async function connectAndSign(base64EncodedData) {
  const ncalayerClient = new NCALayerClient();
  try {
    await ncalayerClient.connect();
  } catch (error) {
    alert(`Не удалось подключиться к NCALayer: ${error.toString()}`);
    return;
  }
  let activeTokens;
  try {
    activeTokens = await ncalayerClient.getActiveTokens();
  } catch (error) {
    alert(error.toString());
    return;
  }
  const storageType = activeTokens[0] || NCALayerClient.fileStorageType;
  let base64EncodedSignature;
  try {
    base64EncodedSignature = await ncalayerClient.createCAdESFromBase64(storageType, base64EncodedData);
  } catch (error) {
    alert(error.toString());
    return;
  }
  return base64EncodedSignature;
}