53 lines
1.9 KiB
Dart
53 lines
1.9 KiB
Dart
/*
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* Famedly Matrix SDK
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* Copyright (C) 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 'package:canonical_json/canonical_json.dart';
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import 'package:vodozemac/vodozemac.dart' as vod;
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import 'package:matrix/matrix.dart';
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extension JsonSignatureCheckExtension on Map<String, dynamic> {
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/// Checks the signature of a signed json object.
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bool checkJsonSignature(String key, String userId, String deviceId) {
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final signatures = this['signatures'];
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if (signatures == null ||
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signatures is! Map<String, dynamic> ||
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!signatures.containsKey(userId)) {
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return false;
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}
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remove('unsigned');
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remove('signatures');
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if (!signatures[userId].containsKey('ed25519:$deviceId')) return false;
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final String signature = signatures[userId]['ed25519:$deviceId'];
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final canonical = canonicalJson.encode(this);
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final message = String.fromCharCodes(canonical);
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var isValid = false;
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try {
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vod.Ed25519PublicKey.fromBase64(key).verify(
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message: message,
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signature: vod.Ed25519Signature.fromBase64(signature),
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);
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isValid = true;
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} catch (e, s) {
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isValid = false;
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Logs().w('[LibOlm] Signature check failed', e, s);
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}
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return isValid;
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}
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}
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