From 5a1f76f164bf73c17200fa1b5c94a5e0aff26ce1 Mon Sep 17 00:00:00 2001
From: Nguyen Van Nguyen <nguyennv1981@gmail.com>
Date: Wed, 11 Dec 2024 10:03:59 +0700
Subject: [PATCH] WIP

Signed-off-by: Nguyen Van Nguyen <nguyennv1981@gmail.com>
---
 lib/src/message/literal_message.dart | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/lib/src/message/literal_message.dart b/lib/src/message/literal_message.dart
index 30d6c17b..28413a45 100644
--- a/lib/src/message/literal_message.dart
+++ b/lib/src/message/literal_message.dart
@@ -61,15 +61,20 @@ final class LiteralMessage extends BaseMessage
     final Iterable<KeyInterface> encryptionKeys, [
     final SymmetricAlgorithm defaultSymmetric = SymmetricAlgorithm.aes128,
   ]) {
-    var preferredSymmetrics = SymmetricAlgorithm.preferredSymmetrics;
-    for (final key in encryptionKeys) {
-      preferredSymmetrics = preferredSymmetrics
-          .where(
-            (symmetric) => key.preferredSymmetrics.contains(symmetric),
-          )
-          .toList();
+    final SymmetricAlgorithm symmetric;
+    if (encryptionKeys.isNotEmpty) {
+      var preferredSymmetrics = SymmetricAlgorithm.preferredSymmetrics;
+      for (final key in encryptionKeys) {
+        preferredSymmetrics = preferredSymmetrics
+            .where(
+              (symmetric) => key.preferredSymmetrics.contains(symmetric),
+            )
+            .toList();
+      }
+      symmetric = preferredSymmetrics.firstOrNull ?? defaultSymmetric;
+    } else {
+      symmetric = defaultSymmetric;
     }
-    final symmetric = preferredSymmetrics.firstOrNull ?? defaultSymmetric;
 
     var preferredAeads = [
       AeadAlgorithm.ocb,