✨ Keypair Infra

ios/Podfile.lock

@@ -37,6 +37,8 @@ PODS:
   - DKPhotoGallery/Resource (0.0.19):
     - SDWebImage
     - SwiftyGif
+  - fast_rsa (0.6.0):
+    - Flutter
   - file_picker (0.0.1):
     - DKImagePickerController/PhotoGallery
     - Flutter
@@ -262,6 +264,7 @@ DEPENDENCIES:
   - connectivity_plus (from `.symlinks/plugins/connectivity_plus/ios`)
   - croppy (from `.symlinks/plugins/croppy/ios`)
   - device_info_plus (from `.symlinks/plugins/device_info_plus/ios`)
+  - fast_rsa (from `.symlinks/plugins/fast_rsa/ios`)
   - file_picker (from `.symlinks/plugins/file_picker/ios`)
   - file_saver (from `.symlinks/plugins/file_saver/ios`)
   - firebase_analytics (from `.symlinks/plugins/firebase_analytics/ios`)
@@ -331,6 +334,8 @@ EXTERNAL SOURCES:
     :path: ".symlinks/plugins/croppy/ios"
   device_info_plus:
     :path: ".symlinks/plugins/device_info_plus/ios"
+  fast_rsa:
+    :path: ".symlinks/plugins/fast_rsa/ios"
   file_picker:
     :path: ".symlinks/plugins/file_picker/ios"
   file_saver:
@@ -411,6 +416,7 @@ SPEC CHECKSUMS:
   device_info_plus: bf2e3232933866d73fe290f2942f2156cdd10342
   DKImagePickerController: 946cec48c7873164274ecc4624d19e3da4c1ef3c
   DKPhotoGallery: b3834fecb755ee09a593d7c9e389d8b5d6deed60
+  fast_rsa: dc48fb05f26bb108863de122b2a9f5554e8e2591
   file_picker: b159e0c068aef54932bb15dc9fd1571818edaf49
   file_saver: 503e386464dbe118f630e17b4c2e1190fa0cf808
   Firebase: d80354ed7f6df5f9aca55e9eb47cc4b634735eaf

