- Convert tuimail repo to Cargo workspace with tuimail and proton-bridge members
- Add proton-bridge binary crate with config, SRP 6a, and auth modules
- Implement ProtonMail SRP 6a exactly matching go-srp:
- Little-endian bigints throughout
- expandHash = SHA512(data||0..3) producing 256 bytes
- k, u, M1, M2 all via expandHash with 256-byte normalised inputs
- Password hashing v3/v4: bcrypt($2y$, salt+proton) + expandHash(output||N)
- Authenticate against Proton API (auth/info → auth/v4), verify server proof
- Persist session (UID, access/refresh tokens) to session.json
- Add bridge.toml and session.json to .gitignore (contain credentials/tokens)
- Add PROTON.md with full build plan for the mini-bridge
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
