function Sign(dataToSign) {
    var oCertificate = GetCertificateBySubjectName();
 
    var oSigner = CreateObject("CAdESCOM.CPSigner");
    oSigner.TSAAddress = "https://www.cryptopro.ru/tsp/";
    oSigner.Certificate = oCertificate;    
 
    var oHashedData = CreateObject("CAdESCOM.HashedData");
    oHashedData.Algorithm = CADESCOM_HASH_ALGORITHM_CP_GOST_3411;
    oHashedData.DataEncoding = CADESCOM_BASE64_TO_BINARY;  
    oHashedData.Hash(dataToSign); // dataToSign - это строка base64
 
    var oSignedData = CreateObject("CAdESCOM.CadesSignedData");
 
    var sSignedMessage = "";
    try {
        sSignedMessage = oSignedData.SignHash(oHashedData, oSigner, CADESCOM_CADES_BES);
    } catch (err) {
        return;
    }
 
    return sSignedMessage;   
}