mirror of
git://git.gnupg.org/gnupg.git
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90279250e8
(burn_stack), random.c (burn_stack, read_pool, fast_random_poll), rijndael.c (burn_stack), rmd160.c (burn_stack), rndegd.c (rndegd_gather_random), rndlinux.c (rndlinux_gather_random), rndriscos.c (rndriscos_gather_random), sha1.c (burn_stack), tiger.c (burn_stack), twofish.c (burn_stack): Replace various calls to memset() with the more secure wipememory().
368 lines
10 KiB
C
368 lines
10 KiB
C
/* md5.c - MD5 Message-Digest Algorithm
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* Copyright (C) 1995, 1996, 1998, 1999,
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* 2000, 2001 Free Software Foundation, Inc.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2, or (at your option) any
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* later version.
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*
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* This program 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 Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* According to the definition of MD5 in RFC 1321 from April 1992.
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* NOTE: This is *not* the same file as the one from glibc.
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*/
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/* Written by Ulrich Drepper <drepper@gnu.ai.mit.edu>, 1995. */
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/* Heavily modified for GnuPG by <wk@gnupg.org> */
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/* Test values:
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* "" D4 1D 8C D9 8F 00 B2 04 E9 80 09 98 EC F8 42 7E
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* "a" 0C C1 75 B9 C0 F1 B6 A8 31 C3 99 E2 69 77 26 61
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* "abc 90 01 50 98 3C D2 4F B0 D6 96 3F 7D 28 E1 7F 72
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* "message digest" F9 6B 69 7D 7C B7 93 8D 52 5A 2F 31 AA F1 61 D0
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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 A,B,C,D; /* chaining variables */
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u32 nblocks;
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byte buf[64];
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int count;
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} MD5_CONTEXT;
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static void
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md5_init( MD5_CONTEXT *ctx )
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{
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ctx->A = 0x67452301;
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ctx->B = 0xefcdab89;
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ctx->C = 0x98badcfe;
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ctx->D = 0x10325476;
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ctx->nblocks = 0;
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ctx->count = 0;
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}
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/* These are the four functions used in the four steps of the MD5 algorithm
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and defined in the RFC 1321. The first function is a little bit optimized
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(as found in Colin Plumbs public domain implementation). */
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/* #define FF(b, c, d) ((b & c) | (~b & d)) */
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#define FF(b, c, d) (d ^ (b & (c ^ d)))
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#define FG(b, c, d) FF (d, b, c)
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#define FH(b, c, d) (b ^ c ^ d)
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#define FI(b, c, d) (c ^ (b | ~d))
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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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/****************
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* transform n*64 bytes
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*/
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static void
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/*transform( MD5_CONTEXT *ctx, const void *buffer, size_t len )*/
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transform( MD5_CONTEXT *ctx, byte *data )
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{
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u32 correct_words[16];
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u32 A = ctx->A;
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u32 B = ctx->B;
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u32 C = ctx->C;
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u32 D = ctx->D;
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u32 *cwp = correct_words;
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#ifdef BIG_ENDIAN_HOST
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{ int i;
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byte *p2, *p1;
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for(i=0, p1=data, p2=(byte*)correct_words; i < 16; i++, p2 += 4 ) {
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p2[3] = *p1++;
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p2[2] = *p1++;
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p2[1] = *p1++;
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p2[0] = *p1++;
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}
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}
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#else
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memcpy( correct_words, data, 64 );
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#endif
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#define OP(a, b, c, d, s, T) \
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do \
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{ \
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a += FF (b, c, d) + (*cwp++) + T; \
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a = rol(a, s); \
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a += b; \
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} \
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while (0)
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/* Before we start, one word about the strange constants.
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They are defined in RFC 1321 as
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T[i] = (int) (4294967296.0 * fabs (sin (i))), i=1..64
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*/
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/* Round 1. */
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OP (A, B, C, D, 7, 0xd76aa478);
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OP (D, A, B, C, 12, 0xe8c7b756);
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OP (C, D, A, B, 17, 0x242070db);
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OP (B, C, D, A, 22, 0xc1bdceee);
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OP (A, B, C, D, 7, 0xf57c0faf);
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OP (D, A, B, C, 12, 0x4787c62a);
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OP (C, D, A, B, 17, 0xa8304613);
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OP (B, C, D, A, 22, 0xfd469501);
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OP (A, B, C, D, 7, 0x698098d8);
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OP (D, A, B, C, 12, 0x8b44f7af);
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OP (C, D, A, B, 17, 0xffff5bb1);
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OP (B, C, D, A, 22, 0x895cd7be);
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OP (A, B, C, D, 7, 0x6b901122);
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OP (D, A, B, C, 12, 0xfd987193);
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OP (C, D, A, B, 17, 0xa679438e);
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OP (B, C, D, A, 22, 0x49b40821);
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#undef OP
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#define OP(f, a, b, c, d, k, s, T) \
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do \
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{ \
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a += f (b, c, d) + correct_words[k] + T; \
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a = rol(a, s); \
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a += b; \
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} \
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while (0)
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/* Round 2. */
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OP (FG, A, B, C, D, 1, 5, 0xf61e2562);
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OP (FG, D, A, B, C, 6, 9, 0xc040b340);
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OP (FG, C, D, A, B, 11, 14, 0x265e5a51);
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OP (FG, B, C, D, A, 0, 20, 0xe9b6c7aa);
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OP (FG, A, B, C, D, 5, 5, 0xd62f105d);
