function getSignature($str, $key) {

    $signature = "";

    if (function_exists('hash_hmac')) {

        $signature = base64_encode(hash_hmac("sha1", $str, $key, true));

    } else {

        $blocksize = 64;

        $hashfunc = 'sha1';

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

            $key = pack('H*', $hashfunc($key));

        }

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

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

        $opad = str_repeat(chr(0x5c), $blocksize);

        $hmac = pack(

            'H*', $hashfunc(

                ($key ^ $opad) . pack(

                    'H*', $hashfunc(

                        ($key ^ $ipad) . $str

                    )

                )

            )

        );

        $signature = base64_encode($hmac);

    }

    return $signature;

}

public function wjSign($data){

    $key = openssl_pkey_get_private(file_get_contents($this->privateKeyPathWJ));

    openssl_sign($data, $sign, $key, OPENSSL_ALGO_SHA1);

    $sign = base64_encode($sign);

    return $sign;

}

public function wjVerify($data, $sign){

    $sign = base64_decode($sign);

    $key = openssl_pkey_get_public(file_get_contents($this->publicKeyPathWJ));

    $result = openssl_verify($data, $sign, $key, OPENSSL_ALGO_SHA1) === 1;

    return $result;

}