mirror of git://git.gnupg.org/gnupg.git
359 lines
9.5 KiB
C
359 lines
9.5 KiB
C
/* sha1.c - SHA1 hash function
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* Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc.
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*
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* Please see below for more legal information!
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*
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* This file is part of GnuPG.
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*
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* GnuPG is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* GnuPG is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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/* Test vectors:
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*
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* "abc"
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* A999 3E36 4706 816A BA3E 2571 7850 C26C 9CD0 D89D
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*
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* "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq"
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* 8498 3E44 1C3B D26E BAAE 4AA1 F951 29E5 E546 70F1
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <assert.h>
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#include "util.h"
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#include "memory.h"
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#include "algorithms.h"
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#include "bithelp.h"
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typedef struct {
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u32 h0,h1,h2,h3,h4;
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u32 nblocks;
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byte buf[64];
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int count;
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} SHA1_CONTEXT;
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static void
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burn_stack (int bytes)
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{
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char buf[128];
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wipememory(buf,sizeof buf);
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bytes -= sizeof buf;
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if (bytes > 0)
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burn_stack (bytes);
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}
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void
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sha1_init( SHA1_CONTEXT *hd )
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{
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hd->h0 = 0x67452301;
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hd->h1 = 0xefcdab89;
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hd->h2 = 0x98badcfe;
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hd->h3 = 0x10325476;
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hd->h4 = 0xc3d2e1f0;
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hd->nblocks = 0;
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hd->count = 0;
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}
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/****************
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* Transform the message X which consists of 16 32-bit-words
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*/
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static void
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transform( SHA1_CONTEXT *hd, byte *data )
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{
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u32 a,b,c,d,e,tm;
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u32 x[16];
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/* get values from the chaining vars */
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a = hd->h0;
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b = hd->h1;
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c = hd->h2;
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d = hd->h3;
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e = hd->h4;
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#ifdef BIG_ENDIAN_HOST
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memcpy( x, data, 64 );
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#else
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{ int i;
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byte *p2;
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for(i=0, p2=(byte*)x; i < 16; i++, p2 += 4 ) {
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p2[3] = *data++;
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p2[2] = *data++;
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p2[1] = *data++;
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p2[0] = *data++;
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}
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}
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#endif
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#define K1 0x5A827999L
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#define K2 0x6ED9EBA1L
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#define K3 0x8F1BBCDCL
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#define K4 0xCA62C1D6L
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#define F1(x,y,z) ( z ^ ( x & ( y ^ z ) ) )
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#define F2(x,y,z) ( x ^ y ^ z )
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#define F3(x,y,z) ( ( x & y ) | ( z & ( x | y ) ) )
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#define F4(x,y,z) ( x ^ y ^ z )
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#define M(i) ( tm = x[i&0x0f] ^ x[(i-14)&0x0f] \
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^ x[(i-8)&0x0f] ^ x[(i-3)&0x0f] \
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, (x[i&0x0f] = rol(tm,1)) )
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#define R(a,b,c,d,e,f,k,m) do { e += rol( a, 5 ) \
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+ f( b, c, d ) \
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+ k \
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+ m; \
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b = rol( b, 30 ); \
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} while(0)
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R( a, b, c, d, e, F1, K1, x[ 0] );
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R( e, a, b, c, d, F1, K1, x[ 1] );
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R( d, e, a, b, c, F1, K1, x[ 2] );
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R( c, d, e, a, b, F1, K1, x[ 3] );
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R( b, c, d, e, a, F1, K1, x[ 4] );
