>Change Set:		DES
>Date:			26 January 2000
>Author:			Duane Maxwell
>
>This class implements the Data Encryption Standard (DES) block cipher per
>ANSI X3.92.  It requires the presence of the 'DESPlugin'.  At some future
>date the functionality of the plugin may be provided in pure Smalltalk, but
>the slowness would be prohibitive for anything other than trivial usage.
>The main barrier to translation is the heavy use of zero-based indexing of
>arrays.
>
>How to use: you first provide an 8-byte key which will be used to encode
>and decode the data. Internally, this is 'cooked' into a 32-word format to
>speed up the encryption process.  The data is then sent in 8-byte packets
>to be encoded or decoded.  You must externally account for padding.  See
>the 'testing' category on the class side for examples.
>
>As of this date (1/26/2000), the U.S. Government has lifted many of the
>previous restrictions on the export of encryption software, but you should
>check before exporting anything including this code.
>
>Macintosh plugin included.

Duane, this is outstanding stuff!!!  I am presently working on some 
OpenPGP protocol routines, and this code will fill in the meat quite 
nicely.