src/3rdparty/md5/md5.cpp

   1 /* $Id$ */
   2
   3 /** @file md5.cpp Creating MD5 checksums of files. */
   4
   5 /*
   6   Copyright (C) 1999, 2000, 2002 Aladdin Enterprises.  All rights reserved.
   7
   8   This software is provided 'as-is', without any express or implied
   9   warranty.  In no event will the authors be held liable for any damages
  10   arising from the use of this software.
  11
  12   Permission is granted to anyone to use this software for any purpose,
  13   including commercial applications, and to alter it and redistribute it
  14   freely, subject to the following restrictions:
  15
  16   1. The origin of this software must not be misrepresented; you must not
  17      claim that you wrote the original software. If you use this software
  18      in a product, an acknowledgment in the product documentation would be
  19      appreciated but is not required.
  20   2. Altered source versions must be plainly marked as such, and must not be
  21      misrepresented as being the original software.
  22   3. This notice may not be removed or altered from any source distribution.
  23
  24   L. Peter Deutsch
  25   ghost@aladdin.com
  26
  27  */
  28
  29 /*
  30   Independent implementation of MD5 (RFC 1321).
  31
  32   This code implements the MD5 Algorithm defined in RFC 1321, whose
  33   text is available at
  34   http://www.ietf.org/rfc/rfc1321.txt
  35   The code is derived from the text of the RFC, including the test suite
  36   (section A.5) but excluding the rest of Appendix A.  It does not include
  37   any code or documentation that is identified in the RFC as being
  38   copyrighted.
  39
  40   The original and principal author of md5.c is L. Peter Deutsch
  41   <ghost@aladdin.com>.  Other authors are noted in the change history
  42   that follows (in reverse chronological order):
  43
  44   2007-12-24 Changed to C++ and adapted to OpenTTD source
  45   2002-04-13 lpd Clarified derivation from RFC 1321; now handles byte order
  46              either statically or dynamically; added missing #include <string.h>
  47              in library.
  48   2002-03-11 lpd Corrected argument list for main(), and added int return
  49              type, in test program and T value program.
  50   2002-02-21 lpd Added missing #include <stdio.h> in test program.
  51   2000-07-03 lpd Patched to eliminate warnings about "constant is
  52              unsigned in ANSI C, signed in traditional"; made test program
  53              self-checking.
  54   1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
  55   1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
  56   1999-05-03 lpd Original version.
  57  */
  58
  59 #include "../../stdafx.h"
  60 #include "../../core/endian_func.hpp"
  61 #include "md5.h"
  62
  63 #include "../../safeguards.h"
  64
  65 #define T_MASK ((uint32)~0)
  66 #define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
  67 #define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
  68 #define T3    0x242070db
  69 #define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
  70 #define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
  71 #define T6    0x4787c62a
  72 #define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
  73 #define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
  74 #define T9    0x698098d8
  75 #define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
  76 #define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
  77 #define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
  78 #define T13    0x6b901122
  79 #define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
  80 #define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
  81 #define T16    0x49b40821
  82 #define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
  83 #define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
  84 #define T19    0x265e5a51
  85 #define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
  86 #define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
  87 #define T22    0x02441453
  88 #define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
  89 #define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
  90 #define T25    0x21e1cde6
  91 #define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
  92 #define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
  93 #define T28    0x455a14ed
  94 #define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
  95 #define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
  96 #define T31    0x676f02d9
  97 #define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
  98 #define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
  99 #define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
 100 #define T35    0x6d9d6122
