feat: add trait to convert slice into X25519PublicKey

src/lib.rs

@@ -23,6 +23,14 @@ pub struct X25519PubKey<'a>(SharedPtr<'a, 32>);
 #[derive(Debug)]
 pub struct X25519SharedKey<'a>(SharedPtr<'a, 32>);
 
+impl From<&[u8; 32]> for X25519PubKey<'_> {
+    fn from(value: &[u8; 32]) -> Self {
+        let mut pk = SharedPtr::<32>::new().unwrap();
+        pk.copy_from_slice(value);
+        X25519PubKey(pk)
+    }
+}
+
 pub fn x25519_keygen<'a>() -> (X25519PrivKey<'a>, X25519PubKey<'a>) {
     let sk = X25519PrivKey(SharedPtr::<8>::new().unwrap());
     let pk = X25519PubKey(SharedPtr::<32>::new().unwrap());