+extern void init ();
+
+extern void sign (xmlpp::Element* parent, CertificateChain const & certificates, std::string const & signer_key);
+extern void add_signature_value (xmlpp::Element* parent, CertificateChain const & certificates, std::string const & signer_key, std::string const & ns);
+extern void add_signer (xmlpp::Element* parent, CertificateChain const & certificates, std::string const & ns);
+