CPSigner signer = new CPSigner { Certificate = certificate, TSAAddress = "http://test.esphere.ru/tsp-test/" };
CadesSignedData signedData = new CadesSignedData
{
    ContentEncoding = CADESCOM_CONTENT_ENCODING_TYPE.CADESCOM_BASE64_TO_BINARY,
    Content = Convert.ToBase64String(File.ReadAllBytes(filePath))
};
string result = signedData.SignCades(signer, CADESCOM_CADES_TYPE.CADESCOM_CADES_X_LONG_TYPE_1, true);