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;
}