lib/database/database.g.dart

@@ -538,6 +538,282 @@ class SnLocalChatMessageCompanion
   }
 }
 
+class $SnLocalKeyPairTable extends SnLocalKeyPair
+    with TableInfo<$SnLocalKeyPairTable, SnLocalKeyPairData> {
+  @override
+  final GeneratedDatabase attachedDatabase;
+  final String? _alias;
+  $SnLocalKeyPairTable(this.attachedDatabase, [this._alias]);
+  static const VerificationMeta _idMeta = const VerificationMeta('id');
+  @override
+  late final GeneratedColumn<String> id = GeneratedColumn<String>(
+      'id', aliasedName, false,
+      type: DriftSqlType.string, requiredDuringInsert: true);
+  static const VerificationMeta _accountIdMeta =
+      const VerificationMeta('accountId');
+  @override
+  late final GeneratedColumn<int> accountId = GeneratedColumn<int>(
+      'account_id', aliasedName, false,
+      type: DriftSqlType.int, requiredDuringInsert: true);
+  static const VerificationMeta _publicKeyMeta =
+      const VerificationMeta('publicKey');
+  @override
+  late final GeneratedColumn<String> publicKey = GeneratedColumn<String>(
+      'public_key', aliasedName, false,
+      type: DriftSqlType.string, requiredDuringInsert: true);
+  static const VerificationMeta _privateKeyMeta =
+      const VerificationMeta('privateKey');
+  @override
+  late final GeneratedColumn<String> privateKey = GeneratedColumn<String>(
+      'private_key', aliasedName, true,
+      type: DriftSqlType.string, requiredDuringInsert: false);
+  @override
+  List<GeneratedColumn> get $columns => [id, accountId, publicKey, privateKey];
+  @override
+  String get aliasedName => _alias ?? actualTableName;
+  @override
+  String get actualTableName => $name;
+  static const String $name = 'sn_local_key_pair';
+  @override
+  VerificationContext validateIntegrity(Insertable<SnLocalKeyPairData> instance,
+      {bool isInserting = false}) {
+    final context = VerificationContext();
+    final data = instance.toColumns(true);
+    if (data.containsKey('id')) {
+      context.handle(_idMeta, id.isAcceptableOrUnknown(data['id']!, _idMeta));
+    } else if (isInserting) {
+      context.missing(_idMeta);
+    }
+    if (data.containsKey('account_id')) {
+      context.handle(_accountIdMeta,
+          accountId.isAcceptableOrUnknown(data['account_id']!, _accountIdMeta));
+    } else if (isInserting) {
+      context.missing(_accountIdMeta);
+    }
+    if (data.containsKey('public_key')) {
+      context.handle(_publicKeyMeta,
+          publicKey.isAcceptableOrUnknown(data['public_key']!, _publicKeyMeta));
+    } else if (isInserting) {
+      context.missing(_publicKeyMeta);
+    }
+    if (data.containsKey('private_key')) {
+      context.handle(
+          _privateKeyMeta,
+          privateKey.isAcceptableOrUnknown(
+              data['private_key']!, _privateKeyMeta));
+    }
+    return context;
+  }
+
+  @override
+  Set<GeneratedColumn> get $primaryKey => const {};
+  @override
+  SnLocalKeyPairData map(Map<String, dynamic> data, {String? tablePrefix}) {
+    final effectivePrefix = tablePrefix != null ? '$tablePrefix.' : '';
+    return SnLocalKeyPairData(
+      id: attachedDatabase.typeMapping
+          .read(DriftSqlType.string, data['${effectivePrefix}id'])!,
+      accountId: attachedDatabase.typeMapping
+          .read(DriftSqlType.int, data['${effectivePrefix}account_id'])!,
+      publicKey: attachedDatabase.typeMapping
+          .read(DriftSqlType.string, data['${effectivePrefix}public_key'])!,
+      privateKey: attachedDatabase.typeMapping
+          .read(DriftSqlType.string, data['${effectivePrefix}private_key']),
+    );
+  }
+
+  @override
+  $SnLocalKeyPairTable createAlias(String alias) {
+    return $SnLocalKeyPairTable(attachedDatabase, alias);
+  }
+}
+
+class SnLocalKeyPairData extends DataClass
+    implements Insertable<SnLocalKeyPairData> {
+  final String id;
+  final int accountId;
+  final String publicKey;
+  final String? privateKey;
+  const SnLocalKeyPairData(
+      {required this.id,
+      required this.accountId,
+      required this.publicKey,
+      this.privateKey});
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    map['id'] = Variable<String>(id);
+    map['account_id'] = Variable<int>(accountId);
+    map['public_key'] = Variable<String>(publicKey);
+    if (!nullToAbsent || privateKey != null) {
+      map['private_key'] = Variable<String>(privateKey);
+    }
+    return map;
+  }
+
+  SnLocalKeyPairCompanion toCompanion(bool nullToAbsent) {
+    return SnLocalKeyPairCompanion(
+      id: Value(id),
+      accountId: Value(accountId),
+      publicKey: Value(publicKey),
+      privateKey: privateKey == null && nullToAbsent
+          ? const Value.absent()
+          : Value(privateKey),
+    );
+  }
+
+  factory SnLocalKeyPairData.fromJson(Map<String, dynamic> json,
+      {ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return SnLocalKeyPairData(
+      id: serializer.fromJson<String>(json['id']),
+      accountId: serializer.fromJson<int>(json['accountId']),
+      publicKey: serializer.fromJson<String>(json['publicKey']),
+      privateKey: serializer.fromJson<String?>(json['privateKey']),
+    );
+  }
+  @override
+  Map<String, dynamic> toJson({ValueSerializer? serializer}) {
+    serializer ??= driftRuntimeOptions.defaultSerializer;
