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309 lines
10 KiB
C
309 lines
10 KiB
C
/* $KAME: md5.c,v 1.5 2000/11/08 06:13:08 itojun Exp $ */
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/*
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* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the project nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if 0
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD: src/sys/crypto/md5.c,v 1.9 2004/01/27 19:49:19 des Exp $");
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#include <sys/types.h>
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#include <sys/cdefs.h>
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#include <sys/time.h>
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#include <sys/systm.h>
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#include <crypto/md5.h>
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#endif
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#define SHIFT(X, s) (((X) << (s)) | ((X) >> (32 - (s))))
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#define F(X, Y, Z) (((X) & (Y)) | ((~X) & (Z)))
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#define G(X, Y, Z) (((X) & (Z)) | ((Y) & (~Z)))
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#define H(X, Y, Z) ((X) ^ (Y) ^ (Z))
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#define I(X, Y, Z) ((Y) ^ ((X) | (~Z)))
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#define ROUND1(a, b, c, d, k, s, i) { \
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(a) = (a) + F((b), (c), (d)) + X[(k)] + T[(i)]; \
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(a) = SHIFT((a), (s)); \
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(a) = (b) + (a); \
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}
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#define ROUND2(a, b, c, d, k, s, i) { \
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(a) = (a) + G((b), (c), (d)) + X[(k)] + T[(i)]; \
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(a) = SHIFT((a), (s)); \
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(a) = (b) + (a); \
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}
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#define ROUND3(a, b, c, d, k, s, i) { \
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(a) = (a) + H((b), (c), (d)) + X[(k)] + T[(i)]; \
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(a) = SHIFT((a), (s)); \
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(a) = (b) + (a); \
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}
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#define ROUND4(a, b, c, d, k, s, i) { \
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(a) = (a) + I((b), (c), (d)) + X[(k)] + T[(i)]; \
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(a) = SHIFT((a), (s)); \
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(a) = (b) + (a); \
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}
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#define Sa 7
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#define Sb 12
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#define Sc 17
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#define Sd 22
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#define Se 5
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#define Sf 9
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#define Sg 14
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#define Sh 20
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#define Si 4
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#define Sj 11
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#define Sk 16
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#define Sl 23
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#define Sm 6
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#define Sn 10
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#define So 15
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#define Sp 21
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#define MD5_A0 0x67452301
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#define MD5_B0 0xefcdab89
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#define MD5_C0 0x98badcfe
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#define MD5_D0 0x10325476
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/* Integer part of 4294967296 times abs(sin(i)), where i is in radians. */
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static const u_int32_t T[65] = {
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0,
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0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
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0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
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0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
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0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
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0xd62f105d, 0x2441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
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0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
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0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
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0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
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0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
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0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
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0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391,
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};
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static const u_int8_t md5_paddat[MD5_BUFLEN] = {
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0x80, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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0, 0, 0, 0, 0, 0, 0, 0,
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};
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static void md5_calc(u_int8_t *, md5_ctxt *);
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void md5_init(ctxt)
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md5_ctxt *ctxt;
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{
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ctxt->md5_n = 0;
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ctxt->md5_i = 0;
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ctxt->md5_sta = MD5_A0;
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ctxt->md5_stb = MD5_B0;
