= $carry1 * (1 << 25);
+        $carry2 = $h[2] >> 26;
+        $h[3] += $carry2;
+        $h[2] -= $carry2 * (1 << 26);
+        $carry3 = $h[3] >> 25;
+        $h[4] += $carry3;
+        $h[3] -= $carry3 * (1 << 25);
+        $carry4 = $h[4] >> 26;
+        $h[5] += $carry4;
+        $h[4] -= $carry4 * (1 << 26);
+        $carry5 = $h[5] >> 25;
+        $h[6] += $carry5;
+        $h[5] -= $carry5 * (1 << 25);
+        $carry6 = $h[6] >> 26;
+        $h[7] += $carry6;
+        $h[6] -= $carry6 * (1 << 26);
+        $carry7 = $h[7] >> 25;
+        $h[8] += $carry7;
+        $h[7] -= $carry7 * (1 << 25);
+        $carry8 = $h[8] >> 26;
+        $h[9] += $carry8;
+        $h[8] -= $carry8 * (1 << 26);
+        $carry9 = $h[9] >> 25;
+        $h[9] -= $carry9 * (1 << 25);
+
+        $s = array();
+        $s[0] = ($h[0] >> 0) & 0xff;
+        $s[1] = ($h[0] >> 8) & 0xff;
+        $s[2] = ($h[0] >> 16) & 0xff;
+        $s[3] = (($h[0] >> 24) | ($h[1] << 2)) & 0xff;
+        $s[4] = ($h[1] >> 6) & 0xff;
+        $s[5] = ($h[1] >> 14) & 0xff;
+        $s[6] = (($h[1] >> 22) | ($h[2] << 3)) & 0xff;
+        $s[7] = ($h[2] >> 5) & 0xff;
+        $s[8] = ($h[2] >> 13) & 0xff;
+        $s[9] = (($h[2] >> 21) | ($h[3] << 5)) & 0xff;
+        $s[10] = ($h[3] >> 3) & 0xff;
+        $s[11] = ($h[3] >> 11) & 0xff;
+        $s[12] = (($h[3] >> 19) | ($h[4] << 6)) & 0xff;
+        $s[13] = ($h[4] >> 2) & 0xff;
+        $s[14] = ($h[4] >> 10) & 0xff;
+        $s[15] = ($h[4] >> 18) & 0xff;
+        $s[16] = ($h[5] >> 0) & 0xff;
+        $s[17] = ($h[5] >> 8) & 0xff;
+        $s[18] = ($h[5] >> 16) & 0xff;
+        $s[19] = (($h[5] >> 24) | ($h[6] << 1)) & 0xff;
+        $s[20] = ($h[6] >> 7) & 0xff;
+        $s[21] = ($h[6] >> 15) & 0xff;
+        $s[22] = (($h[6] >> 23) | ($h[7] << 3)) & 0xff;
+        $s[23] = ($h[7] >> 5) & 0xff;
+        $s[24] = ($h[7] >> 13) & 0xff;
+        $s[25] = (($h[7] >> 21) | ($h[8] << 4)) & 0xff;
+        $s[26] = ($h[8] >> 4) & 0xff;
+        $s[27] = ($h[8] >> 12) & 0xff;
+        $s[28] = (($h[8] >> 20) | ($h[9] << 6)) & 0xff;
+        $s[29] = ($h[9] >> 2) & 0xff;
+        $s[30] = ($h[9] >> 10) & 0xff;
+        $s[31] = ($h[9] >> 18) & 0xff;
+
+        return self::intArrayToString($s);
+    }
+
+    /**
+     * Is a field element negative? (1 = yes, 0 = no. Used in calculations.)
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return int
+     */
+    public static function fe_isnegative(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $str = self::fe_tobytes($f);
+        return self::chrToInt($str[0]) & 1;
+    }
+
+    /**
+     * Returns 0 if this field element results in all NUL bytes.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return bool
+     */
+    public static function fe_isnonzero(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        static $zero;
+        if ($zero === null) {
+            $zero = str_repeat("\x00", 32);
+        }
+        $str = self::fe_tobytes($f);
+        return !self::verify_32($str, $zero);
+    }
+
+    /**
+     * Multiply two field elements
+     *
+     * h = f * g
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_mul(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g
+    ) {
+        $f0 = $f[0];
+        $f1 = $f[1];
+        $f2 = $f[2];
+        $f3 = $f[3];
+        $f4 = $f[4];
+        $f5 = $f[5];
+        $f6 = $f[6];
+        $f7 = $f[7];
+        $f8 = $f[8];
+        $f9 = $f[9];
+        $g0 = $g[0];
+        $g1 = $g[1];
+        $g2 = $g[2];
+        $g3 = $g[3];
+        $g4 = $g[4];
+        $g5 = $g[5];
+        $g6 = $g[6];
+        $g7 = $g[7];
+        $g8 = $g[8];
+        $g9 = $g[9];
+        $g1_19 = 19 * $g1;
+        $g2_19 = 19 * $g2;
+        $g3_19 = 19 * $g3;
+        $g4_19 = 19 * $g4;
+        $g5_19 = 19 * $g5;
+        $g6_19 = 19 * $g6;
+        $g7_19 = 19 * $g7;
+        $g8_19 = 19 * $g8;
+        $g9_19 = 19 * $g9;
+        $f1_2 = 2 * $f1;
+        $f3_2 = 2 * $f3;
+        $f5_2 = 2 * $f5;
+        $f7_2 = 2 * $f7;
+        $f9_2 = 2 * $f9;
+        $f0g0    = $f0   * $g0;
+        $f0g1    = $f0   * $g1;
+        $f0g2    = $f0   * $g2;
+        $f0g3    = $f0   * $g3;
+        $f0g4    = $f0   * $g4;
+        $f0g5    = $f0   * $g5;
+        $f0g6    = $f0   * $g6;
+        $f0g7    = $f0   * $g7;
+        $f0g8    = $f0   * $g8;
+        $f0g9    = $f0   * $g9;
+        $f1g0    = $f1   * $g0;
+        $f1g1_2  = $f1_2 * $g1;
+        $f1g2    = $f1   * $g2;
+        $f1g3_2  = $f1_2 * $g3;
+        $f1g4    = $f1   * $g4;
+        $f1g5_2  = $f1_2 * $g5;
+        $f1g6    = $f1   * $g6;
+        $f1g7_2  = $f1_2 * $g7;
+        $f1g8    = $f1   * $g8;
+        $f1g9_38 = $f1_2 * $g9_19;
+        $f2g0    = $f2   * $g0;
+        $f2g1    = $f2   * $g1;
+        $f2g2    = $f2   * $g2;
+        $f2g3    = $f2   * $g3;
+        $f2g4    = $f2   * $g4;
+        $f2g5    = $f2   * $g5;
+        $f2g6    = $f2   * $g6;
+        $f2g7    = $f2   * $g7;
+        $f2g8_19 = $f2   * $g8_19;
+        $f2g9_19 = $f2   * $g9_19;
+        $f3g0    = $f3   * $g0;
+        $f3g1_2  = $f3_2 * $g1;
+        $f3g2    = $f3   * $g2;
+        $f3g3_2  = $f3_2 * $g3;
+        $f3g4    = $f3   * $g4;
+        $f3g5_2  = $f3_2 * $g5;
+        $f3g6    = $f3   * $g6;
+        $f3g7_38 = $f3_2 * $g7_19;
+        $f3g8_19 = $f3   * $g8_19;
+        $f3g9_38 = $f3_2 * $g9_19;
+        $f4g0    = $f4   * $g0;
+        $f4g1    = $f4   * $g1;
+        $f4g2    = $f4   * $g2;
+        $f4g3    = $f4   * $g3;
+        $f4g4    = $f4   * $g4;
+        $f4g5    = $f4   * $g5;
+        $f4g6_19 = $f4   * $g6_19;
+        $f4g7_19 = $f4   * $g7_19;
+        $f4g8_19 = $f4   * $g8_19;
+        $f4g9_19 = $f4   * $g9_19;
+        $f5g0    = $f5   * $g0;
+        $f5g1_2  = $f5_2 * $g1;
+        $f5g2    = $f5   * $g2;
+        $f5g3_2  = $f5_2 * $g3;
+        $f5g4    = $f5   * $g4;
+        $f5g5_38 = $f5_2 * $g5_19;
+        $f5g6_19 = $f5   * $g6_19;
+        $f5g7_38 = $f5_2 * $g7_19;
+        $f5g8_19 = $f5   * $g8_19;
+        $f5g9_38 = $f5_2 * $g9_19;
+        $f6g0    = $f6   * $g0;
+        $f6g1    = $f6   * $g1;
+        $f6g2    = $f6   * $g2;
+        $f6g3    = $f6   * $g3;
+        $f6g4_19 = $f6   * $g4_19;
+        $f6g5_19 = $f6   * $g5_19;
+        $f6g6_19 = $f6   * $g6_19;
+        $f6g7_19 = $f6   * $g7_19;
+        $f6g8_19 = $f6   * $g8_19;
+        $f6g9_19 = $f6   * $g9_19;
+        $f7g0    = $f7   * $g0;
+        $f7g1_2  = $f7_2 * $g1;
+        $f7g2    = $f7   * $g2;
+        $f7g3_38 = $f7_2 * $g3_19;
+        $f7g4_19 = $f7   * $g4_19;
+        $f7g5_38 = $f7_2 * $g5_19;
+        $f7g6_19 = $f7   * $g6_19;
+        $f7g7_38 = $f7_2 * $g7_19;
+        $f7g8_19 = $f7   * $g8_19;
+        $f7g9_38 = $f7_2 * $g9_19;
+        $f8g0    = $f8   * $g0;
+        $f8g1    = $f8   * $g1;
+        $f8g2_19 = $f8   * $g2_19;
+        $f8g3_19 = $f8   * $g3_19;
+        $f8g4_19 = $f8   * $g4_19;
+        $f8g5_19 = $f8   * $g5_19;
+        $f8g6_19 = $f8   * $g6_19;
+        $f8g7_19 = $f8   * $g7_19;
+        $f8g8_19 = $f8   * $g8_19;
+        $f8g9_19 = $f8   * $g9_19;
+        $f9g0    = $f9   * $g0;
+        $f9g1_38 = $f9_2 * $g1_19;
+        $f9g2_19 = $f9   * $g2_19;
+        $f9g3_38 = $f9_2 * $g3_19;
+        $f9g4_19 = $f9   * $g4_19;
+        $f9g5_38 = $f9_2 * $g5_19;
+        $f9g6_19 = $f9   * $g6_19;
+        $f9g7_38 = $f9_2 * $g7_19;
+        $f9g8_19 = $f9   * $g8_19;
+        $f9g9_38 = $f9_2 * $g9_19;
+        $h0 = $f0g0 + $f1g9_38 + $f2g8_19 + $f3g7_38 + $f4g6_19 + $f5g5_38 + $f6g4_19 + $f7g3_38 + $f8g2_19 + $f9g1_38;
+        $h1 = $f0g1 + $f1g0    + $f2g9_19 + $f3g8_19 + $f4g7_19 + $f5g6_19 + $f6g5_19 + $f7g4_19 + $f8g3_19 + $f9g2_19;
+        $h2 = $f0g2 + $f1g1_2  + $f2g0    + $f3g9_38 + $f4g8_19 + $f5g7_38 + $f6g6_19 + $f7g5_38 + $f8g4_19 + $f9g3_38;
+        $h3 = $f0g3 + $f1g2    + $f2g1    + $f3g0    + $f4g9_19 + $f5g8_19 + $f6g7_19 + $f7g6_19 + $f8g5_19 + $f9g4_19;
+        $h4 = $f0g4 + $f1g3_2  + $f2g2    + $f3g1_2  + $f4g0    + $f5g9_38 + $f6g8_19 + $f7g7_38 + $f8g6_19 + $f9g5_38;
+        $h5 = $f0g5 + $f1g4    + $f2g3    + $f3g2    + $f4g1    + $f5g0    + $f6g9_19 + $f7g8_19 + $f8g7_19 + $f9g6_19;
+        $h6 = $f0g6 + $f1g5_2  + $f2g4    + $f3g3_2  + $f4g2    + $f5g1_2  + $f6g0    + $f7g9_38 + $f8g8_19 + $f9g7_38;
+        $h7 = $f0g7 + $f1g6    + $f2g5    + $f3g4    + $f4g3    + $f5g2    + $f6g1    + $f7g0    + $f8g9_19 + $f9g8_19;
+        $h8 = $f0g8 + $f1g7_2  + $f2g6    + $f3g5_2  + $f4g4    + $f5g3_2  + $f6g2    + $f7g1_2  + $f8g0    + $f9g9_38;
+        $h9 = $f0g9 + $f1g8    + $f2g7    + $f3g6    + $f4g5    + $f5g4    + $f6g3    + $f7g2    + $f8g1    + $f9g0   ;
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+
+        $carry1 = ($h1 + (1<<24)) >> 25; $h2 += $carry1; $h1 -= $carry1 << 25;
+        $carry5 = ($h5 + (1<<24)) >> 25; $h6 += $carry5; $h5 -= $carry5 << 25;
+
+        $carry2 = ($h2 + (1<<25)) >> 26; $h3 += $carry2; $h2 -= $carry2 << 26;
+        $carry6 = ($h6 + (1<<25)) >> 26; $h7 += $carry6; $h6 -= $carry6 << 26;
+
+        $carry3 = ($h3 + (1<<24)) >> 25; $h4 += $carry3; $h3 -= $carry3 << 25;
+        $carry7 = ($h7 + (1<<24)) >> 25; $h8 += $carry7; $h7 -= $carry7 << 25;
+
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+        $carry8 = ($h8 + (1<<25)) >> 26; $h9 += $carry8; $h8 -= $carry8 << 26;
+
+        $carry9 = ($h9 + (1<<24)) >> 25; $h0 += $carry9 * 19; $h9 -= $carry9 << 25;
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * Get the negative values for each piece of the field element.
+     *
+     * h = -f
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_neg(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = new ParagonIE_Sodium_Core_Curve25519_Fe();
+        for ($i = 0; $i < 10; ++$i) {
+            $h[$i] = -1 * $f[$i];
+        }
+        return $h;
+    }
+
+    /**
+     * Square a field element
+     *
+     * h = f * f
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_sq(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+
+        $f0_2 = 2 * $f0;
+        $f1_2 = 2 * $f1;
+        $f2_2 = 2 * $f2;
+        $f3_2 = 2 * $f3;
+        $f4_2 = 2 * $f4;
+        $f5_2 = 2 * $f5;
+        $f6_2 = 2 * $f6;
+        $f7_2 = 2 * $f7;
+        $f5_38 = 38 * $f5;
+        $f6_19 = 19 * $f6;
+        $f7_38 = 38 * $f7;
+        $f8_19 = 19 * $f8;
+        $f9_38 = 38 * $f9;
+        $f0f0    = $f0   * $f0;
+        $f0f1_2  = $f0_2 * $f1;
+        $f0f2_2  = $f0_2 * $f2;
+        $f0f3_2  = $f0_2 * $f3;
+        $f0f4_2  = $f0_2 * $f4;
+        $f0f5_2  = $f0_2 * $f5;
+        $f0f6_2  = $f0_2 * $f6;
+        $f0f7_2  = $f0_2 * $f7;
+        $f0f8_2  = $f0_2 * $f8;
+        $f0f9_2  = $f0_2 * $f9;
+        $f1f1_2  = $f1_2 * $f1;
+        $f1f2_2  = $f1_2 * $f2;
+        $f1f3_4  = $f1_2 * $f3_2;
+        $f1f4_2  = $f1_2 * $f4;
+        $f1f5_4  = $f1_2 * $f5_2;
+        $f1f6_2  = $f1_2 * $f6;
+        $f1f7_4  = $f1_2 * $f7_2;
+        $f1f8_2  = $f1_2 * $f8;
+        $f1f9_76 = $f1_2 * $f9_38;
+        $f2f2    = $f2   * $f2;
+        $f2f3_2  = $f2_2 * $f3;
+        $f2f4_2  = $f2_2 * $f4;
+        $f2f5_2  = $f2_2 * $f5;
+        $f2f6_2  = $f2_2 * $f6;
+        $f2f7_2  = $f2_2 * $f7;
+        $f2f8_38 = $f2_2 * $f8_19;
+        $f2f9_38 = $f2   * $f9_38;
+        $f3f3_2  = $f3_2 * $f3;
+        $f3f4_2  = $f3_2 * $f4;
+        $f3f5_4  = $f3_2 * $f5_2;
+        $f3f6_2  = $f3_2 * $f6;
+        $f3f7_76 = $f3_2 * $f7_38;
+        $f3f8_38 = $f3_2 * $f8_19;
+        $f3f9_76 = $f3_2 * $f9_38;
+        $f4f4    = $f4   * $f4;
+        $f4f5_2  = $f4_2 * $f5;
+        $f4f6_38 = $f4_2 * $f6_19;
+        $f4f7_38 = $f4   * $f7_38;
+        $f4f8_38 = $f4_2 * $f8_19;
+        $f4f9_38 = $f4   * $f9_38;
+        $f5f5_38 = $f5   * $f5_38;
+        $f5f6_38 = $f5_2 * $f6_19;
+        $f5f7_76 = $f5_2 * $f7_38;
+        $f5f8_38 = $f5_2 * $f8_19;
+        $f5f9_76 = $f5_2 * $f9_38;
+        $f6f6_19 = $f6   * $f6_19;
+        $f6f7_38 = $f6   * $f7_38;
+        $f6f8_38 = $f6_2 * $f8_19;
+        $f6f9_38 = $f6   * $f9_38;
+        $f7f7_38 = $f7   * $f7_38;
+        $f7f8_38 = $f7_2 * $f8_19;
+        $f7f9_76 = $f7_2 * $f9_38;
+        $f8f8_19 = $f8   * $f8_19;
+        $f8f9_38 = $f8   * $f9_38;
+        $f9f9_38 = $f9   * $f9_38;
+        $h0 = $f0f0   + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38;
+        $h1 = $f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38;