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R( a, b, c, d, e, F1, K1, x[ 5] );
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R( e, a, b, c, d, F1, K1, x[ 6] );
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R( d, e, a, b, c, F1, K1, x[ 7] );
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R( c, d, e, a, b, F1, K1, x[ 8] );
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R( b, c, d, e, a, F1, K1, x[ 9] );
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R( a, b, c, d, e, F1, K1, x[10] );
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R( e, a, b, c, d, F1, K1, x[11] );
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R( d, e, a, b, c, F1, K1, x[12] );
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R( c, d, e, a, b, F1, K1, x[13] );
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R( b, c, d, e, a, F1, K1, x[14] );
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R( a, b, c, d, e, F1, K1, x[15] );
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R( e, a, b, c, d, F1, K1, M(16) );
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R( d, e, a, b, c, F1, K1, M(17) );
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R( c, d, e, a, b, F1, K1, M(18) );
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R( b, c, d, e, a, F1, K1, M(19) );
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R( a, b, c, d, e, F2, K2, M(20) );
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R( e, a, b, c, d, F2, K2, M(21) );
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R( d, e, a, b, c, F2, K2, M(22) );
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R( c, d, e, a, b, F2, K2, M(23) );
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R( b, c, d, e, a, F2, K2, M(24) );
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R( a, b, c, d, e, F2, K2, M(25) );
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R( e, a, b, c, d, F2, K2, M(26) );
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R( d, e, a, b, c, F2, K2, M(27) );
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R( c, d, e, a, b, F2, K2, M(28) );
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R( b, c, d, e, a, F2, K2, M(29) );
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R( a, b, c, d, e, F2, K2, M(30) );
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R( e, a, b, c, d, F2, K2, M(31) );
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R( d, e, a, b, c, F2, K2, M(32) );
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R( c, d, e, a, b, F2, K2, M(33) );
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R( b, c, d, e, a, F2, K2, M(34) );
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R( a, b, c, d, e, F2, K2, M(35) );
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R( e, a, b, c, d, F2, K2, M(36) );
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R( d, e, a, b, c, F2, K2, M(37) );
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R( c, d, e, a, b, F2, K2, M(38) );
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R( b, c, d, e, a, F2, K2, M(39) );
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R( a, b, c, d, e, F3, K3, M(40) );
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R( e, a, b, c, d, F3, K3, M(41) );
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R( d, e, a, b, c, F3, K3, M(42) );
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R( c, d, e, a, b, F3, K3, M(43) );
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R( b, c, d, e, a, F3, K3, M(44) );
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R( a, b, c, d, e, F3, K3, M(45) );
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R( e, a, b, c, d, F3, K3, M(46) );
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R( d, e, a, b, c, F3, K3, M(47) );
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R( c, d, e, a, b, F3, K3, M(48) );
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R( b, c, d, e, a, F3, K3, M(49) );
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R( a, b, c, d, e, F3, K3, M(50) );
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R( e, a, b, c, d, F3, K3, M(51) );
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R( d, e, a, b, c, F3, K3, M(52) );
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R( c, d, e, a, b, F3, K3, M(53) );
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R( b, c, d, e, a, F3, K3, M(54) );
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R( a, b, c, d, e, F3, K3, M(55) );
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R( e, a, b, c, d, F3, K3, M(56) );
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R( d, e, a, b, c, F3, K3, M(57) );
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R( c, d, e, a, b, F3, K3, M(58) );
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R( b, c, d, e, a, F3, K3, M(59) );
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R( a, b, c, d, e, F4, K4, M(60) );
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R( e, a, b, c, d, F4, K4, M(61) );
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R( d, e, a, b, c, F4, K4, M(62) );
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R( c, d, e, a, b, F4, K4, M(63) );
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R( b, c, d, e, a, F4, K4, M(64) );
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R( a, b, c, d, e, F4, K4, M(65) );
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R( e, a, b, c, d, F4, K4, M(66) );
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R( d, e, a, b, c, F4, K4, M(67) );
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R( c, d, e, a, b, F4, K4, M(68) );
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R( b, c, d, e, a, F4, K4, M(69) );
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R( a, b, c, d, e, F4, K4, M(70) );
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R( e, a, b, c, d, F4, K4, M(71) );
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R( d, e, a, b, c, F4, K4, M(72) );
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R( c, d, e, a, b, F4, K4, M(73) );
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R( b, c, d, e, a, F4, K4, M(74) );
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R( a, b, c, d, e, F4, K4, M(75) );
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R( e, a, b, c, d, F4, K4, M(76) );
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R( d, e, a, b, c, F4, K4, M(77) );
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R( c, d, e, a, b, F4, K4, M(78) );
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R( b, c, d, e, a, F4, K4, M(79) );
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/* update chainig vars */
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hd->h0 += a;
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hd->h1 += b;
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hd->h2 += c;
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hd->h3 += d;
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hd->h4 += e;
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}
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/* Update the message digest with the contents
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* of INBUF with length INLEN.
