188 lines
6.1 KiB
C
188 lines
6.1 KiB
C
/* $NetBSD: md2c.c,v 1.3 2002/03/31 12:58:56 bjh21 Exp $ */
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/*
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* Copyright (c) 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Andrew Brown.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "namespace.h"
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#include <sys/types.h>
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#include <assert.h>
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#include <md2.h>
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#include <string.h>
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#if !HAVE_MD2_H
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/* cut-n-pasted from rfc1319 */
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static unsigned char 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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/* cut-n-pasted from rfc1319 */
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static unsigned char *pad[] = {
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(unsigned char *)"",
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(unsigned char *)"\001",
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(unsigned char *)"\002\002",
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(unsigned char *)"\003\003\003",
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(unsigned char *)"\004\004\004\004",
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(unsigned char *)"\005\005\005\005\005",
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(unsigned char *)"\006\006\006\006\006\006",
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(unsigned char *)"\007\007\007\007\007\007\007",
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(unsigned char *)"\010\010\010\010\010\010\010\010",
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(unsigned char *)"\011\011\011\011\011\011\011\011\011",
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(unsigned char *)"\012\012\012\012\012\012\012\012\012\012",
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(unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013",
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(unsigned char *)"\014\014\014\014\014\014\014\014\014\014\014\014",
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(unsigned char *)
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"\015\015\015\015\015\015\015\015\015\015\015\015\015",
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(unsigned char *)
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"\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
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(unsigned char *)
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"\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
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(unsigned char *)
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"\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"
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};
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static void MD2Transform __P((MD2_CTX *));
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#ifdef __weak_alias
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__weak_alias(MD2Init,_MD2Init)
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__weak_alias(MD2Update,_MD2Update)
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__weak_alias(MD2Final,_MD2Final)
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#endif
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void
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MD2Init(context)
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MD2_CTX *context;
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{
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_DIAGASSERT(context != 0);
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context->i = 16;
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memset(&context->C[0], 0, sizeof(context->C));
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memset(&context->X[0], 0, sizeof(context->X));
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}
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void
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MD2Update(context, input, inputLen)
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MD2_CTX *context;
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const unsigned char *input;
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unsigned int inputLen;
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{
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unsigned int idx, piece;
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_DIAGASSERT(context != 0);
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_DIAGASSERT(input != 0);
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for (idx = 0; idx < inputLen; idx += piece) {
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piece = 32 - context->i;
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if ((inputLen - idx) < piece)
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piece = inputLen - idx;
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memcpy(&context->X[context->i], &input[idx], (size_t)piece);
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if ((context->i += piece) == 32)
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MD2Transform(context); /* resets i */
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}
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}
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void
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MD2Final(digest, context)
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unsigned char digest[16]; /* message digest */
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MD2_CTX *context; /* context */
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{
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unsigned int padlen;
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_DIAGASSERT(digest != 0);
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_DIAGASSERT(context != 0);
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/* padlen should be 1..16 */
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padlen = 32 - context->i;
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/* add padding */
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MD2Update(context, pad[padlen], padlen);
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/* add checksum */
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MD2Update(context, &context->C[0], (unsigned int) sizeof(context->C));
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/* copy out final digest */
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memcpy(digest, &context->X[0], (size_t)16);
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/* reset the context */
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MD2Init(context);
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}
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static void
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MD2Transform(context)
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MD2_CTX *context;
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{
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u_int32_t l, j, k, t;
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/* set block "3" and update "checksum" */
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for (l = context->C[15], j = 0; j < 16; j++) {
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context->X[32 + j] = context->X[j] ^ context->X[16 + j];
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l = context->C[j] ^= S[context->X[16 + j] ^ l];
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}
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/* mangle input block */
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for (t = j = 0; j < 18; t = (t + j) % 256, j++)
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for (k = 0; k < 48; k++)
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t = context->X[k] = (context->X[k] ^ S[t]);
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/* reset input pointer */
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context->i = 16;
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}
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#endif /* !HAVE_MD2_H */
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