+        $h2 = $f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19;
+        $h3 = $f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38;
+        $h4 = $f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38;
+        $h5 = $f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38;
+        $h6 = $f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19;
+        $h7 = $f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38;
+        $h8 = $f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38;
+        $h9 = $f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2;
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+
+        $carry1 = ($h1 + (1<<24)) >> 25; $h2 += $carry1; $h1 -= $carry1 << 25;
+        $carry5 = ($h5 + (1<<24)) >> 25; $h6 += $carry5; $h5 -= $carry5 << 25;
+
+        $carry2 = ($h2 + (1<<25)) >> 26; $h3 += $carry2; $h2 -= $carry2 << 26;
+        $carry6 = ($h6 + (1<<25)) >> 26; $h7 += $carry6; $h6 -= $carry6 << 26;
+
+        $carry3 = ($h3 + (1<<24)) >> 25; $h4 += $carry3; $h3 -= $carry3 << 25;
+        $carry7 = ($h7 + (1<<24)) >> 25; $h8 += $carry7; $h7 -= $carry7 << 25;
+
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+        $carry8 = ($h8 + (1<<25)) >> 26; $h9 += $carry8; $h8 -= $carry8 << 26;
+
+        $carry9 = ($h9 + (1<<24)) >> 25; $h0 += $carry9 * 19; $h9 -= $carry9 << 25;
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+
+    /**
+     * Square and double a field element
+     *
+     * h = 2 * f * f
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_sq2(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+
+        $f0_2 = 2 * $f0;
+        $f1_2 = 2 * $f1;
+        $f2_2 = 2 * $f2;
+        $f3_2 = 2 * $f3;
+        $f4_2 = 2 * $f4;
+        $f5_2 = 2 * $f5;
+        $f6_2 = 2 * $f6;
+        $f7_2 = 2 * $f7;
+        $f5_38 = 38 * $f5; /* 1.959375*2^30 */
+        $f6_19 = 19 * $f6; /* 1.959375*2^30 */
+        $f7_38 = 38 * $f7; /* 1.959375*2^30 */
+        $f8_19 = 19 * $f8; /* 1.959375*2^30 */
+        $f9_38 = 38 * $f9; /* 1.959375*2^30 */
+        $f0f0 = $f0 * (int) $f0;
+        $f0f1_2 = $f0_2 * (int) $f1;
+        $f0f2_2 = $f0_2 * (int) $f2;
+        $f0f3_2 = $f0_2 * (int) $f3;
+        $f0f4_2 = $f0_2 * (int) $f4;
+        $f0f5_2 = $f0_2 * (int) $f5;
+        $f0f6_2 = $f0_2 * (int) $f6;
+        $f0f7_2 = $f0_2 * (int) $f7;
+        $f0f8_2 = $f0_2 * (int) $f8;
+        $f0f9_2 = $f0_2 * (int) $f9;
+        $f1f1_2 = $f1_2 * (int) $f1;
+        $f1f2_2 = $f1_2 * (int) $f2;
+        $f1f3_4 = $f1_2 * (int) $f3_2;
+        $f1f4_2 = $f1_2 * (int) $f4;
+        $f1f5_4 = $f1_2 * (int) $f5_2;
+        $f1f6_2 = $f1_2 * (int) $f6;
+        $f1f7_4 = $f1_2 * (int) $f7_2;
+        $f1f8_2 = $f1_2 * (int) $f8;
+        $f1f9_76 = $f1_2 * (int) $f9_38;
+        $f2f2 = $f2 * (int) $f2;
+        $f2f3_2 = $f2_2 * (int) $f3;
+        $f2f4_2 = $f2_2 * (int) $f4;
+        $f2f5_2 = $f2_2 * (int) $f5;
+        $f2f6_2 = $f2_2 * (int) $f6;
+        $f2f7_2 = $f2_2 * (int) $f7;
+        $f2f8_38 = $f2_2 * (int) $f8_19;
+        $f2f9_38 = $f2 * (int) $f9_38;
+        $f3f3_2 = $f3_2 * (int) $f3;
+        $f3f4_2 = $f3_2 * (int) $f4;
+        $f3f5_4 = $f3_2 * (int) $f5_2;
+        $f3f6_2 = $f3_2 * (int) $f6;
+        $f3f7_76 = $f3_2 * (int) $f7_38;
+        $f3f8_38 = $f3_2 * (int) $f8_19;
+        $f3f9_76 = $f3_2 * (int) $f9_38;
+        $f4f4 = $f4 * (int) $f4;
+        $f4f5_2 = $f4_2 * (int) $f5;
+        $f4f6_38 = $f4_2 * (int) $f6_19;
+        $f4f7_38 = $f4 * (int) $f7_38;
+        $f4f8_38 = $f4_2 * (int) $f8_19;
+        $f4f9_38 = $f4 * (int) $f9_38;
+        $f5f5_38 = $f5 * (int) $f5_38;
+        $f5f6_38 = $f5_2 * (int) $f6_19;
+        $f5f7_76 = $f5_2 * (int) $f7_38;
+        $f5f8_38 = $f5_2 * (int) $f8_19;
+        $f5f9_76 = $f5_2 * (int) $f9_38;
+        $f6f6_19 = $f6 * (int) $f6_19;
+        $f6f7_38 = $f6 * (int) $f7_38;
+        $f6f8_38 = $f6_2 * (int) $f8_19;
+        $f6f9_38 = $f6 * (int) $f9_38;
+        $f7f7_38 = $f7 * (int) $f7_38;
+        $f7f8_38 = $f7_2 * (int) $f8_19;
+        $f7f9_76 = $f7_2 * (int) $f9_38;
+        $f8f8_19 = $f8 * (int) $f8_19;
+        $f8f9_38 = $f8 * (int) $f9_38;
+        $f9f9_38 = $f9 * (int) $f9_38;
+
+        $h0 = (int) ($f0f0 + $f1f9_76 + $f2f8_38 + $f3f7_76 + $f4f6_38 + $f5f5_38);
+        $h1 = (int) ($f0f1_2 + $f2f9_38 + $f3f8_38 + $f4f7_38 + $f5f6_38);
+        $h2 = (int) ($f0f2_2 + $f1f1_2  + $f3f9_76 + $f4f8_38 + $f5f7_76 + $f6f6_19);
+        $h3 = (int) ($f0f3_2 + $f1f2_2  + $f4f9_38 + $f5f8_38 + $f6f7_38);
+        $h4 = (int) ($f0f4_2 + $f1f3_4  + $f2f2    + $f5f9_76 + $f6f8_38 + $f7f7_38);
+        $h5 = (int) ($f0f5_2 + $f1f4_2  + $f2f3_2  + $f6f9_38 + $f7f8_38);
+        $h6 = (int) ($f0f6_2 + $f1f5_4  + $f2f4_2  + $f3f3_2  + $f7f9_76 + $f8f8_19);
+        $h7 = (int) ($f0f7_2 + $f1f6_2  + $f2f5_2  + $f3f4_2  + $f8f9_38);
+        $h8 = (int) ($f0f8_2 + $f1f7_4  + $f2f6_2  + $f3f5_4  + $f4f4    + $f9f9_38);
+        $h9 = (int) ($f0f9_2 + $f1f8_2  + $f2f7_2  + $f3f6_2  + $f4f5_2);
+
+        $h0 = (int) ($h0 + $h0);
+        $h1 = (int) ($h1 + $h1);
+        $h2 = (int) ($h2 + $h2);
+        $h3 = (int) ($h3 + $h3);
+        $h4 = (int) ($h4 + $h4);
+        $h5 = (int) ($h5 + $h5);
+        $h6 = (int) ($h6 + $h6);
+        $h7 = (int) ($h7 + $h7);
+        $h8 = (int) ($h8 + $h8);
+        $h9 = (int) ($h9 + $h9);
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+
+        $carry1 = ($h1 + (1<<24)) >> 25; $h2 += $carry1; $h1 -= $carry1 << 25;
+        $carry5 = ($h5 + (1<<24)) >> 25; $h6 += $carry5; $h5 -= $carry5 << 25;
+
+        $carry2 = ($h2 + (1<<25)) >> 26; $h3 += $carry2; $h2 -= $carry2 << 26;
+        $carry6 = ($h6 + (1<<25)) >> 26; $h7 += $carry6; $h6 -= $carry6 << 26;
+
+        $carry3 = ($h3 + (1<<24)) >> 25; $h4 += $carry3; $h3 -= $carry3 << 25;
+        $carry7 = ($h7 + (1<<24)) >> 25; $h8 += $carry7; $h7 -= $carry7 << 25;
+
+        $carry4 = ($h4 + (1<<25)) >> 26; $h5 += $carry4; $h4 -= $carry4 << 26;
+        $carry8 = ($h8 + (1<<25)) >> 26; $h9 += $carry8; $h8 -= $carry8 << 26;
+
+        $carry9 = ($h9 + (1<<24)) >> 25; $h0 += $carry9 * 19; $h9 -= $carry9 << 25;
+
+        $carry0 = ($h0 + (1<<25)) >> 26; $h1 += $carry0; $h0 -= $carry0 << 26;
+
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) $h0,
+                (int) $h1,
+                (int) $h2,
+                (int) $h3,
+                (int) $h4,
+                (int) $h5,
+                (int) $h6,
+                (int) $h7,
+                (int) $h8,
+                (int) $h9
+            )
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $Z
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_invert(ParagonIE_Sodium_Core_Curve25519_Fe $Z)
+    {
+        $z = clone $Z;
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t2 = self::fe_sq($t0);
+        $t1 = self::fe_mul($t1, $t2);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 20; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 10; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t2 = self::fe_sq($t1);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t2 = self::fe_mul($t2, $t1);
+        $t3 = self::fe_sq($t2);
+        for ($i = 1; $i < 100; ++$i) {
+            $t3 = self::fe_sq($t3);
+        }
+        $t2 = self::fe_mul($t3, $t2);
+        $t2 = self::fe_sq($t2);
+        for ($i = 1; $i < 50; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+        return self::fe_mul($t1, $t0);
+    }
+
+    /**
+     * @ref https://github.com/jedisct1/libsodium/blob/68564326e1e9dc57ef03746f85734232d20ca6fb/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1054-L1106
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $z
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_pow22523(ParagonIE_Sodium_Core_Curve25519_Fe $z)
+    {
+        # fe_sq(t0, z);
+        # fe_sq(t1, t0);
+        # fe_sq(t1, t1);
+        # fe_mul(t1, z, t1);
+        # fe_mul(t0, t0, t1);
+        # fe_sq(t0, t0);
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_sq($z);
+        $t1 = self::fe_sq($t0);
+        $t1 = self::fe_sq($t1);
+        $t1 = self::fe_mul($z, $t1);
+        $t0 = self::fe_mul($t0, $t1);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 5; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 5; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 20; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 20; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 10; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 10; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t1, t0);
+        $t0 = self::fe_mul($t1, $t0);
+        $t1 = self::fe_sq($t0);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t1, t1, t0);
+        # fe_sq(t2, t1);
+        $t1 = self::fe_mul($t1, $t0);
+        $t2 = self::fe_sq($t1);
+
+        # for (i = 1; i < 100; ++i) {
+        #     fe_sq(t2, t2);
+        # }
+        for ($i = 1; $i < 100; ++$i) {
+            $t2 = self::fe_sq($t2);
+        }
+
+        # fe_mul(t1, t2, t1);
+        # fe_sq(t1, t1);
+        $t1 = self::fe_mul($t2, $t1);
+        $t1 = self::fe_sq($t1);
+
+        # for (i = 1; i < 50; ++i) {
+        #     fe_sq(t1, t1);
+        # }
+        for ($i = 1; $i < 50; ++$i) {
+            $t1 = self::fe_sq($t1);
+        }
+
+        # fe_mul(t0, t1, t0);
+        # fe_sq(t0, t0);
+        # fe_sq(t0, t0);
+        # fe_mul(out, t0, z);
+        $t0 = self::fe_mul($t1, $t0);
+        $t0 = self::fe_sq($t0);
+        $t0 = self::fe_sq($t0);
+        return self::fe_mul($t0, $z);
+    }
+
+    /**
+     * Subtract two field elements.
+     *
+     * h = f - g
+     *
+     * Preconditions:
+     * |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     * |g| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
+     *
+     * Postconditions:
+     * |h| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_sub(ParagonIE_Sodium_Core_Curve25519_Fe $f, ParagonIE_Sodium_Core_Curve25519_Fe $g)
+    {
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(
+            array(
+                (int) ($f[0] - $g[0]),
+                (int) ($f[1] - $g[1]),
+                (int) ($f[2] - $g[2]),
+                (int) ($f[3] - $g[3]),
+                (int) ($f[4] - $g[4]),
+                (int) ($f[5] - $g[5]),
+                (int) ($f[6] - $g[6]),
+                (int) ($f[7] - $g[7]),
+                (int) ($f[8] - $g[8]),
+                (int) ($f[9] - $g[9])
+            )
+        );
+    }
+
+    /**
+     * Add two group elements.
+     *
+     * r = p + q
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_add(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YplusX);
+        $r->Y = self::fe_mul($r->Y, $q->YminusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0 = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+        return $r;
+    }
+
+    /**
+     * @ref https://github.com/jedisct1/libsodium/blob/157c4a80c13b117608aeae12178b2d38825f9f8f/src/libsodium/crypto_core/curve25519/ref10/curve25519_ref10.c#L1185-L1215
+     * @param string $a
+     * @return int[]
+     */
+    public static function slide($a)
+    {
+        if (self::strlen($a) < 256) {
+            if (self::strlen($a) < 16) {
+                $a = str_pad($a, 256, '0', STR_PAD_RIGHT);
+            }
+        }
+        $r = array();
+        for ($i = 0; $i < 256; ++$i) {
+            $r[$i] = 1 & (
+                    self::chrToInt($a[$i >> 3])
+                        >>
+                    ($i & 7)
+                );
+        }
+
+        for ($i = 0;$i < 256;++$i) {
+            if ($r[$i]) {
+                for ($b = 1;$b <= 6 && $i + $b < 256;++$b) {
+                    if ($r[$i + $b]) {
+                        if ($r[$i] + ($r[$i + $b] << $b) <= 15) {
+                            $r[$i] += $r[$i + $b] << $b;
+                            $r[$i + $b] = 0;
+                        } else if ($r[$i] - ($r[$i + $b] << $b) >= -15) {
+                            $r[$i] -= $r[$i + $b] << $b;
+                            for ($k = $i + $b; $k < 256; ++$k) {
+                                if (!$r[$k]) {
+                                    $r[$k] = 1;
+                                    break;
+                                }
+                                $r[$k] = 0;
+                            }
+                        } else {
+                            break;
+                        }
+                    }
+                }
+            }
+        }
+        return $r;
