ping6.tproj/md5.c

   1 /*      $KAME: md5.c,v 1.3 2000/05/27 07:14:22 itojun Exp $     */
   2
   3 /*
   4  * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the project nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/param.h>
  33 #include <sys/types.h>
  34 #include <sys/cdefs.h>
  35 #include <sys/time.h>
  36 #include <string.h>
  37 #include "md5.h"
  38
  39 #define SHIFT(X, s) (((X) << (s)) | ((X) >> (32 - (s))))
  40
  41 #define F(X, Y, Z) (((X) & (Y)) | ((~X) & (Z)))
  42 #define G(X, Y, Z) (((X) & (Z)) | ((Y) & (~Z)))
  43 #define H(X, Y, Z) ((X) ^ (Y) ^ (Z))
  44 #define I(X, Y, Z) ((Y) ^ ((X) | (~Z)))
  45
  46 #define ROUND1(a, b, c, d, k, s, i) { \
  47         (a) = (a) + F((b), (c), (d)) + X[(k)] + T[(i)]; \
  48         (a) = SHIFT((a), (s)); \
  49         (a) = (b) + (a); \
  50 }
  51
  52 #define ROUND2(a, b, c, d, k, s, i) { \
  53         (a) = (a) + G((b), (c), (d)) + X[(k)] + T[(i)]; \
  54         (a) = SHIFT((a), (s)); \
  55         (a) = (b) + (a); \
  56 }
  57
  58 #define ROUND3(a, b, c, d, k, s, i) { \
  59         (a) = (a) + H((b), (c), (d)) + X[(k)] + T[(i)]; \
  60         (a) = SHIFT((a), (s)); \
  61         (a) = (b) + (a); \
  62 }
  63
  64 #define ROUND4(a, b, c, d, k, s, i) { \
  65         (a) = (a) + I((b), (c), (d)) + X[(k)] + T[(i)]; \
  66         (a) = SHIFT((a), (s)); \
  67         (a) = (b) + (a); \
  68 }
  69
  70 #define Sa       7
  71 #define Sb      12
  72 #define Sc      17
  73 #define Sd      22
  74
  75 #define Se       5
  76 #define Sf       9
  77 #define Sg      14
  78 #define Sh      20
  79
  80 #define Si       4
  81 #define Sj      11
  82 #define Sk      16
  83 #define Sl      23
  84
  85 #define Sm       6
  86 #define Sn      10
  87 #define So      15
  88 #define Sp      21
  89
  90 #define MD5_A0  0x67452301
  91 #define MD5_B0  0xefcdab89
  92 #define MD5_C0  0x98badcfe
  93 #define MD5_D0  0x10325476
  94
  95 /* Integer part of 4294967296 times abs(sin(i)), where i is in radians. */
  96 static const u_int32_t T[65] = {
  97         0,
  98         0xd76aa478,     0xe8c7b756,     0x242070db,     0xc1bdceee,
  99         0xf57c0faf,     0x4787c62a,     0xa8304613,     0xfd469501,
 100         0x698098d8,     0x8b44f7af,     0xffff5bb1,     0x895cd7be,
 101         0x6b901122,     0xfd987193,     0xa679438e,     0x49b40821,
 102
 103         0xf61e2562,     0xc040b340,     0x265e5a51,     0xe9b6c7aa,
 104         0xd62f105d,     0x2441453,      0xd8a1e681,     0xe7d3fbc8,
 105         0x21e1cde6,     0xc33707d6,     0xf4d50d87,     0x455a14ed,
 106         0xa9e3e905,     0xfcefa3f8,     0x676f02d9,     0x8d2a4c8a,
 107
 108         0xfffa3942,     0x8771f681,     0x6d9d6122,     0xfde5380c,
 109         0xa4beea44,     0x4bdecfa9,     0xf6bb4b60,     0xbebfbc70,
 110         0x289b7ec6,     0xeaa127fa,     0xd4ef3085,     0x4881d05,
 111         0xd9d4d039,     0xe6db99e5,     0x1fa27cf8,     0xc4ac5665,
 112
 113         0xf4292244,     0x432aff97,     0xab9423a7,     0xfc93a039,
