V4.3.0

- Added support for MuSig2
  - Signing and verification
  - Nonce generation
  - Aggregate public key computation
  - Aggregate nonce computation

Author: mrtnetwork

CHANGELOG.md

@@ -1,3 +1,11 @@
+## 4.3.0
+
+- Added support for MuSig2
+  - Signing and verification
+  - Nonce generation
+  - Aggregate public key computation
+  - Aggregate nonce computation
+
 ## 4.2.0
 
 - Added support for aptos addresses using Secp256k1, Secp256r1, Multikey and MultiEd25519.

README.md

@@ -149,6 +149,13 @@ These features make your package a comprehensive solution for encoding, cryptogr
 - XRP (EDDSA, ECDSA)
 - Solana (EDDSA, EDDSA Khalow)
 
+26. **MuSig2 Operation:**
+
+- Signing and verification
+- Nonce generation
+- Aggregate public key computation
+- Aggregate nonce computation
+
 **Example: Explore Our Toolkit**
 
 Discover the capabilities of our comprehensive crypto and blockchain toolkit through interactive tests. Visit our [test page](https://github.com/mrtnetwork/blockchain_utils/tree/main/test) to access thousands of examples, showcasing pure Dart's cross-platform functionality. Learn encoding, cryptography, address management, mnemonics, and more.

lib/bip/address/p2tr_addr.dart

@@ -82,9 +82,8 @@ class P2TRUtils {
   ///
   /// Throws:
   ///   - Exception if the x-coordinate cannot be lifted.
-  static ProjectiveECCPoint liftX(ProjectiveECCPoint pubKeyPoint) {
+  static ProjectiveECCPoint liftX(BigInt x) {
     final BigInt p = Curves.curveSecp256k1.p;
-    final BigInt x = pubKeyPoint.x;
     if (x >= p) {
       throw const AddressConverterException("Unable to compute LiftX point");
     }
@@ -155,28 +154,12 @@ class P2TRUtils {
     final tweek = taggedHash("TapTweak", [...keyX, ...merkleRoot]);
     return tweek;
   }
-  // /// Tweak a public key to create a P2TR address.
-  // ///
-  // /// This method tweaks a public key using a hashTapTweak and lifting the x-coordinate.
-  // ///
-  // /// Parameters:
-  // ///   - pubKey: The public key to be tweaked.
-  // ///
-  // /// Returns:
-  // ///   A `List<int>` representing the tweaked public key for P2TR.
-  // static `List<int>` tweakPublicKey(ProjectiveECCPoint pubPoint) {
-  //   final h = hashTapTweak(pubPoint);
-  //   final n = Curves.generatorSecp256k1 * BigintUtils.fromBytes(h);
-  //   final outPoint = liftX(pubPoint) + n;
-  // return BigintUtils.toBytes(outPoint.x,
-  //     length: Curves.curveSecp256k1.baselen);
-  // }
 
   static ProjectiveECCPoint tweakPublicKey(ProjectiveECCPoint pubPoint,
       {List<dynamic>? script}) {
     final h = calculateTweek(pubPoint, script: script);
     final n = Curves.generatorSecp256k1 * BigintUtils.fromBytes(h);
-    final outPoint = liftX(pubPoint) + n;
+    final outPoint = liftX(pubPoint.x) + n;
 
     return outPoint as ProjectiveECCPoint;
   }

lib/bip/bip/bip32/bip32_path.dart

@@ -104,7 +104,7 @@ class Bip32Path {
       if (!elem.isHardened) {
         pathStr += "${elem.toInt()}/";
       } else {
-        pathStr += "${Bip32KeyIndex.unhardenIndex(elem.toInt())}'/";
+        pathStr += "${Bip32KeyIndex.unhardenIndex(elem.toInt()).toInt()}'/";
       }
     }
     return pathStr.substring(0, pathStr.length - 1);

lib/crypto/crypto/cdsa/cdsa.dart

@@ -24,5 +24,6 @@ export 'point/ec_projective_point.dart';
 /// Export statement for RFC 6979, which provides deterministic ECDSA signatures,
 /// allowing for secure signature generation.
 export 'rfc6979/rfc6979.dart';
-
 export 'crypto_ops/crypto_ops.dart';
+
+export 'musig2/musig2.dart';

lib/crypto/crypto/cdsa/musig2/constants/const.dart

@@ -0,0 +1,25 @@
+import 'package:blockchain_utils/blockchain_utils.dart';
+import 'package:blockchain_utils/crypto/crypto/cdsa/curve/curve.dart';
+
+class MuSig2Const {
+  static const int xOnlyBytesLength = 32;
+  static const int partialSignatureLength = 32;
+  static const int minimumRequiredKey = 2;
+  static const int pubnonceLength = 66;
+  // static const int schnorrSignatureLength = 64;
+  static const int secnoncelength =
+      QuickCrypto.sha256DigestSize * 2 + EcdsaKeysConst.pubKeyCompressedByteLen;
+  static final CurveFp curve = Curves.curveSecp256k1;
+  static final BigInt order = Curves.generatorSecp256k1.order!;
+  static final ProjectiveECCPoint generator = Curves.generatorSecp256k1;
+  static final List<int> zero =
+      List.unmodifiable(List.filled(EcdsaKeysConst.pubKeyCompressedByteLen, 0));
+  static const String deterministicNonceDomain = "MuSig/deterministic/nonce";
+  static const String auxDomain = "MuSig/deterministic/nonce";
+  static const String noncecoefDomain = 'MuSig/noncecoef';
+  static const String challengeDomain = 'BIP0340/challenge';
+  static const String keyAggListDomain = 'KeyAgg list';
+  static const String keyAggCoeffDomain = 'KeyAgg coefficient';
+  static const String nonceDomain = 'MuSig/nonce';
+  static const String musigAuxDomain = "MuSig/aux";
+}

lib/crypto/crypto/cdsa/musig2/exception/exception.dart

@@ -0,0 +1,5 @@
+import 'package:blockchain_utils/exception/exceptions.dart';
+
+class MuSig2Exception extends BlockchainUtilsException {
+  const MuSig2Exception(super.message, {super.details});
+}

lib/crypto/crypto/cdsa/musig2/musig2.dart

@@ -0,0 +1,4 @@
+export 'musig2/musig2.dart';
+export 'exception/exception.dart';
+export 'types/types.dart';
+export 'utils/utils.dart';