WXBizMsgCrypt.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:
            return WXBizMsgCrypt_DecryptAES_Error, None
        try:
            pad = plain_text[-1]
            # ???????
            # pkcs7 = PKCS7Encoder()
            # plain_text = pkcs7.encode(plain_text)
            # ??16??????
            content = plain_text[16:-pad]
            xml_len = socket.ntohl(struct.unpack(b"I", content[:4])[0])
            xml_content = content[4:xml_len+4]
            from_appid = smart_bytes(content[xml_len+4:])
        except Exception:
            return WXBizMsgCrypt_IllegalBuffer, None
        if from_appid != smart_bytes(appid):
            return WXBizMsgCrypt_ValidateAppid_Error, None
        return 0, xml_content