package/network/services/ead/src/pw_encrypt_md5.c

   1 /*
   2  * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
   3  *
   4  * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
   5  * rights reserved.
   6  *
   7  * License to copy and use this software is granted provided that it
   8  * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
   9  * Algorithm" in all material mentioning or referencing this software
  10  * or this function.
  11  *
  12  * License is also granted to make and use derivative works provided
  13  * that such works are identified as "derived from the RSA Data
  14  * Security, Inc. MD5 Message-Digest Algorithm" in all material
  15  * mentioning or referencing the derived work.
  16  *
  17  * RSA Data Security, Inc. makes no representations concerning either
  18  * the merchantability of this software or the suitability of this
  19  * software for any particular purpose. It is provided "as is"
  20  * without express or implied warranty of any kind.
  21  *
  22  * These notices must be retained in any copies of any part of this
  23  * documentation and/or software.
  24  *
  25  * $FreeBSD: src/lib/libmd/md5c.c,v 1.9.2.1 1999/08/29 14:57:12 peter Exp $
  26  *
  27  * This code is the same as the code published by RSA Inc.  It has been
  28  * edited for clarity and style only.
  29  *
  30  * ----------------------------------------------------------------------------
  31  * The md5_crypt() function was taken from freeBSD's libcrypt and contains
  32  * this license:
  33  *    "THE BEER-WARE LICENSE" (Revision 42):
  34  *     <phk@login.dknet.dk> wrote this file.  As long as you retain this notice you
  35  *     can do whatever you want with this stuff. If we meet some day, and you think
  36  *     this stuff is worth it, you can buy me a beer in return.   Poul-Henning Kamp
  37  *
  38  * $FreeBSD: src/lib/libcrypt/crypt.c,v 1.7.2.1 1999/08/29 14:56:33 peter Exp $
  39  *
  40  * ----------------------------------------------------------------------------
  41  * On April 19th, 2001 md5_crypt() was modified to make it reentrant
  42  * by Erik Andersen <andersen@uclibc.org>
  43  *
  44  *
  45  * June 28, 2001             Manuel Novoa III
  46  *
  47  * "Un-inlined" code using loops and static const tables in order to
  48  * reduce generated code size (on i386 from approx 4k to approx 2.5k).
  49  *
  50  * June 29, 2001             Manuel Novoa III
  51  *
  52  * Completely removed static PADDING array.
  53  *
  54  * Reintroduced the loop unrolling in MD5_Transform and added the
  55  * MD5_SIZE_OVER_SPEED option for configurability.  Define below as:
  56  *       0    fully unrolled loops
  57  *       1    partially unrolled (4 ops per loop)
  58  *       2    no unrolling -- introduces the need to swap 4 variables (slow)
  59  *       3    no unrolling and all 4 loops merged into one with switch
  60  *               in each loop (glacial)
  61  * On i386, sizes are roughly (-Os -fno-builtin):
  62  *     0: 3k     1: 2.5k     2: 2.2k     3: 2k
  63  *
  64  *
  65  * Since SuSv3 does not require crypt_r, modified again August 7, 2002
  66  * by Erik Andersen to remove reentrance stuff...
  67  */
  68
  69 static const uint8_t ascii64[] = "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
  70
  71 /*
  72  * Valid values are  1 (fastest/largest) to 3 (smallest/slowest).
  73  */
  74 #define MD5_SIZE_OVER_SPEED 3
  75
  76 /**********************************************************************/
  77
  78 /* MD5 context. */
  79 struct MD5Context {
  80         uint32_t state[4];      /* state (ABCD) */
  81         uint32_t count[2];      /* number of bits, modulo 2^64 (lsb first) */
  82         unsigned char buffer[64];       /* input buffer */
  83 };
  84
  85 static void __md5_Init(struct MD5Context *);
  86 static void __md5_Update(struct MD5Context *, const unsigned char *, unsigned int);
  87 static void __md5_Pad(struct MD5Context *);
  88 static void __md5_Final(unsigned char [16], struct MD5Context *);
  89 static void __md5_Transform(uint32_t [4], const unsigned char [64]);
  90
  91
  92 #define MD5_MAGIC_STR "$1$"
  93 #define MD5_MAGIC_LEN (sizeof(MD5_MAGIC_STR) - 1)
  94 static const unsigned char __md5__magic[] = MD5_MAGIC_STR;
  95
  96
  97 #ifdef i386
  98 #define __md5_Encode memcpy
  99 #define __md5_Decode memcpy
 100 #else /* i386 */
 101
 102 /*
 103  * __md5_Encodes input (uint32_t) into output (unsigned char). Assumes len is
 104  * a multiple of 4.