+    }
+
+    /**
+     * @param string $s
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_frombytes_negate_vartime($s)
+    {
+        static $d = null;
+        if (!$d) {
+            $d = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d);
+        }
+
+        # fe_frombytes(h->Y,s);
+        # fe_1(h->Z);
+        $h = new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_frombytes($s),
+            self::fe_1()
+        );
+
+        # fe_sq(u,h->Y);
+        # fe_mul(v,u,d);
+        # fe_sub(u,u,h->Z);       /* u = y^2-1 */
+        # fe_add(v,v,h->Z);       /* v = dy^2+1 */
+        $u = self::fe_sq($h->Y);
+        $v = self::fe_mul($u, $d);
+        $u = self::fe_sub($u, $h->Z); /* u =  y^2 - 1 */
+        $v = self::fe_add($v, $h->Z); /* v = dy^2 + 1 */
+
+        # fe_sq(v3,v);
+        # fe_mul(v3,v3,v);        /* v3 = v^3 */
+        # fe_sq(h->X,v3);
+        # fe_mul(h->X,h->X,v);
+        # fe_mul(h->X,h->X,u);    /* x = uv^7 */
+        $v3 = self::fe_sq($v);
+        $v3 = self::fe_mul($v3, $v); /* v3 = v^3 */
+        $h->X = self::fe_sq($v3);
+        $h->X = self::fe_mul($h->X, $v);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^7 */
+
+        # fe_pow22523(h->X,h->X); /* x = (uv^7)^((q-5)/8) */
+        # fe_mul(h->X,h->X,v3);
+        # fe_mul(h->X,h->X,u);    /* x = uv^3(uv^7)^((q-5)/8) */
+        $h->X = self::fe_pow22523($h->X); /* x = (uv^7)^((q-5)/8) */
+        $h->X = self::fe_mul($h->X, $v3);
+        $h->X = self::fe_mul($h->X, $u); /* x = uv^3(uv^7)^((q-5)/8) */
+
+        # fe_sq(vxx,h->X);
+        # fe_mul(vxx,vxx,v);
+        # fe_sub(check,vxx,u);    /* vx^2-u */
+        $vxx = self::fe_sq($h->X);
+        $vxx = self::fe_mul($vxx, $v);
+        $check = self::fe_sub($vxx, $u); /* vx^2 - u */
+
+        # if (fe_isnonzero(check)) {
+        #     fe_add(check,vxx,u);  /* vx^2+u */
+        #     if (fe_isnonzero(check)) {
+        #         return -1;
+        #     }
+        #     fe_mul(h->X,h->X,sqrtm1);
+        # }
+        if (self::fe_isnonzero($check)) {
+            $check = self::fe_add($vxx, $u); /* vx^2 + u */
+            if (self::fe_isnonzero($check)) {
+                throw new RangeException('Internal check failed.');
+            }
+            $h->X = self::fe_mul(
+                $h->X,
+                ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$sqrtm1)
+            );
+        }
+
+        # if (fe_isnegative(h->X) == (s[31] >> 7)) {
+        #     fe_neg(h->X,h->X);
+        # }
+        $i = self::chrToInt($s[31]);
+        if (self::fe_isnegative($h->X) === ($i >> 7)) {
+            $h->X = self::fe_neg($h->X);
+        }
+
+        # fe_mul(h->T,h->X,h->Y);
+        $h->T = self::fe_mul($h->X, $h->Y);
+        return $h;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_madd(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yplusx);
+        $r->Y = self::fe_mul($r->Y, $q->yminusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add(clone $p->Z, clone $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_add($t0, $r->T);
+        $r->T = self::fe_sub($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_msub(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $R,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $q
+    ) {
+        $r = clone $R;
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->yminusx);
+        $r->Y = self::fe_mul($r->Y, $q->yplusx);
+        $r->T = self::fe_mul($q->xy2d, $p->T);
+        $t0 = self::fe_add($p->Z, $p->Z);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p1p1_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P2();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        return $r;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_p1p1_to_p3(ParagonIE_Sodium_Core_Curve25519_Ge_P1p1 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P3();
+        $r->X = self::fe_mul($p->X, $p->T);
+        $r->Y = self::fe_mul($p->Y, $p->Z);
+        $r->Z = self::fe_mul($p->Z, $p->T);
+        $r->T = self::fe_mul($p->X, $p->Y);
+        return $r;
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p2_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1()
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_p2_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $p)
+    {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_sq($p->X);
+        $r->Z = self::fe_sq($p->Y);
+        $r->T = self::fe_sq2($p->Z);
+        $r->Y = self::fe_add($p->X, $p->Y);
+        $t0 = self::fe_sq($r->Y);
+        $r->Y = self::fe_add($r->Z, $r->X);
+        $r->Z = self::fe_sub($r->Z, $r->X);
+        $r->X = self::fe_sub($t0, $r->Y);
+        $r->T = self::fe_sub($r->T, $r->Z);
+
+        return $r;
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_p3_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P3(
+            self::fe_0(),
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Cached
+     */
+    public static function ge_p3_to_cached(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        static $d2 = null;
+        if ($d2 === null) {
+            $d2 = ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$d2);
+        }
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached();
+        $r->YplusX = self::fe_add($p->Y, $p->X);
+        $r->YminusX = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_copy($p->Z);
+        $r->T2d = self::fe_mul($p->T, $d2);
+        return $r;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_p3_to_p2(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_P2(
+            $p->X,
+            $p->Y,
+            $p->Z
+        );
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h
+     * @return string
+     */
+    public static function ge_p3_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_p3_dbl(ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p)
+    {
+        $q = self::ge_p3_to_p2($p);
+        return self::ge_p2_dbl($q);
+    }
+
+    /**
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     */
+    public static function ge_precomp_0()
+    {
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_1(),
+            self::fe_1(),
+            self::fe_0()
+        );
+    }
+
+    /**
+     * @param int $b
+     * @param int $c
+     * @return int
+     */
+    public static function equal($b, $c)
+    {
+        return (($b ^ $c) - 1 & 0xffffffff) >> 31;
+    }
+
+    /**
+     * @param string $char
+     * @return int (1 = yes, 0 = no)
+     */
+    public static function negative($char)
+    {
+        if (is_int($char)) {
+            return $char < 0 ? 1 : 0;
+        }
+        $x = self::chrToInt(self::substr($char, 0, 1));
+        if (PHP_INT_SIZE === 8) {
+            return $x >> 63;
+        }
+        return $x >> 31;
+    }
+
+    /**
+     * Conditional move
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     */
+    public static function cmov(
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $t,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Precomp $u,
+        $b
+    ) {
+        if (!is_int($b)) {
+            throw new InvalidArgumentException('Expected an integer.');
+        }
+        return new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_cmov($t->yplusx, $u->yplusx, $b),
+            self::fe_cmov($t->yminusx, $u->yminusx, $b),
+            self::fe_cmov($t->xy2d, $u->xy2d, $b)
+        );
+    }
+
+    /**
+     * @param int $pos
+     * @param int $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_Precomp
+     */
+    public static function ge_select($pos = 0, $b = 0)
+    {
+        static $base = null;
+        if ($base === null) {
+            $base = array();
+            foreach (self::$base as $i => $bas) {
+                for ($j = 0; $j < 8; ++$j) {
+                    $base[$i][$j] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][0]),
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][1]),
+                        ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($bas[$j][2])
+                    );
+                }
+            }
+        }
+        if (!is_int($pos)) {
+            throw new InvalidArgumentException('Position must be an integer');
+        }
+        if ($pos < 0 || $pos > 31) {
+            throw new RangeException('Position is out of range [0, 31]');
+        }
+
+        $bnegative = self::negative($b);
+        $babs = $b - (((-$bnegative) & $b) << 1);
+
+        $t = self::ge_precomp_0();
+        for ($i = 0; $i < 8; ++$i) {
+            $t = self::cmov(
+                $t,
+                $base[$pos][$i],
+                self::equal($babs, $i + 1)
+            );
+        }
+        $minusT = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+            self::fe_copy($t->yminusx),
+            self::fe_copy($t->yplusx),
+            self::fe_neg($t->xy2d)
+        );
+        return self::cmov($t, $minusT, $bnegative);
+    }
+
+    /**
+     * Subtract two group elements.
+     *
+     * r = p - q
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P1p1
+     */
+    public static function ge_sub(
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $p,
+        ParagonIE_Sodium_Core_Curve25519_Ge_Cached $q
+    ) {
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        $r->X = self::fe_add($p->Y, $p->X);
+        $r->Y = self::fe_sub($p->Y, $p->X);
+        $r->Z = self::fe_mul($r->X, $q->YminusX);
+        $r->Y = self::fe_mul($r->Y, $q->YplusX);
+        $r->T = self::fe_mul($q->T2d, $p->T);
+        $r->X = self::fe_mul($p->Z, $q->Z);
+        $t0 = self::fe_add($r->X, $r->X);
+        $r->X = self::fe_sub($r->Z, $r->Y);
+        $r->Y = self::fe_add($r->Z, $r->Y);
+        $r->Z = self::fe_sub($t0, $r->T);
+        $r->T = self::fe_add($t0, $r->T);
+
+        return $r;
+    }
+
+    /**
+     * Convert a group element to a byte string.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h
+     * @return string
+     */
+    public static function ge_tobytes(ParagonIE_Sodium_Core_Curve25519_Ge_P2 $h)
+    {
+        $recip = self::fe_invert($h->Z);
+        $x = self::fe_mul($h->X, $recip);
+        $y = self::fe_mul($h->Y, $recip);
+        $s = self::fe_tobytes($y);
+        $s[31] = self::intToChr(
+            self::chrToInt($s[31]) ^ (self::fe_isnegative($x) << 7)
+        );
+        return $s;
+    }
+
+    /**
+     * @param string $a
+     * @param ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A
+     * @param string $b
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P2
+     */
+    public static function ge_double_scalarmult_vartime(
+        $a,
+        ParagonIE_Sodium_Core_Curve25519_Ge_P3 $A,
+        $b
+    ) {
+        /**
+         * @var ParagonIE_Sodium_Core_Curve25519_Ge_Cached[]
+         */
+        $Ai = array();
+
+        /**
+         * @var ParagonIE_Sodium_Core_Curve25519_Ge_Precomp[]
+         */
+        static $Bi = null;
+        if (!$Bi) {
+            for ($i = 0; $i < 8; ++$i) {
+                $Bi[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Precomp(
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][0]),
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][1]),
+                    ParagonIE_Sodium_Core_Curve25519_Fe::fromArray(self::$base2[$i][2])
+                );
+            }
+        }
+        for ($i = 0; $i < 8; ++$i) {
+            $Ai[$i] = new ParagonIE_Sodium_Core_Curve25519_Ge_Cached(
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0(),
+                self::fe_0()
+            );
+        }
+
+        # slide(aslide,a);
+        # slide(bslide,b);
+        $aslide = self::slide($a);
+        $bslide = self::slide($b);
+
+        # ge_p3_to_cached(&Ai[0],A);
+        # ge_p3_dbl(&t,A); ge_p1p1_to_p3(&A2,&t);
+        $Ai[0] = self::ge_p3_to_cached($A);
+        $t = self::ge_p3_dbl($A);
+        $A2 = self::ge_p1p1_to_p3($t);
+
+        # ge_add(&t,&A2,&Ai[0]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[1],&u);
+        # ge_add(&t,&A2,&Ai[1]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[2],&u);
+        # ge_add(&t,&A2,&Ai[2]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[3],&u);
+        # ge_add(&t,&A2,&Ai[3]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[4],&u);
+        # ge_add(&t,&A2,&Ai[4]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[5],&u);
+        # ge_add(&t,&A2,&Ai[5]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[6],&u);
