PapaTutuWawa/omemo_dart
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fix: Throw a custom exception

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This commit is contained in:
PapaTutuWawa 2022-08-03 16:44:18 +02:00
parent 8d222a160f
commit 45d0c57305
2 changed files with 8 additions and 2 deletions
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4
lib/src/double_ratchet.dart
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@ -3,6 +3,7 @@ import 'package:meta/meta.dart';
import 'package:omemo_dart/protobuf/schema.pb.dart'; import 'package:omemo_dart/protobuf/schema.pb.dart';
import 'package:omemo_dart/src/double_ratchet/crypto.dart'; import 'package:omemo_dart/src/double_ratchet/crypto.dart';
import 'package:omemo_dart/src/double_ratchet/kdf.dart'; import 'package:omemo_dart/src/double_ratchet/kdf.dart';
import 'package:omemo_dart/src/errors.dart';
import 'package:omemo_dart/src/helpers.dart'; import 'package:omemo_dart/src/helpers.dart';
import 'package:omemo_dart/src/key.dart'; import 'package:omemo_dart/src/key.dart';
import 'package:omemo_dart/src/x3dh.dart'; import 'package:omemo_dart/src/x3dh.dart';
@ -142,8 +143,7 @@ class OmemoDoubleRatchet {
Future<void> skipMessageKeys(int until) async { Future<void> skipMessageKeys(int until) async {
if (nr + maxSkip < until) { if (nr + maxSkip < until) {
// TODO(PapaTutuWawa): Custom exception throw SkippingTooManyMessagesException();
throw Exception();
} }
if (ckr != null) { if (ckr != null) {

6
lib/src/errors.dart
View File

@ -7,3 +7,9 @@ class InvalidSignatureException implements Exception {
class InvalidMessageHMACException implements Exception { class InvalidMessageHMACException implements Exception {
String errMsg() => 'The computed HMAC does not match the provided HMAC'; String errMsg() => 'The computed HMAC does not match the provided HMAC';
} }
/// Triggered by the Double Ratchet if skipping messages would cause skipping more than
/// MAXSKIP messages
class SkippingTooManyMessagesException implements Exception {
String errMsg() => 'Skipping messages would cause a skip bigger than MAXSKIP';
}