let oCertificate;
    let oSigner;
    let oSignedData;
    let sSignedMessage;

    let oStore = cadesplugin.CreateObject("CAPICOM.Store");
    oStore.Open(CAPICOM_CURRENT_USER_STORE, CAPICOM_MY_STORE, CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED);

    let oCertificates = oStore.Certificates.Find(CAPICOM_CERTIFICATE_FIND_SHA1_HASH, thumbprint);

    if (oCertificates.Count == 0) {
        return "Certificate not found: " + thumbprint;
    }

    oCertificate = oCertificates.Item(1);
    oSigner = cadesplugin.CreateObject("CAdESCOM.CPSigner");
    oSigner.Certificate = oCertificate;
    oSigner.TSAAddress = "http://testca.cryptopro.ru/tsp/";

    oSignedData = cadesplugin.CreateObject("CAdESCOM.CadesSignedData");
    oSignedData.ContentEncoding = CADESCOM_BASE64_TO_BINARY;
    oSignedData.Content = dataToSign;

    try {
        sSignedMessage = oSignedData.SignCades(oSigner, CADESCOM_CADES_X_LONG_TYPE_1);
    } catch (err) {
        return "Failed to create signature. Error: " + GetErrorMessage(err);
    }

    try {
        oSignedData.VerifyCades(sSignedMessage, CADESCOM_CADES_X_LONG_TYPE_1);
    } catch (err) {
        alert("Failed to verify signature. Error: " + cadesplugin.getLastError(err));
        return false;
    }

    oStore.Close();
    return sSignedMessage;