Implements all secp256k1 operations used by Secp256k1Instance in pure Kotlin,
eliminating the dependency on native secp256k1 bindings (fr.acinq.secp256k1-kmp).
Implementation:
- Field.kt: 256-bit unsigned integer arithmetic, field mod p, scalar mod n
- Point.kt: EC point operations (Jacobian coords), point parsing/serialization
- Secp256k1.kt: Public API - pubkeyCreate, pubKeyCompress, secKeyVerify,
signSchnorr/verifySchnorr (BIP-340), privKeyTweakAdd, pubKeyTweakMul
Tests (36 total):
- All 19 BIP-340 test vectors (signing vectors 0-3, 15-18; verify vectors 4-14)
- ACINQ test vectors for key creation, compression, secKeyVerify, privKeyTweakAdd,
pubKeyTweakMul
- ECDH symmetry and sign/verify round-trip tests
Secp256k1Instance is now a concrete object in commonMain instead of expect/actual,
delegating to the pure-Kotlin implementation. All existing NIP-44 and BIP-32 tests
pass with the new implementation.
https://claude.ai/code/session_01BhU63WUe9AhikZxRdw3Lpg
Claude
4c3b31fe8e