diff --git a/ssh-key/src/private/sk.rs b/ssh-key/src/private/sk.rs
index 344e578..f96e805 100644
--- a/ssh-key/src/private/sk.rs
+++ b/ssh-key/src/private/sk.rs
@@ -107,6 +107,17 @@ pub struct SkEd25519 {
 }
 
 impl SkEd25519 {
+    /// Construct new instance of SkEd25519.
+    #[cfg(feature = "alloc")]
+    pub fn new(public: public::SkEd25519, flags: u8, key_handle: &[u8]) -> Self {
+        SkEd25519 {
+            public,
+            flags,
+            key_handle: key_handle.to_vec(),
+            reserved: Vec::<u8>::new(),
+        }
+    }
+
     /// Get the Ed25519 public key.
     pub fn public(&self) -> &public::SkEd25519 {
         &self.public