 114         0x655b59c3,     0x8f0ccc92,     0xffeff47d,     0x85845dd1,
 115         0x6fa87e4f,     0xfe2ce6e0,     0xa3014314,     0x4e0811a1,
 116         0xf7537e82,     0xbd3af235,     0x2ad7d2bb,     0xeb86d391,
 117 };
 118
 119 static const u_int8_t md5_paddat[MD5_BUFLEN] = {
 120         0x80,   0,      0,      0,      0,      0,      0,      0,
 121         0,      0,      0,      0,      0,      0,      0,      0,
 122         0,      0,      0,      0,      0,      0,      0,      0,
 123         0,      0,      0,      0,      0,      0,      0,      0,
 124         0,      0,      0,      0,      0,      0,      0,      0,
 125         0,      0,      0,      0,      0,      0,      0,      0,
 126         0,      0,      0,      0,      0,      0,      0,      0,
 127         0,      0,      0,      0,      0,      0,      0,      0,
 128 };
 129
 130 static void md5_calc __P((u_int8_t *, md5_ctxt *));
 131
 132 void md5_init(ctxt)
 133         md5_ctxt *ctxt;
 134 {
 135         ctxt->md5_n = 0;
 136         ctxt->md5_i = 0;
 137         ctxt->md5_sta = MD5_A0;
 138         ctxt->md5_stb = MD5_B0;
 139         ctxt->md5_stc = MD5_C0;
 140         ctxt->md5_std = MD5_D0;
 141         bzero(ctxt->md5_buf, sizeof(ctxt->md5_buf));
 142 }
 143
 144 void md5_loop(ctxt, input, len)
 145         md5_ctxt *ctxt;
 146         u_int8_t *input;
 147         u_int len; /* number of bytes */
 148 {
 149         u_int gap, i;
 150
 151         ctxt->md5_n += len * 8; /* byte to bit */
 152         gap = MD5_BUFLEN - ctxt->md5_i;
 153
 154         if (len >= gap) {
 155                 bcopy((void *)input, (void *)(ctxt->md5_buf + ctxt->md5_i),
 156                         gap);
 157                 md5_calc(ctxt->md5_buf, ctxt);
 158
 159                 for (i = gap; i + MD5_BUFLEN <= len; i += MD5_BUFLEN) {
 160                         md5_calc((u_int8_t *)(input + i), ctxt);
 161                 }
 162
 163                 ctxt->md5_i = len - i;
 164                 bcopy((void *)(input + i), (void *)ctxt->md5_buf, ctxt->md5_i);
 165         } else {
 166                 bcopy((void *)input, (void *)(ctxt->md5_buf + ctxt->md5_i),
 167                         len);
 168                 ctxt->md5_i += len;
 169         }
 170 }
 171
 172 void md5_pad(ctxt)
 173         md5_ctxt *ctxt;
 174 {
 175         u_int gap;
 176
 177         /* Don't count up padding. Keep md5_n. */
 178         gap = MD5_BUFLEN - ctxt->md5_i;
 179         if (gap > 8) {
 180                 bcopy((void *)md5_paddat,
 181                       (void *)(ctxt->md5_buf + ctxt->md5_i),
 182                       gap - sizeof(ctxt->md5_n));
 183         } else {
 184                 /* including gap == 8 */
 185                 bcopy((void *)md5_paddat, (void *)(ctxt->md5_buf + ctxt->md5_i),
 186                         gap);
 187                 md5_calc(ctxt->md5_buf, ctxt);
 188                 bcopy((void *)(md5_paddat + gap),
 189                       (void *)ctxt->md5_buf,
 190                       MD5_BUFLEN - sizeof(ctxt->md5_n));