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ctxt->md5_stc = MD5_C0;
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ctxt->md5_std = MD5_D0;
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bzero(ctxt->md5_buf, sizeof(ctxt->md5_buf));
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}
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void md5_loop(ctxt, input, len)
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md5_ctxt *ctxt;
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u_int8_t *input;
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u_int len; /* number of bytes */
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{
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u_int gap, i;
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ctxt->md5_n += len * 8; /* byte to bit */
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gap = MD5_BUFLEN - ctxt->md5_i;
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if (len >= gap) {
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bcopy((void *)input, (void *)(ctxt->md5_buf + ctxt->md5_i),
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gap);
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md5_calc(ctxt->md5_buf, ctxt);
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for (i = gap; i + MD5_BUFLEN <= len; i += MD5_BUFLEN) {
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md5_calc((u_int8_t *)(input + i), ctxt);
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}
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ctxt->md5_i = len - i;
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bcopy((void *)(input + i), (void *)ctxt->md5_buf, ctxt->md5_i);
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} else {
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bcopy((void *)input, (void *)(ctxt->md5_buf + ctxt->md5_i),
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len);
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ctxt->md5_i += len;
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}
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}
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void md5_pad(ctxt)
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md5_ctxt *ctxt;
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{
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u_int gap;
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/* Don't count up padding. Keep md5_n. */
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gap = MD5_BUFLEN - ctxt->md5_i;
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if (gap > 8) {
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bcopy(md5_paddat,
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(void *)(ctxt->md5_buf + ctxt->md5_i),
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gap - sizeof(ctxt->md5_n));
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} else {
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/* including gap == 8 */
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bcopy(md5_paddat, (void *)(ctxt->md5_buf + ctxt->md5_i),
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gap);
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md5_calc(ctxt->md5_buf, ctxt);
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bcopy((md5_paddat + gap),
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(void *)ctxt->md5_buf,
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MD5_BUFLEN - sizeof(ctxt->md5_n));
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}
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/* 8 byte word */
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#if BYTE_ORDER == LITTLE_ENDIAN
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bcopy(&ctxt->md5_n8[0], &ctxt->md5_buf[56], 8);
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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ctxt->md5_buf[56] = ctxt->md5_n8[7];
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ctxt->md5_buf[57] = ctxt->md5_n8[6];
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ctxt->md5_buf[58] = ctxt->md5_n8[5];
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ctxt->md5_buf[59] = ctxt->md5_n8[4];
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ctxt->md5_buf[60] = ctxt->md5_n8[3];
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ctxt->md5_buf[61] = ctxt->md5_n8[2];
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ctxt->md5_buf[62] = ctxt->md5_n8[1];
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ctxt->md5_buf[63] = ctxt->md5_n8[0];
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#endif
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md5_calc(ctxt->md5_buf, ctxt);
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}
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void md5_result(digest, ctxt)
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u_int8_t *digest;
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md5_ctxt *ctxt;
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{
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/* 4 byte words */
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#if BYTE_ORDER == LITTLE_ENDIAN
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bcopy(&ctxt->md5_st8[0], digest, 16);
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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digest[ 0] = ctxt->md5_st8[ 3]; digest[ 1] = ctxt->md5_st8[ 2];
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digest[ 2] = ctxt->md5_st8[ 1]; digest[ 3] = ctxt->md5_st8[ 0];
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digest[ 4] = ctxt->md5_st8[ 7]; digest[ 5] = ctxt->md5_st8[ 6];
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digest[ 6] = ctxt->md5_st8[ 5]; digest[ 7] = ctxt->md5_st8[ 4];
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digest[ 8] = ctxt->md5_st8[11]; digest[ 9] = ctxt->md5_st8[10];
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digest[10] = ctxt->md5_st8[ 9]; digest[11] = ctxt->md5_st8[ 8];
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digest[12] = ctxt->md5_st8[15]; digest[13] = ctxt->md5_st8[14];
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digest[14] = ctxt->md5_st8[13]; digest[15] = ctxt->md5_st8[12];
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#endif
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}
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static void md5_calc(b64, ctxt)
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u_int8_t *b64;
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md5_ctxt *ctxt;
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{
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u_int32_t A = ctxt->md5_sta;
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u_int32_t B = ctxt->md5_stb;
