Hi Anatoly,
the page you are referring to is related to the features of security products of third party companies, not the features of the crypto libraries provided by SAP. If you want to do front-end signatures with smart cards, you need such a product. However at the moment I can not find any partner which is certified for the SSF interface and supporting what you want. Maybe if you describe the use case, there is an other solution, that can be used instead?
Regards,
Patrick