+    return <String, dynamic>{
+      'id': serializer.toJson<String>(id),
+      'accountId': serializer.toJson<int>(accountId),
+      'publicKey': serializer.toJson<String>(publicKey),
+      'privateKey': serializer.toJson<String?>(privateKey),
+    };
+  }
+
+  SnLocalKeyPairData copyWith(
+          {String? id,
+          int? accountId,
+          String? publicKey,
+          Value<String?> privateKey = const Value.absent()}) =>
+      SnLocalKeyPairData(
+        id: id ?? this.id,
+        accountId: accountId ?? this.accountId,
+        publicKey: publicKey ?? this.publicKey,
+        privateKey: privateKey.present ? privateKey.value : this.privateKey,
+      );
+  SnLocalKeyPairData copyWithCompanion(SnLocalKeyPairCompanion data) {
+    return SnLocalKeyPairData(
+      id: data.id.present ? data.id.value : this.id,
+      accountId: data.accountId.present ? data.accountId.value : this.accountId,
+      publicKey: data.publicKey.present ? data.publicKey.value : this.publicKey,
+      privateKey:
+          data.privateKey.present ? data.privateKey.value : this.privateKey,
+    );
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('SnLocalKeyPairData(')
+          ..write('id: $id, ')
+          ..write('accountId: $accountId, ')
+          ..write('publicKey: $publicKey, ')
+          ..write('privateKey: $privateKey')
+          ..write(')'))
+        .toString();
+  }
+
+  @override
+  int get hashCode => Object.hash(id, accountId, publicKey, privateKey);
+  @override
+  bool operator ==(Object other) =>
+      identical(this, other) ||
+      (other is SnLocalKeyPairData &&
+          other.id == this.id &&
+          other.accountId == this.accountId &&
+          other.publicKey == this.publicKey &&
+          other.privateKey == this.privateKey);
+}
+
+class SnLocalKeyPairCompanion extends UpdateCompanion<SnLocalKeyPairData> {
+  final Value<String> id;
+  final Value<int> accountId;
+  final Value<String> publicKey;
+  final Value<String?> privateKey;
+  final Value<int> rowid;
+  const SnLocalKeyPairCompanion({
+    this.id = const Value.absent(),
+    this.accountId = const Value.absent(),
+    this.publicKey = const Value.absent(),
+    this.privateKey = const Value.absent(),
+    this.rowid = const Value.absent(),
+  });
+  SnLocalKeyPairCompanion.insert({
+    required String id,
+    required int accountId,
+    required String publicKey,
+    this.privateKey = const Value.absent(),
+    this.rowid = const Value.absent(),
+  })  : id = Value(id),
+        accountId = Value(accountId),
+        publicKey = Value(publicKey);
+  static Insertable<SnLocalKeyPairData> custom({
+    Expression<String>? id,
+    Expression<int>? accountId,
+    Expression<String>? publicKey,
+    Expression<String>? privateKey,
+    Expression<int>? rowid,
+  }) {
+    return RawValuesInsertable({
+      if (id != null) 'id': id,
+      if (accountId != null) 'account_id': accountId,
+      if (publicKey != null) 'public_key': publicKey,
+      if (privateKey != null) 'private_key': privateKey,
+      if (rowid != null) 'rowid': rowid,
+    });
+  }
+
+  SnLocalKeyPairCompanion copyWith(
+      {Value<String>? id,
+      Value<int>? accountId,
+      Value<String>? publicKey,
+      Value<String?>? privateKey,
+      Value<int>? rowid}) {
+    return SnLocalKeyPairCompanion(
+      id: id ?? this.id,
+      accountId: accountId ?? this.accountId,
+      publicKey: publicKey ?? this.publicKey,
+      privateKey: privateKey ?? this.privateKey,
+      rowid: rowid ?? this.rowid,
+    );
+  }
+
+  @override
+  Map<String, Expression> toColumns(bool nullToAbsent) {
+    final map = <String, Expression>{};
+    if (id.present) {
+      map['id'] = Variable<String>(id.value);
+    }
+    if (accountId.present) {
+      map['account_id'] = Variable<int>(accountId.value);
+    }
+    if (publicKey.present) {
+      map['public_key'] = Variable<String>(publicKey.value);
+    }
+    if (privateKey.present) {
+      map['private_key'] = Variable<String>(privateKey.value);
+    }
+    if (rowid.present) {
+      map['rowid'] = Variable<int>(rowid.value);
+    }
+    return map;
+  }
+
+  @override
+  String toString() {
+    return (StringBuffer('SnLocalKeyPairCompanion(')
+          ..write('id: $id, ')
+          ..write('accountId: $accountId, ')
+          ..write('publicKey: $publicKey, ')
+          ..write('privateKey: $privateKey, ')
+          ..write('rowid: $rowid')
+          ..write(')'))
+        .toString();
+  }
+}
+
 abstract class _$AppDatabase extends GeneratedDatabase {
   _$AppDatabase(QueryExecutor e) : super(e);
   $AppDatabaseManager get managers => $AppDatabaseManager(this);
@@ -545,12 +821,13 @@ abstract class _$AppDatabase extends GeneratedDatabase {
       $SnLocalChatChannelTable(this);
   late final $SnLocalChatMessageTable snLocalChatMessage =
       $SnLocalChatMessageTable(this);
+  late final $SnLocalKeyPairTable snLocalKeyPair = $SnLocalKeyPairTable(this);
   @override
   Iterable<TableInfo<Table, Object?>> get allTables =>
       allSchemaEntities.whereType<TableInfo<Table, Object?>>();
   @override
   List<DatabaseSchemaEntity> get allSchemaEntities =>
-      [snLocalChatChannel, snLocalChatMessage];
+      [snLocalChatChannel, snLocalChatMessage, snLocalKeyPair];
 }
 