+        # ge_add(&t,&A2,&Ai[6]); ge_p1p1_to_p3(&u,&t); ge_p3_to_cached(&Ai[7],&u);
+        for ($i = 0; $i < 7; ++$i) {
+            $t = self::ge_add($A2, $Ai[$i]);
+            $u = self::ge_p1p1_to_p3($t);
+            $Ai[$i + 1] = self::ge_p3_to_cached($u);
+        }
+
+        # ge_p2_0(r);
+        $r = self::ge_p2_0();
+
+        # for (i = 255;i >= 0;--i) {
+        #     if (aslide[i] || bslide[i]) break;
+        # }
+        for ($i = 255; $i >= 0; --$i) {
+            if ($aslide[$i] || $bslide[$i]) {
+                break;
+            }
+        }
+
+        # for (;i >= 0;--i) {
+        for (; $i >= 0; --$i) {
+            # ge_p2_dbl(&t,r);
+            $t = self::ge_p2_dbl($r);
+
+            # if (aslide[i] > 0) {
+            if ($aslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_add(&t,&u,&Ai[aslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_add(
+                    $u,
+                    $Ai[(int) floor($aslide[$i] / 2)]
+                );
+            # } else if (aslide[i] < 0) {
+            } elseif ($aslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_sub(&t,&u,&Ai[(-aslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_sub(
+                    $u,
+                    $Ai[(int) floor(-$aslide[$i] / 2)]
+                );
+            }
+
+            # if (bslide[i] > 0) {
+            if ($bslide[$i] > 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_madd(&t,&u,&Bi[bslide[i]/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_madd(
+                    $t,
+                    $u,
+                    $Bi[(int) floor($bslide[$i] / 2)]
+                );
+            # } else if (bslide[i] < 0) {
+            } elseif ($bslide[$i] < 0) {
+                # ge_p1p1_to_p3(&u,&t);
+                # ge_msub(&t,&u,&Bi[(-bslide[i])/2]);
+                $u = self::ge_p1p1_to_p3($t);
+                $t = self::ge_msub(
+                    $t,
+                    $u,
+                    $Bi[(int) floor(-$bslide[$i] / 2)]
+                );
+            }
+            # ge_p1p1_to_p2(r,&t);
+            $r = self::ge_p1p1_to_p2($t);
+        }
+        return $r;
+    }
+
+    /**
+     * @param string $a
+     * @return ParagonIE_Sodium_Core_Curve25519_Ge_P3
+     */
+    public static function ge_scalarmult_base($a)
+    {
+        $e = array();
+        $r = new ParagonIE_Sodium_Core_Curve25519_Ge_P1p1();
+
+        for ($i = 0; $i < 32; ++$i) {
+            $e[2 * $i] = self::chrToInt($a[$i]) & 15;
+            $e[2 * $i + 1] = (self::chrToInt($a[$i]) >> 4) & 15;
+        }
+
+        $carry = 0;
+        for ($i = 0; $i < 63; ++$i) {
+            $e[$i] += $carry;
+            $carry = $e[$i] + 8;
+            $carry >>= 4;
+            $e[$i] -= $carry << 4;
+        }
+        $e[63] += $carry;
+
+        $h = self::ge_p3_0();
+
+        for ($i = 1; $i < 64; $i += 2) {
+            $t = self::ge_select((int) floor($i / 2), $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+
+        $r = self::ge_p3_dbl($h);
+
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+        $s = self::ge_p1p1_to_p2($r);
+        $r = self::ge_p2_dbl($s);
+
+        $h = self::ge_p1p1_to_p3($r);
+
+        for ($i = 0; $i < 64; $i += 2) {
+            $t = self::ge_select((int) floor($i / 2), $e[$i]);
+            $r = self::ge_madd($r, $h, $t);
+            $h = self::ge_p1p1_to_p3($r);
+        }
+        return $h;
+    }
+
+    /**
+     * Calculates (ab + c) mod l
+     * where l = 2^252 + 27742317777372353535851937790883648493
+     *
+     * @param string $a
+     * @param string $b
+     * @param string $c
+     * @return string
+     */
+    public static function sc_muladd($a, $b, $c)
+    {
+        $a0 = 2097151 & self::load_3(self::substr($a, 0, 3));
+        $a1 = 2097151 & (self::load_4(self::substr($a, 2, 4)) >> 5);
+        $a2 = 2097151 & (self::load_3(self::substr($a, 5, 3)) >> 2);
+        $a3 = 2097151 & (self::load_4(self::substr($a, 7, 4)) >> 7);
+        $a4 = 2097151 & (self::load_4(self::substr($a, 10, 4)) >> 4);
+        $a5 = 2097151 & (self::load_3(self::substr($a, 13, 3)) >> 1);
+        $a6 = 2097151 & (self::load_4(self::substr($a, 15, 4)) >> 6);
+        $a7 = 2097151 & (self::load_3(self::substr($a, 18, 3)) >> 3);
+        $a8 = 2097151 & self::load_3(self::substr($a, 21, 3));
+        $a9 = 2097151 & (self::load_4(self::substr($a, 23, 4)) >> 5);
+        $a10 = 2097151 & (self::load_3(self::substr($a, 26, 3)) >> 2);
+        $a11 = (self::load_4(self::substr($a, 28, 4)) >> 7);
+        $b0 = 2097151 & self::load_3(self::substr($b, 0, 3));
+        $b1 = 2097151 & (self::load_4(self::substr($b, 2, 4)) >> 5);
+        $b2 = 2097151 & (self::load_3(self::substr($b, 5, 3)) >> 2);
+        $b3 = 2097151 & (self::load_4(self::substr($b, 7, 4)) >> 7);
+        $b4 = 2097151 & (self::load_4(self::substr($b, 10, 4)) >> 4);
+        $b5 = 2097151 & (self::load_3(self::substr($b, 13, 3)) >> 1);
+        $b6 = 2097151 & (self::load_4(self::substr($b, 15, 4)) >> 6);
+        $b7 = 2097151 & (self::load_3(self::substr($b, 18, 3)) >> 3);
+        $b8 = 2097151 & self::load_3(self::substr($b, 21, 3));
+        $b9 = 2097151 & (self::load_4(self::substr($b, 23, 4)) >> 5);
+        $b10 = 2097151 & (self::load_3(self::substr($b, 26, 3)) >> 2);
+        $b11 = (self::load_4(self::substr($b, 28, 4)) >> 7);
+        $c0 = 2097151 & self::load_3(self::substr($c, 0, 3));
+        $c1 = 2097151 & (self::load_4(self::substr($c, 2, 4)) >> 5);
+        $c2 = 2097151 & (self::load_3(self::substr($c, 5, 3)) >> 2);
+        $c3 = 2097151 & (self::load_4(self::substr($c, 7, 4)) >> 7);
+        $c4 = 2097151 & (self::load_4(self::substr($c, 10, 4)) >> 4);
+        $c5 = 2097151 & (self::load_3(self::substr($c, 13, 3)) >> 1);
+        $c6 = 2097151 & (self::load_4(self::substr($c, 15, 4)) >> 6);
+        $c7 = 2097151 & (self::load_3(self::substr($c, 18, 3)) >> 3);
+        $c8 = 2097151 & self::load_3(self::substr($c, 21, 3));
+        $c9 = 2097151 & (self::load_4(self::substr($c, 23, 4)) >> 5);
+        $c10 = 2097151 & (self::load_3(self::substr($c, 26, 3)) >> 2);
+        $c11 = (self::load_4(self::substr($c, 28, 4)) >> 7);
+
+        $s0 = $c0 + $a0 * $b0;
+        $s1 = $c1 + $a0 * $b1 + $a1 * $b0;
+        $s2 = $c2 + $a0 * $b2 + $a1 * $b1 + $a2 * $b0;
+        $s3 = $c3 + $a0 * $b3 + $a1 * $b2 + $a2 * $b1 + $a3 * $b0;
+        $s4 = $c4 + $a0 * $b4 + $a1 * $b3 + $a2 * $b2 + $a3 * $b1 + $a4 * $b0;
+        $s5 = $c5 + $a0 * $b5 + $a1 * $b4 + $a2 * $b3 + $a3 * $b2 + $a4 * $b1 + $a5 * $b0;
+        $s6 = $c6 + $a0 * $b6 + $a1 * $b5 + $a2 * $b4 + $a3 * $b3 + $a4 * $b2 + $a5 * $b1 + $a6 * $b0;
+        $s7 = $c7 + $a0 * $b7 + $a1 * $b6 + $a2 * $b5 + $a3 * $b4 + $a4 * $b3 + $a5 * $b2 + $a6 * $b1 + $a7 * $b0;
+        $s8 = $c8 + $a0 * $b8 + $a1 * $b7 + $a2 * $b6 + $a3 * $b5 + $a4 * $b4 + $a5 * $b3 + $a6 * $b2 + $a7 * $b1 + $a8 * $b0;
+        $s9 = $c9 + $a0 * $b9 + $a1 * $b8 + $a2 * $b7 + $a3 * $b6 + $a4 * $b5 + $a5 * $b4 + $a6 * $b3 + $a7 * $b2 + $a8 * $b1 + $a9 * $b0;
+        $s10 = $c10 + $a0 * $b10 + $a1 * $b9 + $a2 * $b8 + $a3 * $b7 + $a4 * $b6 + $a5 * $b5 + $a6 * $b4 + $a7 * $b3 + $a8 * $b2 + $a9 * $b1 + $a10 * $b0;
+        $s11 = $c11 + $a0 * $b11 + $a1 * $b10 + $a2 * $b9 + $a3 * $b8 + $a4 * $b7 + $a5 * $b6 + $a6 * $b5 + $a7 * $b4 + $a8 * $b3 + $a9 * $b2 + $a10 * $b1 + $a11 * $b0;
+        $s12 = $a1 * $b11 + $a2 * $b10 + $a3 * $b9 + $a4 * $b8 + $a5 * $b7 + $a6 * $b6 + $a7 * $b5 + $a8 * $b4 + $a9 * $b3 + $a10 * $b2 + $a11 * $b1;
+        $s13 = $a2 * $b11 + $a3 * $b10 + $a4 * $b9 + $a5 * $b8 + $a6 * $b7 + $a7 * $b6 + $a8 * $b5 + $a9 * $b4 + $a10 * $b3 + $a11 * $b2;
+        $s14 = $a3 * $b11 + $a4 * $b10 + $a5 * $b9 + $a6 * $b8 + $a7 * $b7 + $a8 * $b6 + $a9 * $b5 + $a10 * $b4 + $a11 * $b3;
+        $s15 = $a4 * $b11 + $a5 * $b10 + $a6 * $b9 + $a7 * $b8 + $a8 * $b7 + $a9 * $b6 + $a10 * $b5 + $a11 * $b4;
+        $s16 = $a5 * $b11 + $a6 * $b10 + $a7 * $b9 + $a8 * $b8 + $a9 * $b7 + $a10 * $b6 + $a11 * $b5;
+        $s17 = $a6 * $b11 + $a7 * $b10 + $a8 * $b9 + $a9 * $b8 + $a10 * $b7 + $a11 * $b6;
+        $s18 = $a7 * $b11 + $a8 * $b10 + $a9 * $b9 + $a10 * $b8 + $a11 * $b7;
+        $s19 = $a8 * $b11 + $a9 * $b10 + $a10 * $b9 + $a11 * $b8;
+        $s20 = $a9 * $b11 + $a10 * $b10 + $a11 * $b9;
+        $s21 = $a10 * $b11 + $a11 * $b10;
+        $s22 = $a11 * $b11;
+        $s23 = 0;
+
+
+        $carry0 = ($s0 + (1 << 20)) >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry2 = ($s2 + (1 << 20)) >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry4 = ($s4 + (1 << 20)) >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+        $carry12 = ($s12 + (1 << 20)) >> 21; $s13 += $carry12; $s12 -= $carry12 * (1 << 21);
+        $carry14 = ($s14 + (1 << 20)) >> 21; $s15 += $carry14; $s14 -= $carry14 * (1 << 21);
+        $carry16 = ($s16 + (1 << 20)) >> 21; $s17 += $carry16; $s16 -= $carry16 * (1 << 21);
+        $carry18 = ($s18 + (1 << 20)) >> 21; $s19 += $carry18; $s18 -= $carry18 * (1 << 21);
+        $carry20 = ($s20 + (1 << 20)) >> 21; $s21 += $carry20; $s20 -= $carry20 * (1 << 21);
+        $carry22 = ($s22 + (1 << 20)) >> 21; $s23 += $carry22; $s22 -= $carry22 * (1 << 21);
+
+        $carry1 = ($s1 + (1 << 20)) >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry3 = ($s3 + (1 << 20)) >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry5 = ($s5 + (1 << 20)) >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+        $carry13 = ($s13 + (1 << 20)) >> 21; $s14 += $carry13; $s13 -= $carry13 * (1 << 21);
+        $carry15 = ($s15 + (1 << 20)) >> 21; $s16 += $carry15; $s15 -= $carry15 * (1 << 21);
+        $carry17 = ($s17 + (1 << 20)) >> 21; $s18 += $carry17; $s17 -= $carry17 * (1 << 21);
+        $carry19 = ($s19 + (1 << 20)) >> 21; $s20 += $carry19; $s19 -= $carry19 * (1 << 21);
+        $carry21 = ($s21 + (1 << 20)) >> 21; $s22 += $carry21; $s21 -= $carry21 * (1 << 21);
+
+        $s11 += $s23 * 666643;
+        $s12 += $s23 * 470296;
+        $s13 += $s23 * 654183;
+        $s14 -= $s23 * 997805;
+        $s15 += $s23 * 136657;
+        $s16 -= $s23 * 683901;
+
+        $s10 += $s22 * 666643;
+        $s11 += $s22 * 470296;
+        $s12 += $s22 * 654183;
+        $s13 -= $s22 * 997805;
+        $s14 += $s22 * 136657;
+        $s15 -= $s22 * 683901;
+
+        $s9 += $s21 * 666643;
+        $s10 += $s21 * 470296;
+        $s11 += $s21 * 654183;
+        $s12 -= $s21 * 997805;
+        $s13 += $s21 * 136657;
+        $s14 -= $s21 * 683901;
+
+        $s8 += $s20 * 666643;
+        $s9 += $s20 * 470296;
+        $s10 += $s20 * 654183;
+        $s11 -= $s20 * 997805;
+        $s12 += $s20 * 136657;
+        $s13 -= $s20 * 683901;
+
+        $s7 += $s19 * 666643;
+        $s8 += $s19 * 470296;
+        $s9 += $s19 * 654183;
+        $s10 -= $s19 * 997805;
+        $s11 += $s19 * 136657;
+        $s12 -= $s19 * 683901;
+
+        $s6 += $s18 * 666643;
+        $s7 += $s18 * 470296;
+        $s8 += $s18 * 654183;
+        $s9 -= $s18 * 997805;
+        $s10 += $s18 * 136657;
+        $s11 -= $s18 * 683901;
+
+        $carry6 = ($s6 + (1 << 20)) >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+        $carry12 = ($s12 + (1 << 20)) >> 21; $s13 += $carry12; $s12 -= $carry12 * (1 << 21);
+        $carry14 = ($s14 + (1 << 20)) >> 21; $s15 += $carry14; $s14 -= $carry14 * (1 << 21);
+        $carry16 = ($s16 + (1 << 20)) >> 21; $s17 += $carry16; $s16 -= $carry16 * (1 << 21);
+
+        $carry7 = ($s7 + (1 << 20)) >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+        $carry13 = ($s13 + (1 << 20)) >> 21; $s14 += $carry13; $s13 -= $carry13 * (1 << 21);
+        $carry15 = ($s15 + (1 << 20)) >> 21; $s16 += $carry15; $s15 -= $carry15 * (1 << 21);
+
+        $s5 += $s17 * 666643;
+        $s6 += $s17 * 470296;
+        $s7 += $s17 * 654183;
+        $s8 -= $s17 * 997805;
+        $s9 += $s17 * 136657;
+        $s10 -= $s17 * 683901;
+
+        $s4 += $s16 * 666643;
+        $s5 += $s16 * 470296;
+        $s6 += $s16 * 654183;
+        $s7 -= $s16 * 997805;
+        $s8 += $s16 * 136657;
+        $s9 -= $s16 * 683901;
+
+        $s3 += $s15 * 666643;
+        $s4 += $s15 * 470296;
+        $s5 += $s15 * 654183;
+        $s6 -= $s15 * 997805;
+        $s7 += $s15 * 136657;
+        $s8 -= $s15 * 683901;
+
+        $s2 += $s14 * 666643;
+        $s3 += $s14 * 470296;
+        $s4 += $s14 * 654183;
+        $s5 -= $s14 * 997805;
+        $s6 += $s14 * 136657;
