Find file History
Martin Sebor
Martin Sebor Fix build failures with -DDEBUG.
        [BZ #19443]
        * crypt/crypt_util.c [DEBUG] (_ufc_prbits): Correct format string.
        [DEBUG] (_ufc_set_bits): Declare used.
        * iconv/gconv_dl.c [DEBUG]: Add a missing include directive.
        [DEBUG] (print_all): Declare used.
        * resolv/res_send.c [DEBUG] (__libc_res_nsend): Explicitly convert
        operands of the ternary ?: expression to target type.
        * stdlib/rshift.c [DEBUG] (mpn_rshift): Use assert() instead of
        calling the undeclared abort.
        * time/mktime.c [DEBUG] (DEBUG): Rename to DEBUG_MKTIME.
Latest commit f2b3078 Jan 15, 2016
Permalink
Type Name Latest commit message Commit time
..
Failed to load latest commit information.
Banner * Makeconfig (all-subdirs): Add 'crypt' subdirectory. * sysdeps/unix/… Feb 29, 2000
Makefile Update copyright dates with scripts/update-copyrights. Jan 4, 2016
README.ufc-crypt * Makeconfig (all-subdirs): Add 'crypt' subdirectory. * sysdeps/unix/… Feb 29, 2000
Versions * Makeconfig (rpath-dirs): Add crypt. Mar 4, 2000
badsalttest.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
cert.c Convert 24 more function definitions to prototype style (array parame… Oct 20, 2015
cert.input * Makeconfig (all-subdirs): Add 'crypt' subdirectory. * sysdeps/unix/… Feb 29, 2000
crypt-entry.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
crypt-private.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
crypt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
crypt.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
crypt_util.c Fix build failures with -DDEBUG. Jan 15, 2016
md5-block.c Add support for sparc cryptographic hash opcodes. Nov 14, 2012
md5-crypt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
md5.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
md5.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
md5c-test.c * crypt/crypt-entry.c: Include fips-private.h. Oct 10, 2012
md5test-giant.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
md5test.c Update. Dec 28, 2001
sha256-block.c Add #include <stdint.h> for uint[32|64]_t usage (except installed hea… May 16, 2013
sha256-crypt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha256.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha256.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha256c-test.c [BZ #5204] Oct 28, 2007
sha256test.c * crypt/sha256test.c (main): Perform 100,000 'a' test in a second way. Mar 15, 2009
sha512-block.c Add #include <stdint.h> for uint[32|64]_t usage (except installed hea… May 16, 2013
sha512-crypt.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha512.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha512.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
sha512c-test.c Bump sha512c-test.c timeout for the sake of 32-bit sparc. May 17, 2012
sha512test.c * crypt/Makefile (libcrypt-routines): Add sha256-crypt, sha256, Sep 19, 2007
speeds.c Fix typos. Aug 21, 2013
ufc-crypt.h Update copyright dates with scripts/update-copyrights. Jan 4, 2016
ufc.c Update copyright dates with scripts/update-copyrights. Jan 4, 2016

README.ufc-crypt

The following is the README for UFC-crypt, with those portions deleted
that are known to be incorrect for the implementation used with the
GNU C library.


	UFC-crypt: ultra fast 'crypt' implementation
	============================================

	@(#)README	2.27 11 Sep 1996

Design goals/non goals:
----------------------

- Crypt implementation plugin compatible with crypt(3)/fcrypt.

- High performance when used for password cracking.

- Portable to most 32/64 bit machines.

- Startup time/mixed salt performance not critical.

Features of the implementation:
------------------------------

- On most machines, UFC-crypt runs 30-60 times faster than crypt(3) when
  invoked repeated times with the same salt and varying passwords.

- With mostly constant salts, performance is about two to three times
  that of the default fcrypt implementation shipped with Alec
  Muffets 'Crack' password cracker. For instructions on how to
  plug UFC-crypt into 'Crack', see below.

- With alternating salts, performance is only about twice
  that of crypt(3).

- Requires 165 kb for tables.

Author & licensing etc
----------------------

UFC-crypt is created by Michael Glad, email: glad@daimi.aau.dk, and has
been donated to the Free Software Foundation, Inc. It is covered by the
GNU library license version 2, see the file 'COPYING.LIB'.

NOTES FOR USERS OUTSIDE THE US:
------------------------------

The US government limits the export of DES based software/hardware.
This software is written in Aarhus, Denmark. It can therefore be retrieved
from ftp sites outside the US without breaking US law. Please do not
ftp it from american sites.

Benchmark table:
---------------

The table shows how many operations per second UFC-crypt can
do on various machines.

|--------------|-------------------------------------------|
|Machine       |  SUN*  SUN*   HP*     DecStation   HP     |
|              | 3/50   ELC  9000/425e    3100    9000/720 |
|--------------|-------------------------------------------|
| Crypt(3)/sec |  4.6    30     15         25        57    |
| Ufc/sec      |  220   990    780       1015      3500    |
|--------------|-------------------------------------------|
| Speedup      |   48    30     52         40        60    |
|--------------|-------------------------------------------|

*) Compiled using special assembly language support module.

It seems as if performance is limited by CPU bus and data cache capacity.
This also makes the benchmarks debatable compared to a real test with
UFC-crypt wired into Crack. However, the table gives an outline of
what can be expected.

Optimizations:
-------------

Here are the optimizations used relative to an ordinary implementation
such as the one said to be used in crypt(3).

Major optimizations
*******************

- Keep data packed as bits in integer variables -- allows for
  fast permutations & parallel xor's in CPU hardware.

- Let adjacent final & initial permutations collapse.

- Keep working data in 'E expanded' format all the time.

- Implement DES 'f' function mostly by table lookup

- Calculate the above function on 12 bit basis rather than 6
  as would be the most natural.

- Implement setup routines so that performance is limited by the DES
  inner loops only.

- Instead of doing salting in the DES inner loops, modify the above tables
  each time a new salt is seen. According to the BSD crypt code this is
  ugly :-)

Minor (dirty) optimizations
***************************

- combine iterations of DES inner loop so that DES only loops
  8 times. This saves a lot of variable swapping.

- Implement key access by a walking pointer rather than coding
  as array indexing.

- As described, the table based f function uses a 3 dimensional array:

	sb ['number of 12 bit segment']['12 bit index']['48 bit half index']

  Code the routine with 4 (one dimensional) vectors.

- Design the internal data format & uglify the DES loops so that
  the compiler does not need to do bit shifts when indexing vectors.

Revision history
****************

UFC patchlevel 0: base version; released to alt.sources on Sep 24 1991
UFC patchlevel 1: patch released to alt.sources on Sep 27 1991.
		  No longer rebuilds sb tables when seeing a new salt.
UFC-crypt pl0:	  Essentially UFC pl 1. Released to comp.sources.misc
		  on Oct 22 1991.
UFC-crypt pl1:    Released to comp.sources.misc in march 1992
		  * setkey/encrypt routines added
		  * added validation/benchmarking programs
		  * reworked keyschedule setup code
		  * memory demands reduced
		  * 64 bit support added