can_load_key method

Implementation

@override
Future<String?> can_load_key(String keyname) async{
  try{
    final signature = await methodChannel.invokeMethod<String>('can_load_key', {'keyname': keyname});
    return signature ?? 'Could not load key';
  } on PlatformException catch (ex){
    return ex.message ?? 'Unexpected error';
  }
}