src/3rdparty/md5/md5.cpp

   1 /** @file md5.cpp Creating MD5 checksums of files. */
   2
   3 /*
   4   Copyright (C) 1999, 2000, 2002 Aladdin Enterprises.  All rights reserved.
   5
   6   This software is provided 'as-is', without any express or implied
   7   warranty.  In no event will the authors be held liable for any damages
   8   arising from the use of this software.
   9
  10   Permission is granted to anyone to use this software for any purpose,
  11   including commercial applications, and to alter it and redistribute it
  12   freely, subject to the following restrictions:
  13
  14   1. The origin of this software must not be misrepresented; you must not
  15      claim that you wrote the original software. If you use this software
  16      in a product, an acknowledgment in the product documentation would be
  17      appreciated but is not required.
  18   2. Altered source versions must be plainly marked as such, and must not be
  19      misrepresented as being the original software.
  20   3. This notice may not be removed or altered from any source distribution.
  21
  22   L. Peter Deutsch
  23   ghost@aladdin.com
  24
  25  */
  26
  27 /*
  28   Independent implementation of MD5 (RFC 1321).
  29
  30   This code implements the MD5 Algorithm defined in RFC 1321, whose
  31   text is available at
  32   http://www.ietf.org/rfc/rfc1321.txt
  33   The code is derived from the text of the RFC, including the test suite
  34   (section A.5) but excluding the rest of Appendix A.  It does not include
  35   any code or documentation that is identified in the RFC as being
  36   copyrighted.
  37
  38   The original and principal author of md5.c is L. Peter Deutsch
  39   <ghost@aladdin.com>.  Other authors are noted in the change history
  40   that follows (in reverse chronological order):
  41
  42   2007-12-24 Changed to C++ and adapted to OpenTTD source
  43   2002-04-13 lpd Clarified derivation from RFC 1321; now handles byte order
  44              either statically or dynamically; added missing #include <string.h>
  45              in library.
  46   2002-03-11 lpd Corrected argument list for main(), and added int return
  47              type, in test program and T value program.
  48   2002-02-21 lpd Added missing #include <stdio.h> in test program.
  49   2000-07-03 lpd Patched to eliminate warnings about "constant is
  50              unsigned in ANSI C, signed in traditional"; made test program
  51              self-checking.
  52   1999-11-04 lpd Edited comments slightly for automatic TOC extraction.
  53   1999-10-18 lpd Fixed typo in header comment (ansi2knr rather than md5).
  54   1999-05-03 lpd Original version.
  55  */
  56
  57 #include "../../stdafx.h"
  58 #include "../../core/endian_func.hpp"
  59 #include "md5.h"
  60
  61 #include "../../safeguards.h"
  62
  63 #define T_MASK ((uint32_t)~0)
  64 #define T1 /* 0xd76aa478 */ (T_MASK ^ 0x28955b87)
  65 #define T2 /* 0xe8c7b756 */ (T_MASK ^ 0x173848a9)
  66 #define T3    0x242070db
  67 #define T4 /* 0xc1bdceee */ (T_MASK ^ 0x3e423111)
  68 #define T5 /* 0xf57c0faf */ (T_MASK ^ 0x0a83f050)
  69 #define T6    0x4787c62a
  70 #define T7 /* 0xa8304613 */ (T_MASK ^ 0x57cfb9ec)
  71 #define T8 /* 0xfd469501 */ (T_MASK ^ 0x02b96afe)
  72 #define T9    0x698098d8
  73 #define T10 /* 0x8b44f7af */ (T_MASK ^ 0x74bb0850)
  74 #define T11 /* 0xffff5bb1 */ (T_MASK ^ 0x0000a44e)
  75 #define T12 /* 0x895cd7be */ (T_MASK ^ 0x76a32841)
  76 #define T13    0x6b901122
