keyfork-derive-util: make private and public test keys more visible

crates/derive/keyfork-derive-util/src/private_key.rs

@@ -180,6 +180,8 @@ impl PrivateKey for ed25519_dalek::SigningKey {
 
 use crate::public_key::TestPublicKey;
 
+/// A private key that can be used for testing purposes. Does not utilize any significant
+/// cryptographic operations.
 #[derive(Clone, Debug, PartialEq, Eq)]
 pub struct TestPrivateKey {
     key: [u8; 32],

crates/derive/keyfork-derive-util/src/public_key.rs

@@ -142,13 +142,15 @@ impl PublicKey for VerifyingKey {
     }
 }
 
+/// A public key that can be used for testing purposes. Does not utilize any significant
+/// cryptographic operations.
 #[derive(Clone)]
 pub struct TestPublicKey {
     pub(crate) key: [u8; 33],
 }
 
 impl TestPublicKey {
-    #[doc(hidden)]
+    /// Create a new TestPublicKey from the given bytes.
     #[allow(dead_code)]
     pub fn from_bytes(b: &[u8]) -> Self {
         Self {