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sec-tabselect.c
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Niels Möller authoredNiels Möller authored
sha256-compress.c 6.24 KiB
/* sha256-compress.c
The compression function of the sha256 hash function.
Copyright (C) 2001, 2010 Niels Möller
This file is part of GNU Nettle.
GNU Nettle is free software: you can redistribute it and/or
modify it under the terms of either:
* the GNU Lesser General Public License as published by the Free
Software Foundation; either version 3 of the License, or (at your
option) any later version.
or
* the GNU General Public License as published by the Free
Software Foundation; either version 2 of the License, or (at your
option) any later version.
or both in parallel, as here.
GNU Nettle is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received copies of the GNU General Public License and
the GNU Lesser General Public License along with this program. If
not, see http://www.gnu.org/licenses/.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#ifndef SHA256_DEBUG
# define SHA256_DEBUG 0
#endif
#if SHA256_DEBUG
# include <stdio.h>
# define DEBUG(i) \
fprintf(stderr, "%2d: %8x %8x %8x %8x %8x %8x %8x %8x\n", \
i, A, B, C, D ,E, F, G, H)
#else
# define DEBUG(i)
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "sha2.h"
#include "macros.h"
/* A block, treated as a sequence of 32-bit words. */
#define SHA256_DATA_LENGTH 16
/* The SHA256 functions. The Choice function is the same as the SHA1
function f1, and the majority function is the same as the SHA1 f3
function. They can be optimized to save one boolean operation each
- thanks to Rich Schroeppel, rcs@cs.arizona.edu for discovering
this */
/* #define Choice(x,y,z) ( ( (x) & (y) ) | ( ~(x) & (z) ) ) */
#define Choice(x,y,z) ( (z) ^ ( (x) & ( (y) ^ (z) ) ) )
/* #define Majority(x,y,z) ( ((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)) ) */