 105  */
 106 static void
 107 __md5_Encode(unsigned char *output, uint32_t *input, unsigned int len)
 108 {
 109         unsigned int i, j;
 110
 111         for (i = 0, j = 0; j < len; i++, j += 4) {
 112                 output[j] = input[i];
 113                 output[j+1] = (input[i] >> 8);
 114                 output[j+2] = (input[i] >> 16);
 115                 output[j+3] = (input[i] >> 24);
 116         }
 117 }
 118
 119 /*
 120  * __md5_Decodes input (unsigned char) into output (uint32_t). Assumes len is
 121  * a multiple of 4.
 122  */
 123 static void
 124 __md5_Decode(uint32_t *output, const unsigned char *input, unsigned int len)
 125 {
 126         unsigned int i, j;
 127
 128         for (i = 0, j = 0; j < len; i++, j += 4)
 129                 output[i] = ((uint32_t)input[j]) | (((uint32_t)input[j+1]) << 8) |
 130                     (((uint32_t)input[j+2]) << 16) | (((uint32_t)input[j+3]) << 24);
 131 }
 132 #endif /* i386 */
 133
 134 /* F, G, H and I are basic MD5 functions. */
 135 #define F(x, y, z) (((x) & (y)) | (~(x) & (z)))
 136 #define G(x, y, z) (((x) & (z)) | ((y) & ~(z)))
 137 #define H(x, y, z) ((x) ^ (y) ^ (z))
 138 #define I(x, y, z) ((y) ^ ((x) | ~(z)))
 139
 140 /* ROTATE_LEFT rotates x left n bits. */
 141 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
 142
 143 /*
 144  * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
 145  * Rotation is separate from addition to prevent recomputation.
 146  */
 147 #define FF(a, b, c, d, x, s, ac) { \
 148         (a) += F ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 149         (a) = ROTATE_LEFT((a), (s)); \
 150         (a) += (b); \
 151         }
 152 #define GG(a, b, c, d, x, s, ac) { \
 153         (a) += G ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 154         (a) = ROTATE_LEFT((a), (s)); \
 155         (a) += (b); \
 156         }
 157 #define HH(a, b, c, d, x, s, ac) { \
 158         (a) += H ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 159         (a) = ROTATE_LEFT((a), (s)); \
 160         (a) += (b); \
 161         }
 162 #define II(a, b, c, d, x, s, ac) { \
 163         (a) += I ((b), (c), (d)) + (x) + (uint32_t)(ac); \
 164         (a) = ROTATE_LEFT((a), (s)); \
 165         (a) += (b); \
 166         }
 167
 168 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
 169 static void __md5_Init(struct MD5Context *context)
 170 {
 171         context->count[0] = context->count[1] = 0;
 172
 173         /* Load magic initialization constants.  */
 174         context->state[0] = 0x67452301;
 175         context->state[1] = 0xefcdab89;
 176         context->state[2] = 0x98badcfe;
 177         context->state[3] = 0x10325476;
 178 }
 179
 180 /*
 181  * MD5 block update operation. Continues an MD5 message-digest
 182  * operation, processing another message block, and updating the
 183  * context.
 184  */
 185 static void __md5_Update(struct MD5Context *context, const unsigned char *input, unsigned int inputLen)
 186 {
 187         unsigned int i, idx, partLen;
 188
 189         /* Compute number of bytes mod 64 */
 190         idx = (context->count[0] >> 3) & 0x3F;
 191
 192         /* Update number of bits */
 193         context->count[0] += (inputLen << 3);
 194         if (context->count[0] < (inputLen << 3))
 195                 context->count[1]++;
 196         context->count[1] += (inputLen >> 29);
 197
 198         partLen = 64 - idx;
 199
 200         /* Transform as many times as possible. */
 201         if (inputLen >= partLen) {
 202                 memcpy(&context->buffer[idx], input, partLen);
 203                 __md5_Transform(context->state, context->buffer);
 204
 205                 for (i = partLen; i + 63 < inputLen; i += 64)
 206                         __md5_Transform(context->state, &input[i]);
 207
 208                 idx = 0;
 209         } else
 210                 i = 0;
 211
 212         /* Buffer remaining input */
 213         memcpy(&context->buffer[idx], &input[i], inputLen - i);
 214 }
 215
 216 /*
 217  * MD5 padding. Adds padding followed by original length.
