public static function hmac($algo, $data, $key, $raw_output = false)

    {

        if (function_exists('hash_hmac') && !defined('SIMPLE_TEST')) {

            return hash_hmac($algo, $data, $key, $raw_output);

        }

        $algo = strtolower($algo);

        $pack = 'H' . strlen($algo('test'));

        $size = 64;

        $opad = str_repeat(chr(0x5C), $size);

        $ipad = str_repeat(chr(0x36), $size);

        if (strlen($key) > $size) {

            $key = str_pad(pack($pack, $algo($key)), $size, chr(0x00));

        } else {

            $key = str_pad($key, $size, chr(0x00));

        }

        for ($i = 0; $i < strlen($key) - 1; $i++) {

            $opad[$i] = $opad[$i] ^ $key[$i];

            $ipad[$i] = $ipad[$i] ^ $key[$i];

        }

        $output = $algo($opad . pack($pack, $algo($ipad . $data)));

        return ($raw_output) ? pack($pack, $output) : $output;

    }


    public function encrypt($input, $config)

    {

        return base64_encode(openssl_encrypt($input, 'AES-128-CBC', $config['data_secret'], OPENSSL_RAW_DATA, $config['data_secret_iv']));

    }


    // 解密

    public function decrypt($input, $config)

    {

        return openssl_decrypt(base64_decode($input), 'AES-128-CBC', $config['data_secret'], OPENSSL_RAW_DATA, $config['data_secret_iv']);

    }