base.py 文件源码

def decrypt(self, text, appid):
        """?????????????

        @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 as e:
            raise DecryptAESError(e)

        try:
            if six.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:]
        except Exception as e:
            raise IllegalBuffer(e)
        if from_appid != appid:
            raise ValidateAppIDError()
        return xml_content