MD5 - Cryptographic Library for Lua Copyright 2003 PUC-Rio http://www.keplerproject.org/md5
MD5 offers basic cryptographic facilities for Lua 5.1: a hash (digest) function, a pair crypt/decrypt based on MD5 and CFB, and a pair crypt/decrypt based on DES with 56-bit keys.
MD5 current version is 1.1.2.
This version is copy from https://github.com/keplerproject/md5