Version 3.17 14/07/95
  Fixed ede3 cbc which I had broken in 3.16.  I have also
  removed some unneeded variables in 7-8 of the routines.

Version 3.16 26/06/95
  Added des_encrypt2() which does not use IP/FP, used by tripple
  des routines.  Tweaked things a bit elsewhere. %13 speedup on
  sparc and %6 on a R4400 for ede3 cbc mode.

Version 3.15 06/06/95
  Added des_ncbc_encrypt(), it is des_cbc mode except that it is
  'normal' and copies the new iv value back over the top of the
  passed parameter.
  CHANGED des_ede3_cbc_encrypt() so that it too now overwrites
  the iv.  THIS WILL BREAK EXISTING CODE, but since this function
  only new, I feel I can change it, not so with des_cbc_encrypt :-(.
  I need to update the documentation.

Version 3.14 31/05/95
  New release apon the world, as part of my SSL implementation.
  New copyright and usage stuff.  Basically free for all to use
  as long as you say it came from me :-)

Version 3.13 31/05/95
  A fix in speed.c, if HZ is not defined, I set it to 100.0
  which is reasonable for most unixes except SunOS 4.x.
  I now have a #ifdef sun but timing for SunOS 4.x looked very
  good :-(.  At my last job where I used SunOS 4.x, it was
  defined to be 60.0 (look at the old INSTALL documentation), at
  the last release had it changed to 100.0 since I now work with
  Solaris2 and SVR4 boxes.
  Thanks to  Rory Chisholm <rchishol@math.ethz.ch> for pointing this
  one out.

Version 3.12 08/05/95
  As pointed out by The Crypt Keeper <tck@bend.UCSD.EDU>,
  my D_ENCRYPT macro in crypt() had an un-necessary variable.
  It has been removed.

Version 3.11 03/05/95
  Added des_ede3_cbc_encrypt() which is cbc mode des with 3 keys
  and one iv.  It is a standard and I needed it for my SSL code.
  It makes more sense to use this for tripple DES than
  3cbc_encrypt().  I have also added (or should I say tested :-)
  cfb64_encrypt() which is cfb64 but it will ecnrypt a partial
  number of bytes - 3 bytes in 3 bytes out.  Again this is for
  my SSL library, as a form of encryption to use with SSL
  telnet.

Version 3.10 22/03/95
  Fixed a bug in 3cbc_encrypt() :-(.  When making repeated calls
  to cbc3_encrypt, the 2 iv values that were being returned to
  be used in the next call were reversed :-(.
  Many thanks to Bill Wade <wade@Stoner.COM> for pointing out
  this error.

Version 3.09 01/02/95
  Fixed des_random_key to far more random, it was rather feeble
  with reguards to picking the initial seed.  The problem was
  pointed out by Olaf Kirch <okir@monad.swb.de>.

Version 3.08 14/12/94
  Added Makefile.PL so libdes can be built into perl5.
  Changed des_locl.h so RAND is always defined.

Version 3.07 05/12/94
  Added GNUmake and stuff so the library can be build with
  glibc.

Version 3.06 30/08/94
  Added rpc_enc.c which contains _des_crypt.  This is for use in
  secure_rpc v 4.0
  Finally fixed the cfb_enc problems.
  Fixed a few parameter parsing bugs in des (-3 and -b), thanks
  to Rob McMillan <R.McMillan@its.gu.edu.au>

Version 3.05 21/04/94
  for unsigned long l; gcc does not produce ((l>>34) == 0)
  This causes bugs in cfb_enc.
  Thanks to Hadmut Danisch <danisch@ira.uka.de>

Version 3.04 20/04/94
  Added a version number to des.c and libdes.a

Version 3.03 12/01/94
  Fixed a bug in non zero iv in 3cbc_enc.

Version 3.02 29/10/93
  I now work in a place where there are 6+ archtectures and 14+
  OS versions :-).
  Fixed TERMIO definition so the most sys V boxes will work :-)

Release apon comp.sources.misc
Version 3.01 08/10/93
  Added des_3cbc_encrypt()

Version 3.00 07/10/93
  Fixed up documentation.
  quad_cksum definitly compatable with MIT's now.

Version 2.30 24/08/93
  Tripple DES now defaults to tripple cbc but can do tripple ecb
   with the -b flag.
  Fixed some MSDOS uuen/uudecoding problems, thanks to
  Added prototypes.
  
Version 2.22 29/06/93
  Fixed a bug in des_is_weak_key() which stopped it working :-(
  thanks to engineering@MorningStar.Com.

Version 2.21 03/06/93
  des(1) with no arguments gives quite a bit of help.
  Added -c (generate ckecksum) flag to des(1).
  Added -3 (tripple DES) flag to des(1).
  Added cfb and ofb routines to the library.

Version 2.20 11/03/93
  Added -u (uuencode) flag to des(1).
  I have been playing with byte order in quad_cksum to make it
   compatible with MIT's version.  All I can say is aviod this
   function if possible since MIT's output is endian dependent.

Version 2.12 14/10/92
  Added MSDOS specific macro in ecb_encrypt which gives a %70
   speed up when the code is compiled with turbo C.

Version 2.11 12/10/92
  Speedup in set_key (recoding of PC-1)
   I now do it in 47 simple operations, down from 60.
   Thanks to John Fletcher (john_fletcher@lccmail.ocf.llnl.gov)
   for motivating me to look for a faster system :-)
   The speedup is probably less that 1% but it is still 13
   instructions less :-).

