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

/*
var oCertificates = oStore.Certificates.Find(
CAPICOM_CERTIFICATE_FIND_SUBJECT_NAME, certSubjectName);

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

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

var oSignedData = CreateObject("CAdESCOM.CadesSignedData");
oSignedData.Content = dataToSign;

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

oStore.Close();

return sSignedMessage;