-void writeFile( std::string name, std::string content );
-std::string readFile( std::string name );
+void writeFile( const std::string& name, const std::string& content );
+std::string readFile( const std::string& name );
+
+std::string writeBackFile( const std::string& serial, const std::string& cert, const std::string& keydir );
+
+std::pair<bool, std::time_t> parseDate( const std::string& date );
+std::pair<bool, std::time_t> parseMonthInterval( std::time_t t, const std::string& date );
+std::pair<bool, std::time_t> parseYearInterval( std::time_t t, const std::string& date );