fix: Fix some issues found by integrating

CHANGELOG.md

@@ -54,3 +54,14 @@
 ## 0.4.3
 
 - Fix bug that causes ratchets to be unable to decrypt anything after receiving a heartbeat with a completely new session
+
+## 0.5.0
+
+This version is a complete rework of omemo_dart!
+
+- Removed events from `OmemoManager`
+- Removed `OmemoSessionManager`
+- Removed serialization/deserialization code
+- Replace exceptions with errors inside a result type
+- Ratchets and trust data is now loaded and cached on demand
+- Accessing the trust manager must happen via `withTrustManager`

lib/src/errors.dart

@@ -34,3 +34,6 @@ class MalformedCiphertextError extends OmemoError {
   /// The exception that was raised while decryption.
   final Object ex;
 }
+
+/// Caused by an empty <key /> element
+class MalformedEncryptedKeyError extends OmemoError {}

lib/src/omemo/omemo.dart

@@ -356,6 +356,14 @@ class OmemoManager {
       );
     }
 
+    // Protobuf will happily parse this and return bogus data.
+    if (key.value.isEmpty) {
+      return DecryptionResult(
+        null,
+        MalformedEncryptedKeyError(),
+      );
+    }
+
     // Check how we should process the message
     final ratchetKey =
         RatchetMapKey(stanza.bareSenderJid, stanza.senderDeviceId);
@@ -433,7 +441,9 @@ class OmemoManager {
         return DecryptionResult(null, error);
       }
 
-      final result = await _decryptAndVerifyHmac(
+      Result<OmemoError, String?> result;
+      if (stanza.payload != null) {
+        result = await _decryptAndVerifyHmac(
           stanza.payload?.fromBase64(),
           keyAndHmac.get<List<int>>(),
         );
@@ -446,6 +456,9 @@ class OmemoManager {
             error,
           );
         }
+      } else {
+        result = const Result(null);
+      }
 
       // Notify the trust manager
       await _trustManager.onNewSession(
@@ -530,7 +543,9 @@ class OmemoManager {
         return DecryptionResult(null, error);
       }
 
-      final result = await _decryptAndVerifyHmac(
+      Result<OmemoError, String?> result;
+      if (stanza.payload != null) {
+        result = await _decryptAndVerifyHmac(
           stanza.payload?.fromBase64(),
           keyAndHmac.get<List<int>>(),
         );
@@ -542,6 +557,9 @@ class OmemoManager {
             error,
           );
         }
+      } else {
+        result = const Result(null);
+      }
 
       // If we received an empty OMEMO message, mark the ratchet as acknowledged
       if (result.get<String?>() == null) {
@@ -587,7 +605,7 @@ class OmemoManager {
 
     // Encrypt the payload, if we have any
     final List<int> payloadKey;
-    final List<int> ciphertext;
+    final List<int>? ciphertext;
     if (stanza.payload != null) {
       // Generate the key and encrypt the plaintext
       final rawKey = generateRandomBytes(32);
@@ -601,7 +619,7 @@ class OmemoManager {
       payloadKey = concat([rawKey, hmac]);
     } else {
       payloadKey = List<int>.filled(32, 0x0);
-      ciphertext = [];
+      ciphertext = null;
     }
 
     final encryptionErrors = <String, List<EncryptToJidError>>{};
@@ -942,7 +960,9 @@ class OmemoManager {
 
   /// Trust management functions
   Future<void> withTrustManager(
-      String jid, Future<void> Function(TrustManager) callback) async {
+    String jid,
+    Future<void> Function(TrustManager) callback,
+  ) async {
     await _ratchetQueue.synchronized(
       [jid],
       () => callback(_trustManager),

pubspec.yaml

@@ -1,6 +1,6 @@
 name: omemo_dart
 description: An XMPP library independent OMEMO library
-version: 0.4.3
+version: 0.5.0
 homepage: https://github.com/PapaTutuWawa/omemo_dart
 publish_to: https://git.polynom.me/api/packages/PapaTutuWawa/pub