MD5 in Lua

[Jean-Claude Wippler <jcw@...>]

Here is a page which lists the performance of various implementations of the 
MD5 message digest algorithm, exercising integer math and bit operations:
    http://www.equi4.com/md5/index.html

If anyone sees a way to improve on the current Lua version, please feel free 
to send me a copy, preferably with a timing comparison with the current one, 
and I'll add the best result with source code and an acknowledgement.

-jcw