+        $s7 -= $s14 * 683901;
+
+        $s1 += $s13 * 666643;
+        $s2 += $s13 * 470296;
+        $s3 += $s13 * 654183;
+        $s4 -= $s13 * 997805;
+        $s5 += $s13 * 136657;
+        $s6 -= $s13 * 683901;
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+        $s12 = 0;
+
+        $carry0 = ($s0 + (1 << 20)) >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry2 = ($s2 + (1 << 20)) >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry4 = ($s4 + (1 << 20)) >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+
+        $carry1 = ($s1 + (1 << 20)) >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry3 = ($s3 + (1 << 20)) >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry5 = ($s5 + (1 << 20)) >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+        $s12 = 0;
+
+        $carry0 = $s0 >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry1 = $s1 >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry2 = $s2 >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry3 = $s3 >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry4 = $s4 >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry5 = $s5 >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry6 = $s6 >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry7 = $s7 >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry8 = $s8 >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry9 = $s9 >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry10 = $s10 >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+        $carry11 = $s11 >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+
+        $carry0 = $s0 >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry1 = $s1 >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry2 = $s2 >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry3 = $s3 >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry4 = $s4 >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry5 = $s5 >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry6 = $s6 >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry7 = $s7 >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry8 = $s8 >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry9 = $s9 >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry10 = $s10 >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+
+        return self::intArrayToString(
+            array(
+                0xff & ($s0 >> 0),
+                0xff & ($s0 >> 8),
+                0xff & (($s0 >> 16) | ($s1 * (1 << 5))),
+                0xff & ($s1 >> 3),
+                0xff & ($s1 >> 11),
+                0xff & (($s1 >> 19) | ($s2 * (1 << 2))),
+                0xff & ($s2 >> 6),
+                0xff & (($s2 >> 14) | ($s3 * (1 << 7))),
+                0xff & ($s3 >> 1),
+                0xff & ($s3 >> 9),
+                0xff & (($s3 >> 17) | ($s4 * (1 << 4))),
+                0xff & ($s4 >> 4),
+                0xff & ($s4 >> 12),
+                0xff & (($s4 >> 20) | ($s5 * (1 << 1))),
+                0xff & ($s5 >> 7),
+                0xff & (($s5 >> 15) | ($s6 * (1 << 6))),
+                0xff & ($s6 >> 2),
+                0xff & ($s6 >> 10),
+                0xff & (($s6 >> 18) | ($s7 * (1 << 3))),
+                0xff & ($s7 >> 5),
+                0xff & ($s7 >> 13),
+                0xff & ($s8 >> 0),
+                0xff & ($s8 >> 8),
+                0xff & (($s8 >> 16) | ($s9 * (1 << 5))),
+                0xff & ($s9 >> 3),
+                0xff & ($s9 >> 11),
+                0xff & (($s9 >> 19) | ($s10 * (1 << 2))),
+                0xff & ($s10 >> 6),
+                0xff & (($s10 >> 14) | ($s11 * (1 << 7))),
+                0xff & ($s11 >> 1),
+                0xff & ($s11 >> 9),
+                0xff & ($s11 >> 17)
+            )
+        );
+    }
+
+    /**
+     * @param string $s
+     * @return string
+     */
+    public static function sc_reduce($s)
+    {
+        $s0 = 2097151 & self::load_3(self::substr($s, 0, 3));
+        $s1 = 2097151 & (self::load_4(self::substr($s, 2, 4)) >> 5);
+        $s2 = 2097151 & (self::load_3(self::substr($s, 5, 3)) >> 2);
+        $s3 = 2097151 & (self::load_4(self::substr($s, 7, 4)) >> 7);
+        $s4 = 2097151 & (self::load_4(self::substr($s, 10, 4)) >> 4);
+        $s5 = 2097151 & (self::load_3(self::substr($s, 13, 3)) >> 1);
+        $s6 = 2097151 & (self::load_4(self::substr($s, 15, 4)) >> 6);
+        $s7 = 2097151 & (self::load_3(self::substr($s, 18, 4)) >> 3);
+        $s8 = 2097151 & self::load_3(self::substr($s, 21, 3));
+        $s9 = 2097151 & (self::load_4(self::substr($s, 23, 4)) >> 5);
+        $s10 = 2097151 & (self::load_3(self::substr($s, 26, 3)) >> 2);
+        $s11 = 2097151 & (self::load_4(self::substr($s, 28, 4)) >> 7);
+        $s12 = 2097151 & (self::load_4(self::substr($s, 31, 4)) >> 4);
+        $s13 = 2097151 & (self::load_3(self::substr($s, 34, 3)) >> 1);
+        $s14 = 2097151 & (self::load_4(self::substr($s, 36, 4)) >> 6);
+        $s15 = 2097151 & (self::load_3(self::substr($s, 39, 4)) >> 3);
+        $s16 = 2097151 & self::load_3(self::substr($s, 42, 3));
+        $s17 = 2097151 & (self::load_4(self::substr($s, 44, 4)) >> 5);
+        $s18 = 2097151 & (self::load_3(self::substr($s, 47, 3)) >> 2);
+        $s19 = 2097151 & (self::load_4(self::substr($s, 49, 4)) >> 7);
+        $s20 = 2097151 & (self::load_4(self::substr($s, 52, 4)) >> 4);
+        $s21 = 2097151 & (self::load_3(self::substr($s, 55, 3)) >> 1);
+        $s22 = 2097151 & (self::load_4(self::substr($s, 57, 4)) >> 6);
+        $s23 = (self::load_4(self::substr($s, 60, 4)) >> 3);
+
+        $s11 += $s23 * 666643;
+        $s12 += $s23 * 470296;
+        $s13 += $s23 * 654183;
+        $s14 -= $s23 * 997805;
+        $s15 += $s23 * 136657;
+        $s16 -= $s23 * 683901;
+
+        $s10 += $s22 * 666643;
+        $s11 += $s22 * 470296;
+        $s12 += $s22 * 654183;
+        $s13 -= $s22 * 997805;
+        $s14 += $s22 * 136657;
+        $s15 -= $s22 * 683901;
+
+        $s9 += $s21 * 666643;
+        $s10 += $s21 * 470296;
+        $s11 += $s21 * 654183;
+        $s12 -= $s21 * 997805;
+        $s13 += $s21 * 136657;
+        $s14 -= $s21 * 683901;
+
+        $s8 += $s20 * 666643;
+        $s9 += $s20 * 470296;
+        $s10 += $s20 * 654183;
+        $s11 -= $s20 * 997805;
+        $s12 += $s20 * 136657;
+        $s13 -= $s20 * 683901;
+
+        $s7 += $s19 * 666643;
+        $s8 += $s19 * 470296;
+        $s9 += $s19 * 654183;
+        $s10 -= $s19 * 997805;
+        $s11 += $s19 * 136657;
+        $s12 -= $s19 * 683901;
+
+        $s6 += $s18 * 666643;
+        $s7 += $s18 * 470296;
+        $s8 += $s18 * 654183;
+        $s9 -= $s18 * 997805;
+        $s10 += $s18 * 136657;
+        $s11 -= $s18 * 683901;
+
+        $carry6 = ($s6 + (1 << 20)) >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+        $carry12 = ($s12 + (1 << 20)) >> 21; $s13 += $carry12; $s12 -= $carry12 * (1 << 21);
+        $carry14 = ($s14 + (1 << 20)) >> 21; $s15 += $carry14; $s14 -= $carry14 * (1 << 21);
+        $carry16 = ($s16 + (1 << 20)) >> 21; $s17 += $carry16; $s16 -= $carry16 * (1 << 21);
+
+        $carry7 = ($s7 + (1 << 20)) >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+        $carry13 = ($s13 + (1 << 20)) >> 21; $s14 += $carry13; $s13 -= $carry13 * (1 << 21);
+        $carry15 = ($s15 + (1 << 20)) >> 21; $s16 += $carry15; $s15 -= $carry15 * (1 << 21);
+
+        $s5 += $s17 * 666643;
+        $s6 += $s17 * 470296;
+        $s7 += $s17 * 654183;
+        $s8 -= $s17 * 997805;
+        $s9 += $s17 * 136657;
+        $s10 -= $s17 * 683901;
+
+        $s4 += $s16 * 666643;
+        $s5 += $s16 * 470296;
+        $s6 += $s16 * 654183;
+        $s7 -= $s16 * 997805;
+        $s8 += $s16 * 136657;
+        $s9 -= $s16 * 683901;
+
+        $s3 += $s15 * 666643;
+        $s4 += $s15 * 470296;
+        $s5 += $s15 * 654183;
+        $s6 -= $s15 * 997805;
+        $s7 += $s15 * 136657;
+        $s8 -= $s15 * 683901;
+
+        $s2 += $s14 * 666643;
+        $s3 += $s14 * 470296;
+        $s4 += $s14 * 654183;
+        $s5 -= $s14 * 997805;
+        $s6 += $s14 * 136657;
+        $s7 -= $s14 * 683901;
+
+        $s1 += $s13 * 666643;
+        $s2 += $s13 * 470296;
+        $s3 += $s13 * 654183;
+        $s4 -= $s13 * 997805;
+        $s5 += $s13 * 136657;
+        $s6 -= $s13 * 683901;
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+        $s12 = 0;
+
+        $carry0 = ($s0 + (1 << 20)) >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry2 = ($s2 + (1 << 20)) >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry4 = ($s4 + (1 << 20)) >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry6 = ($s6 + (1 << 20)) >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry8 = ($s8 + (1 << 20)) >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry10 = ($s10 + (1 << 20)) >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+
+        $carry1 = ($s1 + (1 << 20)) >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry3 = ($s3 + (1 << 20)) >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry5 = ($s5 + (1 << 20)) >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry7 = ($s7 + (1 << 20)) >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry9 = ($s9 + (1 << 20)) >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry11 = ($s11 + (1 << 20)) >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+        $s12 = 0;
+
+        $carry0 = $s0 >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry1 = $s1 >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry2 = $s2 >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry3 = $s3 >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry4 = $s4 >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry5 = $s5 >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry6 = $s6 >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry7 = $s7 >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry8 = $s8 >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry9 = $s9 >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry10 = $s10 >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+        $carry11 = $s11 >> 21; $s12 += $carry11; $s11 -= $carry11 * (1 << 21);
+
+        $s0 += $s12 * 666643;
+        $s1 += $s12 * 470296;
+        $s2 += $s12 * 654183;
+        $s3 -= $s12 * 997805;
+        $s4 += $s12 * 136657;
+        $s5 -= $s12 * 683901;
+
+        $carry0 = $s0 >> 21; $s1 += $carry0; $s0 -= $carry0 * (1 << 21);
+        $carry1 = $s1 >> 21; $s2 += $carry1; $s1 -= $carry1 * (1 << 21);
+        $carry2 = $s2 >> 21; $s3 += $carry2; $s2 -= $carry2 * (1 << 21);
+        $carry3 = $s3 >> 21; $s4 += $carry3; $s3 -= $carry3 * (1 << 21);
+        $carry4 = $s4 >> 21; $s5 += $carry4; $s4 -= $carry4 * (1 << 21);
+        $carry5 = $s5 >> 21; $s6 += $carry5; $s5 -= $carry5 * (1 << 21);
+        $carry6 = $s6 >> 21; $s7 += $carry6; $s6 -= $carry6 * (1 << 21);
+        $carry7 = $s7 >> 21; $s8 += $carry7; $s7 -= $carry7 * (1 << 21);
+        $carry8 = $s8 >> 21; $s9 += $carry8; $s8 -= $carry8 * (1 << 21);
+        $carry9 = $s9 >> 21; $s10 += $carry9; $s9 -= $carry9 * (1 << 21);
+        $carry10 = $s10 >> 21; $s11 += $carry10; $s10 -= $carry10 * (1 << 21);
+
+        return self::intArrayToString(
+            array(
+                $s0 >> 0,
+                $s0 >> 8,
+                ($s0 >> 16) | ($s1 * (1 << 5)),
+                $s1 >> 3,
+                $s1 >> 11,
+                ($s1 >> 19) | ($s2 * (1 << 2)),
+                $s2 >> 6,
+                ($s2 >> 14) | ($s3 * (1 << 7)),
+                $s3 >> 1,
+                $s3 >> 9,
+                ($s3 >> 17) | ($s4 * (1 << 4)),
+                $s4 >> 4,
+                $s4 >> 12,
+                ($s4 >> 20) | ($s5 * (1 << 1)),
+                $s5 >> 7,
+                ($s5 >> 15) | ($s6 * (1 << 6)),
+                $s6 >> 2,
+                $s6 >> 10,
+                ($s6 >> 18) | ($s7 * (1 << 3)),
+                $s7 >> 5,
+                $s7 >> 13,
+                $s8 >> 0,
+                $s8 >> 8,
+                ($s8 >> 16) | ($s9 * (1 << 5)),
+                $s9 >> 3,
+                $s9 >> 11,
+                ($s9 >> 19) | ($s10 * (1 << 2)),
+                $s10 >> 6,
+                ($s10 >> 14) | ($s11 * (1 << 7)),
+                $s11 >> 1,
+                $s11 >> 9,
+                $s11 >> 17
+            )
+        );
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/README.md