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u_int32_t C = ctxt->md5_stc;
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u_int32_t D = ctxt->md5_std;
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#if BYTE_ORDER == LITTLE_ENDIAN
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u_int32_t *X = (u_int32_t *)b64;
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#endif
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#if BYTE_ORDER == BIG_ENDIAN
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/* 4 byte words */
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/* what a brute force but fast! */
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u_int32_t X[16];
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u_int8_t *y = (u_int8_t *)X;
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y[ 0] = b64[ 3]; y[ 1] = b64[ 2]; y[ 2] = b64[ 1]; y[ 3] = b64[ 0];
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y[ 4] = b64[ 7]; y[ 5] = b64[ 6]; y[ 6] = b64[ 5]; y[ 7] = b64[ 4];
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y[ 8] = b64[11]; y[ 9] = b64[10]; y[10] = b64[ 9]; y[11] = b64[ 8];
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y[12] = b64[15]; y[13] = b64[14]; y[14] = b64[13]; y[15] = b64[12];
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y[16] = b64[19]; y[17] = b64[18]; y[18] = b64[17]; y[19] = b64[16];
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y[20] = b64[23]; y[21] = b64[22]; y[22] = b64[21]; y[23] = b64[20];
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y[24] = b64[27]; y[25] = b64[26]; y[26] = b64[25]; y[27] = b64[24];
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y[28] = b64[31]; y[29] = b64[30]; y[30] = b64[29]; y[31] = b64[28];
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y[32] = b64[35]; y[33] = b64[34]; y[34] = b64[33]; y[35] = b64[32];
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y[36] = b64[39]; y[37] = b64[38]; y[38] = b64[37]; y[39] = b64[36];
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y[40] = b64[43]; y[41] = b64[42]; y[42] = b64[41]; y[43] = b64[40];
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y[44] = b64[47]; y[45] = b64[46]; y[46] = b64[45]; y[47] = b64[44];
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y[48] = b64[51]; y[49] = b64[50]; y[50] = b64[49]; y[51] = b64[48];
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y[52] = b64[55]; y[53] = b64[54]; y[54] = b64[53]; y[55] = b64[52];
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y[56] = b64[59]; y[57] = b64[58]; y[58] = b64[57]; y[59] = b64[56];
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y[60] = b64[63]; y[61] = b64[62]; y[62] = b64[61]; y[63] = b64[60];
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#endif
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ROUND1(A, B, C, D, 0, Sa, 1); ROUND1(D, A, B, C, 1, Sb, 2);
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ROUND1(C, D, A, B, 2, Sc, 3); ROUND1(B, C, D, A, 3, Sd, 4);
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ROUND1(A, B, C, D, 4, Sa, 5); ROUND1(D, A, B, C, 5, Sb, 6);
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ROUND1(C, D, A, B, 6, Sc, 7); ROUND1(B, C, D, A, 7, Sd, 8);
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ROUND1(A, B, C, D, 8, Sa, 9); ROUND1(D, A, B, C, 9, Sb, 10);
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ROUND1(C, D, A, B, 10, Sc, 11); ROUND1(B, C, D, A, 11, Sd, 12);
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ROUND1(A, B, C, D, 12, Sa, 13); ROUND1(D, A, B, C, 13, Sb, 14);
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ROUND1(C, D, A, B, 14, Sc, 15); ROUND1(B, C, D, A, 15, Sd, 16);
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ROUND2(A, B, C, D, 1, Se, 17); ROUND2(D, A, B, C, 6, Sf, 18);
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ROUND2(C, D, A, B, 11, Sg, 19); ROUND2(B, C, D, A, 0, Sh, 20);
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ROUND2(A, B, C, D, 5, Se, 21); ROUND2(D, A, B, C, 10, Sf, 22);
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ROUND2(C, D, A, B, 15, Sg, 23); ROUND2(B, C, D, A, 4, Sh, 24);
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ROUND2(A, B, C, D, 9, Se, 25); ROUND2(D, A, B, C, 14, Sf, 26);
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ROUND2(C, D, A, B, 3, Sg, 27); ROUND2(B, C, D, A, 8, Sh, 28);
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ROUND2(A, B, C, D, 13, Se, 29); ROUND2(D, A, B, C, 2, Sf, 30);
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ROUND2(C, D, A, B, 7, Sg, 31); ROUND2(B, C, D, A, 12, Sh, 32);
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ROUND3(A, B, C, D, 5, Si, 33); ROUND3(D, A, B, C, 8, Sj, 34);
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ROUND3(C, D, A, B, 11, Sk, 35); ROUND3(B, C, D, A, 14, Sl, 36);
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ROUND3(A, B, C, D, 1, Si, 37); ROUND3(D, A, B, C, 4, Sj, 38);
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ROUND3(C, D, A, B, 7, Sk, 39); ROUND3(B, C, D, A, 10, Sl, 40);
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ROUND3(A, B, C, D, 13, Si, 41); ROUND3(D, A, B, C, 0, Sj, 42);
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ROUND3(C, D, A, B, 3, Sk, 43); ROUND3(B, C, D, A, 6, Sl, 44);
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ROUND3(A, B, C, D, 9, Si, 45); ROUND3(D, A, B, C, 12, Sj, 46);
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ROUND3(C, D, A, B, 15, Sk, 47); ROUND3(B, C, D, A, 2, Sl, 48);
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ROUND4(A, B, C, D, 0, Sm, 49); ROUND4(D, A, B, C, 7, Sn, 50);
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ROUND4(C, D, A, B, 14, So, 51); ROUND4(B, C, D, A, 5, Sp, 52);
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ROUND4(A, B, C, D, 12, Sm, 53); ROUND4(D, A, B, C, 3, Sn, 54);
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ROUND4(C, D, A, B, 10, So, 55); ROUND4(B, C, D, A, 1, Sp, 56);
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ROUND4(A, B, C, D, 8, Sm, 57); ROUND4(D, A, B, C, 15, Sn, 58);
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ROUND4(C, D, A, B, 6, So, 59); ROUND4(B, C, D, A, 13, Sp, 60);
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ROUND4(A, B, C, D, 4, Sm, 61); ROUND4(D, A, B, C, 11, Sn, 62);
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ROUND4(C, D, A, B, 2, So, 63); ROUND4(B, C, D, A, 9, Sp, 64);
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ctxt->md5_sta += A;
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ctxt->md5_stb += B;
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ctxt->md5_stc += C;
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ctxt->md5_std += D;
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}
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