Changeset 18111

Timestamp:

06/02/2011 02:21:09 PM (13 years ago)

Author:

ryan

Message:

Resurrect hash_hmac() compat for hosts that --disable-hash. Props aaroncampbell. fixes #17647

File:

• trunk/wp-includes/compat.php (modified) (1 diff)

trunk/wp-includes/compat.php

@@ -32 +32 @@
     return implode( '', $chars );
 }
+
+if ( !function_exists('hash_hmac') ):
+function hash_hmac($algo, $data, $key, $raw_output = false) {
+    return _hash_hmac($algo, $data, $key, $raw_output);
+}
+endif;
+
+function _hash_hmac($algo, $data, $key, $raw_output = false) {
+    $packs = array('md5' => 'H32', 'sha1' => 'H40');
+
+    if ( !isset($packs[$algo]) )
+        return false;
+
+    $pack = $packs[$algo];
+
+    if (strlen($key) > 64)
+        $key = pack($pack, $algo($key));
+
+    $key = str_pad($key, 64, chr(0));
+
+    $ipad = (substr($key, 0, 64) ^ str_repeat(chr(0x36), 64));
+    $opad = (substr($key, 0, 64) ^ str_repeat(chr(0x5C), 64));
+
+    $hmac = $algo($opad . pack($pack, $algo($ipad . $data)));
+
+    if ( $raw_output )
+        return pack( $pack, $hmac );
+    return $hmac;
+}