This source is definitely a past thing--there's better solutions out there now, and everybody has moved to AES anyhow. I provide it because some of my libraries depend on it, and I'm too lazy to fix them.
The source file DESAlgorithm.java in this directory is a very nice port to Java by Frank O'Dwyer fod@brd.ie and Rainbow Diamond Limited of a DES implementation by Eric Young eay@mincom.oz.au. It's copyright all of these entities, but has been generously made available under an open source license with some restrictions. Please see the end of the file DESAlgorithm.java for details.
My "contribution" to all of this was to fix some minor bugs
(in weak-key testing and parity checking), maybe change the
interface slightly, remove some dead and broken code, and
provide some utility classes. The file
DESAlgorithm.java.patch contains compressed context diffs
from the original to what I did, in case you need to get the
original back. My code is licensed under terms described by
the file COPYING in this distribution.
DESBlock.java provides a more conventional OOP interface
to the algorithm.
DESStream.java encrypts and decrypts a Java Stream in a
format compatible with UNIX "des -b". (jdes.java provides
a command-line interface to this code as an example of how
to use it. I was actually pleasantly surprised by this
code's performance of around 8KB/sec interpreted on my UNIX
box!)
DESRandom.java generates pseudo-random numbers by
encrypting successive integers using DES. I have no idea
whether this is actually secure, but it seems to work pretty
well for my purposes.
TO DO:
- Have somebody re-implement DES from scratch in Java and place it in the public domain.
- Add CBC mode, 3DES, etc.
- Add other algorithms, and try to design a general purpose superclass for all of them. Replace DESStream and DESRandom with classes which take objects of this class in the constructor.
All my modifications are placed under the "MIT License", as
per the COPYING file with this distribution. Have fun!
Bart Massey
bart@cirl.uoregon.edu
12/1/97