61 lines
1.8 KiB
Dart
61 lines
1.8 KiB
Dart
/*
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* Famedly Matrix SDK
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* Copyright (C) 2019, 2020, 2021 Famedly GmbH
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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import 'dart:typed_data';
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import 'dart:convert';
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import 'package:matrix/encryption/utils/base64_unpadded.dart';
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import 'crypto.dart';
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class EncryptedFile {
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EncryptedFile({
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required this.data,
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required this.k,
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required this.iv,
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required this.sha256,
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});
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Uint8List data;
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String k;
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String iv;
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String sha256;
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}
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Future<EncryptedFile> encryptFile(Uint8List input) async {
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final key = secureRandomBytes(32);
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final iv = secureRandomBytes(16);
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final data = await aesCtr.encrypt(input, key, iv);
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final hash = await sha256(data);
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return EncryptedFile(
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data: data,
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k: base64Url.encode(key).replaceAll('=', ''),
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iv: base64.encode(iv).replaceAll('=', ''),
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sha256: base64.encode(hash).replaceAll('=', ''),
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);
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}
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Future<Uint8List?> decryptFile(EncryptedFile input) async {
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if (base64.encode(await sha256(input.data)) !=
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base64.normalize(input.sha256)) {
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return null;
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}
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final key = base64decodeUnpadded(base64.normalize(input.k));
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final iv = base64decodeUnpadded(base64.normalize(input.iv));
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return await aesCtr.encrypt(input.data, key, iv);
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}
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