famedlysdk/lib/encryption/utils/json_signature_check_extens...

30 lines
1.1 KiB
Dart

import 'package:canonical_json/canonical_json.dart';
import 'package:famedlysdk/src/utils/logs.dart';
import 'package:olm/olm.dart' as olm;
extension JsonSignatureCheckExtension on Map<String, dynamic> {
/// Checks the signature of a signed json object.
bool checkJsonSignature(String key, String userId, String deviceId) {
final Map<String, dynamic> signatures = this['signatures'];
if (signatures == null || !signatures.containsKey(userId)) return false;
remove('unsigned');
remove('signatures');
if (!signatures[userId].containsKey('ed25519:$deviceId')) return false;
final String signature = signatures[userId]['ed25519:$deviceId'];
final canonical = canonicalJson.encode(this);
final message = String.fromCharCodes(canonical);
var isValid = false;
final olmutil = olm.Utility();
try {
olmutil.ed25519_verify(key, message, signature);
isValid = true;
} catch (e, s) {
isValid = false;
Logs.error('[LibOlm] Signature check failed: ' + e.toString(), s);
} finally {
olmutil.free();
}
return isValid;
}
}