 typedef $$SnLocalChatChannelTableCreateCompanionBuilder
@@ -869,6 +1146,165 @@ typedef $$SnLocalChatMessageTableProcessedTableManager = ProcessedTableManager<
     ),
     SnLocalChatMessageData,
     PrefetchHooks Function()>;
+typedef $$SnLocalKeyPairTableCreateCompanionBuilder = SnLocalKeyPairCompanion
+    Function({
+  required String id,
+  required int accountId,
+  required String publicKey,
+  Value<String?> privateKey,
+  Value<int> rowid,
+});
+typedef $$SnLocalKeyPairTableUpdateCompanionBuilder = SnLocalKeyPairCompanion
+    Function({
+  Value<String> id,
+  Value<int> accountId,
+  Value<String> publicKey,
+  Value<String?> privateKey,
+  Value<int> rowid,
+});
+
+class $$SnLocalKeyPairTableFilterComposer
+    extends Composer<_$AppDatabase, $SnLocalKeyPairTable> {
+  $$SnLocalKeyPairTableFilterComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  ColumnFilters<String> get id => $composableBuilder(
+      column: $table.id, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<int> get accountId => $composableBuilder(
+      column: $table.accountId, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<String> get publicKey => $composableBuilder(
+      column: $table.publicKey, builder: (column) => ColumnFilters(column));
+
+  ColumnFilters<String> get privateKey => $composableBuilder(
+      column: $table.privateKey, builder: (column) => ColumnFilters(column));
+}
+
+class $$SnLocalKeyPairTableOrderingComposer
+    extends Composer<_$AppDatabase, $SnLocalKeyPairTable> {
+  $$SnLocalKeyPairTableOrderingComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  ColumnOrderings<String> get id => $composableBuilder(
+      column: $table.id, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<int> get accountId => $composableBuilder(
+      column: $table.accountId, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get publicKey => $composableBuilder(
+      column: $table.publicKey, builder: (column) => ColumnOrderings(column));
+
+  ColumnOrderings<String> get privateKey => $composableBuilder(
+      column: $table.privateKey, builder: (column) => ColumnOrderings(column));
+}
+
+class $$SnLocalKeyPairTableAnnotationComposer
+    extends Composer<_$AppDatabase, $SnLocalKeyPairTable> {
+  $$SnLocalKeyPairTableAnnotationComposer({
+    required super.$db,
+    required super.$table,
+    super.joinBuilder,
+    super.$addJoinBuilderToRootComposer,
+    super.$removeJoinBuilderFromRootComposer,
+  });
+  GeneratedColumn<String> get id =>
+      $composableBuilder(column: $table.id, builder: (column) => column);
+
+  GeneratedColumn<int> get accountId =>
+      $composableBuilder(column: $table.accountId, builder: (column) => column);
+
+  GeneratedColumn<String> get publicKey =>
+      $composableBuilder(column: $table.publicKey, builder: (column) => column);
+
+  GeneratedColumn<String> get privateKey => $composableBuilder(
+      column: $table.privateKey, builder: (column) => column);
+}
+
+class $$SnLocalKeyPairTableTableManager extends RootTableManager<
+    _$AppDatabase,
+    $SnLocalKeyPairTable,
+    SnLocalKeyPairData,
+    $$SnLocalKeyPairTableFilterComposer,
+    $$SnLocalKeyPairTableOrderingComposer,
+    $$SnLocalKeyPairTableAnnotationComposer,
+    $$SnLocalKeyPairTableCreateCompanionBuilder,
+    $$SnLocalKeyPairTableUpdateCompanionBuilder,
+    (
+      SnLocalKeyPairData,
+      BaseReferences<_$AppDatabase, $SnLocalKeyPairTable, SnLocalKeyPairData>
+    ),
+    SnLocalKeyPairData,
+    PrefetchHooks Function()> {
+  $$SnLocalKeyPairTableTableManager(
+      _$AppDatabase db, $SnLocalKeyPairTable table)
+      : super(TableManagerState(
+          db: db,
+          table: table,
+          createFilteringComposer: () =>
+              $$SnLocalKeyPairTableFilterComposer($db: db, $table: table),
+          createOrderingComposer: () =>
+              $$SnLocalKeyPairTableOrderingComposer($db: db, $table: table),
+          createComputedFieldComposer: () =>
+              $$SnLocalKeyPairTableAnnotationComposer($db: db, $table: table),
+          updateCompanionCallback: ({
+            Value<String> id = const Value.absent(),
+            Value<int> accountId = const Value.absent(),
+            Value<String> publicKey = const Value.absent(),
+            Value<String?> privateKey = const Value.absent(),
+            Value<int> rowid = const Value.absent(),
+          }) =>
+              SnLocalKeyPairCompanion(
+            id: id,
+            accountId: accountId,
+            publicKey: publicKey,
+            privateKey: privateKey,
+            rowid: rowid,
+          ),
+          createCompanionCallback: ({
+            required String id,
+            required int accountId,
+            required String publicKey,
+            Value<String?> privateKey = const Value.absent(),
+            Value<int> rowid = const Value.absent(),
+          }) =>
+              SnLocalKeyPairCompanion.insert(
+            id: id,
+            accountId: accountId,
+            publicKey: publicKey,
+            privateKey: privateKey,
+            rowid: rowid,
+          ),
+          withReferenceMapper: (p0) => p0
+              .map((e) => (e.readTable(table), BaseReferences(db, table, e)))
+              .toList(),
+          prefetchHooksCallback: null,
+        ));
+}
+
+typedef $$SnLocalKeyPairTableProcessedTableManager = ProcessedTableManager<
+    _$AppDatabase,
+    $SnLocalKeyPairTable,
+    SnLocalKeyPairData,
+    $$SnLocalKeyPairTableFilterComposer,
+    $$SnLocalKeyPairTableOrderingComposer,
+    $$SnLocalKeyPairTableAnnotationComposer,
+    $$SnLocalKeyPairTableCreateCompanionBuilder,
+    $$SnLocalKeyPairTableUpdateCompanionBuilder,
+    (
+      SnLocalKeyPairData,
+      BaseReferences<_$AppDatabase, $SnLocalKeyPairTable, SnLocalKeyPairData>
+    ),
+    SnLocalKeyPairData,
+    PrefetchHooks Function()>;
 
