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biosvos
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/* md2.c
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*
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* The MD2 hash function, described in RFC 1319.
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*
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* This code was originally written by Möller/Sigfridsson for
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* libnettle. It was altered by B. Poettering to fit the mhash
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* interface. The original copyright notice follows.
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*/
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/* nettle, low-level cryptographics library
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*
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* Copyright (C) 2003 Niels Möller, Andreas Sigfridsson
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*
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* The nettle library 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 published by
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* the Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* The nettle library is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
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* License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with the nettle library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
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* MA 02111-1307, USA.
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*/
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/* This code originates from the Python Cryptography Toolkit, version 1.0.1.
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Further hacked by Andreas Sigfridsson and Niels Möller. Original license:
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===================================================================
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Distribute and use freely; there are no restrictions on further
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dissemination and usage except those imposed by the laws of your
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country of residence. This software is provided "as is" without
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warranty of fitness for use or suitability for any purpose, express
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or implied. Use at your own risk or not at all.
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===================================================================
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Incorporating the code into commercial products is permitted; you do
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not have to make source available or contribute your changes back
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(though that would be nice).
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--amk (www.amk.ca) */
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#include "libdefs.h"
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#ifdef ENABLE_MD2
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#include "mhash_md2.h"
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static __const mutils_word8
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S[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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static void
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md2_transform(struct md2_ctx *ctx, __const mutils_word8 *data)
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{
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mutils_word8 i;
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mutils_word8 j;
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mutils_word8 t;
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mutils_memcpy(ctx->X + 16, data, MD2_DATA_SIZE);
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for (i = 0, t = ctx->C[15]; i<MD2_DATA_SIZE; i++)
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{
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ctx->X[2 * MD2_DATA_SIZE + i]
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= ctx->X[i] ^ ctx->X[MD2_DATA_SIZE + i];
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t = (ctx->C[i] ^= S[data[i]^t]);
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}
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for (i = t = 0; i< MD2_DATA_SIZE + 2; t = (t + i) & 0xff, i++)
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{
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for (j = 0; j < 3 * MD2_DATA_SIZE; j++)
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t = (ctx->X[j] ^= S[t]);
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}
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}
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void
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md2_init(struct md2_ctx *ctx)
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{
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mutils_bzero(ctx, sizeof(*ctx));
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}
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void
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md2_update(struct md2_ctx *ctx,
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__const mutils_word8 *data,
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mutils_word32 length)
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{
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if (ctx->index != 0)
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{
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/* Try to fill partial block */
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mutils_word32 left = MD2_DATA_SIZE - ctx->index;
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if (length < left)
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{
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mutils_memcpy(ctx->buffer + ctx->index, data, length);
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ctx->index += length;
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return; /* Finished */
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}
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else
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{
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mutils_memcpy(ctx->buffer + ctx->index, data, left);
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md2_transform(ctx, ctx->buffer);
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data += left;
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length -= left;
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}
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}
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while (length >= MD2_DATA_SIZE)
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{
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md2_transform(ctx, data);
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data += MD2_DATA_SIZE;
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length -= MD2_DATA_SIZE;
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}
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if ((ctx->index = length) != 0) /* This assignment is intended */
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/* Buffer leftovers */
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mutils_memcpy(ctx->buffer, data, length);
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}
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void
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md2_digest(struct md2_ctx *ctx, mutils_word8 *digest)
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{
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mutils_word8 left;
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left = MD2_DATA_SIZE - ctx->index;
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mutils_memset(ctx->buffer + ctx->index, left, left);
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md2_transform(ctx, ctx->buffer);
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md2_transform(ctx, ctx->C);
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mutils_memcpy(digest, ctx->X, MD2_DIGEST_SIZE);
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md2_init(ctx);
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}
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#endif /* ENABLE_MD2 */
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