Fix a bug with the CacheKey deserialization

It was only using 32 bits.

Author: pascalj

src/keys.rs

@@ -69,11 +69,11 @@ impl CacheKey {
     }
 
     /// Create a [CacheKey] from an existing ed25519 key.
-    pub fn with_signing_key(name: &str, signing_key: SigningKey) -> Self {
-        Self {
+    pub fn with_signing_key(name: &str, keypair_bytes: &[u8; 64]) -> anyhow::Result<Self> {
+        Ok(Self {
             name: name.into(),
-            signing_key,
-        }
+            signing_key: ed25519_dalek::SigningKey::from_keypair_bytes(keypair_bytes)?,
+        })
     }
 
     /// Return the key for signing NARs in the store.

src/server.rs

@@ -43,7 +43,7 @@ pub mod persistence {
         let cache_key = CacheKey::with_signing_key(
             &db_state.name,
             db_state.cache_key_bytes.as_slice().try_into()?,
-        );
+        )?;
         Ok(ServerState {
             paseto_key,
             cache_key,