 class $AppDatabaseManager {
   final _$AppDatabase _db;
@@ -877,4 +1313,6 @@ class $AppDatabaseManager {
       $$SnLocalChatChannelTableTableManager(_db, _db.snLocalChatChannel);
   $$SnLocalChatMessageTableTableManager get snLocalChatMessage =>
       $$SnLocalChatMessageTableTableManager(_db, _db.snLocalChatMessage);
+  $$SnLocalKeyPairTableTableManager get snLocalKeyPair =>
+      $$SnLocalKeyPairTableTableManager(_db, _db.snLocalKeyPair);
 }

lib/database/keypair.dart

@@ -1,32 +1,4 @@
-import 'dart:convert';
-
 import 'package:drift/drift.dart';
-import 'package:surface/types/keypair.dart';
-
-class SnKeyPairConverter extends TypeConverter<SnKeyPair, String>
-    with JsonTypeConverter2<SnKeyPair, String, Map<String, Object?>> {
-  const SnKeyPairConverter();
-
-  @override
-  SnKeyPair fromSql(String fromDb) {
-    return fromJson(jsonDecode(fromDb) as Map<String, dynamic>);
-  }
-
-  @override
-  String toSql(SnKeyPair value) {
-    return jsonEncode(toJson(value));
-  }
-
-  @override
-  SnKeyPair fromJson(Map<String, Object?> json) {
-    return SnKeyPair.fromJson(json);
-  }
-
-  @override
-  Map<String, Object?> toJson(SnKeyPair value) {
-    return value.toJson();
-  }
-}
 
 class SnLocalKeyPair extends Table {
   TextColumn get id => text()();

lib/main.dart

@@ -25,6 +25,7 @@ import 'package:surface/providers/channel.dart';
 import 'package:surface/providers/chat_call.dart';
 import 'package:surface/providers/config.dart';
 import 'package:surface/providers/database.dart';
+import 'package:surface/providers/keypair.dart';
 import 'package:surface/providers/link_preview.dart';
 import 'package:surface/providers/navigation.dart';
 import 'package:surface/providers/notification.dart';
@@ -108,7 +109,8 @@ void main() async {
   }
 
   if (!kIsWeb && Platform.isAndroid) {
-    final ImagePickerPlatform imagePickerImplementation = ImagePickerPlatform.instance;
+    final ImagePickerPlatform imagePickerImplementation =
+        ImagePickerPlatform.instance;
     if (imagePickerImplementation is ImagePickerAndroid) {
       imagePickerImplementation.useAndroidPhotoPicker = true;
     }
@@ -160,6 +162,7 @@ class SolianApp extends StatelessWidget {
             Provider(create: (ctx) => SnStickerProvider(ctx)),
             ChangeNotifierProvider(create: (ctx) => UserProvider(ctx)),
             ChangeNotifierProvider(create: (ctx) => WebSocketProvider(ctx)),
+            Provider(create: (ctx) => KeyPairProvider(ctx)),
             ChangeNotifierProvider(create: (ctx) => NotificationProvider(ctx)),
             ChangeNotifierProvider(create: (ctx) => ChatChannelProvider(ctx)),
             ChangeNotifierProvider(create: (ctx) => ChatCallProvider(ctx)),
@@ -227,7 +230,8 @@ class _AppSplashScreenState extends State<_AppSplashScreen> with TrayListener {
     if (prefs.containsKey('first_boot_time')) {
       final rawTime = prefs.getString('first_boot_time');
       final time = DateTime.tryParse(rawTime ?? '');
-      if (time != null && time.isBefore(DateTime.now().subtract(const Duration(days: 3)))) {
+      if (time != null &&
+          time.isBefore(DateTime.now().subtract(const Duration(days: 3)))) {
         final inAppReview = InAppReview.instance;
         if (prefs.getBool('rating_requested') == true) return;
         if (await inAppReview.isAvailable()) {
@@ -258,12 +262,18 @@ class _AppSplashScreenState extends State<_AppSplashScreen> with TrayListener {
       final remoteVersionString = resp.data?['tag_name'] ?? '0.0.0+0';
       final remoteVersion = Version.parse(remoteVersionString.split('+').first);
       final localVersion = Version.parse(localVersionString.split('+').first);
-      final remoteBuildNumber = int.tryParse(remoteVersionString.split('+').last) ?? 0;
+      final remoteBuildNumber =
-      final localBuildNumber = int.tryParse(localVersionString.split('+').last) ?? 0;
+          int.tryParse(remoteVersionString.split('+').last) ?? 0;
-      logging.info("[Update] Local: $localVersionString, Remote: $remoteVersionString");
+      final localBuildNumber =
-      if ((remoteVersion > localVersion || remoteBuildNumber > localBuildNumber) && mounted) {
+          int.tryParse(localVersionString.split('+').last) ?? 0;
+      logging.info(
+          "[Update] Local: $localVersionString, Remote: $remoteVersionString");
+      if ((remoteVersion > localVersion ||
+              remoteBuildNumber > localBuildNumber) &&
+          mounted) {
         final config = context.read<ConfigProvider>();
-        config.setUpdate(remoteVersionString, resp.data?['body'] ?? 'No changelog');
+        config.setUpdate(
+            remoteVersionString, resp.data?['body'] ?? 'No changelog');
         logging.info("[Update] Update available: $remoteVersionString");
       }
     } catch (e) {
@@ -298,6 +308,9 @@ class _AppSplashScreenState extends State<_AppSplashScreen> with TrayListener {
       notify.listen();
       await notify.registerPushNotifications();
       if (!mounted) return;
+      final kp = context.read<KeyPairProvider>();
+      kp.listen();
+      if (!mounted) return;
       final sticker = context.read<SnStickerProvider>();
       await sticker.listSticker();
       logging.info('[Bootstrap] Everything initialized!');
@@ -355,7 +368,9 @@ class _AppSplashScreenState extends State<_AppSplashScreen> with TrayListener {
   Future<void> _trayInitialization() async {
     if (kIsWeb || Platform.isAndroid || Platform.isIOS) return;
 
