Encrypted messaging app
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import 'dart:convert';
import 'dart:typed_data';
import 'package:pointycastle/impl.dart';
import '/database/models/conversations.dart';
import '/utils/storage/database.dart';
import '/utils/encryption/aes_helper.dart';
import '/utils/encryption/crypto_utils.dart';
Future<ConversationUser> getConversationUser(Conversation conversation, String userId) async {
final db = await getDatabaseConnection();
final List<Map<String, dynamic>> maps = await db.query(
'conversation_users',
where: 'conversation_id = ? AND user_id = ?',
whereArgs: [ conversation.id, userId ],
);
if (maps.length != 1) {
throw ArgumentError('Invalid conversation_id or username');
}
return ConversationUser(
id: maps[0]['id'],
userId: maps[0]['user_id'],
conversationId: maps[0]['conversation_id'],
username: maps[0]['username'],
associationKey: maps[0]['association_key'],
publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[0]['asymmetric_public_key']),
admin: maps[0]['admin'] == 1,
);
}
// A method that retrieves all the dogs from the dogs table.
Future<List<ConversationUser>> getConversationUsers(Conversation conversation) async {
final db = await getDatabaseConnection();
final List<Map<String, dynamic>> maps = await db.query(
'conversation_users',
where: 'conversation_id = ?',
whereArgs: [ conversation.id ],
orderBy: 'username',
);
List<ConversationUser> conversationUsers = List.generate(maps.length, (i) {
return ConversationUser(
id: maps[i]['id'],
userId: maps[i]['user_id'],
conversationId: maps[i]['conversation_id'],
username: maps[i]['username'],
associationKey: maps[i]['association_key'],
publicKey: CryptoUtils.rsaPublicKeyFromPem(maps[i]['asymmetric_public_key']),
admin: maps[i]['admin'] == 1,
);
});
int index = 0;
List<ConversationUser> finalConversationUsers = [];
for (ConversationUser conversationUser in conversationUsers) {
if (!conversationUser.admin) {
finalConversationUsers.add(conversationUser);
continue;
}
finalConversationUsers.insert(index, conversationUser);
index++;
}
return finalConversationUsers;
}
Future<List<Map<String, dynamic>>> getEncryptedConversationUsers(Conversation conversation, Uint8List symKey) async {
final db = await getDatabaseConnection();
final List<Map<String, dynamic>> maps = await db.query(
'conversation_users',
where: 'conversation_id = ?',
whereArgs: [conversation.id],
orderBy: 'username',
);
List<Map<String, dynamic>> conversationUsers = List.generate(maps.length, (i) {
return {
'id': maps[i]['id'],
'conversation_id': maps[i]['conversation_id'],
'user_id': AesHelper.aesEncrypt(symKey, Uint8List.fromList(maps[i]['user_id'].codeUnits)),
'username': AesHelper.aesEncrypt(symKey, Uint8List.fromList(maps[i]['username'].codeUnits)),
'association_key': AesHelper.aesEncrypt(symKey, Uint8List.fromList(maps[i]['association_key'].codeUnits)),
'public_key': AesHelper.aesEncrypt(symKey, Uint8List.fromList(maps[i]['asymmetric_public_key'].codeUnits)),
'admin': AesHelper.aesEncrypt(symKey, Uint8List.fromList((maps[i]['admin'] == 1 ? 'true' : 'false').codeUnits)),
};
});
return conversationUsers;
}
class ConversationUser{
String id;
String userId;
String conversationId;
String username;
String associationKey;
RSAPublicKey publicKey;
bool admin;
ConversationUser({
required this.id,
required this.userId,
required this.conversationId,
required this.username,
required this.associationKey,
required this.publicKey,
required this.admin,
});
factory ConversationUser.fromJson(Map<String, dynamic> json, Uint8List symmetricKey) {
String userId = AesHelper.aesDecrypt(
symmetricKey,
base64.decode(json['user_id']),
);
String username = AesHelper.aesDecrypt(
symmetricKey,
base64.decode(json['username']),
);
String associationKey = AesHelper.aesDecrypt(
symmetricKey,
base64.decode(json['association_key']),
);
String admin = AesHelper.aesDecrypt(
symmetricKey,
base64.decode(json['admin']),
);
String publicKeyString = AesHelper.aesDecrypt(
symmetricKey,
base64.decode(json['public_key']),
);
RSAPublicKey publicKey = CryptoUtils.rsaPublicKeyFromPem(publicKeyString);
return ConversationUser(
id: json['id'],
conversationId: json['conversation_detail_id'],
userId: userId,
username: username,
associationKey: associationKey,
publicKey: publicKey,
admin: admin == 'true',
);
}
Map<String, dynamic> toJson() {
return {
'id': id,
'user_id': userId,
'username': username,
'association_key': associationKey,
'asymmetric_public_key': publicKeyPem(),
'admin': admin ? 'true' : 'false',
};
}
Map<String, dynamic> toMap() {
return {
'id': id,
'user_id': userId,
'conversation_id': conversationId,
'username': username,
'association_key': associationKey,
'asymmetric_public_key': publicKeyPem(),
'admin': admin ? 1 : 0,
};
}
String publicKeyPem() {
return CryptoUtils.encodeRSAPublicKeyToPem(publicKey);
}
}