Cw 565 sign messages (#1378)

* version bump to 3.13.9, auth working on mac

* bump flutter version in workflow file

* workflow fix

* test fix

* downgrade flutter version

* test fix

* test fix

* update gradle version

* start working on ui for message signing

* updates

* sign working for a few wallet types

* updates & verification for electrum currencies

* nano support

* sign/verify working on eth, bitcoin broken

* update translations

* Implement Verify Message for Monero

* save [skip ci]

* pub key extraction working

* fixes for electrum signing

* verify working for solana!

* electrum still not working :( [skip ci]

* electrum messages working!

* fixes for updated dart version, localization file updates

* remove accidental inclusion

* missed some unimplemented throws

* Update res/values/strings_de.arb

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

* Apply suggestions from code review

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

* review suggestions and updates [skip ci]

* [skip ci] add polygon

* [skip ci] merge mac-auth/update version

* fix litecoin

* bio auth mac fix

* remove comment and change duration from 2 to 0

* cherry pick previous changes

* litecoin fixes, sign form fixes, use new walletAddressPicker

* support accounts

* verify messages working for monero

* working sign and verify messages for nano

* electrum signing working [skip ci]

* additional nano fixes

* update translations

* attempt to decode signatures with base64

* workaround for secure storage bug on mac

* bump version to 3.19.5 (because breez will need this version anyways)

* some code cleanup

* some changess didn't get saved

* just documenting the issue [skip ci]

* undo accidental removal + minor code cleanup

* merge conflicts

* merge fixes [skip ci]

* add tron support

* [wip] fixing

* remove duplicate references to electrum path for maintainability

* fixes

* minor fix

* fixes

* undo debug comment

* update migration for all electrum based wallets

* hotfixes

* copy over the rest of the fixes

* minor code cleanup [skip ci]

* updates

* electrum signing workinggit statusgit statusgit statusgit status!

* copy same fixes for litecoin

* litecoin fixes

* add v to litecoin signatures

* fix dependencies

* fix bitcoin_base version

* merge fix

* dep override

* fix conflicts with main

* trial fix for android build

* fixes

* fix

* dep fix, should build

* fix signing for bitcoin cash

* [skip ci] minor code cleanup

* [skip ci] minor code cleanup 2

* forgot wonero, various other fixes

* more fixes

* fix solana (untested)

---------

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>
Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

cw_solana/lib/solana_wallet.dart

@@ -32,6 +32,8 @@ import 'package:shared_preferences/shared_preferences.dart';
 import 'package:solana/base58.dart';
 import 'package:solana/metaplex.dart' as metaplex;
 import 'package:solana/solana.dart';
+import 'package:solana/src/crypto/ed25519_hd_keypair.dart';
+import 'package:cryptography/cryptography.dart';
 
 part 'solana_wallet.g.dart';
 
@@ -571,17 +573,59 @@ abstract class SolanaWalletBase
     });
   }
 
-  Future<String> signSolanaMessage(String message) async {
+  @override
+  Future<String> signMessage(String message, {String? address}) async {
     // Convert the message to bytes
     final messageBytes = utf8.encode(message);
 
     // Sign the message bytes with the wallet's private key
-    final signature = await _walletKeyPair!.sign(messageBytes);
+    final signature = (await _walletKeyPair!.sign(messageBytes)).toString();
 
-    // Convert the signature to a hexadecimal string
-    final hex = HEX.encode(signature.bytes);
+    return HEX.encode(utf8.encode(signature)).toUpperCase();
+  }
 
-    return hex;
+  List<List<int>> bytesFromSigString(String signatureString) {
+    final regex = RegExp(r'Signature\(\[(.+)\], publicKey: (.+)\)');
+    final match = regex.firstMatch(signatureString);
+
+    if (match != null) {
+      final bytesString = match.group(1)!;
+      final base58EncodedPublicKeyString = match.group(2)!;
+      final sigBytes = bytesString.split(', ').map(int.parse).toList();
+
+      List<int> pubKeyBytes = base58decode(base58EncodedPublicKeyString);
+
+      return [sigBytes, pubKeyBytes];
+    } else {
+      throw const FormatException('Invalid Signature string format');
+    }
+  }
+
+  @override
+  Future<bool> verifyMessage(String message, String signature, {String? address}) async {
+    String signatureString = utf8.decode(HEX.decode(signature));
+
+    List<List<int>> bytes = bytesFromSigString(signatureString);
+
+    final messageBytes = utf8.encode(message);
+    final sigBytes = bytes[0];
+    final pubKeyBytes = bytes[1];
+
+    if (address == null) {
+      return false;
+    }
+
+    // make sure the address derived from the public key provided matches the one we expect
+    final pub = Ed25519HDPublicKey(pubKeyBytes);
+    if (address != pub.toBase58()) {
+      return false;
+    }
+
+    return await verifySignature(
+      message: messageBytes,
+      signature: sigBytes,
+      publicKey: Ed25519HDPublicKey(pubKeyBytes),
+    );
   }
 
   SolanaClient? get solanaClient => _client.getSolanaClient;