-    final icon = Platform.isWindows ? 'assets/icon/tray-icon.ico' : 'assets/icon/tray-icon.png';
+    final icon = Platform.isWindows
+        ? 'assets/icon/tray-icon.ico'
+        : 'assets/icon/tray-icon.png';
     final appVersion = await PackageInfo.fromPlatform();
 
     trayManager.addListener(this);

lib/providers/keypair.dart

@@ -0,0 +1,211 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:drift/drift.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:surface/database/database.dart';
+import 'package:surface/logger.dart';
+import 'package:surface/providers/database.dart';
+import 'package:surface/providers/userinfo.dart';
+import 'package:surface/providers/websocket.dart';
+import 'package:surface/types/keypair.dart';
+import 'package:fast_rsa/fast_rsa.dart';
+import 'package:surface/types/websocket.dart';
+import 'package:uuid/uuid.dart';
+
+// Currently the keypair only provide RSA encryption
+// Supported by the `fast_rsa` package
+class KeyPairProvider {
+  late final DatabaseProvider _dt;
+  late final UserProvider _ua;
+  late final WebSocketProvider _ws;
+
+  SnKeyPair? activeKp;
+
+  KeyPairProvider(BuildContext context) {
+    _dt = context.read<DatabaseProvider>();
+    _ua = context.read<UserProvider>();
+    _ws = context.read<WebSocketProvider>();
+
+    reloadActive();
+  }
+
+  void listen() {
+    _ws.pk.stream.listen((event) {
+      switch (event.method) {
+        case 'kex.ack':
+          ackKeyExchange(event);
+          break;
+        case 'key.ask':
+          replyAskKeyExchange(event);
+          break;
+      }
+    });
+  }
+
+  Future<String> decryptText(String text, String kpId) async {
+    final kp = await (_dt.db.snLocalKeyPair.select()
+          ..where((e) => e.id.equals(kpId)))
+        .getSingleOrNull();
+    if (kp == null) throw Exception('Key pair not found');
+    return await RSA.decryptPKCS1v15(text, kp.privateKey!);
+  }
+
+  Future<String> encryptText(String text) async {
+    if (activeKp == null) throw Exception('No active key pair');
+    return await RSA.encryptPKCS1v15(text, activeKp!.publicKey);
+  }
+
+  final Map<String, Completer<SnKeyPair>> _requests = {};
+
+  Future<SnKeyPair> askKeyExchange(int kpOwner, String kpId) async {
+    if (_requests.containsKey(kpId)) return await _requests[kpId]!.future;
+
+    final completer = Completer<SnKeyPair>();
+    _requests[kpId] = completer;
+
+    _ws.conn?.sink.add(
+      jsonEncode(WebSocketPackage(
+        method: 'key.ask',
+        endpoint: 'id',
+        payload: {
+          'keypair_id': kpId,
+          'user_id': kpOwner,
+        },
+      )),
+    );
+
+    return Future.any([
+      _requests[kpId]!.future,
+      Future.delayed(const Duration(seconds: 60), () {
+        _requests.remove(kpId);
+        throw TimeoutException("Key exchange timed out");
+      }),
+    ]);
+  }
+
+  Future<void> ackKeyExchange(WebSocketPackage pkt) async {
+    if (pkt.payload == null) return;
+    final kpMeta = SnKeyPair(
+      id: pkt.payload!['keypair_id'] as String,
+      accountId: pkt.payload!['user_id'] as int,
+      publicKey: pkt.payload!['public_key'] as String,
+      privateKey: pkt.payload?['private_key'] as String?,
+    );
+
+    if (_requests.containsKey(kpMeta.id)) {
+      _requests[kpMeta.id]!.complete(kpMeta);
+      _requests.remove(kpMeta.id);
+    }
+
+    // Save the keypair to the local database
+    await _dt.db.snLocalKeyPair.insertOne(
+      SnLocalKeyPairCompanion.insert(
+        id: kpMeta.id,
+        accountId: kpMeta.accountId,
+        publicKey: kpMeta.publicKey,
