4 ms·

Your only hope for emulating the whole thing would be Corellium, really. Too many real-device-dependencies.

• sprite 6y ago
  This was a few years back but I had token generation working with something much simpler than Corellium using https://github.com/unicorn-engine/unicorn https://github.com/unicorn-engine/unicorn emulator [You will need to set up CommPage, handle system and mach traps, load dyld, etc]. They've probably added more security since then but back when I looked at it some of the data that was encrypted in the token off the top of my head was: - Request Path - Timestamp - Snapchat Binary Size - Bit Flags for various hack checks such as jailbreak, checks for various tweaks, etc. - Device Type - iOS Version - A pair of counters, I believe these were being used to detect real devices being used as signature proxies. - A unique device ID generated at startup I can't remember which one of the tokens this was for. There is a X-Snapchat-Client-Token used at login if I remember correctly and X-Snapchat-Client-Auth-Token which is used for every request. I never ended up using it for anything but it was a lot of fun getting token generation working through emulation. I'm not sure if I was actually able to bypass all their checks or if it would have been detected had I actually tried to deploy it for something in production.