lib/libc/hash/md2/md2.c

   1 /*      $NetBSD: md2.c,v 1.4 2006/05/12 02:49:00 mrg Exp $      */
   2
   3 /*
   4  * Copyright (c) 2001 The NetBSD Foundation, Inc.
   5  * All rights reserved.
   6  *
   7  * This code is derived from software contributed to The NetBSD Foundation
   8  * by Andrew Brown.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
  23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  29  * POSSIBILITY OF SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 __RCSID("$NetBSD: md2.c,v 1.4 2006/05/12 02:49:00 mrg Exp $");
  35 #endif /* LIBC_SCCS and not lint */
  36
  37 #include "namespace.h"
  38
  39 #include <sys/types.h>
  40
  41 #include <assert.h>
  42 #include <md2.h>
  43 #include <string.h>
  44
  45 #if HAVE_NBTOOL_CONFIG_H
  46 #include "nbtool_config.h"
  47 #endif
  48
  49 #if !HAVE_MD2_H
  50
  51 /* cut-n-pasted from rfc1319 */
  52 static unsigned char S[256] = {
  53         41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
  54         19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
  55         76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
  56         138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
  57         245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
  58         148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
  59         39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
  60         181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
  61         150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
  62         112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
  63         96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
  64         85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
  65         234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
  66         129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
  67         8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
  68         203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
  69         166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
  70         31, 26, 219, 153, 141, 51, 159, 17, 131, 20
  71 };
  72
  73 /* cut-n-pasted from rfc1319 */
  74 static const unsigned char *pad[] = {
  75         (const unsigned char *)"",
  76         (const unsigned char *)"\001",
  77         (const unsigned char *)"\002\002",
  78         (const unsigned char *)"\003\003\003",
  79         (const unsigned char *)"\004\004\004\004",
  80         (const unsigned char *)"\005\005\005\005\005",
  81         (const unsigned char *)"\006\006\006\006\006\006",
  82         (const unsigned char *)"\007\007\007\007\007\007\007",
  83         (const unsigned char *)"\010\010\010\010\010\010\010\010",
  84         (const unsigned char *)"\011\011\011\011\011\011\011\011\011",
  85         (const unsigned char *)"\012\012\012\012\012\012\012\012\012\012",
  86         (const unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013",
  87         (const unsigned char *)
  88         "\014\014\014\014\014\014\014\014\014\014\014\014",
  89         (const unsigned char *)
  90         "\015\015\015\015\015\015\015\015\015\015\015\015\015",
  91         (const unsigned char *)
  92         "\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
  93         (const unsigned char *)
  94         "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
  95         (const unsigned char *)
  96         "\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"
  97 };
  98
  99 /*
 100  * XXX This should not be visible, but due to an accident, it is
 101  * XXX so it must remain so.
 102  */
 103 /*static*/ void MD2Transform __P((MD2_CTX *));
 104
 105 #ifdef __weak_alias
 106 __weak_alias(MD2Init,_MD2Init)
 107 __weak_alias(MD2Update,_MD2Update)
 108 __weak_alias(MD2Final,_MD2Final)
 109 __weak_alias(MD2Transform,_MD2Transform)
 110 #endif
 111
 112 void
 113 MD2Init(context)
 114         MD2_CTX *context;
 115 {
 116         _DIAGASSERT(context != 0);
 117
 118         context->i = 16;
 119         memset(&context->C[0], 0, sizeof(context->C));
 120         memset(&context->X[0], 0, sizeof(context->X));
 121 }
 122
 123 void
 124 MD2Update(context, input, inputLen)
 125         MD2_CTX *context;
 126         const unsigned char *input;
 127         unsigned int inputLen;
 128 {
 129         unsigned int idx, piece;
 130
 131         _DIAGASSERT(context != 0);
 132         _DIAGASSERT(input != 0);
 133
 134         for (idx = 0; idx < inputLen; idx += piece) {
 135                 piece = 32 - context->i;
 136                 if ((inputLen - idx) < piece)
 137                         piece = inputLen - idx;
 138                 memcpy(&context->X[context->i], &input[idx], (size_t)piece);
 139                 if ((context->i += piece) == 32)
 140                         MD2Transform(context); /* resets i */
 141         }
 142 }
 143
 144 void
 145 MD2Final(digest, context)
 146         unsigned char digest[16];       /* message digest */
 147         MD2_CTX *context;               /* context */
 148 {
 149         unsigned int padlen;
 150
 151         _DIAGASSERT(digest != 0);
 152         _DIAGASSERT(context != 0);
 153
 154         /* padlen should be 1..16 */
 155         padlen = 32 - context->i;
 156
 157         /* add padding */
 158         MD2Update(context, pad[padlen], padlen);
 159
 160         /* add checksum */
 161         MD2Update(context, &context->C[0], (unsigned int) sizeof(context->C));
 162
 163         /* copy out final digest */
 164         memcpy(digest, &context->X[0], (size_t)16);
 165
 166         /* reset the context */
 167         MD2Init(context);
 168 }
 169
 170 /*static*/ void
 171 MD2Transform(context)
 172         MD2_CTX *context;
 173 {
 174         u_int32_t l, j, k, t;
 175
 176         /* set block "3" and update "checksum" */
 177         for (l = context->C[15], j = 0; j < 16; j++) {
 178                 context->X[32 + j] = context->X[j] ^ context->X[16 + j];
 179                 l = context->C[j] ^= S[context->X[16 + j] ^ l];
 180         }
 181
 182         /* mangle input block */
 183         for (t = j = 0; j < 18; t = (t + j) % 256, j++)
 184                 for (k = 0; k < 48; k++)
 185                         t = context->X[k] = (context->X[k] ^ S[t]);
 186
 187         /* reset input pointer */
 188         context->i = 16;
 189 }
 190
 191 #endif /* !HAVE_MD2_H */