feat: Guard against malformed ciphertext

2023-06-15 16:42:17 +02:00
parent f1ec8d1793
commit 6c301ab88f
5 changed files with 42 additions and 30 deletions
--- a/lib/src/double_ratchet/double_ratchet.dart
+++ b/lib/src/double_ratchet/double_ratchet.dart
@@ -261,7 +261,11 @@ class OmemoDoubleRatchet {
    }

    final plaintext = await aes256CbcDecrypt(ciphertext, keys.encryptionKey, keys.iv);
-    return Result(plaintext);
+    if (plaintext.isType<MalformedCiphertextError>()) {
+      return Result(plaintext.get<MalformedCiphertextError>());
+    }
+
+    return Result(plaintext.get<List<int>>());
  }

  /// Checks whether we could decrypt the payload in [header] with a skipped key. If yes,