The XySSL libraries (XySSL.lib and XySSLD.lib) are built with parameters that are suitable for most applications. Should application-specific tuning be required, this may be accomplished by modifying the config.h file, and recompiling the library.
A Code Composer Studio project, and all source code required, is provided with every MDK release. Find and open the XySSL.prj file in the "$(MityDSP_2_1)\lib\xyssl" directory (for MDK 2.1), modify the config.h file as required, and rebuild the debug and release versions of the library.
Documentation on all available tuning parameters can be found in the config.h file itself, or within the XySSL documentation at http://xyssl.org/.