  77 #define T14 /* 0xfd987193 */ (T_MASK ^ 0x02678e6c)
  78 #define T15 /* 0xa679438e */ (T_MASK ^ 0x5986bc71)
  79 #define T16    0x49b40821
  80 #define T17 /* 0xf61e2562 */ (T_MASK ^ 0x09e1da9d)
  81 #define T18 /* 0xc040b340 */ (T_MASK ^ 0x3fbf4cbf)
  82 #define T19    0x265e5a51
  83 #define T20 /* 0xe9b6c7aa */ (T_MASK ^ 0x16493855)
  84 #define T21 /* 0xd62f105d */ (T_MASK ^ 0x29d0efa2)
  85 #define T22    0x02441453
  86 #define T23 /* 0xd8a1e681 */ (T_MASK ^ 0x275e197e)
  87 #define T24 /* 0xe7d3fbc8 */ (T_MASK ^ 0x182c0437)
  88 #define T25    0x21e1cde6
  89 #define T26 /* 0xc33707d6 */ (T_MASK ^ 0x3cc8f829)
  90 #define T27 /* 0xf4d50d87 */ (T_MASK ^ 0x0b2af278)
  91 #define T28    0x455a14ed
  92 #define T29 /* 0xa9e3e905 */ (T_MASK ^ 0x561c16fa)
  93 #define T30 /* 0xfcefa3f8 */ (T_MASK ^ 0x03105c07)
  94 #define T31    0x676f02d9
  95 #define T32 /* 0x8d2a4c8a */ (T_MASK ^ 0x72d5b375)
  96 #define T33 /* 0xfffa3942 */ (T_MASK ^ 0x0005c6bd)
  97 #define T34 /* 0x8771f681 */ (T_MASK ^ 0x788e097e)
  98 #define T35    0x6d9d6122
  99 #define T36 /* 0xfde5380c */ (T_MASK ^ 0x021ac7f3)
 100 #define T37 /* 0xa4beea44 */ (T_MASK ^ 0x5b4115bb)
 101 #define T38    0x4bdecfa9
 102 #define T39 /* 0xf6bb4b60 */ (T_MASK ^ 0x0944b49f)
 103 #define T40 /* 0xbebfbc70 */ (T_MASK ^ 0x4140438f)
 104 #define T41    0x289b7ec6
 105 #define T42 /* 0xeaa127fa */ (T_MASK ^ 0x155ed805)
 106 #define T43 /* 0xd4ef3085 */ (T_MASK ^ 0x2b10cf7a)
 107 #define T44    0x04881d05
 108 #define T45 /* 0xd9d4d039 */ (T_MASK ^ 0x262b2fc6)
 109 #define T46 /* 0xe6db99e5 */ (T_MASK ^ 0x1924661a)
 110 #define T47    0x1fa27cf8
 111 #define T48 /* 0xc4ac5665 */ (T_MASK ^ 0x3b53a99a)
 112 #define T49 /* 0xf4292244 */ (T_MASK ^ 0x0bd6ddbb)
 113 #define T50    0x432aff97
 114 #define T51 /* 0xab9423a7 */ (T_MASK ^ 0x546bdc58)
 115 #define T52 /* 0xfc93a039 */ (T_MASK ^ 0x036c5fc6)
 116 #define T53    0x655b59c3
 117 #define T54 /* 0x8f0ccc92 */ (T_MASK ^ 0x70f3336d)
 118 #define T55 /* 0xffeff47d */ (T_MASK ^ 0x00100b82)
 119 #define T56 /* 0x85845dd1 */ (T_MASK ^ 0x7a7ba22e)
 120 #define T57    0x6fa87e4f
 121 #define T58 /* 0xfe2ce6e0 */ (T_MASK ^ 0x01d3191f)
 122 #define T59 /* 0xa3014314 */ (T_MASK ^ 0x5cfebceb)
 123 #define T60    0x4e0811a1
 124 #define T61 /* 0xf7537e82 */ (T_MASK ^ 0x08ac817d)
 125 #define T62 /* 0xbd3af235 */ (T_MASK ^ 0x42c50dca)
 126 #define T63    0x2ad7d2bb
 127 #define T64 /* 0xeb86d391 */ (T_MASK ^ 0x14792c6e)
 128
 129 static inline void Md5Set1(const uint32_t *X, uint32_t *a, const uint32_t *b, const uint32_t *c, const uint32_t *d, const uint8_t k, const uint8_t s, const uint32_t Ti)
 130 {
 131         uint32_t t = (*b & *c) | (~*b & *d);
 132         t += *a + X[k] + Ti;
 133         *a = std::rotl(t, s) + *b;
 134 }
 135
 136 static inline void Md5Set2(const uint32_t *X, uint32_t *a, const uint32_t *b, const uint32_t *c, const uint32_t *d, const uint8_t k, const uint8_t s, const uint32_t Ti)
 137 {
 138         uint32_t t = (*b & *d) | (*c & ~*d);
 139         t += *a + X[k] + Ti;
 140         *a = std::rotl(t, s) + *b;
 141 }
 142
 143
 144 static inline void Md5Set3(const uint32_t *X, uint32_t *a, const uint32_t *b, const uint32_t *c, const uint32_t *d, const uint8_t k, const uint8_t s, const uint32_t Ti)
 145 {
 146         uint32_t t = *b ^ *c ^ *d;
 147         t += *a + X[k] + Ti;
 148         *a = std::rotl(t, s) + *b;
 149 }
 150
 151 static inline void Md5Set4(const uint32_t *X, uint32_t *a, const uint32_t *b, const uint32_t *c, const uint32_t *d, const uint8_t k, const uint8_t s, const uint32_t Ti)