 191         }
 192
 193         /* 8 byte word */
 194 #if BYTE_ORDER == LITTLE_ENDIAN
 195         bcopy(&ctxt->md5_n8[0], &ctxt->md5_buf[56], 8);
 196 #endif
 197 #if BYTE_ORDER == BIG_ENDIAN
 198         ctxt->md5_buf[56] = ctxt->md5_n8[7];
 199         ctxt->md5_buf[57] = ctxt->md5_n8[6];
 200         ctxt->md5_buf[58] = ctxt->md5_n8[5];
 201         ctxt->md5_buf[59] = ctxt->md5_n8[4];
 202         ctxt->md5_buf[60] = ctxt->md5_n8[3];
 203         ctxt->md5_buf[61] = ctxt->md5_n8[2];
 204         ctxt->md5_buf[62] = ctxt->md5_n8[1];
 205         ctxt->md5_buf[63] = ctxt->md5_n8[0];
 206 #endif
 207
 208         md5_calc(ctxt->md5_buf, ctxt);
 209 }
 210
 211 void md5_result(digest, ctxt)
 212         u_int8_t *digest;
 213         md5_ctxt *ctxt;
 214 {
 215         /* 4 byte words */
 216 #if BYTE_ORDER == LITTLE_ENDIAN
 217         bcopy(&ctxt->md5_st8[0], digest, 16);
 218 #endif
 219 #if BYTE_ORDER == BIG_ENDIAN
 220         digest[ 0] = ctxt->md5_st8[ 3]; digest[ 1] = ctxt->md5_st8[ 2];
 221         digest[ 2] = ctxt->md5_st8[ 1]; digest[ 3] = ctxt->md5_st8[ 0];
 222         digest[ 4] = ctxt->md5_st8[ 7]; digest[ 5] = ctxt->md5_st8[ 6];
 223         digest[ 6] = ctxt->md5_st8[ 5]; digest[ 7] = ctxt->md5_st8[ 4];
 224         digest[ 8] = ctxt->md5_st8[11]; digest[ 9] = ctxt->md5_st8[10];
 225         digest[10] = ctxt->md5_st8[ 9]; digest[11] = ctxt->md5_st8[ 8];
 226         digest[12] = ctxt->md5_st8[15]; digest[13] = ctxt->md5_st8[14];
 227         digest[14] = ctxt->md5_st8[13]; digest[15] = ctxt->md5_st8[12];
 228 #endif
 229 }
 230
 231 #if BYTE_ORDER == BIG_ENDIAN
 232 u_int32_t X[16];
 233 #endif
 234
 235 static void md5_calc(b64, ctxt)
 236         u_int8_t *b64;
 237         md5_ctxt *ctxt;
 238 {
 239         u_int32_t A = ctxt->md5_sta;
 240         u_int32_t B = ctxt->md5_stb;
 241         u_int32_t C = ctxt->md5_stc;
 242         u_int32_t D = ctxt->md5_std;
 243 #if BYTE_ORDER == LITTLE_ENDIAN
 244         u_int32_t *X = (u_int32_t *)b64;
 245 #endif
 246 #if BYTE_ORDER == BIG_ENDIAN
 247         /* 4 byte words */
 248         /* what a brute force but fast! */
 249         u_int8_t *y = (u_int8_t *)X;
 250         y[ 0] = b64[ 3]; y[ 1] = b64[ 2]; y[ 2] = b64[ 1]; y[ 3] = b64[ 0];
 251         y[ 4] = b64[ 7]; y[ 5] = b64[ 6]; y[ 6] = b64[ 5]; y[ 7] = b64[ 4];
 252         y[ 8] = b64[11]; y[ 9] = b64[10]; y[10] = b64[ 9]; y[11] = b64[ 8];
 253         y[12] = b64[15]; y[13] = b64[14]; y[14] = b64[13]; y[15] = b64[12];
 254         y[16] = b64[19]; y[17] = b64[18]; y[18] = b64[17]; y[19] = b64[16];
 255         y[20] = b64[23]; y[21] = b64[22]; y[22] = b64[21]; y[23] = b64[20];
 256         y[24] = b64[27]; y[25] = b64[26]; y[26] = b64[25]; y[27] = b64[24];
 257         y[28] = b64[31]; y[29] = b64[30]; y[30] = b64[29]; y[31] = b64[28];
 258         y[32] = b64[35]; y[33] = b64[34]; y[34] = b64[33]; y[35] = b64[32];
 259         y[36] = b64[39]; y[37] = b64[38]; y[38] = b64[37]; y[39] = b64[36];
 260         y[40] = b64[43]; y[41] = b64[42]; y[42] = b64[41]; y[43] = b64[40];
