b8d967ede5
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@16480 ec53bebd-3082-4978-b11e-865c3cabbd6b
139 lines
4.2 KiB
C
139 lines
4.2 KiB
C
/*
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* Copyright (c) 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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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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*
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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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*
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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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*
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* 3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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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#ifdef HAVE_CONFIG_H
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#include "config.h"
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RCSID("$Id$");
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#endif
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#include "hash.h"
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#include "md2.h"
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static const unsigned char subst[256] = {
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41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
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19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
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76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
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138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
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245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
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148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
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39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
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181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
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150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
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112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
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96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
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85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
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234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
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129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
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8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
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203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
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166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
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31, 26, 219, 153, 141, 51, 159, 17, 131, 20
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};
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void
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MD2_Init (struct md2 *m)
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{
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memset(m, 0, sizeof(*m));
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}
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static void
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calc(struct md2 *m, const void *v)
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{
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unsigned char x[48], L;
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const unsigned char *p = v;
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int i, j, t;
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L = m->checksum[15];
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for (i = 0; i < 16; i++)
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L = m->checksum[i] ^= subst[p[i] ^ L];
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for (i = 0; i < 16; i++) {
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x[i] = m->state[i];
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x[i + 16] = p[i];
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x[i + 32] = x[i] ^ p[i];
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}
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t = 0;
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for (i = 0; i < 18; i++) {
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for (j = 0; j < 48; j++)
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t = x[j] ^= subst[t];
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t = (t + i) & 0xff;
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}
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memcpy(m->state, x, 16);
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memset(x, 0, sizeof(x));
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}
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void
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MD2_Update (struct md2 *m, const void *v, size_t len)
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{
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size_t idx = m->len & 0xf;
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const unsigned char *p = v;
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m->len += len;
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if (len + idx >= 16) {
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if (idx) {
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memcpy(m->data + idx, p, 16 - idx);
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calc(m, m->data);
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p += 16;
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len -= 16 - idx;
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}
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while (len >= 16) {
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calc(m, p);
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p += 16;
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len -= 16;
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}
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idx = 0;
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}
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memcpy(m->data + idx, p, len);
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}
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void
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MD2_Final (void *res, struct md2 *m)
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{
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unsigned char pad[16];
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size_t padlen;
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padlen = 16 - (m->len % 16);
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memset(pad, padlen, padlen);
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MD2_Update(m, pad, padlen);
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memcpy(pad, m->checksum, 16);
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MD2_Update(m, pad, 16);
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memcpy(res, m->state, MD2_DIGEST_LENGTH);
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memset(m, 0, sizeof(m));
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}
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