...
    cadesplugin.async_spawn(function*(arg) {
      var oSigner;
      var oSignedData;
      var sSignedData = '';

      try {
        oSigner = yield cadesplugin.CreateObjectAsync("CAdESCOM.CPSigner");
      } catch (e) {
        return;
      }
      if (oSigner) {
        yield oSigner.propset_Certificate(params['certificate']);
      } else {
        return;
      }

      try {
        oSignedData = yield cadesplugin.CreateObjectAsync("CAdESCOM.CadesSignedData");

        yield oSigner.propset_Options(me.CAPICOM_CERTIFICATE_INCLUDE_OPTION.CAPICOM_CERTIFICATE_INCLUDE_END_ENTITY_ONLY); //CAPICOM_CERTIFICATE_INCLUDE_WHOLE_CHAIN
        yield oSignedData.propset_ContentEncoding(0x01);

        var oHashedData = yield cadesplugin.CreateObjectAsync("CAdESCOM.HashedData");
        yield oHashedData.propset_Algorithm(cadesplugin.CADESCOM_HASH_ALGORITHM_CP_GOST_3411_2012_512);
        yield oHashedData.propset_DataEncoding(cadesplugin.CADESCOM_BASE64_TO_BINARY);
        yield oHashedData.Hash(params['hash']);

        var CADES_BES = 1;
        try {
            sSignedData = yield oSignedData.SignHash(oHashedData, oSigner, CADES_BES);
        }
        catch (err) {
          failureCallback(err.message);
          return
        }


        if (!isEmpty(sSignedData)) {
          me.user_certificate = params['certificate'];
          successCallback(sSignedData);
          return true;
        }

        return false;
      } catch (e) {
        failureCallback(e.message);
      }
    }); //cadesplugin.async_spawn
..