 152 {
 153         uint32_t t = *c ^ (*b | ~*d);
 154         t += *a + X[k] + Ti;
 155         *a = std::rotl(t, s) + *b;
 156 }
 157
 158 Md5::Md5()
 159 {
 160         count[0] = 0;
 161         count[1] = 0;
 162         abcd[0] = 0x67452301;
 163         abcd[1] = /*0xefcdab89*/ T_MASK ^ 0x10325476;
 164         abcd[2] = /*0x98badcfe*/ T_MASK ^ 0x67452301;
 165         abcd[3] = 0x10325476;
 166 }
 167
 168 void Md5::Process(const uint8_t *data /*[64]*/)
 169 {
 170         uint32_t a = this->abcd[0];
 171         uint32_t b = this->abcd[1];
 172         uint32_t c = this->abcd[2];
 173         uint32_t d = this->abcd[3];
 174
 175         uint32_t X[16];
 176
 177         /* Convert the uint8_t data to uint32_t LE */
 178         const uint32_t *px = (const uint32_t *)data;
 179         for (uint i = 0; i < 16; i++) {
 180                 X[i] = TO_LE32(*px);
 181                 px++;
 182         }
 183
 184         /* Round 1. */
 185         Md5Set1(X, &a, &b, &c, &d,  0,  7,  T1);
 186         Md5Set1(X, &d, &a, &b, &c,  1, 12,  T2);
 187         Md5Set1(X, &c, &d, &a, &b,  2, 17,  T3);
 188         Md5Set1(X, &b, &c, &d, &a,  3, 22,  T4);
 189         Md5Set1(X, &a, &b, &c, &d,  4,  7,  T5);
 190         Md5Set1(X, &d, &a, &b, &c,  5, 12,  T6);
 191         Md5Set1(X, &c, &d, &a, &b,  6, 17,  T7);
 192         Md5Set1(X, &b, &c, &d, &a,  7, 22,  T8);
 193         Md5Set1(X, &a, &b, &c, &d,  8,  7,  T9);
 194         Md5Set1(X, &d, &a, &b, &c,  9, 12, T10);
 195         Md5Set1(X, &c, &d, &a, &b, 10, 17, T11);
 196         Md5Set1(X, &b, &c, &d, &a, 11, 22, T12);
 197         Md5Set1(X, &a, &b, &c, &d, 12,  7, T13);
 198         Md5Set1(X, &d, &a, &b, &c, 13, 12, T14);
 199         Md5Set1(X, &c, &d, &a, &b, 14, 17, T15);
 200         Md5Set1(X, &b, &c, &d, &a, 15, 22, T16);
 201
 202         /* Round 2. */
 203         Md5Set2(X, &a, &b, &c, &d,  1,  5, T17);
 204         Md5Set2(X, &d, &a, &b, &c,  6,  9, T18);
 205         Md5Set2(X, &c, &d, &a, &b, 11, 14, T19);
 206         Md5Set2(X, &b, &c, &d, &a,  0, 20, T20);
 207         Md5Set2(X, &a, &b, &c, &d,  5,  5, T21);
 208         Md5Set2(X, &d, &a, &b, &c, 10,  9, T22);
 209         Md5Set2(X, &c, &d, &a, &b, 15, 14, T23);
 210         Md5Set2(X, &b, &c, &d, &a,  4, 20, T24);
 211         Md5Set2(X, &a, &b, &c, &d,  9,  5, T25);
 212         Md5Set2(X, &d, &a, &b, &c, 14,  9, T26);
 213         Md5Set2(X, &c, &d, &a, &b,  3, 14, T27);
 214         Md5Set2(X, &b, &c, &d, &a,  8, 20, T28);
 215         Md5Set2(X, &a, &b, &c, &d, 13,  5, T29);
 216         Md5Set2(X, &d, &a, &b, &c,  2,  9, T30);
 217         Md5Set2(X, &c, &d, &a, &b,  7, 14, T31);
 218         Md5Set2(X, &b, &c, &d, &a, 12, 20, T32);
 219
 220         /* Round 3. */
 221         Md5Set3(X, &a, &b, &c, &d,  5,  4, T33);
 222         Md5Set3(X, &d, &a, &b, &c,  8, 11, T34);
 223         Md5Set3(X, &c, &d, &a, &b, 11, 16, T35);
 224         Md5Set3(X, &b, &c, &d, &a, 14, 23, T36);
 225         Md5Set3(X, &a, &b, &c, &d,  1,  4, T37);
 226         Md5Set3(X, &d, &a, &b, &c,  4, 11, T38);
 227         Md5Set3(X, &c, &d, &a, &b,  7, 16, T39);
 228         Md5Set3(X, &b, &c, &d, &a, 10, 23, T40);
 229         Md5Set3(X, &a, &b, &c, &d, 13,  4, T41);
 230         Md5Set3(X, &d, &a, &b, &c,  0, 11, T42);
 231         Md5Set3(X, &c, &d, &a, &b,  3, 16, T43);
 232         Md5Set3(X, &b, &c, &d, &a,  6, 23, T44);
 233         Md5Set3(X, &a, &b, &c, &d,  9,  4, T45);
