Encrypted messaging app
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import 'dart:convert';
import 'dart:typed_data';
import 'package:pointycastle/export.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/encryption/crypto_utils.dart';
import '/utils/storage/database.dart';
Friend findFriendByFriendId(List<Friend> friends, String id) {
for (var friend in friends) {
if (friend.friendId == id) {
return friend;
}
}
// Or return `null`.
throw ArgumentError.value(id, 'id', 'No element with that id');
}
Future<Friend> getFriendByFriendId(String userId) async {
final db = await getDatabaseConnection();
final List<Map<String, dynamic>> maps = await db.query(
'friends',
where: 'friend_id = ?',
whereArgs: [userId],
);
if (maps.length != 1) {
throw ArgumentError('Invalid user id');
}
return Friend(
id: maps[0]['id'],
userId: maps[0]['user_id'],
friendId: maps[0]['friend_id'],
friendSymmetricKey: maps[0]['symmetric_key'],
publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[0]['asymmetric_public_key']),
acceptedAt: maps[0]['accepted_at'] != null ? DateTime.parse(maps[0]['accepted_at']) : null,
username: maps[0]['username'],
);
}
Future<List<Friend>> getFriends({bool? accepted}) async {
final db = await getDatabaseConnection();
String? where;
if (accepted == true) {
where = 'accepted_at IS NOT NULL';
}
if (accepted == false) {
where = 'accepted_at IS NULL';
}
final List<Map<String, dynamic>> maps = await db.query(
'friends',
where: where,
);
return List.generate(maps.length, (i) {
return Friend(
id: maps[i]['id'],
userId: maps[i]['user_id'],
friendId: maps[i]['friend_id'],
friendSymmetricKey: maps[i]['symmetric_key'],
publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[i]['asymmetric_public_key']),
acceptedAt: maps[i]['accepted_at'] != null ? DateTime.parse(maps[i]['accepted_at']) : null,
username: maps[i]['username'],
);
});
}
class Friend{
String id;
String userId;
String username;
String friendId;
String friendSymmetricKey;
RSAPublicKey publicKey;
DateTime? acceptedAt;
bool? selected;
Friend({
required this.id,
required this.userId,
required this.username,
required this.friendId,
required this.friendSymmetricKey,
required this.publicKey,
required this.acceptedAt,
this.selected,
});
factory Friend.fromJson(Map<String, dynamic> json, RSAPrivateKey privKey) {
Uint8List idDecrypted = CryptoUtils.rsaDecrypt(
base64.decode(json['friend_id']),
privKey,
);
Uint8List username = CryptoUtils.rsaDecrypt(
base64.decode(json['friend_username']),
privKey,
);
Uint8List symmetricKeyDecrypted = CryptoUtils.rsaDecrypt(
base64.decode(json['symmetric_key']),
privKey,
);
String publicKeyString = AesHelper.aesDecrypt(
symmetricKeyDecrypted,
base64.decode(json['asymmetric_public_key'])
);
RSAPublicKey publicKey = CryptoUtils.rsaPublicKeyFromPem(publicKeyString);
return Friend(
id: json['id'],
userId: json['user_id'],
username: String.fromCharCodes(username),
friendId: String.fromCharCodes(idDecrypted),
friendSymmetricKey: base64.encode(symmetricKeyDecrypted),
publicKey: publicKey,
acceptedAt: json['accepted_at']['Valid'] ?
DateTime.parse(json['accepted_at']['Time']) :
null,
);
}
String publicKeyPem() {
return CryptoUtils.encodeRSAPublicKeyToPem(publicKey);
}
Map<String, dynamic> toMap() {
return {
'id': id,
'user_id': userId,
'username': username,
'friend_id': friendId,
'symmetric_key': friendSymmetricKey,
'asymmetric_public_key': publicKeyPem(),
'accepted_at': acceptedAt?.toIso8601String(),
};
}
@override
String toString() {
return '''
id: $id
userId: $userId
username: $username
friendId: $friendId
accepted_at: $acceptedAt''';
}
}