1 files changed, 4 insertions, 3 deletions
diff --git a/openpgp/src/crypto/backend/cng.rs b/openpgp/src/crypto/backend/cng.rs
index 8bf01b02..15c418a2 100644
--- a/openpgp/src/crypto/backend/cng.rs
+++ b/openpgp/src/crypto/backend/cng.rs
@@ -46,9 +46,10 @@ impl AEADAlgorithm {
     pub(crate) fn is_supported_by_backend(&self) -> bool {
         use self::AEADAlgorithm::*;
         match &self {
-            EAX
-                => true,
-            OCB | Private(_) | Unknown(_)
+            EAX => true,
+            OCB => false,
+            GCM => false,
+            Private(_) | Unknown(_)
                 => false,
         }
     }