feat: replace fr.acinq.secp256k1 with pure-Kotlin secp256k1 implementation

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
2026-04-05 04:47:19 +00:00
parent e1304ddcab
commit 4c3b31fe8e
9 changed files with 1734 additions and 185 deletions
@@ -1,59 +0,0 @@
-/*
- * Copyright (c) 2025 Vitor Pamplona
- *
- * Permission is hereby granted, free of charge, to any person obtaining a copy of
- * this software and associated documentation files (the "Software"), to deal in
- * the Software without restriction, including without limitation the rights to use,
- * copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the
- * Software, and to permit persons to whom the Software is furnished to do so,
- * subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in all
- * copies or substantial portions of the Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
- * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
- * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
- * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
- * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
- */
-package com.vitorpamplona.quartz.utils
-
-import fr.acinq.secp256k1.Secp256k1
-
-actual object Secp256k1Instance {
-    private val h02 = Hex.decode("02")
-    private val secp256k1 = Secp256k1.get()
-
-    actual fun compressedPubKeyFor(privKey: ByteArray) = secp256k1.pubKeyCompress(secp256k1.pubkeyCreate(privKey))
-
-    actual fun isPrivateKeyValid(il: ByteArray): Boolean = secp256k1.secKeyVerify(il)
-
-    actual fun signSchnorr(
-        data: ByteArray,
-        privKey: ByteArray,
-        nonce: ByteArray?,
-    ): ByteArray = secp256k1.signSchnorr(data, privKey, nonce)
-
-    actual fun signSchnorr(
-        data: ByteArray,
-        privKey: ByteArray,
-    ): ByteArray = secp256k1.signSchnorr(data, privKey, null)
-
-    actual fun verifySchnorr(
-        signature: ByteArray,
-        hash: ByteArray,
-        pubKey: ByteArray,
-    ): Boolean = secp256k1.verifySchnorr(signature, hash, pubKey)
-
-    actual fun privateKeyAdd(
-        first: ByteArray,
-        second: ByteArray,
-    ): ByteArray = secp256k1.privKeyTweakAdd(first, second)
-
-    actual fun pubKeyTweakMulCompact(
-        pubKey: ByteArray,
-        privateKey: ByteArray,
-    ): ByteArray = secp256k1.pubKeyTweakMul(h02 + pubKey, privateKey).copyOfRange(1, 33)
-}