Notes about implementation

Technical problems you might get stuck

• -404 error on invalid padding size

  [!TIP]

  For some reason, instead of making additional error (to explain developers what's wrong and force them to use 12-1024 random padding). Instead, Telegram server (canonical implementation of mtproto) returns -404 to EVERY error that it might get while parsing message.

  How to handle that: write few tests and include additional check that padding size is strictly between 12 and 1024 bytes, including for decrytion functions.