Prepare coinlib_flutter for testing MuSig2

Author: MatthewLM

coinlib_flutter/example/lib/main.dart

@@ -41,9 +41,49 @@ class MyApp extends StatelessWidget {
         prefix: coinlib.Network.mainnet.messagePrefix,
       );
 
-      final schnorrSignature = coinlib.SchnorrSignature.sign(
-        privKey, Uint8List(32),
+      // MuSig with adaptor signature example
+
+      int otherI(int i) => i == 0 ? 1 : 0;
+
+      final muSigPrivKeys = List.generate(
+        2,
+        (i) => coinlib.ECPrivateKey(Uint8List(32)..last = i+1),
+      );
+      final muSigPrivs = List.generate(
+        2,
+        (i) => coinlib.MuSigPrivate(
+          muSigPrivKeys[i],
+          { muSigPrivKeys[otherI(i)].pubkey },
+        ),
+      );
+      final muSigSessions = List.generate(
+        2,
+        (i) => coinlib.MuSigStatefulSigningSession(
+          keys: muSigPrivs[i].public,
+          ourPublicKey: muSigPrivKeys[i].pubkey,
+        ),
+      );
+      final partialSigs = List.generate(
+        2,
+        (i) => muSigSessions[i].sign(
+          otherNonces: {
+            muSigPrivKeys[otherI(i)].pubkey:
+              muSigSessions[otherI(i)].ourPublicNonce,
+          },
+          hash: Uint8List(32),
+          privKey: muSigPrivKeys[i],
+          adaptor: privKey.pubkey,
+        ),
+      );
+
+      muSigSessions.first.addPartialSignature(
+        partialSig: partialSigs.last,
+        participantKey: muSigPrivKeys.last.pubkey,
       );
+      final adaptorSig = (
+       muSigSessions.first.finish() as coinlib.MuSigResultAdaptor
+      ).adaptorSignature;
+      final finalSig = adaptorSig.adapt(privKey);
 
       return Column(
         spacing: 10,
@@ -56,8 +96,8 @@ class MyApp extends StatelessWidget {
             " $msgSignature."
           ),
           Text(
-            "An example Schnorr signature is"
-            " ${coinlib.bytesToHex(schnorrSignature.data)}."
+            "An example MuSig2 Schnorr signature is"
+            " ${coinlib.bytesToHex(finalSig.data)}."
           ),
         ],
       );

coinlib_flutter/example/pubspec.lock

@@ -36,18 +36,17 @@ packages:
   coinlib:
     dependency: transitive
     description:
-      name: coinlib
-      sha256: cf8bf904f49339fd5ccd8c51dbdb099c5a616072507076bab724239d2e34b97e
-      url: "https://pub.dev"
-    source: hosted
-    version: "4.0.0"
+      path: "../../coinlib"
+      relative: true
+    source: path
+    version: "4.1.0"
   coinlib_flutter:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "4.0.0"
+    version: "5.0.0"
   collection:
     dependency: transitive
     description:
@@ -295,14 +294,6 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "14.3.1"
-  wasm_interop:
-    dependency: transitive
-    description:
-      name: wasm_interop
-      sha256: b1b378f07a4cf0103c25faf34d9a64d2c3312135b9efb47e0ec116ec3b14e48f
-      url: "https://pub.dev"
-    source: hosted
-    version: "2.0.1"
 sdks:
   dart: ">=3.8.0-0 <4.0.0"
   flutter: ">=3.18.0-18.0.pre.54"

coinlib_flutter/pubspec.yaml

@@ -2,15 +2,16 @@ name: coinlib_flutter
 description:
   A flutter wrapper for coinlib, a straight-forward, modular library for
   Peercoin and other Satoshi-based UTXO blockchains
-version: 4.0.0
+version: 5.0.0
 repository: https://github.com/peercoin/coinlib
 
 environment:
   sdk: '>=3.2.0 <4.0.0'
   flutter: ">=2.17.0"
 
 dependencies:
-  coinlib: ^4.0.0
+  coinlib:
+    path: ../coinlib
   flutter:
     sdk: flutter
   plugin_platform_interface: ^2.0.2