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/* 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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|
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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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|
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|
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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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|
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#include "md.h" |
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|
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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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|
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memset(buf, 0, 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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|
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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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|
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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, unsigned char *data ) |
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{ |
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unsigned long a,b,c,d,e,tm; |
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unsigned long x[16]; |
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|
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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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|
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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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unsigned char *p2; |
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for(i=0, p2=(unsigned char*)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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|
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|
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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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|
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|
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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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|
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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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|
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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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|
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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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void |
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sha1_write( SHA1_CONTEXT *hd, unsigned char *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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|
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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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|
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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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|
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void |
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sha1_final(SHA1_CONTEXT *hd) |
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{ |
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unsigned long t, msb, lsb; |
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unsigned char *p; |
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|
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sha1_write(hd, NULL, 0); /* flush */; |
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|
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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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|
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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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|
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p = hd->buf; |
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#ifdef BIG_ENDIAN_HOST |
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#define X(a) do { *(unsigned long*)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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} |
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|
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unsigned char * |
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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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