 234         Md5Set3(X, &d, &a, &b, &c, 12, 11, T46);
 235         Md5Set3(X, &c, &d, &a, &b, 15, 16, T47);
 236         Md5Set3(X, &b, &c, &d, &a,  2, 23, T48);
 237
 238         /* Round 4. */
 239         Md5Set4(X, &a, &b, &c, &d,  0,  6, T49);
 240         Md5Set4(X, &d, &a, &b, &c,  7, 10, T50);
 241         Md5Set4(X, &c, &d, &a, &b, 14, 15, T51);
 242         Md5Set4(X, &b, &c, &d, &a,  5, 21, T52);
 243         Md5Set4(X, &a, &b, &c, &d, 12,  6, T53);
 244         Md5Set4(X, &d, &a, &b, &c,  3, 10, T54);
 245         Md5Set4(X, &c, &d, &a, &b, 10, 15, T55);
 246         Md5Set4(X, &b, &c, &d, &a,  1, 21, T56);
 247         Md5Set4(X, &a, &b, &c, &d,  8,  6, T57);
 248         Md5Set4(X, &d, &a, &b, &c, 15, 10, T58);
 249         Md5Set4(X, &c, &d, &a, &b,  6, 15, T59);
 250         Md5Set4(X, &b, &c, &d, &a, 13, 21, T60);
 251         Md5Set4(X, &a, &b, &c, &d,  4,  6, T61);
 252         Md5Set4(X, &d, &a, &b, &c, 11, 10, T62);
 253         Md5Set4(X, &c, &d, &a, &b,  2, 15, T63);
 254         Md5Set4(X, &b, &c, &d, &a,  9, 21, T64);
 255
 256         /* Then perform the following additions. (That is increment each
 257          * of the four registers by the value it had before this block
 258          * was started.) */
 259         this->abcd[0] += a;
 260         this->abcd[1] += b;
 261         this->abcd[2] += c;
 262         this->abcd[3] += d;
 263 }
 264
 265 void Md5::Append(const void *data, const size_t nbytes)
 266 {
 267         const uint8_t *p = (const uint8_t *)data;
 268         size_t left = nbytes;
 269         const size_t offset = (this->count[0] >> 3) & 63;
 270         const uint32_t nbits = (uint32_t)(nbytes << 3);
 271
 272         if (nbytes <= 0) return;
 273
 274         /* Update the message length. */
 275         this->count[1] += (uint32_t)(nbytes >> 29);
 276         this->count[0] += nbits;
 277
 278         if (this->count[0] < nbits) this->count[1]++;
 279
 280         /* Process an initial partial block. */
 281         if (offset) {
 282                 size_t copy = (offset + nbytes > 64 ? 64 - offset : nbytes);
 283
 284                 memcpy(this->buf + offset, p, copy);
 285
 286                 if (offset + copy < 64) return;
 287
 288                 p += copy;
 289                 left -= copy;
 290                 this->Process(this->buf);
 291         }
 292
 293         /* Process full blocks. */
 294         for (; left >= 64; p += 64, left -= 64) this->Process(p);
 295
 296         /* Process a final partial block. */
 297         if (left) memcpy(this->buf, p, left);
 298 }
 299
 300 void Md5::Finish(MD5Hash &digest)
 301 {
 302         static const uint8_t pad[64] = {
 303                 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 304                 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 305                 0, 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         };
 308         uint8_t data[8];
 309
 310         /* Save the length before padding. */
 311         for (uint i = 0; i < 8; ++i) {
 312                 data[i] = (uint8_t)(this->count[i >> 2] >> ((i & 3) << 3));
 313         }
 314
 315         /* Pad to 56 bytes mod 64. */
 316         this->Append(pad, ((55 - (this->count[0] >> 3)) & 63) + 1);
 317         /* Append the length. */
 318         this->Append(data, 8);
 319
 320         for (uint i = 0; i < 16; ++i) {
 321                 digest[i] = (uint8_t)(this->abcd[i >> 2] >> ((i & 3) << 3));
 322         }
 323 }