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<?php
//(hash) - enabled by default as of PHP 5.1.2
function hash_hmac($algo, $data, $key, $raw_output=false)
{
/* md5 and sha1 only */
$algo=strtolower($algo);
$p=array('md5'=>'H32','sha1'=>'H40');
if ( !isset($p[$algo]) or !function_exists($algo) )
{
$algo = 'md5';
}
if(strlen($key)>64) $key=pack($p[$algo],$algo($key));
if(strlen($key)<64) $key=str_pad($key,64,chr(0));
$ipad=substr($key,0,64) ^ str_repeat(chr(0x36),64);
$opad=substr($key,0,64) ^ str_repeat(chr(0x5C),64);
$ret = $algo($opad.pack($p[$algo],$algo($ipad.$data)));
if ($raw_output)
{
$ret = pack('H*', $ret);
}
return $ret;
}
?>
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