Add from_json_bytes method to KeyMeta

src/jose.rs

@@ -496,6 +496,12 @@ impl KeyMeta {
         serde_json::from_str(val).map_err(Into::into)
     }
 
+    /// Deserialize this data from a JSON blob (this does the same as [`from_json`] but does not
+    /// require a UTF-8 `&str`).
+    pub fn from_json_bytes(val: &[u8]) -> Result<Self> {
+        serde_json::from_slice(val).map_err(Into::into)
+    }
+
     /// Create a [`TangClient`] from the URL used to generate this key
     pub fn client(&self, timeout: Option<Duration>) -> TangClient {
         TangClient::new(&self.clevis.tang.url, timeout)

tests/backend.rs

@@ -35,4 +35,7 @@ fn test_roundtrip() {
     let newkey = client.recover_secure_key::<10>(&new_meta).unwrap();
 
     assert_eq!(encryption_key.as_bytes(), newkey.as_bytes());
+
+    // sanity check the bytes implementation
+    let new_meta = KeyMeta::from_json_bytes(&meta_str.as_bytes()).unwrap();
 }