Libdigidocpp library offers creating, signing and verification of digitally signed documents, according to <a href="http://www.etsi.org/deliver/etsi_ts/101900_101999/101903/01.04.02_60/ts_101903v010402p.pdf">XAdES</a> and <a href="http://www.w3.org/TR/xmldsig-core1/">XML-DSIG</a> standards.