 101 #define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
 102 #define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
 103 #define T38    0x4bdecfa9
 104 #define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
 105 #define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
 106 #define T41    0x289b7ec6
 107 #define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
 108 #define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
 109 #define T44    0x04881d05
 110 #define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
 111 #define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
 112 #define T47    0x1fa27cf8
 113 #define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
 114 #define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
 115 #define T50    0x432aff97
 116 #define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
 117 #define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
 118 #define T53    0x655b59c3
 119 #define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
 120 #define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
 121 #define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
 122 #define T57    0x6fa87e4f
 123 #define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
 124 #define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
 125 #define T60    0x4e0811a1
 126 #define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
 127 #define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
 128 #define T63    0x2ad7d2bb
 129 #define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)
 130
 131 static inline void Md5Set1(const uint32 *X, uint32 *a, const uint32 *b, const uint32 *c, const uint32 *d, const uint8 k, const uint8 s, const uint32 Ti)
 132 {
 133         uint32 t = (*b & *c) | (~*b & *d);
 134         t += *a + X[k] + Ti;
 135         *a = ROL(t, s) + *b;
 136 }
 137
 138 static inline void Md5Set2(const uint32 *X, uint32 *a, const uint32 *b, const uint32 *c, const uint32 *d, const uint8 k, const uint8 s, const uint32 Ti)
 139 {
 140         uint32 t = (*b & *d) | (*c & ~*d);
 141         t += *a + X[k] + Ti;
 142         *a = ROL(t, s) + *b;
 143 }
 144
 145
 146 static inline void Md5Set3(const uint32 *X, uint32 *a, const uint32 *b, const uint32 *c, const uint32 *d, const uint8 k, const uint8 s, const uint32 Ti)
 147 {
 148         uint32 t = *b ^ *c ^ *d;
 149         t += *a + X[k] + Ti;
 150         *a = ROL(t, s) + *b;
 151 }
 152
 153 static inline void Md5Set4(const uint32 *X, uint32 *a, const uint32 *b, const uint32 *c, const uint32 *d, const uint8 k, const uint8 s, const uint32 Ti)
 154 {
 155         uint32 t = *c ^ (*b | ~*d);
 156         t += *a + X[k] + Ti;
 157         *a = ROL(t, s) + *b;
 158 }
 159
 160 Md5::Md5()
 161 {
 162         count[0] = 0;
 163         count[1] = 0;
 164         abcd[0] = 0x67452301;
 165         abcd[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
 166         abcd[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
 167         abcd[3] = 0x10325476;
 168 }
 169
 170 void Md5::Process(const uint8 *data /*[64]*/)
 171 {
 172         uint32 a = this->abcd[0];
 173         uint32 b = this->abcd[1];
 174         uint32 c = this->abcd[2];
 175         uint32 d = this->abcd[3];
 176
 177         uint32 X[16];
 178
 179         /* Convert the uint8 data to uint32 LE */
 180         const uint32 *px = (const uint32 *)data;
 181         for (uint i = 0; i < 16; i++) {
 182                 X[i] = TO_LE32(*px);
 183                 px++;
 184         }
 185
 186         /* Round 1. */
 187         Md5Set1(X, &a, &b, &c, &d,  0,  7,  T1);
 188         Md5Set1(X, &d, &a, &b, &c,  1, 12,  T2);
 189         Md5Set1(X, &c, &d, &a, &b,  2, 17,  T3);
 190         Md5Set1(X, &b, &c, &d, &a,  3, 22,  T4);
 191         Md5Set1(X, &a, &b, &c, &d,  4,  7,  T5);
 192         Md5Set1(X, &d, &a, &b, &c,  5, 12,  T6);
 193         Md5Set1(X, &c, &d, &a, &b,  6, 17,  T7);
 194         Md5Set1(X, &b, &c, &d, &a,  7, 22,  T8);
 195         Md5Set1(X, &a, &b, &c, &d,  8,  7,  T9);
 196         Md5Set1(X, &d, &a, &b, &c,  9, 12, T10);
 197         Md5Set1(X, &c, &d, &a, &b, 10, 17, T11);
 198         Md5Set1(X, &b, &c, &d, &a, 11, 22, T12);
 199         Md5Set1(X, &a, &b, &c, &d, 12,  7, T13);
 200         Md5Set1(X, &d, &a, &b, &c, 13, 12, T14);
 201         Md5Set1(X, &c, &d, &a, &b, 14, 17, T15);
 202         Md5Set1(X, &b, &c, &d, &a, 15, 22, T16);
 203
 204         /* Round 2. */
 205         Md5Set2(X, &a, &b, &c, &d,  1,  5, T17);
 206         Md5Set2(X, &d, &a, &b, &c,  6,  9, T18);
 207         Md5Set2(X, &c, &d, &a, &b, 11, 14, T19);
 208         Md5Set2(X, &b, &c, &d, &a,  0, 20, T20);
 209         Md5Set2(X, &a, &b, &c, &d,  5,  5, T21);
 210         Md5Set2(X, &d, &a, &b, &c, 10,  9, T22);
