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478 lines
12 KiB
C
478 lines
12 KiB
C
/* sha1.c - SHA1 hash function
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* Copyright (C) 1998, 2001, 2002, 2003, 2008 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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 Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, see <http://www.gnu.org/licenses/>.
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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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#ifdef HAVE_STDINT_H
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# include <stdint.h>
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#endif
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#include "g10lib.h"
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#include "bithelp.h"
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#include "cipher.h"
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#include "hash-common.h"
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/* A macro to test whether P is properly aligned for an u32 type.
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Note that config.h provides a suitable replacement for uintptr_t if
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it does not exist in stdint.h. */
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/* #if __GNUC__ >= 2 */
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/* # define U32_ALIGNED_P(p) (!(((uintptr_t)p) % __alignof__ (u32))) */
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/* #else */
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/* # define U32_ALIGNED_P(p) (!(((uintptr_t)p) % sizeof (u32))) */
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/* #endif */
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#define TRANSFORM(x,d,n) transform ((x), (d), (n))
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typedef struct
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{
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u32 h0,h1,h2,h3,h4;
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u32 nblocks;
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unsigned char buf[64];
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int count;
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} SHA1_CONTEXT;
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static void
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sha1_init (void *context)
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{
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SHA1_CONTEXT *hd = context;
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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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/* Round function macros. */
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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] \
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^ x[(i-14)&0x0f] \
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^ x[(i-8) &0x0f] \
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^ 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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/*
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* Transform NBLOCKS of each 64 bytes (16 32-bit words) at DATA.
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*/
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static void
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transform (SHA1_CONTEXT *hd, const unsigned char *data, size_t nblocks)
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{
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register u32 a, b, c, d, e; /* Local copies of the chaining variables. */
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register u32 tm; /* Helper. */
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u32 x[16]; /* The array we work on. */
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/* Loop over all blocks. */
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for ( ;nblocks; nblocks--)
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{
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#ifdef WORDS_BIGENDIAN
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memcpy (x, data, 64);
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data += 64;
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#else
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{
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int i;
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unsigned char *p;
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for(i=0, p=(unsigned char*)x; i < 16; i++, p += 4 )
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{
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p[3] = *data++;
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p[2] = *data++;
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p[1] = *data++;
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p[0] = *data++;
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}
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}
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#endif
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/* Get the values of the chaining variables. */
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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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/* Transform. */
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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 the chaining variables. */
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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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/* 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( void *context, const void *inbuf_arg, size_t inlen)
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{
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const unsigned char *inbuf = inbuf_arg;
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SHA1_CONTEXT *hd = context;
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size_t nblocks;
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if (hd->count == 64) /* Flush the buffer. */
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{
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TRANSFORM( hd, hd->buf, 1 );
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_gcry_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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{
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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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nblocks = inlen / 64;
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if (nblocks)
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{
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TRANSFORM (hd, inbuf, nblocks);
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hd->count = 0;
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hd->nblocks += nblocks;
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inlen -= nblocks * 64;
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inbuf += nblocks * 64;
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}
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_gcry_burn_stack (88+4*sizeof(void*));
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/* Save remaining bytes. */
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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(void *context)
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{
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SHA1_CONTEXT *hd = context;
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u32 t, msb, lsb;
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unsigned char *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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{
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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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{
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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, 1 );
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_gcry_burn_stack (88+4*sizeof(void*));
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p = hd->buf;
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#ifdef WORDS_BIGENDIAN
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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 unsigned char *
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sha1_read( void *context )
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{
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SHA1_CONTEXT *hd = context;
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return hd->buf;
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}
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/****************
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* Shortcut functions which puts the hash value of the supplied buffer
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* into outbuf which must have a size of 20 bytes.
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*/
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void
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_gcry_sha1_hash_buffer (void *outbuf, const void *buffer, size_t length)
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{
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SHA1_CONTEXT hd;
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sha1_init (&hd);
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sha1_write (&hd, buffer, length);
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sha1_final (&hd);
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memcpy (outbuf, hd.buf, 20);
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}
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/*
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Self-test section.
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*/
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static gpg_err_code_t
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selftests_sha1 (int extended, selftest_report_func_t report)
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{
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const char *what;
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const char *errtxt;
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what = "short string";
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errtxt = _gcry_hash_selftest_check_one
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(GCRY_MD_SHA1, 0,
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"abc", 3,
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"\xA9\x99\x3E\x36\x47\x06\x81\x6A\xBA\x3E"
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"\x25\x71\x78\x50\xC2\x6C\x9C\xD0\xD8\x9D", 20);
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if (errtxt)
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goto failed;
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if (extended)
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{
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what = "long string";
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errtxt = _gcry_hash_selftest_check_one
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(GCRY_MD_SHA1, 0,
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"abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56,
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"\x84\x98\x3E\x44\x1C\x3B\xD2\x6E\xBA\xAE"
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"\x4A\xA1\xF9\x51\x29\xE5\xE5\x46\x70\xF1", 20);
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if (errtxt)
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goto failed;
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what = "one million \"a\"";
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errtxt = _gcry_hash_selftest_check_one
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(GCRY_MD_SHA1, 1,
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NULL, 0,
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"\x34\xAA\x97\x3C\xD4\xC4\xDA\xA4\xF6\x1E"
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"\xEB\x2B\xDB\xAD\x27\x31\x65\x34\x01\x6F", 20);
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if (errtxt)
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goto failed;
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}
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return 0; /* Succeeded. */
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failed:
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if (report)
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report ("digest", GCRY_MD_SHA1, what, errtxt);
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return GPG_ERR_SELFTEST_FAILED;
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}
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/* Run a full self-test for ALGO and return 0 on success. */
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static gpg_err_code_t
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run_selftests (int algo, int extended, selftest_report_func_t report)
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{
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gpg_err_code_t ec;
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switch (algo)
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{
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case GCRY_MD_SHA1:
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ec = selftests_sha1 (extended, report);
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break;
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default:
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ec = GPG_ERR_DIGEST_ALGO;
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break;
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}
|
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return ec;
|
||
}
|
||
|
||
|
||
|
||
|
||
static unsigned char asn[15] = /* Object ID is 1.3.14.3.2.26 */
|
||
{ 0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03,
|
||
0x02, 0x1a, 0x05, 0x00, 0x04, 0x14 };
|
||
|
||
static gcry_md_oid_spec_t oid_spec_sha1[] =
|
||
{
|
||
/* iso.member-body.us.rsadsi.pkcs.pkcs-1.5 (sha1WithRSAEncryption) */
|
||
{ "1.2.840.113549.1.1.5" },
|
||
/* iso.member-body.us.x9-57.x9cm.3 (dsaWithSha1)*/
|
||
{ "1.2.840.10040.4.3" },
|
||
/* from NIST's OIW (sha1) */
|
||
{ "1.3.14.3.2.26" },
|
||
/* from NIST OIW (sha-1WithRSAEncryption) */
|
||
{ "1.3.14.3.2.29" },
|
||
/* iso.member-body.us.ansi-x9-62.signatures.ecdsa-with-sha1 */
|
||
{ "1.2.840.10045.4.1" },
|
||
{ NULL },
|
||
};
|
||
|
||
gcry_md_spec_t _gcry_digest_spec_sha1 =
|
||
{
|
||
"SHA1", asn, DIM (asn), oid_spec_sha1, 20,
|
||
sha1_init, sha1_write, sha1_final, sha1_read,
|
||
sizeof (SHA1_CONTEXT)
|
||
};
|
||
md_extra_spec_t _gcry_digest_extraspec_sha1 =
|
||
{
|
||
run_selftests
|
||
};
|