md2.c revision 1.1
1 /* $NetBSD: md2.c,v 1.1 2005/09/24 20:51:14 elad 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #if defined(LIBC_SCCS) && !defined(lint) 41 __RCSID("$NetBSD: md2.c,v 1.1 2005/09/24 20:51:14 elad Exp $"); 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include "namespace.h" 45 46 #include <sys/types.h> 47 48 #include <assert.h> 49 #include <md2.h> 50 #include <string.h> 51 52 #if HAVE_NBTOOL_CONFIG_H 53 #include "nbtool_config.h" 54 #endif 55 56 #if !HAVE_MD2_H 57 58 /* cut-n-pasted from rfc1319 */ 59 static unsigned char S[256] = { 60 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 61 19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 62 76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 63 138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 64 245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 65 148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 66 39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 67 181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 68 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 69 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 70 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 71 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 72 234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 73 129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 74 8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233, 75 203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228, 76 166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237, 77 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 78 }; 79 80 /* cut-n-pasted from rfc1319 */ 81 static unsigned char *pad[] = { 82 (unsigned char *)"", 83 (unsigned char *)"\001", 84 (unsigned char *)"\002\002", 85 (unsigned char *)"\003\003\003", 86 (unsigned char *)"\004\004\004\004", 87 (unsigned char *)"\005\005\005\005\005", 88 (unsigned char *)"\006\006\006\006\006\006", 89 (unsigned char *)"\007\007\007\007\007\007\007", 90 (unsigned char *)"\010\010\010\010\010\010\010\010", 91 (unsigned char *)"\011\011\011\011\011\011\011\011\011", 92 (unsigned char *)"\012\012\012\012\012\012\012\012\012\012", 93 (unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013", 94 (unsigned char *)"\014\014\014\014\014\014\014\014\014\014\014\014", 95 (unsigned char *) 96 "\015\015\015\015\015\015\015\015\015\015\015\015\015", 97 (unsigned char *) 98 "\016\016\016\016\016\016\016\016\016\016\016\016\016\016", 99 (unsigned char *) 100 "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017", 101 (unsigned char *) 102 "\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020" 103 }; 104 105 static void MD2Transform __P((MD2_CTX *)); 106 107 #ifdef __weak_alias 108 __weak_alias(MD2Init,_MD2Init) 109 __weak_alias(MD2Update,_MD2Update) 110 __weak_alias(MD2Final,_MD2Final) 111 #endif 112 113 void 114 MD2Init(context) 115 MD2_CTX *context; 116 { 117 _DIAGASSERT(context != 0); 118 119 context->i = 16; 120 memset(&context->C[0], 0, sizeof(context->C)); 121 memset(&context->X[0], 0, sizeof(context->X)); 122 } 123 124 void 125 MD2Update(context, input, inputLen) 126 MD2_CTX *context; 127 const unsigned char *input; 128 unsigned int inputLen; 129 { 130 unsigned int idx, piece; 131 132 _DIAGASSERT(context != 0); 133 _DIAGASSERT(input != 0); 134 135 for (idx = 0; idx < inputLen; idx += piece) { 136 piece = 32 - context->i; 137 if ((inputLen - idx) < piece) 138 piece = inputLen - idx; 139 memcpy(&context->X[context->i], &input[idx], (size_t)piece); 140 if ((context->i += piece) == 32) 141 MD2Transform(context); /* resets i */ 142 } 143 } 144 145 void 146 MD2Final(digest, context) 147 unsigned char digest[16]; /* message digest */ 148 MD2_CTX *context; /* context */ 149 { 150 unsigned int padlen; 151 152 _DIAGASSERT(digest != 0); 153 _DIAGASSERT(context != 0); 154 155 /* padlen should be 1..16 */ 156 padlen = 32 - context->i; 157 158 /* add padding */ 159 MD2Update(context, pad[padlen], padlen); 160 161 /* add checksum */ 162 MD2Update(context, &context->C[0], (unsigned int) sizeof(context->C)); 163 164 /* copy out final digest */ 165 memcpy(digest, &context->X[0], (size_t)16); 166 167 /* reset the context */ 168 MD2Init(context); 169 } 170 171 static void 172 MD2Transform(context) 173 MD2_CTX *context; 174 { 175 u_int32_t l, j, k, t; 176 177 /* set block "3" and update "checksum" */ 178 for (l = context->C[15], j = 0; j < 16; j++) { 179 context->X[32 + j] = context->X[j] ^ context->X[16 + j]; 180 l = context->C[j] ^= S[context->X[16 + j] ^ l]; 181 } 182 183 /* mangle input block */ 184 for (t = j = 0; j < 18; t = (t + j) % 256, j++) 185 for (k = 0; k < 48; k++) 186 t = context->X[k] = (context->X[k] ^ S[t]); 187 188 /* reset input pointer */ 189 context->i = 16; 190 } 191 192 #endif /* !HAVE_MD2_H */ 193
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