Calculator - encrypted peer-to-peer chat
========================================

This looks like a calculator. It is also a chat.

How to use
----------
1. Run the program. You see a calculator.
2. Type 34+33= to unlock the chat.
3. Enter a room code. The room code is the password:
   anyone who types the same code lands in the same
   encrypted room and can read the messages.
4. Share the program file and the room code only with
   people you want to talk to. Pick a room code that
   is hard to guess.
5. Press Esc to leave the chat. Ctrl+P is a panic
   button: it sends a distress message and jumps back
   to the calculator.

Notes
-----
- No account, no server, no phone number. Peers find
  each other over the local network and the public
  internet via libp2p.
- Messages are end-to-end encrypted (AES-256-GCM,
  key derived from the room code with Argon2).
- Local data is encrypted and self-destructs if it
  looks tampered with.

Linux: the AppImage runs on most distros; the plain
"Calculator-linux" binary needs `chmod +x` first.
Windows: just double-click Calculator.exe.