Version 2.10 06/10/92
  The code now works on the 64bit ETA10 and CRAY without modifications or
   #defines.  I believe the code should work on any machine that
   defines long, int or short to be 8 bytes long.
  Thanks to Shabbir J. Safdar (shabby@mentor.cc.purdue.edu)
   for helping me fix the code to run on 64bit machines (he had
   access to an ETA10).
  Thanks also to John Fletcher <john_fletcher@lccmail.ocf.llnl.gov>
   for testing the routines on a CRAY.
  read_password.c has been renamed to read_passwd.c
  string_to_key.c has been renamed to string2key.c

Version 2.00 14/09/92
  Made mods so that the library should work on 64bit CPU's.
  Removed all my uchar and ulong defs.  To many different
   versions of unix define them in their header files in too many
   different combinations :-)
  IRIX - Sillicon Graphics mods (mostly in read_password.c).
   Thanks to Andrew Daviel (advax@erich.triumf.ca)

Version 1.99 26/08/92
  Fixed a bug or 2 in enc_read.c
  Fixed a bug in enc_write.c
  Fixed a pseudo bug in fcrypt.c (very obscure).

Version 1.98 31/07/92
  Support for the ETA10.  This is a strange machine that defines
  longs and ints as 8 bytes and shorts as 4 bytes.
  Since I do evil things with long * that assume that they are 4
  bytes.  Look in the Makefile for the option to compile for
  this machine.  quad_cksum appears to have problems but I
  will don't have the time to fix it right now, and this is not
  a function that uses DES and so will not effect the main uses
  of the library.

Version 1.97 20/05/92 eay
  Fixed the Imakefile and made some changes to des.h to fix some
  problems when building this package with Kerberos v 4.

Version 1.96 18/05/92 eay
  Fixed a small bug in string_to_key() where problems could
  occur if des_check_key was set to true and the string
  generated a weak key.

Patch2 posted to comp.sources.misc
Version 1.95 13/05/92 eay
  Added an alternative version of the D_ENCRYPT macro in
  ecb_encrypt and fcrypt.  Depending on the compiler, one version or the
  other will be faster.  This was inspired by 
  Dana How <how@isl.stanford.edu>, and her pointers about doing the
  *(ulong *)((uchar *)ptr+(value&0xfc))
  vs
  ptr[value&0x3f]
  to stop the C compiler doing a <<2 to convert the long array index.

Version 1.94 05/05/92 eay
  Fixed an incompatibility between my string_to_key and the MIT
   version.  When the key is longer than 8 chars, I was wrapping
   with a different method.  To use the old version, define
   OLD_STR_TO_KEY in the makefile.  Thanks to
   viktor@newsu.shearson.com (Viktor Dukhovni).

Version 1.93 28/04/92 eay
  Fixed the VMS mods so that echo is now turned off in
   read_password.  Thanks again to brennan@coco.cchs.su.oz.AU.
  MSDOS support added.  The routines can be compiled with
   Turbo C (v2.0) and MSC (v5.1).  Make sure MSDOS is defined.

Patch1 posted to comp.sources.misc
Version 1.92 13/04/92 eay
  Changed D_ENCRYPT so that the rotation of R occurs outside of
   the loop.  This required rotating all the longs in sp.h (now
   called spr.h). Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
  speed.c has been changed so it will work without SIGALRM.  If
   times(3) is not present it will try to use ftime() instead.

Version 1.91 08/04/92 eay
  Added -E/-D options to des(1) so it can use string_to_key.
  Added SVR4 mods suggested by witr@rwwa.COM
  Added VMS mods suggested by brennan@coco.cchs.su.oz.AU.  If
  anyone knows how to turn of tty echo in VMS please tell me or
  implement it yourself :-).
  Changed FILE *IN/*OUT to *DES_IN/*DES_OUT since it appears VMS
  does not like IN/OUT being used.

Libdes posted to comp.sources.misc
Version 1.9 24/03/92 eay
  Now contains a fast small crypt replacement.
  Added des(1) command.
  Added des_rw_mode so people can use cbc encryption with
  enc_read and enc_write.

Version 1.8 15/10/91 eay
  Bug in cbc_cksum.
  Many thanks to Keith Reynolds (keithr@sco.COM) for pointing this
  one out.

Version 1.7 24/09/91 eay
  Fixed set_key :-)
  set_key is 4 times faster and takes less space.
  There are a few minor changes that could be made.

Version 1.6 19/09/1991 eay
  Finally go IP and FP finished.
  Now I need to fix set_key.
  This version is quite a bit faster that 1.51

Version 1.52 15/06/1991 eay
  20% speedup in ecb_encrypt by changing the E bit selection
  to use 2 32bit words.  This also required modification of the
  sp table.  There is still a way to speedup the IP and IP-1
  (hints from outer@sq.com) still working on this one :-(.

Version 1.51 07/06/1991 eay
  Faster des_encrypt by loop unrolling
  Fixed bug in quad_cksum.c (thanks to hughes@logos.ucs.indiana.edu)

Version 1.50 28/05/1991 eay
  Optimized the code a bit more for the sparc.  I have improved the
  speed of the inner des_encrypt by speeding up the initial and
  final permutations.

Version 1.40 23/10/1990 eay
  Fixed des_random_key, it did not produce a random key :-(

Version 1.30  2/10/1990 eay
  Have made des_quad_cksum the same as MIT's, the full package
  should be compatible with MIT's
  Have tested on a DECstation 3100
  Still need to fix des_set_key (make it faster).
  Does des_cbc_encrypts at 70.5k/sec on a 3100.

Version 1.20 18/09/1990 eay
  Fixed byte order dependencies.
  Fixed (I hope) all the word alignment problems.
  Speedup in des_ecb_encrypt.

Version 1.10 11/09/1990 eay
  Added des_enc_read and des_enc_write.
  Still need to fix des_quad_cksum.
  Still need to document des_enc_read and des_enc_write.

Version 1.00 27/08/1990 eay