in signature/php/src/SignatureUtil.php [77:84]
public static function HmacSM3Sign($stringToSign, $secret)
{
if (!isset($stringToSign) || !isset($secret)) {
throw new \InvalidArgumentException('not a valid value for parameter');
}
$ret = self::hmac_sm3($stringToSign, $secret, true);;
return Utils::toBytes($ret);
}