@@ +1 @@
+# Curve25519 Data Structures
+
+These are PHP implementation of the [structs used in the ref10 curve25519 code](https://github.com/jedisct1/libsodium/blob/master/src/libsodium/include/sodium/private/curve25519_ref10.h).

wp-includes/sodium_compat/src/Core/X25519.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_X25519
+ */
+abstract class ParagonIE_Sodium_Core_X25519 extends ParagonIE_Sodium_Core_Curve25519
+{
+    /**
+     * Alters the objects passed to this method in place.
+     *
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $g
+     * @param int $b
+     */
+    public static function fe_cswap(
+        ParagonIE_Sodium_Core_Curve25519_Fe $f,
+        ParagonIE_Sodium_Core_Curve25519_Fe $g,
+        $b = 0
+    ) {
+        $f0 = (int) $f[0];
+        $f1 = (int) $f[1];
+        $f2 = (int) $f[2];
+        $f3 = (int) $f[3];
+        $f4 = (int) $f[4];
+        $f5 = (int) $f[5];
+        $f6 = (int) $f[6];
+        $f7 = (int) $f[7];
+        $f8 = (int) $f[8];
+        $f9 = (int) $f[9];
+        $g0 = (int) $g[0];
+        $g1 = (int) $g[1];
+        $g2 = (int) $g[2];
+        $g3 = (int) $g[3];
+        $g4 = (int) $g[4];
+        $g5 = (int) $g[5];
+        $g6 = (int) $g[6];
+        $g7 = (int) $g[7];
+        $g8 = (int) $g[8];
+        $g9 = (int) $g[9];
+        $b = -$b;
+        $x0 = ($f0 ^ $g0) & $b;
+        $x1 = ($f1 ^ $g1) & $b;
+        $x2 = ($f2 ^ $g2) & $b;
+        $x3 = ($f3 ^ $g3) & $b;
+        $x4 = ($f4 ^ $g4) & $b;
+        $x5 = ($f5 ^ $g5) & $b;
+        $x6 = ($f6 ^ $g6) & $b;
+        $x7 = ($f7 ^ $g7) & $b;
+        $x8 = ($f8 ^ $g8) & $b;
+        $x9 = ($f9 ^ $g9) & $b;
+        $f[0] = $f0 ^ $x0;
+        $f[1] = $f1 ^ $x1;
+        $f[2] = $f2 ^ $x2;
+        $f[3] = $f3 ^ $x3;
+        $f[4] = $f4 ^ $x4;
+        $f[5] = $f5 ^ $x5;
+        $f[6] = $f6 ^ $x6;
+        $f[7] = $f7 ^ $x7;
+        $f[8] = $f8 ^ $x8;
+        $f[9] = $f9 ^ $x9;
+        $g[0] = $g0 ^ $x0;
+        $g[1] = $g1 ^ $x1;
+        $g[2] = $g2 ^ $x2;
+        $g[3] = $g3 ^ $x3;
+        $g[4] = $g4 ^ $x4;
+        $g[5] = $g5 ^ $x5;
+        $g[6] = $g6 ^ $x6;
+        $g[7] = $g7 ^ $x7;
+        $g[8] = $g8 ^ $x8;
+        $g[9] = $g9 ^ $x9;
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $f
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function fe_mul121666(ParagonIE_Sodium_Core_Curve25519_Fe $f)
+    {
+        $h = array(
+            $f[0] * 121666,
+            $f[1] * 121666,
+            $f[2] * 121666,
+            $f[3] * 121666,
+            $f[4] * 121666,
+            $f[5] * 121666,
+            $f[6] * 121666,
+            $f[7] * 121666,
+            $f[8] * 121666,
+            $f[9] * 121666
+        );
+
+        $carry9 = ($h[9] + (1 << 24)) >> 25; $h[0] += $carry9 * 19; $h[9] -= $carry9 << 25;
+        $carry1 = ($h[1] + (1 << 24)) >> 25; $h[2] += $carry1; $h[1] -= $carry1 << 25;
+        $carry3 = ($h[3] + (1 << 24)) >> 25; $h[4] += $carry3; $h[3] -= $carry3 << 25;
+        $carry5 = ($h[5] + (1 << 24)) >> 25; $h[6] += $carry5; $h[5] -= $carry5 << 25;
+        $carry7 = ($h[7] + (1 << 24)) >> 25; $h[8] += $carry7; $h[7] -= $carry7 << 25;
+
+        $carry0 = ($h[0] + (1 << 25)) >> 26; $h[1] += $carry0; $h[0] -= $carry0 << 26;
+        $carry2 = ($h[2] + (1 << 25)) >> 26; $h[3] += $carry2; $h[2] -= $carry2 << 26;
+        $carry4 = ($h[4] + (1 << 25)) >> 26; $h[5] += $carry4; $h[4] -= $carry4 << 26;
+        $carry6 = ($h[6] + (1 << 25)) >> 26; $h[7] += $carry6; $h[6] -= $carry6 << 26;
+        $carry8 = ($h[8] + (1 << 25)) >> 26; $h[9] += $carry8; $h[8] -= $carry8 << 26;
+
+        foreach ($h as $i => $value) {
+            $h[$i] = (int) $value;
+        }
+        return ParagonIE_Sodium_Core_Curve25519_Fe::fromArray($h);
+    }
+
+    /**
+     * @param string $n
+     * @param string $p
+     * @return string
+     */
+    public static function crypto_scalarmult_curve25519_ref10($n, $p)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+        # fe_frombytes(x1,p);
+        $x1 = self::fe_frombytes($p);
+        # fe_1(x2);
+        $x2 = self::fe_1();
+        # fe_0(z2);
+        $z2 = self::fe_0();
+        # fe_copy(x3,x1);
+        $x3 = self::fe_copy($x1);
+        # fe_1(z3);
+        $z3 = self::fe_1();
+
+        # swap = 0;
+        $swap = 0;
+
+        # for (pos = 254;pos >= 0;--pos) {
+        for ($pos = 254; $pos >= 0; --$pos) {
+            # b = e[pos / 8] >> (pos & 7);
+            $b = self::chrToInt(
+                    $e[(int) floor($pos / 8)]
+                ) >> ($pos & 7);
+            # b &= 1;
+            $b &= 1;
+            # swap ^= b;
+            $swap ^= $b;
+            # fe_cswap(x2,x3,swap);
+            self::fe_cswap($x2, $x3, $swap);
+            # fe_cswap(z2,z3,swap);
+            self::fe_cswap($z2, $z3, $swap);
+            # swap = b;
+            $swap = $b;
+            # fe_sub(tmp0,x3,z3);
+            $tmp0 = self::fe_sub($x3, $z3);
+            # fe_sub(tmp1,x2,z2);
+            $tmp1 = self::fe_sub($x2, $z2);
+
+            # fe_add(x2,x2,z2);
+            $x2 = self::fe_add($x2, $z2);
+
+            # fe_add(z2,x3,z3);
+            $z2 = self::fe_add($x3, $z3);
+
+            # fe_mul(z3,tmp0,x2);
+            $z3 = self::fe_mul($tmp0, $x2);
+
+            # fe_mul(z2,z2,tmp1);
+            $z2 = self::fe_mul($z2, $tmp1);
+
+            # fe_sq(tmp0,tmp1);
+            $tmp0 = self::fe_sq($tmp1);
+
+            # fe_sq(tmp1,x2);
+            $tmp1 = self::fe_sq($x2);
+
+            # fe_add(x3,z3,z2);
+            $x3 = self::fe_add($z3, $z2);
+
+            # fe_sub(z2,z3,z2);
+            $z2 = self::fe_sub($z3, $z2);
+
+            # fe_mul(x2,tmp1,tmp0);
+            $x2 = self::fe_mul($tmp1, $tmp0);
+
+            # fe_sub(tmp1,tmp1,tmp0);
+            $tmp1 = self::fe_sub($tmp1, $tmp0);
+
+            # fe_sq(z2,z2);
+            $z2 = self::fe_sq($z2);
+
+            # fe_mul121666(z3,tmp1);
+            $z3 = self::fe_mul121666($tmp1);
+
+            # fe_sq(x3,x3);
+            $x3 = self::fe_sq($x3);
+
+            # fe_add(tmp0,tmp0,z3);
+            $tmp0 = self::fe_add($tmp0, $z3);
+
+            # fe_mul(z3,x1,z2);
+            $z3 = self::fe_mul($x1, $z2);
+
+            # fe_mul(z2,tmp1,tmp0);
+            $z2 = self::fe_mul($tmp1, $tmp0);
+        }
+
+        # fe_cswap(x2,x3,swap);
+        self::fe_cswap($x2, $x3, $swap);
+
+        # fe_cswap(z2,z3,swap);
+        self::fe_cswap($z2, $z3, $swap);
+
+        # fe_invert(z2,z2);
+        $z2 = self::fe_invert($z2);
+
+        # fe_mul(x2,x2,z2);
+        $x2 = self::fe_mul($x2, $z2);
+        # fe_tobytes(q,x2);
+        return self::fe_tobytes($x2);
+    }
+
+    /**
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY
+     * @param ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
+     * @return ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public static function edwards_to_montgomery(
+        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsY,
+        ParagonIE_Sodium_Core_Curve25519_Fe $edwardsZ
+    ) {
+        $tempX = self::fe_add($edwardsZ, $edwardsY);
+        $tempZ = self::fe_sub($edwardsZ, $edwardsY);
+        $tempZ = self::fe_invert($tempZ);
+        return self::fe_mul($tempX, $tempZ);
+    }
+
+    /**
+     * @param string $n
+     * @return string
+     */
+    public static function crypto_scalarmult_curve25519_ref10_base($n)
+    {
+        # for (i = 0;i < 32;++i) e[i] = n[i];
+        $e = '' . $n;
+        # e[0] &= 248;
+        $e[0] = self::intToChr(
+            self::chrToInt($e[0]) & 248
+        );
+        # e[31] &= 127;
+        # e[31] |= 64;
+        $e[31] = self::intToChr(
+            (self::chrToInt($e[31]) & 127) | 64
+        );
+
+        $A = self::ge_scalarmult_base($e);
+        $pk = self::edwards_to_montgomery($A->Y, $A->Z);
+        return self::fe_tobytes($pk);
+    }
+}

