Help Guide (Web manual)

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HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

The licence and distribution terms for any publically available version or derivative of this code cannot be

changed.

i.e. this code cannot simply be copied and put under another distribution licence [including the GNU Public

Licence.]

trsha1.c

$KAME: sha1.c,v 1.5 2000/11/08 06:13:08 itojun Exp $

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the

following conditions are met:

THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS “AS IS” AND ANY EXPRESS OR IMPLIED

WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND

FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.

IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,

SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF

SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)

HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR

TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

FIPS pub 180-1: Secure Hash Algorithm (SHA-1) based on:

http://csrc.nist.gov/fips/fip180-1.txt implemented by

Jun-ichiro itojun Itoh <itojun@itojun.org>

sha1.c : Implementation of the Secure Hash Algorithm

SHA: NIST's Secure Hash Algorithm

This version written November 2000 by David Ireland of DI Management Services Pty Limited <code@di-

mgt.com.au>

Adapted from code in the Python Cryptography Toolkit, version 1.0.0 by A.M. Kuchling 1995.

AM Kuchling's posting:-

Based on SHA code originally posted to sci.crypt by Peter Gutmann in message

<30ajo5$oe8@ccu2.auckland.ac.nz>.

The original specification of SHA was found to have a weakness by NSA/NIST.

This code implements the fixed version of SHA.

Here's the first paragraph of Peter Gutmann's posting:

The following is my SHA (FIPS 180) code updated to allow use of the “fixed” SHA, thanks to Jim Gillogly and an

anonymous contributor for the information on what's changed in the new version.

The fix is a simple change which involves adding a single rotate in the initial expansion function.

It is unknown whether this is an optimal solution to the problem which was discovered in the SHA or whether

it's simply a bandaid which fixes the problem with a minimum of effort (for example the reengineering of a great

many Capstone chips).

trsha2.c

$KAME: sha1.c,v 1.5 2000/11/08 06:13:08 itojun Exp $

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the

following conditions are met:

Redistributions of source code must retain the above copyright notice, this list of conditions and the following

disclaimer.

Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the

following disclaimer in the documentation and/or other materials provided with the distribution.

Neither the name of the project nor the names of its contributors may be used to endorse or promote

products derived from this software without specific prior written permission.