signNoAuth method

Implementation

Future<String> signNoAuth(String message) async {
  var isCorrectUuid =
      await _channel.invokeMethod('checkUuid', {'uuid': uuid});
  if (isCorrectUuid) {
    // if (Platform.isWindows) {
    //   var key =
    //       await _channel.invokeMethod('readData', {'key': "${uuid}_0_priv"});
    //   try {
    //     var signature = await NaclWin.signMessage(message, key);
    //     return signature;
    //   } on PlatformException {
    //     throw SigningFailureException('Signing the message has failed.');
    //   }
    // } else
    if (Platform.isIOS || Platform.isMacOS) {
      throw PlatformNotSupportedException(
          'MacOS and iOS are not supported when it comes to authentication-free signing.');
    } else {
      var signature = await _channel.invokeMethod(
          "signEd25519NoAuth", {'uuid': uuid, 'message': message});
      if (signature != false) {
        return signature;
      } else {
        throw SigningFailureException('Signing the message has failed.');
      }
    }
  } else {
    throw IncorrectUuidException(
        'There are no keys associated with this UUID saved on the device');
  }
}