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*/
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static void
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sha1_write( SHA1_CONTEXT *hd, byte *inbuf, size_t inlen)
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{
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if( hd->count == 64 ) { /* flush the buffer */
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transform( hd, hd->buf );
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burn_stack (88+4*sizeof(void*));
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hd->count = 0;
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hd->nblocks++;
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}
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if( !inbuf )
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return;
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if( hd->count ) {
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for( ; inlen && hd->count < 64; inlen-- )
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hd->buf[hd->count++] = *inbuf++;
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sha1_write( hd, NULL, 0 );
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if( !inlen )
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return;
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}
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while( inlen >= 64 ) {
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transform( hd, inbuf );
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hd->count = 0;
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hd->nblocks++;
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inlen -= 64;
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inbuf += 64;
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}
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burn_stack (88+4*sizeof(void*));
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for( ; inlen && hd->count < 64; inlen-- )
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hd->buf[hd->count++] = *inbuf++;
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}
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/* The routine final terminates the computation and
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* returns the digest.
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* The handle is prepared for a new cycle, but adding bytes to the
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* handle will the destroy the returned buffer.
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* Returns: 20 bytes representing the digest.
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*/
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static void
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sha1_final(SHA1_CONTEXT *hd)
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{
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u32 t, msb, lsb;
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byte *p;
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sha1_write(hd, NULL, 0); /* flush */;
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t = hd->nblocks;
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/* multiply by 64 to make a byte count */
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lsb = t << 6;
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msb = t >> 26;
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/* add the count */
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t = lsb;
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if( (lsb += hd->count) < t )
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msb++;
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/* multiply by 8 to make a bit count */
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t = lsb;
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lsb <<= 3;
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msb <<= 3;
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msb |= t >> 29;
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if( hd->count < 56 ) { /* enough room */
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hd->buf[hd->count++] = 0x80; /* pad */
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while( hd->count < 56 )
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hd->buf[hd->count++] = 0; /* pad */
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}
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else { /* need one extra block */
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hd->buf[hd->count++] = 0x80; /* pad character */
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while( hd->count < 64 )
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hd->buf[hd->count++] = 0;
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sha1_write(hd, NULL, 0); /* flush */;
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memset(hd->buf, 0, 56 ); /* fill next block with zeroes */
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}
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/* append the 64 bit count */
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hd->buf[56] = msb >> 24;
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hd->buf[57] = msb >> 16;
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hd->buf[58] = msb >> 8;
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hd->buf[59] = msb ;
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hd->buf[60] = lsb >> 24;
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hd->buf[61] = lsb >> 16;
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hd->buf[62] = lsb >> 8;
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hd->buf[63] = lsb ;
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transform( hd, hd->buf );
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burn_stack (88+4*sizeof(void*));
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p = hd->buf;
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#ifdef BIG_ENDIAN_HOST
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#define X(a) do { *(u32*)p = hd->h##a ; p += 4; } while(0)
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#else /* little endian */
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#define X(a) do { *p++ = hd->h##a >> 24; *p++ = hd->h##a >> 16; \
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*p++ = hd->h##a >> 8; *p++ = hd->h##a; } while(0)
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#endif
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X(0);
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X(1);
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X(2);
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X(3);
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X(4);
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#undef X
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}
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static byte *
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sha1_read( SHA1_CONTEXT *hd )
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{
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return hd->buf;
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}
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/****************
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* Return some information about the algorithm. We need algo here to
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* distinguish different flavors of the algorithm.
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* Returns: A pointer to string describing the algorithm or NULL if
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* the ALGO is invalid.
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*/
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const char *
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sha1_get_info( int algo, size_t *contextsize,
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byte **r_asnoid, int *r_asnlen, int *r_mdlen,
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void (**r_init)( void *c ),
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void (**r_write)( void *c, byte *buf, size_t nbytes ),
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void (**r_final)( void *c ),
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byte *(**r_read)( void *c )
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)
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{
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static byte asn[15] = /* Object ID is 1.3.14.3.2.26 */
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{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
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0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 };
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if( algo != 2 )
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return NULL;
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*contextsize = sizeof(SHA1_CONTEXT);
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*r_asnoid = asn;
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*r_asnlen = DIM(asn);
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*r_mdlen = 20;
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*(void (**)(SHA1_CONTEXT *))r_init = sha1_init;
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*(void (**)(SHA1_CONTEXT *, byte*, size_t))r_write = sha1_write;
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*(void (**)(SHA1_CONTEXT *))r_final = sha1_final;
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*(byte *(**)(SHA1_CONTEXT *))r_read = sha1_read;
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return "SHA1";
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}
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