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大名鼎鼎的DES加密算法

Late breaking news:
	Versions of uuencode and uudecode now included, which are helpful
	for using this package to send/receive encrypted mail.

Phil asked me to clean this up slightly and package it for distribution.
I've got it running on my Symmetric 4.2bsd system, Phil reports it runs fine
on a variety of systems at Bellcore.  Note that getopt is required but not
provided, as there is already a getopt package in the mod.sources archives.

Bdale Garbee, N3EUA  870401	
winfree!bdale aka [e-mail]

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This package contains a DES subroutine library based on the original public
domain code by James Gillogly, but made faster and more flexible. Commands
using this library have been added for testing and for encrypting and
decrypting files (compatible with the DES command under Sun UNIX), among
other things.

Run make. That will compile everything and run test data (from the NBS
certification suite) through it.  It runs as-is under UNIX. It will run
under MS-DOS with a few minor changes: make sure you define LITTLE_ENDIAN
when compiling des.c, and change the name of the console in getpass.c.  If
you have the byte order flag set wrong, you will get ENCRYPT FAIL messages
when the descert test is run.

radlogin.c is an experimental program for secure UNIX login via insecure
channels (like amateur packet radio). Make it and set it up as the login
shell for a special, password-free login (e.g., "radio"). When it starts the
user will be asked his REAL login name, which is then looked up in
/etc/rkeys. (This file must be read protected since it contains DES keys).
The time of day is then printed in hex as a challenge. The user must encrypt
it using DES and his key and type the answer back.  The user may use the
program "descalc" to perform his local calculation. All this is very clumsy;
it works, but after all it's only experimental.

Phil Karn, KA9Q
bellcore!karn aka [e-mail]

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Subject: Re:  rkeys file

rkeys:
karn 0123456789abcdef
uid  des_key_in_hex

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