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

git-svn-id: https://develop.svn.wordpress.org/trunk@18111 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Ryan Boren 2011-06-02 14:21:09 +00:00
parent 36f1805ec4
commit ee0e7b23db
1 changed files with 29 additions and 0 deletions
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29
wp-includes/compat.php
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@ -31,3 +31,32 @@ function _mb_substr( $str, $start, $length=null, $encoding=null ) {
$chars = is_null( $length )? array_slice( $match[0], $start ) : array_slice( $match[0], $start, $length );
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;
}