feat: replace libsodium with pure Kotlin ChaCha20/Poly1305 implementation
Remove LazySodium/JNA/libsodium native dependencies and replace with
pure Kotlin implementations of ChaCha20, HChaCha20, XChaCha20,
Poly1305 MAC, and XChaCha20-Poly1305 AEAD. This eliminates platform-
specific native binaries while maintaining full NIP-44 compatibility.
- Add ChaCha20Core with RFC 8439 block function, IETF stream XOR,
HChaCha20, and XChaCha20
- Add Poly1305 MAC (RFC 8439 §2.5)
- Add XChaCha20Poly1305 AEAD encrypt/decrypt
- Convert LibSodiumInstance from expect/actual to commonMain object
- Delete platform-specific LibSodiumInstance actuals (android/jvm/ios)
- Remove iOS native interop (cinterop, linker opts, .a libraries)
- Remove lazysodium-java, lazysodium-android, JNA from build deps
- Clean up ProGuard rules (remove JNA/LazySodium keep rules)
- Add RFC 8439 + libsodium test vectors for ChaCha20 and XChaCha20
- Update benchmark to use simplified ChaCha20 API
https://claude.ai/code/session_01YHBwqnb3Z7Q7PX31tJ2G3i
Claude
d586a0dc25