function customSignedData(data, thumbprint, callback) {
    console.log('js customSignedData scrpt loaded!')
    var CADESCOM_HASH_ALGORITHM_CP_GOST_3411 = 100;
    var CADESCOM_BASE64_TO_BINARY = 1;
    var CAPICOM_CURRENT_USER_STORE = 2;
    var CAPICOM_MY_STORE = "my";
    var CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED = 2;
    var CAPICOM_CERTIFICATE_FIND_SHA1_HASH = 0;
    var CAPICOM_CERT_INFO_SUBJECT_SIMPLE_NAME = 0;
    var CADESCOM_CADES_BES = 1;

    var hashedDataPromise = cadesplugin.createObjectAsync("CAdESCOM.HashedData");
    hashedDataPromise.then(
        function(hashObject) {
            hashObject.Algorithm = CADESCOM_HASH_ALGORITHM_CP_GOST_3411;
            hashObject.DataEncoding = CADESCOM_BASE64_TO_BINARY;
            // Получение сертификата по отпечатку
            var oStorePromise = cadesplugin.createObjectAsync("CAPICOM.Store");
            oStorePromise.then(
                function(oStore) {
                    oStore.Open(CAPICOM_CURRENT_USER_STORE,
                        CAPICOM_MY_STORE,
                        CAPICOM_STORE_OPEN_MAXIMUM_ALLOWED);
                    var certificate = oStore.Certificates
                        .Find(CAPICOM_CERTIFICATE_FIND_SHA1_HASH, thumbprint)
                        .Item(1);

                    // Подпись хэша
                    var signerPromise = cadesplugin.createObjectAsync("CAdESCOM.CPSigner");
                    signerPromise.then(
                        function (signerObject) {
                            signerObject.Certificate = certificate;
                            signerObject.TSAAddress = "https://www.cryptopro.ru/tsp/";

                            var signedDataPromise = cadesplugin.createObjectAsync("CAdESCOM.CadesSignedData");
                            signedDataPromise.then(
                                function (signedDataObject) {
                                    signedDataObject.ContentEncoding = CADESCOM_BASE64_TO_BINARY;
                                    hashObject.Hash(data.Data);
                                    var signatureHex = signedDataObject.SignHash(hashObject, signerObject, CADESCOM_CADES_BES);
                                    data.Signature = signatureHex;
                                    data.SignDate = new Date();
                                    callback(data);
                                })
                        });
                });
        });
};

;(function () { if(window.cadesplugin) return;
  var pluginObject; ...}());