+        privateKey: Value(kpMeta.privateKey),
+      ),
+      onConflict: DoUpdate(
+        (_) => SnLocalKeyPairCompanion.custom(
+          publicKey: Constant(kpMeta.publicKey),
+          privateKey: Constant(kpMeta.privateKey),
+        ),
+      ),
+    );
+  }
+
+  Future<void> replyAskKeyExchange(WebSocketPackage pkt) async {
+    final kpId = pkt.payload!['keypair_id'] as String;
+    final userId = pkt.payload!['user_id'] as int;
+    final clientId = pkt.payload!['client_id'] as String;
+
+    final localKp = await (_dt.db.snLocalKeyPair.select()
+          ..where((e) => e.id.equals(kpId))
+          ..limit(1))
+        .getSingleOrNull();
+    if (localKp == null) return;
+
+    logging.info(
+      '[Kex] Reply to key exchange request of $kpId from user $userId',
+    );
+
+    // We do not give the private key to the client
+    _ws.conn?.sink.add(jsonEncode(
+      WebSocketPackage(
+        method: 'kex.ack',
+        endpoint: 'id',
+        payload: {
+          'keypair_id': localKp.id,
+          'user_id': localKp.accountId,
+          'public_key': localKp.publicKey,
+          'client_id': clientId,
+        },
+      ).toJson(),
+    ));
+  }
+
+  Future<SnKeyPair?> reloadActive({bool autoEnroll = true}) async {
+    final kp = await (_dt.db.snLocalKeyPair.select()
+          ..where((e) => e.accountId.equals(_ua.user!.id))
+          ..where((e) => e.privateKey.isNotNull())
+          ..limit(1))
+        .getSingleOrNull();
+
+    if (kp != null) {
+      activeKp = SnKeyPair(
+        id: kp.id,
+        accountId: kp.accountId,
+        publicKey: kp.publicKey,
+        privateKey: kp.privateKey,
+      );
+    }
+
+    if (kp == null && autoEnroll) {
+      return await enrollNew();
+    }
+
+    return activeKp;
+  }
+
+  Future<SnKeyPair> enrollNew() async {
+    if (!_ua.isAuthorized) throw Exception('Unauthorized');
+
+    final existsOne = await (_dt.db.snLocalKeyPair.select()
+          ..where((e) => e.accountId.equals(_ua.user!.id))
+          ..where((e) => e.privateKey.isNotNull())
+          ..limit(1))
+        .getSingleOrNull();
+
+    final id = existsOne?.id ?? const Uuid().v4();
+    final kp = await RSA.generate(2048);
+    final kpMeta = SnKeyPair(
+      id: id,
+      accountId: _ua.user!.id,
+      publicKey: kp.publicKey,
+      privateKey: kp.privateKey,
+    );
+
+    // Save the keypair to the local database
+    // If there is already one with private key, it will be overwritten
+    await _dt.db.snLocalKeyPair.insertOne(
+      SnLocalKeyPairCompanion.insert(
+        id: kpMeta.id,
+        accountId: kpMeta.accountId,
+        publicKey: kpMeta.publicKey,
+        privateKey: Value(kpMeta.privateKey),
+      ),
+      onConflict: DoUpdate(
+        (_) => SnLocalKeyPairCompanion.custom(
+          publicKey: Constant(kpMeta.publicKey),
+          privateKey: Constant(kpMeta.privateKey),
+        ),
+      ),
+    );
+
+    await reloadActive(autoEnroll: false);
+
+    return kpMeta;
+  }
+}

lib/providers/websocket.dart

@@ -117,7 +117,8 @@ class WebSocketProvider extends ChangeNotifier {
       (event) {
         final packet = WebSocketPackage.fromJson(jsonDecode(event));
         logging.debug(
-            '[Websocket] Incoming message: ${packet.method} ${packet.message}');
+          '[Websocket] Incoming message: ${packet.method} ${packet.message}',
+        );
         pk.sink.add(packet);
       },
       onDone: () {

linux/flutter/generated_plugin_registrant.cc

@@ -7,6 +7,7 @@
 #include "generated_plugin_registrant.h"
 