 218  */
 219 static void __md5_Pad(struct MD5Context *context)
 220 {
 221         unsigned char bits[8];
 222         unsigned int idx, padLen;
 223         unsigned char PADDING[64];
 224
 225         memset(PADDING, 0, sizeof(PADDING));
 226         PADDING[0] = 0x80;
 227
 228         /* Save number of bits */
 229         __md5_Encode(bits, context->count, 8);
 230
 231         /* Pad out to 56 mod 64. */
 232         idx = (context->count[0] >> 3) & 0x3f;
 233         padLen = (idx < 56) ? (56 - idx) : (120 - idx);
 234         __md5_Update(context, PADDING, padLen);
 235
 236         /* Append length (before padding) */
 237         __md5_Update(context, bits, 8);
 238 }
 239
 240 /*
 241  * MD5 finalization. Ends an MD5 message-digest operation, writing the
 242  * the message digest and zeroizing the context.
 243  */
 244 static void __md5_Final(unsigned char digest[16], struct MD5Context *context)
 245 {
 246         /* Do padding. */
 247         __md5_Pad(context);
 248
 249         /* Store state in digest */
 250         __md5_Encode(digest, context->state, 16);
 251
 252         /* Zeroize sensitive information. */
 253         memset(context, 0, sizeof(*context));
 254 }
 255
 256 /* MD5 basic transformation. Transforms state based on block. */
 257 static void __md5_Transform(uint32_t state[4], const unsigned char block[64])
 258 {
 259         uint32_t a, b, c, d, x[16];
 260 #if MD5_SIZE_OVER_SPEED > 1
 261         uint32_t temp;
 262         const unsigned char *ps;
 263
 264         static const unsigned char S[] = {
 265                 7, 12, 17, 22,
 266                 5, 9, 14, 20,
 267                 4, 11, 16, 23,
 268                 6, 10, 15, 21
 269         };
 270 #endif /* MD5_SIZE_OVER_SPEED > 1 */
 271
 272 #if MD5_SIZE_OVER_SPEED > 0
 273         const uint32_t *pc;
 274         const unsigned char *pp;
 275         int i;
 276
 277         static const uint32_t C[] = {
 278                                                                 /* round 1 */
 279                 0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
 280                 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
 281                 0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
 282                 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
 283                                                                 /* round 2 */
 284                 0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
 285                 0xd62f105d, 0x2441453,  0xd8a1e681, 0xe7d3fbc8,
 286                 0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
 287                 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
 288                                                                 /* round 3 */
 289                 0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
 290                 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
 291                 0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
 292                 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
 293                                                                 /* round 4 */
 294                 0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
 295                 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
 296                 0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
 297                 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391
 298         };
 299
 300         static const unsigned char P[] = {
 301                 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, /* 1 */
 302                 1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12, /* 2 */
 303                 5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2, /* 3 */
 304                 0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9  /* 4 */
 305         };
 306
 307 #endif /* MD5_SIZE_OVER_SPEED > 0 */
 308
 309         __md5_Decode(x, block, 64);
 310
 311         a = state[0]; b = state[1]; c = state[2]; d = state[3];
 312
 313 #if MD5_SIZE_OVER_SPEED > 2
 314         pc = C; pp = P; ps = S - 4;
 315
 316         for (i = 0; i < 64; i++) {
 317                 if ((i & 0x0f) == 0) ps += 4;
 318                 temp = a;
 319                 switch (i>>4) {
 320                         case 0:
 321                                 temp += F(b, c, d);
 322                                 break;
 323                         case 1:
 324                                 temp += G(b, c, d);
 325                                 break;
 326                         case 2:
 327                                 temp += H(b, c, d);
 328                                 break;
 329                         case 3:
 330                                 temp += I(b, c, d);
 331                                 break;
 332                 }
 333                 temp += x[*pp++] + *pc++;
 334                 temp = ROTATE_LEFT(temp, ps[i & 3]);
 335                 temp += b;
 336                 a = d; d = c; c = b; b = temp;
 337         }
 338 #elif MD5_SIZE_OVER_SPEED > 1
 339         pc = C; pp = P; ps = S;
 340
 341         /* Round 1 */
 342         for (i = 0; i < 16; i++) {
 343                 FF(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
 344                 temp = d; d = c; c = b; b = a; a = temp;
 345         }
 346
 347         /* Round 2 */
 348         ps += 4;
 349         for (; i < 32; i++) {
 350                 GG(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
 351                 temp = d; d = c; c = b; b = a; a = temp;
 352         }
 353         /* Round 3 */
 354         ps += 4;
 355         for (; i < 48; i++) {
 356                 HH(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
 357                 temp = d; d = c; c = b; b = a; a = temp;
 358         }
 359
 360         /* Round 4 */
 361         ps += 4;
 362         for (; i < 64; i++) {
 363                 II(a, b, c, d, x[*pp], ps[i & 0x3], *pc); pp++; pc++;
 364                 temp = d; d = c; c = b; b = a; a = temp;
 365         }
 366 #elif MD5_SIZE_OVER_SPEED > 0
 367         pc = C; pp = P;
 368
 369         /* Round 1 */
 370         for (i = 0; i < 4; i++) {
 371                 FF(a, b, c, d, x[*pp],  7, *pc); pp++; pc++;
 372                 FF(d, a, b, c, x[*pp], 12, *pc); pp++; pc++;
 373                 FF(c, d, a, b, x[*pp], 17, *pc); pp++; pc++;
 374                 FF(b, c, d, a, x[*pp], 22, *pc); pp++; pc++;