 211         Md5Set2(X, &c, &d, &a, &b, 15, 14, T23);
 212         Md5Set2(X, &b, &c, &d, &a,  4, 20, T24);
 213         Md5Set2(X, &a, &b, &c, &d,  9,  5, T25);
 214         Md5Set2(X, &d, &a, &b, &c, 14,  9, T26);
 215         Md5Set2(X, &c, &d, &a, &b,  3, 14, T27);
 216         Md5Set2(X, &b, &c, &d, &a,  8, 20, T28);
 217         Md5Set2(X, &a, &b, &c, &d, 13,  5, T29);
 218         Md5Set2(X, &d, &a, &b, &c,  2,  9, T30);
 219         Md5Set2(X, &c, &d, &a, &b,  7, 14, T31);
 220         Md5Set2(X, &b, &c, &d, &a, 12, 20, T32);
 221
 222         /* Round 3. */
 223         Md5Set3(X, &a, &b, &c, &d,  5,  4, T33);
 224         Md5Set3(X, &d, &a, &b, &c,  8, 11, T34);
 225         Md5Set3(X, &c, &d, &a, &b, 11, 16, T35);
 226         Md5Set3(X, &b, &c, &d, &a, 14, 23, T36);
 227         Md5Set3(X, &a, &b, &c, &d,  1,  4, T37);
 228         Md5Set3(X, &d, &a, &b, &c,  4, 11, T38);
 229         Md5Set3(X, &c, &d, &a, &b,  7, 16, T39);
 230         Md5Set3(X, &b, &c, &d, &a, 10, 23, T40);
 231         Md5Set3(X, &a, &b, &c, &d, 13,  4, T41);
 232         Md5Set3(X, &d, &a, &b, &c,  0, 11, T42);
 233         Md5Set3(X, &c, &d, &a, &b,  3, 16, T43);
 234         Md5Set3(X, &b, &c, &d, &a,  6, 23, T44);
 235         Md5Set3(X, &a, &b, &c, &d,  9,  4, T45);
 236         Md5Set3(X, &d, &a, &b, &c, 12, 11, T46);
 237         Md5Set3(X, &c, &d, &a, &b, 15, 16, T47);
 238         Md5Set3(X, &b, &c, &d, &a,  2, 23, T48);
 239
 240         /* Round 4. */
 241         Md5Set4(X, &a, &b, &c, &d,  0,  6, T49);
 242         Md5Set4(X, &d, &a, &b, &c,  7, 10, T50);
 243         Md5Set4(X, &c, &d, &a, &b, 14, 15, T51);
 244         Md5Set4(X, &b, &c, &d, &a,  5, 21, T52);
 245         Md5Set4(X, &a, &b, &c, &d, 12,  6, T53);
 246         Md5Set4(X, &d, &a, &b, &c,  3, 10, T54);
 247         Md5Set4(X, &c, &d, &a, &b, 10, 15, T55);
 248         Md5Set4(X, &b, &c, &d, &a,  1, 21, T56);
 249         Md5Set4(X, &a, &b, &c, &d,  8,  6, T57);
 250         Md5Set4(X, &d, &a, &b, &c, 15, 10, T58);
 251         Md5Set4(X, &c, &d, &a, &b,  6, 15, T59);
 252         Md5Set4(X, &b, &c, &d, &a, 13, 21, T60);
 253         Md5Set4(X, &a, &b, &c, &d,  4,  6, T61);
 254         Md5Set4(X, &d, &a, &b, &c, 11, 10, T62);
 255         Md5Set4(X, &c, &d, &a, &b,  2, 15, T63);
 256         Md5Set4(X, &b, &c, &d, &a,  9, 21, T64);
 257
 258         /* Then perform the following additions. (That is increment each
 259          * of the four registers by the value it had before this block
 260          * was started.) */
 261         this->abcd[0] += a;
 262         this->abcd[1] += b;
 263         this->abcd[2] += c;
 264         this->abcd[3] += d;
 265 }
 266
 267 void Md5::Append(const void *data, const size_t nbytes)
 268 {
 269         const uint8 *p = (const uint8 *)data;
 270         size_t left = nbytes;
 271         const size_t offset = (this->count[0] >> 3) & 63;
 272         const uint32 nbits = (uint32)(nbytes << 3);
 273
 274         if (nbytes <= 0) return;
 275
 276         /* Update the message length. */
 277         this->count[1] += (uint32)(nbytes >> 29);
 278         this->count[0] += nbits;
 279
 280         if (this->count[0] < nbits) this->count[1]++;
 281
 282         /* Process an initial partial block. */
 283         if (offset) {
 284                 size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
 285
 286                 memcpy(this->buf + offset, p, copy);
 287
 288                 if (offset + copy < 64) return;
 289
 290                 p += copy;
 291                 left -= copy;
 292                 this->Process(this->buf);
 293         }
 294
 295         /* Process full blocks. */
 296         for (; left >= 64; p += 64, left -= 64) this->Process(p);
 297
 298         /* Process a final partial block. */
 299         if (left) memcpy(this->buf, p, left);
 300 }
 301
 302 void Md5::Finish(uint8 digest[16])
 303 {
 304         static const uint8 pad[64] = {
 305                 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 306                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 307                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 308                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
 309         };
 310         uint8 data[8];
 311
 312         /* Save the length before padding. */
 313         for (uint i = 0; i < 8; ++i) {
 314                 data[i] = (uint8)(this->count[i >> 2] >> ((i & 3) << 3));
 315         }
 316
 317         /* Pad to 56 bytes mod 64. */
 318         this->Append(pad, ((55 - (this->count[0] >> 3)) & 63) + 1);
 319         /* Append the length. */
 320         this->Append(data, 8);
 321
 322         for (uint i = 0; i < 16; ++i) {
 323                 digest[i] = (uint8)(this->abcd[i >> 2] >> ((i & 3) << 3));
 324         }
 325 }