From d9129a4840284e93bf1f070e07e55d3e5fc4bea1 Mon Sep 17 00:00:00 2001
From: Tony Arcieri <bascule@gmail.com>
Date: Sat, 31 Jan 2026 08:57:39 -0700
Subject: [PATCH] x-wing: impl `KeyExport` for `DecapsulationKey`

---
 x-wing/src/lib.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/x-wing/src/lib.rs b/x-wing/src/lib.rs
index 98b2220..ccece62 100644
--- a/x-wing/src/lib.rs
+++ b/x-wing/src/lib.rs
@@ -242,13 +242,19 @@ impl KeySizeUser for DecapsulationKey {
 }
 
 impl KeyInit for DecapsulationKey {
-    fn new(key: &ArrayN<u8, 32>) -> Self {
+    fn new(key: &Key<Self>) -> Self {
         let (_sk_m, _sk_x, pk_m, pk_x) = expand_key(key.as_ref());
         let ek = EncapsulationKey { pk_m, pk_x };
         Self { sk: key.0, ek }
     }
 }
 
+impl KeyExport for DecapsulationKey {
+    fn to_bytes(&self) -> Key<Self> {
+        self.sk.into()
+    }
+}
+
 #[cfg(feature = "zeroize")]
 impl ZeroizeOnDrop for DecapsulationKey {}