md5 lib from:
http://sourceforge.net/projects/libmd5-rfc/

Various local modifications were made.

Source:
http://downloads.sourceforge.net/project/libmd5-rfc/libmd5-rfc/2002-04-13/md5.tar.gz

SHA 256 checksum:
81ea60e5694b61153a9ba1b8eac31cef90a922336e26a66000a55559163153f2

The project seems to be dead as of 2016.