Introduction - If you have any usage issues, please Google them yourself
// des.cpp- modified by Wei Dai from:
/*
* This is a major rewrite of my old public domain DES code written
* circa 1987, which in turn borrowed heavily from Jim Gillogly s 1977
* public domain code. I pretty much kept my key scheduling code, but
* the actual encrypt/decrypt routines are taken from from Richard
* Outerbridge s DES code as printed in Schneier s "Applied Cryptography."
*
* This code is in the public domain. I would appreciate bug reports and
* enhancements.
*
* Phil Karn KA9Q, karn@unix.ka9q.ampr.org, August 1994.
*/