fialka-core

Cross-platform cryptographic core for the Fialka secure messaging system.

Replaces BouncyCastle on all platforms via a single Rust library compiled to native code:

Platform	Target	Bridge
Android	aarch64-linux-android .so	JNI (FialkaCoreJNI.kt)
Desktop (Windows)	x86_64-pc-windows-msvc .dll	P/Invoke (FialkaCore.cs)
iOS (future)	aarch64-apple-ios .a	C FFI

What's in scope

• crypto/ — Ed25519, X25519, ML-KEM-1024, ML-DSA-44, AES-256-GCM, ChaCha20-Poly1305, HKDF
• identity/ — Seed (24 BIP-39 words) → all key pairs + Tor v3 .onion address
• ratchet/ — Double Ratchet + PQXDH (byte-for-byte compatible with Android/Desktop)
• protocol/ — Wire frame format (0xF1 0xA1 magic header)
• ffi/ — extern "C" interface, header auto-generated by cbindgen

Build

Android

# Install prerequisites
cargo install cargo-ndk
rustup target add aarch64-linux-android armv7-linux-androideabi x86_64-linux-android

# Build .so for all ABIs
./build_android.sh

Windows Desktop

rustup target add x86_64-pc-windows-msvc
build_windows.bat

License

GPL-3.0 — see LICENSE