libmd5.c:
 - This code was written by Colin Plumb and is asserted to be in the Public
   Domain.  It was imported from md5deep, a program considered to be a work
   of the United States Government. Under 17 USC 105, works of the United
   States Government are not eligible for copyright protection.
 - Code imported from md5deep, common/md5.c 49 2008-03-05 02:31:38Z jessekornblum
 - removed PURE-C bug workaround
 - re-indented
 - removed commented out headers
 - removed common.h, replaced with stdint.h
 - deleted md5deep shim functions

libmd5.h:
 - declarations required to use libmd5.c

From: David Flynn <davidf@rd.bbc.co.uk>