 261         y[44] = b64[47]; y[45] = b64[46]; y[46] = b64[45]; y[47] = b64[44];
 262         y[48] = b64[51]; y[49] = b64[50]; y[50] = b64[49]; y[51] = b64[48];
 263         y[52] = b64[55]; y[53] = b64[54]; y[54] = b64[53]; y[55] = b64[52];
 264         y[56] = b64[59]; y[57] = b64[58]; y[58] = b64[57]; y[59] = b64[56];
 265         y[60] = b64[63]; y[61] = b64[62]; y[62] = b64[61]; y[63] = b64[60];
 266 #endif
 267
 268         ROUND1(A, B, C, D,  0, Sa,  1); ROUND1(D, A, B, C,  1, Sb,  2);
 269         ROUND1(C, D, A, B,  2, Sc,  3); ROUND1(B, C, D, A,  3, Sd,  4);
 270         ROUND1(A, B, C, D,  4, Sa,  5); ROUND1(D, A, B, C,  5, Sb,  6);
 271         ROUND1(C, D, A, B,  6, Sc,  7); ROUND1(B, C, D, A,  7, Sd,  8);
 272         ROUND1(A, B, C, D,  8, Sa,  9); ROUND1(D, A, B, C,  9, Sb, 10);
 273         ROUND1(C, D, A, B, 10, Sc, 11); ROUND1(B, C, D, A, 11, Sd, 12);
 274         ROUND1(A, B, C, D, 12, Sa, 13); ROUND1(D, A, B, C, 13, Sb, 14);
 275         ROUND1(C, D, A, B, 14, Sc, 15); ROUND1(B, C, D, A, 15, Sd, 16);
 276
 277         ROUND2(A, B, C, D,  1, Se, 17); ROUND2(D, A, B, C,  6, Sf, 18);
 278         ROUND2(C, D, A, B, 11, Sg, 19); ROUND2(B, C, D, A,  0, Sh, 20);
 279         ROUND2(A, B, C, D,  5, Se, 21); ROUND2(D, A, B, C, 10, Sf, 22);
 280         ROUND2(C, D, A, B, 15, Sg, 23); ROUND2(B, C, D, A,  4, Sh, 24);
 281         ROUND2(A, B, C, D,  9, Se, 25); ROUND2(D, A, B, C, 14, Sf, 26);
 282         ROUND2(C, D, A, B,  3, Sg, 27); ROUND2(B, C, D, A,  8, Sh, 28);
 283         ROUND2(A, B, C, D, 13, Se, 29); ROUND2(D, A, B, C,  2, Sf, 30);
 284         ROUND2(C, D, A, B,  7, Sg, 31); ROUND2(B, C, D, A, 12, Sh, 32);
 285
 286         ROUND3(A, B, C, D,  5, Si, 33); ROUND3(D, A, B, C,  8, Sj, 34);
 287         ROUND3(C, D, A, B, 11, Sk, 35); ROUND3(B, C, D, A, 14, Sl, 36);
 288         ROUND3(A, B, C, D,  1, Si, 37); ROUND3(D, A, B, C,  4, Sj, 38);
 289         ROUND3(C, D, A, B,  7, Sk, 39); ROUND3(B, C, D, A, 10, Sl, 40);
 290         ROUND3(A, B, C, D, 13, Si, 41); ROUND3(D, A, B, C,  0, Sj, 42);
 291         ROUND3(C, D, A, B,  3, Sk, 43); ROUND3(B, C, D, A,  6, Sl, 44);
 292         ROUND3(A, B, C, D,  9, Si, 45); ROUND3(D, A, B, C, 12, Sj, 46);
 293         ROUND3(C, D, A, B, 15, Sk, 47); ROUND3(B, C, D, A,  2, Sl, 48);
 294
 295         ROUND4(A, B, C, D,  0, Sm, 49); ROUND4(D, A, B, C,  7, Sn, 50);
 296         ROUND4(C, D, A, B, 14, So, 51); ROUND4(B, C, D, A,  5, Sp, 52);
 297         ROUND4(A, B, C, D, 12, Sm, 53); ROUND4(D, A, B, C,  3, Sn, 54);
 298         ROUND4(C, D, A, B, 10, So, 55); ROUND4(B, C, D, A,  1, Sp, 56);
 299         ROUND4(A, B, C, D,  8, Sm, 57); ROUND4(D, A, B, C, 15, Sn, 58);
 300         ROUND4(C, D, A, B,  6, So, 59); ROUND4(B, C, D, A, 13, Sp, 60);
 301         ROUND4(A, B, C, D,  4, Sm, 61); ROUND4(D, A, B, C, 11, Sn, 62);
 302         ROUND4(C, D, A, B,  2, So, 63); ROUND4(B, C, D, A,  9, Sp, 64);
 303
 304         ctxt->md5_sta += A;
 305         ctxt->md5_stb += B;
 306         ctxt->md5_stc += C;
 307         ctxt->md5_std += D;
 308 }