 #include <bitsdojo_window_linux/bitsdojo_window_plugin.h>
+#include <fast_rsa/fast_rsa_plugin.h>
 #include <file_saver/file_saver_plugin.h>
 #include <file_selector_linux/file_selector_plugin.h>
 #include <flutter_timezone/flutter_timezone_plugin.h>
@@ -25,6 +26,9 @@ void fl_register_plugins(FlPluginRegistry* registry) {
   g_autoptr(FlPluginRegistrar) bitsdojo_window_linux_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "BitsdojoWindowPlugin");
   bitsdojo_window_plugin_register_with_registrar(bitsdojo_window_linux_registrar);
+  g_autoptr(FlPluginRegistrar) fast_rsa_registrar =
+      fl_plugin_registry_get_registrar_for_plugin(registry, "FastRsaPlugin");
+  fast_rsa_plugin_register_with_registrar(fast_rsa_registrar);
   g_autoptr(FlPluginRegistrar) file_saver_registrar =
       fl_plugin_registry_get_registrar_for_plugin(registry, "FileSaverPlugin");
   file_saver_plugin_register_with_registrar(file_saver_registrar);

linux/flutter/generated_plugins.cmake

@@ -4,6 +4,7 @@
 
 list(APPEND FLUTTER_PLUGIN_LIST
   bitsdojo_window_linux
+  fast_rsa
   file_saver
   file_selector_linux
   flutter_timezone

macos/Flutter/GeneratedPluginRegistrant.swift

@@ -8,6 +8,7 @@ import Foundation
 import bitsdojo_window_macos
 import connectivity_plus
 import device_info_plus
+import fast_rsa
 import file_picker
 import file_saver
 import file_selector_macos
@@ -43,6 +44,7 @@ func RegisterGeneratedPlugins(registry: FlutterPluginRegistry) {
   BitsdojoWindowPlugin.register(with: registry.registrar(forPlugin: "BitsdojoWindowPlugin"))
   ConnectivityPlusPlugin.register(with: registry.registrar(forPlugin: "ConnectivityPlusPlugin"))
   DeviceInfoPlusMacosPlugin.register(with: registry.registrar(forPlugin: "DeviceInfoPlusMacosPlugin"))
+  FastRsaPlugin.register(with: registry.registrar(forPlugin: "FastRsaPlugin"))
   FilePickerPlugin.register(with: registry.registrar(forPlugin: "FilePickerPlugin"))
   FileSaverPlugin.register(with: registry.registrar(forPlugin: "FileSaverPlugin"))
   FileSelectorPlugin.register(with: registry.registrar(forPlugin: "FileSelectorPlugin"))

pubspec.lock

@@ -513,6 +513,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "1.3.2"
+  fast_rsa:
+    dependency: "direct main"
+    description:
+      name: fast_rsa
+      sha256: "205a36c0412b9fabebf3e18ccb5221d819cc28cfb3da988c0bf7b646368d0270"
+      url: "https://pub.dev"
+    source: hosted
+    version: "3.8.0"
   ffi:
     dependency: transitive
     description:
@@ -665,6 +673,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.70.2"
+  flat_buffers:
+    dependency: transitive
+    description:
+      name: flat_buffers
+      sha256: "380bdcba5664a718bfd4ea20a45d39e13684f5318fcd8883066a55e21f37f4c3"
+      url: "https://pub.dev"
+    source: hosted
+    version: "23.5.26"
   flutter:
     dependency: "direct main"
     description: flutter

pubspec.yaml

@@ -137,6 +137,7 @@ dependencies:
   flutter_timezone: ^4.1.0
   flutter_map: ^8.1.0
   geolocator: ^13.0.2
+  fast_rsa: ^3.8.0
 
 dev_dependencies:
   flutter_test:

windows/flutter/generated_plugin_registrant.cc

@@ -8,6 +8,7 @@
 
 #include <bitsdojo_window_windows/bitsdojo_window_plugin.h>
 #include <connectivity_plus/connectivity_plus_windows_plugin.h>
+#include <fast_rsa/fast_rsa_plugin.h>
 #include <file_saver/file_saver_plugin.h>
 #include <file_selector_windows/file_selector_windows.h>
 #include <firebase_core/firebase_core_plugin_c_api.h>
@@ -35,6 +36,8 @@ void RegisterPlugins(flutter::PluginRegistry* registry) {
       registry->GetRegistrarForPlugin("BitsdojoWindowPlugin"));
   ConnectivityPlusWindowsPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("ConnectivityPlusWindowsPlugin"));
+  FastRsaPluginRegisterWithRegistrar(
+      registry->GetRegistrarForPlugin("FastRsaPlugin"));
   FileSaverPluginRegisterWithRegistrar(
       registry->GetRegistrarForPlugin("FileSaverPlugin"));
   FileSelectorWindowsRegisterWithRegistrar(

windows/flutter/generated_plugins.cmake

@@ -5,6 +5,7 @@
 list(APPEND FLUTTER_PLUGIN_LIST
   bitsdojo_window_windows
   connectivity_plus
+  fast_rsa
   file_saver
   file_selector_windows
   firebase_core