Added #

• Pre-built native libraries for all platforms (iOS, Android, macOS, Linux, Windows)
• Signal Protocol: Double Ratchet algorithm for forward secrecy and break-in recovery
• X3DH: Extended Triple Diffie-Hellman for asynchronous key agreement
• Key Management: Curve25519 key pairs (PrivateKey, PublicKey, IdentityKeyPair)
• Pre-keys: PreKeyRecord, SignedPreKeyRecord, PreKeyBundle for session establishment
• Post-quantum: Kyber key pairs (KyberKeyPair, KyberPreKeyRecord) for quantum resistance
• Sessions: SessionRecord, ProtocolAddress for session management
• Messages: SignalMessage, PreKeySignalMessage for encrypted communication
• Sealed Sender: Anonymous message sending (ServerCertificate, SenderCertificate)
• Group Messaging: SenderKey distribution (GroupSession, SenderKeyRecord, SenderKeyDistributionMessage)
• Cryptographic utilities: AES-256-GCM-SIV (Aes256GcmSiv), HKDF (Hkdf), identity fingerprints (Fingerprint)
• Storage interfaces: SessionStore, IdentityKeyStore, PreKeyStore, SignedPreKeyStore, KyberPreKeyStore, SenderKeyStore
• In-memory store implementations for testing and prototyping
• Automatic native library download via build hooks
• SHA256 verification for native library integrity
• LibSignal.init() for optional library pre-initialization
• Comprehensive exception handling with SignalException
• GitHub Actions CI/CD pipeline for automated testing and publishing
• Automated upstream version tracking with AI-powered changelog generation
• Cross-platform build scripts for native library compilation
• Example Flutter application and CLI example demonstrating all features

Security #

• Based on libsignal v0.86.9 from Signal Foundation
• Secret keys are handled securely with proper memory management
• Cryptographic operations use constant-time implementations where applicable