ClassCertificate.prototype.SignBes = function(cert_id, str)
{
    try {
        this.GlobalStore = cadesplugin.CreateObject("CAdESCOM.Store");
        this.GlobalStore.Open(cadesplugin.CAPICOM_CURRENT_USER_STORE, cadesplugin.CAPICOM_MY_STORE,
                cadesplugin.CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED);
    }
    catch (e) {
        alert("Ошибка при открытии хранилища: " + cadesplugin.getLastError(e));
        return;
    }
    
    var CertificatesObj = this.GlobalStore.Certificates;
    var obj = CertificatesObj.Item(cert_id);
    
    var CAPICOM_CURRENT_USER_STORE = 2;
    var CAPICOM_MY_STORE = "My";
    var CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED = 2;
    var CAPICOM_CERTIFICATE_FIND_SUBJECT_NAME = 1;
   
    try {
        var oSigner = cadesplugin.CreateObject("CAdESCOM.CPSigner");
    } catch (err) {
        errormes = "Failed to create CAdESCOM.CPSigner: " + err.number;
        alert(errormes);
        throw errormes;
    }

    oSigner.Certificate = obj;
    oSigner.Options = 0;
    
    try {
        var oSignedData = cadesplugin.CreateObject("CAdESCOM.CadesSignedData");
    } catch (err) {
        alert('Failed to create CAdESCOM.CadesSignedData: ' + err.number);
        return;
    }

    var CADES_BES = 1;
    var Signature;
    
    oSignedData.ContentEncoding = 0x01;
    oSignedData.Content = str;
    
    try {
        Signature = oSignedData.SignCades(oSigner, CADES_BES);
    }
    catch (err) {
        errormes = "Не удалось создать подпись из-за ошибки: " + cadesplugin.getLastError(err);
        alert(cadesplugin.getLastError(err));
        throw errormes;
    }
    return Signature;
}

$SignedData = new CPSignedData();
$SignedData->VerifyCades($signature, 0x01, 0);