 375         }
 376
 377         /* Round 2 */
 378         for (i = 0; i < 4; i++) {
 379                 GG(a, b, c, d, x[*pp],  5, *pc); pp++; pc++;
 380                 GG(d, a, b, c, x[*pp],  9, *pc); pp++; pc++;
 381                 GG(c, d, a, b, x[*pp], 14, *pc); pp++; pc++;
 382                 GG(b, c, d, a, x[*pp], 20, *pc); pp++; pc++;
 383         }
 384         /* Round 3 */
 385         for (i = 0; i < 4; i++) {
 386                 HH(a, b, c, d, x[*pp],  4, *pc); pp++; pc++;
 387                 HH(d, a, b, c, x[*pp], 11, *pc); pp++; pc++;
 388                 HH(c, d, a, b, x[*pp], 16, *pc); pp++; pc++;
 389                 HH(b, c, d, a, x[*pp], 23, *pc); pp++; pc++;
 390         }
 391
 392         /* Round 4 */
 393         for (i = 0; i < 4; i++) {
 394                 II(a, b, c, d, x[*pp],  6, *pc); pp++; pc++;
 395                 II(d, a, b, c, x[*pp], 10, *pc); pp++; pc++;
 396                 II(c, d, a, b, x[*pp], 15, *pc); pp++; pc++;
 397                 II(b, c, d, a, x[*pp], 21, *pc); pp++; pc++;
 398         }
 399 #else
 400         /* Round 1 */
 401 #define S11 7
 402 #define S12 12
 403 #define S13 17
 404 #define S14 22
 405         FF(a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
 406         FF(d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
 407         FF(c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
 408         FF(b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
 409         FF(a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
 410         FF(d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
 411         FF(c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
 412         FF(b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
 413         FF(a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
 414         FF(d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
 415         FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
 416         FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
 417         FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
 418         FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
 419         FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
 420         FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
 421
 422         /* Round 2 */
 423 #define S21 5
 424 #define S22 9
 425 #define S23 14
 426 #define S24 20
 427         GG(a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
 428         GG(d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
 429         GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
 430         GG(b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
 431         GG(a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
 432         GG(d, a, b, c, x[10], S22,  0x2441453); /* 22 */
 433         GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
 434         GG(b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
 435         GG(a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
 436         GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
 437         GG(c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
 438         GG(b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
 439         GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
 440         GG(d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
 441         GG(c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
 442         GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
 443
 444         /* Round 3 */
 445 #define S31 4
 446 #define S32 11
 447 #define S33 16
 448 #define S34 23
 449         HH(a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
 450         HH(d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
 451         HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
 452         HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
 453         HH(a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
 454         HH(d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
 455         HH(c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
 456         HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
 457         HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
 458         HH(d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
 459         HH(c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
 460         HH(b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
 461         HH(a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
 462         HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
 463         HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
 464         HH(b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
 465
 466         /* Round 4 */
 467 #define S41 6
 468 #define S42 10
 469 #define S43 15
 470 #define S44 21
 471         II(a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
 472         II(d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
 473         II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
 474         II(b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
 475         II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
 476         II(d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
 477         II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
 478         II(b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
 479         II(a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
 480         II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
 481         II(c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
 482         II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
 483         II(a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
 484         II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
 485         II(c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
 486         II(b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
 487 #endif
 488
 489         state[0] += a;
 490         state[1] += b;
 491         state[2] += c;
 492         state[3] += d;
 493
 494         /* Zeroize sensitive information. */
 495         memset(x, 0, sizeof(x));
 496 }
 497
 498
 499 static char*
 500 __md5_to64(char *s, unsigned v, int n)
 501 {
 502         while (--n >= 0) {
 503                 *s++ = ascii64[v & 0x3f];
 504                 v >>= 6;
 505         }
 506         return s;
 507 }
 508
 509 /*
 510  * UNIX password
 511  *
 512  * Use MD5 for what it is best at...
