fix

src/piv.rs

@@ -565,9 +565,12 @@ impl Key {
             };
 
             if !buf.is_empty() {
-                let cert = Certificate::from_bytes(buf)?;
-                keys.push(Key { slot, cert });
-            }
+	        match Certificate::from_bytes(buf) {
+		        Ok(cert) => keys.push(Key { slot, cert }),
+			Err(Error::InvalidObject) => {}        // skip slots we can't parse (e.g. Ed25519)
+			Err(other) => return Err(other),
+		}
+	    }
         }
 
         Ok(keys)