191 lines
6.3 KiB
C
191 lines
6.3 KiB
C
/**
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* @file md2.c
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* @version $Format:%h%d$
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*
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* MD2 hash implementation.
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*/
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/*
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* Copyright (c) 2013-2017 INSIDE Secure Corporation
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* Copyright (c) PeerSec Networks, 2002-2011
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* All Rights Reserved
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*
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* The latest version of this code is available at http://www.matrixssl.org
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*
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* This software is open source; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This General Public License does NOT permit incorporating this software
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* into proprietary programs. If you are unable to comply with the GPL, a
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* commercial license for this software may be purchased from INSIDE at
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* http://www.insidesecure.com/
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*
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* This program is distributed in WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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* See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* http://www.gnu.org/copyleft/gpl.html
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*/
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/******************************************************************************/
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#include "../cryptoImpl.h"
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#ifdef USE_MATRIX_MD2
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/******************************************************************************/
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static const unsigned char PI_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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/* adds 16 bytes to the checksum */
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static void md2_update_chksum(psMd2_t *md)
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{
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int32 j;
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unsigned char L;
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L = md->chksum[15];
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for (j = 0; j < 16; j++)
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{
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/*
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caution, the RFC says its "C[j] = S[M[i*16+j] xor L]" but the reference
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source code [and test vectors] say otherwise.
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*/
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L = (md->chksum[j] ^= PI_SUBST[(int32) (md->buf[j] ^ L)] & 255);
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}
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}
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static void md2_compress(psMd2_t *md)
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{
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int32 j, k;
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unsigned char t;
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/* copy block */
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for (j = 0; j < 16; j++)
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{
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md->X[16 + j] = md->buf[j];
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md->X[32 + j] = md->X[j] ^ md->X[16 + j];
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}
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t = (unsigned char) 0;
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/* do 18 rounds */
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for (j = 0; j < 18; j++)
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{
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for (k = 0; k < 48; k++)
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{
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t = (md->X[k] ^= PI_SUBST[(int32) (t & 255)]);
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}
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t = (t + (unsigned char) j) & 255;
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}
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}
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void psMd2Init(psMd2_t *md)
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{
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# ifdef CRYPTO_ASSERT
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psAssert(md != NULL);
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# endif
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/* MD2 uses a zero'ed state... */
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Memset(md->X, 0x0, sizeof(md->X));
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Memset(md->chksum, 0x0, sizeof(md->chksum));
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Memset(md->buf, 0x0, sizeof(md->buf));
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md->curlen = 0;
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}
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int32_t psMd2Update(psMd2_t *md, const unsigned char *buf, uint32_t len)
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{
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uint32_t n;
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# ifdef CRYPTO_ASSERT
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psAssert(md != NULL);
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psAssert(buf != NULL);
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if (md->curlen > sizeof(md->buf))
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{
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psTraceCrypto("psMd2Update error\n");
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return PS_LIMIT_FAIL;
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}
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# endif
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while (len > 0)
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{
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n = min(len, (16 - md->curlen));
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Memcpy(md->buf + md->curlen, buf, (size_t) n);
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md->curlen += n;
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buf += n;
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len -= n;
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/* is 16 bytes full? */
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if (md->curlen == 16)
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{
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md2_compress(md);
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md2_update_chksum(md);
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md->curlen = 0;
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}
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}
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return PS_SUCCESS;
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}
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int32_t psMd2Final(psMd2_t *md, unsigned char *hash)
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{
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uint32 i, k;
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# ifdef CRYPTO_ASSERT
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psAssert(md != NULL);
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psAssert(hash != NULL);
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# endif
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if (md->curlen >= sizeof(md->buf))
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{
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psTraceCrypto("psMd2Final error\n");
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return PS_LIMIT_FAIL;
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}
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/* pad the message */
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k = 16 - md->curlen;
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for (i = md->curlen; i < 16; i++)
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{
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md->buf[i] = (unsigned char) k;
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}
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/* hash and update */
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md2_compress(md);
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md2_update_chksum(md);
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/* hash checksum */
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Memcpy(md->buf, md->chksum, 16);
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md2_compress(md);
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/* output is lower 16 bytes of X */
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Memcpy(hash, md->X, 16);
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Memset(md, 0x0, sizeof(psMd2_t));
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return PS_SUCCESS;
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}
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#endif /* USE_MATRIX_MD2 */
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/******************************************************************************/
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