-/** Create a digest for a file.
- * @param filename File name.
- * @param progress If non-0, a signal which will be emitted periodically to update
- * progress; the parameter will start at 0.5 and proceed to 1.
- * @return Digest.
- */
-extern std::string make_digest (std::string filename, sigc::signal1<void, float>* progress);
+extern void init ();
+
+extern void sign (xmlpp::Element* parent, CertificateChain const & certificates, boost::filesystem::path signer_key, Standard standard);
+extern void add_signature_value (xmlpp::Element* parent, CertificateChain const & certificates, boost::filesystem::path signer_key, std::string const & ns);
+extern void add_signer (xmlpp::Element* parent, CertificateChain const & certificates, std::string const & ns);
+
+extern int base64_decode (std::string const & in, unsigned char* out, int out_length);
+extern boost::optional<boost::filesystem::path> relative_to_root (boost::filesystem::path root, boost::filesystem::path file);
+extern std::string tm_to_string (struct tm *);
+extern std::string utc_offset_to_string (int);
+extern std::string ptime_to_string (boost::posix_time::ptime);
+extern FILE * fopen_boost (boost::filesystem::path, std::string);