How Binary decode works

[devheitor]

HI I'm working on a scala/akka implementation of this project, and I can get the messages decrypted. But I'm completely stucked on how to decode the decrypted messages. The Python code is too confuse, and I couldn't yet understand the protocol implemented by whatsapp encoding messages to transform them in pure json.

Anyone can help? Any annotations, other documentations, anything? please

[devheitor]

Any idea about how this part of the solution was developed I would appreciate very much. How was possible to find out the tags, the encoding implemented by whatsapp, etc? with which tools? How this part (after decrypting the messages) was "reverse engineered"??

[SLAYER-CODE]

https://i.blackhat.com/USA-19/Wednesday/us-19-Zaikin-Reverse-Engineering-WhatsApp-Encryption-For-Chat-Manipulation-And-More.pdf

https://research.checkpoint.com/2018/fakesapp-a-vulnerability-in-whatsapp/

[OnlineTrackerWhatsApp]

hello, I need a javascript function[also use wapi.js] that Binary decodes easily if it's possible then msg, I give also a donation.