callmez\wechat\sdk\components\BaseWechat::decryptXml PHP Method

    public function decryptXml($xml, $messageSignature, $timestamp, $nonce)
    {
        $errorCode = $this->getMessageCrypt()->decryptMsg($messageSignature, $timestamp, $nonce, $xml, $xml);
        if ($errorCode) {
            $this->lastError = ['errcode' => $errorCode, 'errmsg' => 'XML数据解密失败!'];
            return false;
        }
        return $xml;
    }