wp-includes/sodium_compat/phpunit.xml.dist

@@ +1 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<phpunit
+    backupGlobals="true"
+    backupStaticAttributes="false"
+    bootstrap="vendor/autoload.php"
+    colors="true"
+    convertErrorsToExceptions="true"
+    convertNoticesToExceptions="true"
+    convertWarningsToExceptions="true"
+    processIsolation="false"
+    stopOnError="false"
+    stopOnFailure="false"
+    syntaxCheck="true"
+>
+    <testsuites>
+        <testsuite name="Unit Tests">
+            <directory suffix="Test.php">./tests/unit</directory>
+        </testsuite>
+    </testsuites>
+    <testsuites>
+        <testsuite name="Libsodium Compatibility Tests">
+            <directory suffix="Test.php">./tests/compat</directory>
+        </testsuite>
+    </testsuites>
+    <filter>
+        <whitelist processUncoveredFilesFromWhitelist="true">
+            <directory suffix=".php">./src</directory>
+        </whitelist>
+    </filter>
+</phpunit>
+ No newline at end of file

wp-includes/sodium_compat/tests/unit/CryptoTest.php

@@ +1 @@
+<?php
+
+class CryptoTest extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_box()
+     * @covers ParagonIE_Sodium_Compat::crypto_box_open()
+     */
+    public function testCryptoBox()
+    {
+        $nonce = str_repeat("\x00", 24);
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+        $message .= str_repeat("\x20", 64);
+
+        $alice_secret = ParagonIE_Sodium_Core_Util::hex2bin('69f208412d8dd5db9d0c6d18512e86f0ec75665ab841372d57b042b27ef89d8c');
+        $alice_public = ParagonIE_Sodium_Core_Util::hex2bin('ac3a70ba35df3c3fae427a7c72021d68f2c1e044040b75f17313c0c8b5d4241d');
+        $bob_secret = ParagonIE_Sodium_Core_Util::hex2bin('b581fb5ae182a16f603f39270d4e3b95bc008310b727a11dd4e784a0044d461b');
+        $bob_public = ParagonIE_Sodium_Core_Util::hex2bin('e8980c86e032f1eb2975052e8d65bddd15c3b59641174ec9678a53789d92c754');
+
+        $alice_to_bob = ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey(
+            $alice_secret,
+            $bob_public
+        );
+        $bob_to_alice = ParagonIE_Sodium_Crypto::box_keypair_from_secretkey_and_publickey(
+            $bob_secret,
+            $alice_public
+        );
+
+        $this->assertSame(
+            bin2hex(ParagonIE_Sodium_Crypto::box($message, $nonce, $bob_to_alice)),
+            bin2hex(ParagonIE_Sodium_Crypto::box($message, $nonce, $alice_to_bob)),
+            'box'
+        );
+    }
+
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_box_seal()
+     * @covers ParagonIE_Sodium_Compat::crypto_box_seal_open()
+     */
+    public function testBoxSeal()
+    {
+        $message = "Lorem ipsum dolor sit amet, consectetur adipiscing elit.";
+
+        $alice_box_kp = ParagonIE_Sodium_Core_Util::hex2bin(
+            '15b36cb00213373fb3fb03958fb0cc0012ecaca112fd249d3cf0961e311caac9' .
+            'fb4cb34f74a928b79123333c1e63d991060244cda98affee14c3398c6d315574'
+        );
+        $alice_box_publickey = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fb4cb34f74a928b79123333c1e63d991060244cda98affee14c3398c6d315574'
+        );
+
+        $sealed_to_alice = ParagonIE_Sodium_Compat::crypto_box_seal($message, $alice_box_publickey);
+
+        $alice_opened = ParagonIE_Sodium_Compat::crypto_box_seal_open($sealed_to_alice, $alice_box_kp);
+        $this->assertSame(
+            $message,
+            $alice_opened,
+            'Decryption failed'
+        );
+    }
+
+    /**
+     *
+     */
+    public function testKeypairs()
+    {
+        $box_keypair = ParagonIE_Sodium_Compat::crypto_box_keypair();
+        $box_public = ParagonIE_Sodium_Compat::crypto_box_publickey($box_keypair);
+
+        $sealed = ParagonIE_Sodium_Compat::crypto_box_seal('Test message', $box_public);
+        $opened = ParagonIE_Sodium_Compat::crypto_box_seal_open($sealed, $box_keypair);
+        $this->assertSame(
+            'Test message',
+            $opened
+        );
+        #
+
+        $sign_keypair = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fcdf31aae72e280cc760186d83e41be216fe1f2c7407dd393ad3a45a2fa501a4' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc'
+        );
+        $sign_secret = ParagonIE_Sodium_Compat::crypto_sign_secretkey($sign_keypair);
+        $sign_public = ParagonIE_Sodium_Compat::crypto_sign_publickey($sign_keypair);
+        $this->assertSame(
+            ParagonIE_Sodium_Core_Util::substr($sign_secret, 32),
+            $sign_public
+        );
+
+        $sign_keypair = ParagonIE_Sodium_Compat::crypto_sign_keypair();
+        $sign_secret = ParagonIE_Sodium_Compat::crypto_sign_secretkey($sign_keypair);
+        $sign_public = ParagonIE_Sodium_Compat::crypto_sign_publickey($sign_keypair);
+        $this->assertSame(
+            ParagonIE_Sodium_Core_Util::substr($sign_secret, 32),
+            $sign_public
+        );
+
+        $sig = ParagonIE_Sodium_Compat::crypto_sign_detached('Test message', $sign_secret);
+        $this->assertTrue(
+            ParagonIE_Sodium_Compat::crypto_sign_verify_detached($sig, 'Test message', $sign_public)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::scalarmult_base()
+     */
+    public function testScalarmultBase()
+    {
+        $alice_secret = ParagonIE_Sodium_Core_Util::hex2bin('69f208412d8dd5db9d0c6d18512e86f0ec75665ab841372d57b042b27ef89d8c');
+        $alice_public = ParagonIE_Sodium_Core_Util::hex2bin('ac3a70ba35df3c3fae427a7c72021d68f2c1e044040b75f17313c0c8b5d4241d');
+
+        $this->assertSame(
+            bin2hex($alice_public),
+            bin2hex(ParagonIE_Sodium_Crypto::scalarmult_base($alice_secret))
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::scalarmult()
+     */
+    public function testScalarmult()
+    {
+        $alice_secret = ParagonIE_Sodium_Core_Util::hex2bin('69f208412d8dd5db9d0c6d18512e86f0ec75665ab841372d57b042b27ef89d8c');
+        $alice_public = ParagonIE_Sodium_Core_Util::hex2bin('ac3a70ba35df3c3fae427a7c72021d68f2c1e044040b75f17313c0c8b5d4241d');
+        $bob_secret = ParagonIE_Sodium_Core_Util::hex2bin('b581fb5ae182a16f603f39270d4e3b95bc008310b727a11dd4e784a0044d461b');
+        $bob_public = ParagonIE_Sodium_Core_Util::hex2bin('e8980c86e032f1eb2975052e8d65bddd15c3b59641174ec9678a53789d92c754');
+
+        $this->assertSame(
+            bin2hex(ParagonIE_Sodium_Crypto::scalarmult($alice_secret, $bob_public)),
+            bin2hex(ParagonIE_Sodium_Crypto::scalarmult($bob_secret, $alice_public))
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::sign_detached()
+     */
+    public function testSignDetached()
+    {
+        $secret = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fcdf31aae72e280cc760186d83e41be216fe1f2c7407dd393ad3a45a2fa501a4' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc'
+        );
+        $message = 'Test message';
+        $this->assertSame(
+            '5e413e791d9bcdbaa1cfd4f83b01c73926f436a467cfc2634fc90651fb0465bfea76083b4ff247f925df96e89da3d9edc11029adf1601cd0f97d1b2c4b02e905',
+            bin2hex(ParagonIE_Sodium_Crypto::sign_detached($message, $secret)),
+            'Generated different signatures'
+        );
+
+        $message = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.';
+        $this->assertSame(
+            '36a6d2748f6ab8f76c122a562d55343cb7c6f15c8a45bd55bd8b9e9fadd2363f370cb78fba42c550d487b9bd7413312b6490c8b3ee2cea638997172a9c8c250f',
+            bin2hex(ParagonIE_Sodium_Crypto::sign_detached($message, $secret)),
+            'Generated different signatures'
+        );
+
+
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::sign()
+     * @covers ParagonIE_Sodium_Crypto::sign_open()
+     */
+    public function testSign()
+    {
+        $secret = ParagonIE_Sodium_Core_Util::hex2bin(
+            'fcdf31aae72e280cc760186d83e41be216fe1f2c7407dd393ad3a45a2fa501a4' .
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc'
+        );
+        $public = ParagonIE_Sodium_Core_Util::hex2bin(
+            'ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc'
+        );
+        $message = random_bytes(random_int(1, 1024));
+        $signed = ParagonIE_Sodium_Compat::crypto_sign($message, $secret);
+        $this->assertSame(
+            bin2hex($message),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_sign_open($signed, $public)),
+            'Signature broken with known good keys'
+        );
+        $sign_keypair = ParagonIE_Sodium_Compat::crypto_sign_keypair();
+        $sign_secret = ParagonIE_Sodium_Compat::crypto_sign_secretkey($sign_keypair);
+        $sign_public = ParagonIE_Sodium_Compat::crypto_sign_publickey($sign_keypair);
+
+        $message = random_bytes(random_int(1, 1024));
+        $signed = ParagonIE_Sodium_Compat::crypto_sign($message, $sign_secret);
+        $this->assertSame(
+            bin2hex($message),
+            bin2hex(ParagonIE_Sodium_Compat::crypto_sign_open($signed, $sign_public)),
+            'Signature broken with random keys'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_secretbox()
+     * @covers ParagonIE_Sodium_Compat::crypto_secretbox_open()
+     */
+    public function testSecretbox()
+    {
+        $secret = random_bytes(32);
+        $nonce = random_bytes(24);
+
+        $message = random_bytes(random_int(1, 1024));
+        $cipher = ParagonIE_Sodium_Compat::crypto_secretbox($message, $nonce, $secret);
+
+        $this->assertSame(
+            $message,
+            ParagonIE_Sodium_Compat::crypto_secretbox_open($cipher, $nonce, $secret)
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Crypto::sign_verify_detached()
+     */
+    public function testVerifyDetached()
+    {
+        $public = ParagonIE_Sodium_Core_Util::hex2bin('ee00f800ae9e986b994ec0af67fe6b017eb78704e81639eee7efa3d3a831d1bc');
+
+        $message = 'Lorem ipsum dolor sit amet, consectetur adipiscing elit.';
+        $sig = ParagonIE_Sodium_Core_Util::hex2bin(
+            '36a6d2748f6ab8f76c122a562d55343cb7c6f15c8a45bd55bd8b9e9fadd2363f' .
+            '370cb78fba42c550d487b9bd7413312b6490c8b3ee2cea638997172a9c8c250f'
+        );
+        $this->assertTrue(
+            ParagonIE_Sodium_Crypto::sign_verify_detached($sig, $message, $public),
+            'Invalid signature verification checking'
+        );
+    }
+}

