Encrypted peer-to-peer notes & chat. No servers. No accounts. No internet.

VaultLink connects two Android devices directly over Wi-Fi Direct and lets you:

• Share encrypted notes that sync between devices
• Chat in real time with end-to-end encryption
• Pair securely via QR code with fingerprint verification

All cryptography happens on-device. No server ever sees your data.

Session keys are ephemeral — generated fresh each connection, never written to disk.

lib/
├── core/
│   ├── crypto/       # DH handshake, E2EE, session manager
│   ├── p2p/          # Wi-Fi Direct service, message framing
│   ├── chat/         # Chat message model & repository
│   ├── notes/        # Encrypted notes
│   └── pairing/      # QR pairing, contact store
├── features/
│   ├── auth/         # PIN screen, biometric lock
│   ├── chat/         # Chat UI (bubbles, input bar)
│   ├── notes/        # Notes list & editor
│   ├── p2p/          # P2P connection screen
│   └── pairing/      # QR scan & confirm screens
rustlib/              # Rust crypto (Ed25519, X25519, Argon2id via flutter_rust_bridge)
test/                 # Unit + widget tests (target: ≥80% coverage)

• Flutter 3.29.0+
• Rust toolchain (rustup target add aarch64-linux-android)
• Android SDK 21+

# Install dependencies
flutter pub get

# Run tests
flutter test --coverage

# Run on device
flutter run

# Release build (requires signed keystore — see CI secrets)
flutter build appbundle --release

Release signing uses secrets: KEYSTORE_BASE64, KEYSTORE_PASSWORD, KEY_PASSWORD, KEY_ALIAS.

PRs welcome. Please run dart format . and flutter analyze before submitting.

MIT — see LICENSE.