WEGOBizMsgCrypt.py 文件源码

def decrypt(self, text):
        """?????????????
        @param text: ??
        @return: ??????????
        """
        try:
            cryptor = AES.new(self.key, self.mode, self.key[:16])
            # ??BASE64??????????AES-CBC??
            plain_text = cryptor.decrypt(base64.b64decode(text))
        except Exception:
            # print e
            return Crypt_DecryptAES_Error, None
        try:
            if PY2:
                pad = ord(plain_text[-1])
            else:
                pad = plain_text[-1]
            # ???????
            # pkcs7 = PKCS7Encoder()
            # plain_text = pkcs7.encode(plain_text)
            # ??16??????
            content = plain_text[16:-pad]
            xml_len = socket.ntohl(struct.unpack("I", content[: 4])[0])
            xml_content = content[4: xml_len + 4]
            from_appid = content[xml_len + 4:].decode("utf8")
        except Exception:
            return Crypt_IllegalBuffer, None
        if from_appid != self.appid:
            return Crypt_ValidateAppid_Error, None
        return 0, xml_content