wp-includes/sodium_compat/tests/unit/Blake2bTest.php

@@ +1 @@
+<?php
+
+class Blake2bTest extends PHPUnit_Framework_TestCase
+{
+    public function setUp()
+    {
+        ParagonIE_Sodium_Compat::$disableFallbackForUnitTests = true;
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_generichash()
+     */
+    public function testGenericHash()
+    {
+        $this->assertSame(
+            pack('H*', 'df654812bac492663825520ba2f6e67cf5ca5bdc13d4e7507a98cc4c2fcc3ad8'),
+            ParagonIE_Sodium_Compat::crypto_generichash('Paragon Initiative Enterprises, LLC'),
+            'Chosen input.'
+        );
+    }
+
+    /**
+     * @covers ParagonIE_Sodium_Compat::crypto_generichash_init()
+     * @covers ParagonIE_Sodium_Compat::crypto_generichash_update()
+     * @covers ParagonIE_Sodium_Compat::crypto_generichash_final()
+     */
+    public function testGenericHashStream()
+    {
+        $ctx = ParagonIE_Sodium_Compat::crypto_generichash_init();
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, 'Paragon Initiative ');
+        ParagonIE_Sodium_Compat::crypto_generichash_update($ctx, 'Enterprises, LLC');
+        $this->assertSame(
+            'df654812bac492663825520ba2f6e67cf5ca5bdc13d4e7507a98cc4c2fcc3ad8',
+            bin2hex(ParagonIE_Sodium_Compat::crypto_generichash_final($ctx)),
+            'Chosen input.'
+        );
+    }
+}

wp-includes/sodium_compat/src/Core/Curve25519/Ge/P3.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Curve25519_Ge_P3
+ */
+class ParagonIE_Sodium_Core_Curve25519_Ge_P3
+{
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $X;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Y;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $Z;
+
+    /**
+     * @var ParagonIE_Sodium_Core_Curve25519_Fe
+     */
+    public $T;
+
+    public function __construct(
+        ParagonIE_Sodium_Core_Curve25519_Fe $x = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $y = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $z = null,
+        ParagonIE_Sodium_Core_Curve25519_Fe $t = null
+    ) {
+        $this->X = $x;
+        $this->Y = $y;
+        $this->Z = $z;
+        $this->T = $t;
+    }
+}

wp-admin/includes/file.php

@@ -487 +487 @@
  *
  * @param string $url the URL of the file to download
  * @param int $timeout The timeout for the request to download the file default 300 seconds
+ * @param string $public_key Ed25519 public key (for crypto_sign_verify_detached())
  * @return mixed WP_Error on failure, string Filename on success.
  */
-function download_url( $url, $timeout = 300 ) {
+function download_url( $url, $timeout = 300, $public_key = null, $public_key_raw = false ) {
         //WARNING: The file is not automatically deleted, The script must unlink() the file.
         if ( ! $url )
                 return new WP_Error('http_no_url', __('Invalid URL Provided.'));
@@ -520 +521 @@
                         return $md5_check;
                 }
         }
+        if ( $public_key ) {
+        $content_ed25519_hex = wp_remote_retrieve_header( $response, 'content-ed25519' );
+        $ed25519_check = verify_file_ed25519( $tmpfname, $public_key, $content_ed25519_hex );
+            if ( is_wp_error( $ed25519_check ) ) {
+                unlink( $tmpfname );
+                return $ed25519_check;
+        }
+    }
 
         return $tmpfname;
 }
 
+/**
+ * Verifies the Ed25519 signature of a file for a given public key.
+ *
+ * @since 4.8.0 (presumably)
+ *
+ * @param string $filename
+ * @param string $public_key
+ * @param string $signature
+ * @return bool|object WP_Error on failure, true on success
+ */
+function verify_file_ed25519( $filename, $public_key, $signature ) {
+    if ( ParagonIE_Sodium_Core_Util::strlen( $public_key ) === ParagonIE_Sodium_Compat::CRYPTO_SIGN_PUBLICKEYBYTES * 2 ) {
+        $public_key = ParagonIE_Sodium_Compat::hex2bin($public_key);
+    }
+    if ( ParagonIE_Sodium_Core_Util::strlen( $signature ) === ParagonIE_Sodium_Compat::CRYPTO_SIGN_BYTES * 2 ) {
+        $signature = ParagonIE_Sodium_Compat::hex2bin($signature);
+    }
+
+    $file_contents = file_get_contents( $filename );
+
+    $verified = ParagonIE_Sodium_Compat::crypto_sign_verify_detached( $signature, $file_contents, $public_key );
+    if ( $verified ) {
+        return true;
+    }
+
+    return new WP_Error( 'ed25519_mismatch', sprintf( __( 'The signature of the file (%1$s) is not valid for the given public key (%2$s).' ), bin2hex( $signature ), bin2hex( $public_key ) ) );
+}
+
 /**
  * Calculates and compares the MD5 of a file to its expected value.
  *

wp-includes/sodium_compat/src/Core/Salsa20.php

@@ +1 @@
+<?php
+
+/**
+ * Class ParagonIE_Sodium_Core_Salsa20
+ */
+abstract class ParagonIE_Sodium_Core_Salsa20 extends ParagonIE_Sodium_Core_Util
+{
+    const ROUNDS = 20;
+
+    /**
+     * Calculate an salsa20 hash of a single block
+     *
+     * @param string $in
+     * @param string $k
+     * @param string|null $c
+     * @return string;
+     */
+    public static function core_salsa20($in, $k, $c = null)
+    {
+        if (self::strlen($k) < 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        if ($c === null) {
+            $j0  = $x0  = 0x61707865;
+            $j5  = $x5  = 0x3320646e;
+            $j10 = $x10 = 0x79622d32;
+            $j15 = $x15 = 0x6b206574;
+        } else {
+            $j0  = $x0  = self::load_4(self::substr($c,  0, 4));
+            $j5  = $x5  = self::load_4(self::substr($c,  4, 4));
+            $j10 = $x10 = self::load_4(self::substr($c,  8, 4));
+            $j15 = $x15 = self::load_4(self::substr($c, 12, 4));
+        }
+        $j1  = $x1  = self::load_4(self::substr($k,  0, 4));
+        $j2  = $x2  = self::load_4(self::substr($k,  4, 4));
+        $j3  = $x3  = self::load_4(self::substr($k,  8, 4));
+        $j4  = $x4  = self::load_4(self::substr($k, 12, 4));
+        $j6  = $x6  = self::load_4(self::substr($in, 0, 4));
+        $j7  = $x7  = self::load_4(self::substr($in, 4, 4));
+        $j8  = $x8  = self::load_4(self::substr($in, 8, 4));
+        $j9  = $x9  = self::load_4(self::substr($in, 12, 4));
+        $j11 = $x11 = self::load_4(self::substr($k, 16, 4));
+        $j12 = $x12 = self::load_4(self::substr($k, 20, 4));
+        $j13 = $x13 = self::load_4(self::substr($k, 24, 4));
+        $j14 = $x14 = self::load_4(self::substr($k, 28, 4));
+
+        for ($i = self::ROUNDS; $i > 0; $i -= 2) {
+            $x4 ^= self::rotate($x0 + $x12, 7);
+            $x8 ^= self::rotate($x4 + $x0, 9);
+            $x12 ^= self::rotate($x8 + $x4, 13);
+            $x0 ^= self::rotate($x12 + $x8, 18);
+
+            $x9 ^= self::rotate($x5 + $x1, 7);
+            $x13 ^= self::rotate($x9 + $x5, 9);
+            $x1 ^= self::rotate($x13 + $x9, 13);
+            $x5 ^= self::rotate($x1 + $x13, 18);
+
+            $x14 ^= self::rotate($x10 + $x6, 7);
+            $x2 ^= self::rotate($x14 + $x10, 9);
+            $x6 ^= self::rotate($x2 + $x14, 13);
+            $x10 ^= self::rotate($x6 + $x2, 18);
+
+            $x3 ^= self::rotate($x15 + $x11, 7);
+            $x7 ^= self::rotate($x3 + $x15, 9);
+            $x11 ^= self::rotate($x7 + $x3, 13);
+            $x15 ^= self::rotate($x11 + $x7, 18);
+
+            $x1 ^= self::rotate($x0 + $x3, 7);
+            $x2 ^= self::rotate($x1 + $x0, 9);
+            $x3 ^= self::rotate($x2 + $x1, 13);
+            $x0 ^= self::rotate($x3 + $x2, 18);
+
+            $x6 ^= self::rotate($x5 + $x4, 7);
+            $x7 ^= self::rotate($x6 + $x5, 9);
+            $x4 ^= self::rotate($x7 + $x6, 13);
+            $x5 ^= self::rotate($x4 + $x7, 18);
+
+            $x11 ^= self::rotate($x10 + $x9, 7);
+            $x8 ^= self::rotate($x11 + $x10, 9);
+            $x9 ^= self::rotate($x8 + $x11, 13);
+            $x10 ^= self::rotate($x9 + $x8, 18);
+
+            $x12 ^= self::rotate($x15 + $x14, 7);
+            $x13 ^= self::rotate($x12 + $x15, 9);
+            $x14 ^= self::rotate($x13 + $x12, 13);
+            $x15 ^= self::rotate($x14 + $x13, 18);
+        }
+
+        $x0  += $j0;
+        $x1  += $j1;
+        $x2  += $j2;
+        $x3  += $j3;
+        $x4  += $j4;
+        $x5  += $j5;
+        $x6  += $j6;
+        $x7  += $j7;
+        $x8  += $j8;
+        $x9  += $j9;
+        $x10 += $j10;
+        $x11 += $j11;
+        $x12 += $j12;
+        $x13 += $j13;
+        $x14 += $j14;
+        $x15 += $j15;
+
+        return self::store32_le($x0) .
+            self::store32_le($x1) .
+            self::store32_le($x2) .
+            self::store32_le($x3) .
+            self::store32_le($x4) .
+            self::store32_le($x5) .
+            self::store32_le($x6) .
+            self::store32_le($x7) .
+            self::store32_le($x8) .
+            self::store32_le($x9) .
+            self::store32_le($x10) .
+            self::store32_le($x11) .
+            self::store32_le($x12) .
+            self::store32_le($x13) .
+            self::store32_le($x14) .
+            self::store32_le($x15);
+    }
+
+    /**
+     * @param int $len
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    public static function salsa20($len, $nonce, $key)
+    {
+        if (self::strlen($key) !== 32) {
+            throw new RangeException('Key must be 32 bytes long');
+        }
+        $kcopy = '' . $key;
+        $in = self::substr($nonce, 0, 8) . str_repeat("\0", 8);
+        $c = '';
+        while ($len >= 64) {
+            $c .= self::core_salsa20($in, $kcopy, null);
+            $u = 1;
+            // Internal counter.
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+            $len -= 64;
+        }
+        if ($len > 0) {
+            $c .= self::substr(
+                self::core_salsa20($in, $kcopy, null),
+                0,
+                $len
+            );
+        }
+        ParagonIE_Sodium_Compat::memzero($kcopy);
+        return $c;
+    }
+
+    /**
+     * @param string $m
+     * @param string $n
+     * @param int $ic
+     * @param string $k
+     * @return string
+     */
+    public static function salsa20_xor_ic($m, $n, $ic, $k)
+    {
+        $mlen = self::strlen($m);
+        if ($mlen < 1) {
+            return '';
+        }
+        $kcopy = self::substr($k, 0, 32);
+        $in = self::substr($n, 0, 8);
+        // Initialize the counter
+        for ($i = 8; $i < 16; ++$i) {
+            $in .= self::intToChr($ic & 0xff);
+            $ic >>= 8;
+        }
+
+        $c = '';
+        while ($mlen >= 64) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, 64),
+                self::substr($block, 0, 64)
+            );
+            $u = 1;
+            for ($i = 8; $i < 16; ++$i) {
+                $u += self::chrToInt($in[$i]);
+                $in[$i] = self::intToChr($u & 0xff);
+                $u >>= 8;
+            }
+
+            $mlen -= 64;
+            $m = self::substr($m, 64);
+        }
+
+        if ($mlen) {
+            $block = self::core_salsa20($in, $kcopy, null);
+            $c .= self::xorStrings(
+                self::substr($m, 0, $mlen),
+                self::substr($block, 0, $mlen)
+            );
+        }
+        ParagonIE_Sodium_Compat::memzero($block);
+        ParagonIE_Sodium_Compat::memzero($kcopy);
+
+        return $c;
+    }
+
+    /**
+     * @param string $message
+     * @param string $nonce
+     * @param string $key
+     * @return string
+     */
+    public static function salsa20_xor($message, $nonce, $key)
+    {
+        return self::xorStrings(
+            $message,
+            self::salsa20(
+                self::strlen($message),
+                $nonce,
+                $key
+            )
+        );
+    }
+
+    /**
+     * @param int $u
+     * @param int $c
+     * @return int
+     */
+    public static function rotate($u, $c)
+    {
+        $u &= 0xffffffff;
+        $c %= 32;
+        return 0xffffffff & (($u << $c) | ($u >> (32 - $c)));
+    }
+}