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OP (FG, D, A, B, C, 10, 9, 0x02441453);
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OP (FG, C, D, A, B, 15, 14, 0xd8a1e681);
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OP (FG, B, C, D, A, 4, 20, 0xe7d3fbc8);
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OP (FG, A, B, C, D, 9, 5, 0x21e1cde6);
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OP (FG, D, A, B, C, 14, 9, 0xc33707d6);
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OP (FG, C, D, A, B, 3, 14, 0xf4d50d87);
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OP (FG, B, C, D, A, 8, 20, 0x455a14ed);
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OP (FG, A, B, C, D, 13, 5, 0xa9e3e905);
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OP (FG, D, A, B, C, 2, 9, 0xfcefa3f8);
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OP (FG, C, D, A, B, 7, 14, 0x676f02d9);
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OP (FG, B, C, D, A, 12, 20, 0x8d2a4c8a);
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/* Round 3. */
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OP (FH, A, B, C, D, 5, 4, 0xfffa3942);
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OP (FH, D, A, B, C, 8, 11, 0x8771f681);
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OP (FH, C, D, A, B, 11, 16, 0x6d9d6122);
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OP (FH, B, C, D, A, 14, 23, 0xfde5380c);
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OP (FH, A, B, C, D, 1, 4, 0xa4beea44);
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OP (FH, D, A, B, C, 4, 11, 0x4bdecfa9);
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OP (FH, C, D, A, B, 7, 16, 0xf6bb4b60);
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OP (FH, B, C, D, A, 10, 23, 0xbebfbc70);
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OP (FH, A, B, C, D, 13, 4, 0x289b7ec6);
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OP (FH, D, A, B, C, 0, 11, 0xeaa127fa);
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OP (FH, C, D, A, B, 3, 16, 0xd4ef3085);
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OP (FH, B, C, D, A, 6, 23, 0x04881d05);
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OP (FH, A, B, C, D, 9, 4, 0xd9d4d039);
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OP (FH, D, A, B, C, 12, 11, 0xe6db99e5);
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OP (FH, C, D, A, B, 15, 16, 0x1fa27cf8);
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OP (FH, B, C, D, A, 2, 23, 0xc4ac5665);
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/* Round 4. */
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OP (FI, A, B, C, D, 0, 6, 0xf4292244);
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OP (FI, D, A, B, C, 7, 10, 0x432aff97);
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OP (FI, C, D, A, B, 14, 15, 0xab9423a7);
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OP (FI, B, C, D, A, 5, 21, 0xfc93a039);
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OP (FI, A, B, C, D, 12, 6, 0x655b59c3);
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OP (FI, D, A, B, C, 3, 10, 0x8f0ccc92);
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OP (FI, C, D, A, B, 10, 15, 0xffeff47d);
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OP (FI, B, C, D, A, 1, 21, 0x85845dd1);
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OP (FI, A, B, C, D, 8, 6, 0x6fa87e4f);
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OP (FI, D, A, B, C, 15, 10, 0xfe2ce6e0);
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OP (FI, C, D, A, B, 6, 15, 0xa3014314);
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OP (FI, B, C, D, A, 13, 21, 0x4e0811a1);
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OP (FI, A, B, C, D, 4, 6, 0xf7537e82);
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OP (FI, D, A, B, C, 11, 10, 0xbd3af235);
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OP (FI, C, D, A, B, 2, 15, 0x2ad7d2bb);
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OP (FI, B, C, D, A, 9, 21, 0xeb86d391);
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/* Put checksum in context given as argument. */
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ctx->A += A;
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ctx->B += B;
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ctx->C += C;
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ctx->D += D;
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}
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/* The routine updates the message-digest context to
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* account for the presence of each of the characters inBuf[0..inLen-1]
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* in the message whose digest is being computed.
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*/
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static void
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md5_write( MD5_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 (80+6*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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md5_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 (80+6*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 message-digest computation and
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* ends with the desired message digest in mdContext->digest[0...15].
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* The handle is prepared for a new MD5 cycle.
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* Returns 16 bytes representing the digest.
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*/
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static void
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md5_final( MD5_CONTEXT *hd )
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{
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u32 t, msb, lsb;
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byte *p;
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md5_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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md5_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] = lsb ;
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hd->buf[57] = lsb >> 8;
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hd->buf[58] = lsb >> 16;
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hd->buf[59] = lsb >> 24;
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hd->buf[60] = msb ;
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hd->buf[61] = msb >> 8;
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hd->buf[62] = msb >> 16;
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hd->buf[63] = msb >> 24;
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transform( hd, hd->buf );
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burn_stack (80+6*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 { *p++ = hd-> a ; *p++ = hd-> a >> 8; \
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*p++ = hd-> a >> 16; *p++ = hd-> a >> 24; } while(0)
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#else /* little endian */
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#define X(a) do { *(u32*)p = hd-> a ; p += 4; } while(0)
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#endif
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X(A);
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X(B);
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X(C);
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X(D);
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#undef X
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}
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static byte *
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md5_read( MD5_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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md5_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[18] = /* Object ID is 1.2.840.113549.2.5 */
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{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
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0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10 };
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if( algo != 1 )
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return NULL;
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*contextsize = sizeof(MD5_CONTEXT);
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*r_asnoid = asn;
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*r_asnlen = DIM(asn);
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*r_mdlen = 16;
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*(void (**)(MD5_CONTEXT *))r_init = md5_init;
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*(void (**)(MD5_CONTEXT *, byte*, size_t))r_write = md5_write;
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*(void (**)(MD5_CONTEXT *))r_final = md5_final;
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*(byte *(**)(MD5_CONTEXT *))r_read = md5_read;
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return "MD5";
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}
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