 513  */
 514 #define MD5_OUT_BUFSIZE 36
 515 static char *
 516 md5_crypt(char passwd[MD5_OUT_BUFSIZE], const unsigned char *pw, const unsigned char *salt)
 517 {
 518         const unsigned char *sp, *ep;
 519         char *p;
 520         unsigned char final[17];        /* final[16] exists only to aid in looping */
 521         int sl, pl, i, pw_len;
 522         struct MD5Context ctx, ctx1;
 523
 524         /* Refine the Salt first */
 525         sp = salt;
 526
 527         sp += MD5_MAGIC_LEN;
 528
 529         /* It stops at the first '$', max 8 chars */
 530         for (ep = sp; *ep && *ep != '$' && ep < (sp+8); ep++)
 531                 continue;
 532
 533         /* get the length of the true salt */
 534         sl = ep - sp;
 535
 536         __md5_Init(&ctx);
 537
 538         /* The password first, since that is what is most unknown */
 539         pw_len = strlen((char*)pw);
 540         __md5_Update(&ctx, pw, pw_len);
 541
 542         /* Then our magic string */
 543         __md5_Update(&ctx, __md5__magic, MD5_MAGIC_LEN);
 544
 545         /* Then the raw salt */
 546         __md5_Update(&ctx, sp, sl);
 547
 548         /* Then just as many characters of the MD5(pw, salt, pw) */
 549         __md5_Init(&ctx1);
 550         __md5_Update(&ctx1, pw, pw_len);
 551         __md5_Update(&ctx1, sp, sl);
 552         __md5_Update(&ctx1, pw, pw_len);
 553         __md5_Final(final, &ctx1);
 554         for (pl = pw_len; pl > 0; pl -= 16)
 555                 __md5_Update(&ctx, final, pl > 16 ? 16 : pl);
 556
 557         /* Don't leave anything around in vm they could use. */
 558 //TODO: the above comment seems to be wrong. final is used later.
 559         memset(final, 0, sizeof(final));
 560
 561         /* Then something really weird... */
 562         for (i = pw_len; i; i >>= 1) {
 563                 __md5_Update(&ctx, ((i & 1) ? final : (const unsigned char *) pw), 1);
 564         }
 565
 566         /* Now make the output string */
 567         passwd[0] = '$';
 568         passwd[1] = '1';
 569         passwd[2] = '$';
 570         strncpy(passwd + 3, (char*)sp, sl);
 571         passwd[sl + 3] = '$';
 572
 573         __md5_Final(final, &ctx);
 574
 575         /*
 576          * and now, just to make sure things don't run too fast
 577          * On a 60 Mhz Pentium this takes 34 msec, so you would
 578          * need 30 seconds to build a 1000 entry dictionary...
 579          */
 580         for (i = 0; i < 1000; i++) {
 581                 __md5_Init(&ctx1);
 582                 if (i & 1)
 583                         __md5_Update(&ctx1, pw, pw_len);
 584                 else
 585                         __md5_Update(&ctx1, final, 16);
 586
 587                 if (i % 3)
 588                         __md5_Update(&ctx1, sp, sl);
 589
 590                 if (i % 7)
 591                         __md5_Update(&ctx1, pw, pw_len);
 592
 593                 if (i & 1)
 594                         __md5_Update(&ctx1, final, 16);
 595                 else
 596                         __md5_Update(&ctx1, pw, pw_len);
 597                 __md5_Final(final, &ctx1);
 598         }
 599
 600         p = passwd + sl + 4; /* 12 bytes max (sl is up to 8 bytes) */
 601
 602         /* Add 5*4+2 = 22 bytes of hash, + NUL byte. */
 603         final[16] = final[5];
 604         for (i = 0; i < 5; i++) {
 605                 unsigned l = (final[i] << 16) | (final[i+6] << 8) | final[i+12];
 606                 p = __md5_to64(p, l, 4);
 607         }
 608         p = __md5_to64(p, final[11], 2);
 609         *p = '\0';
 610
 611         /* Don't leave anything around in vm they could use. */
 612         memset(final, 0, sizeof(final));
 613
 614         return passwd;
 615 }
 616
 617 #undef MD5_SIZE_OVER_SPEED
 618 #undef MD5_MAGIC_STR
 619 #undef MD5_MAGIC_LEN
 620 #undef __md5_Encode
 621 #undef __md5_Decode
 622 #undef F
 623 #undef G
 624 #undef H
 625 #undef I
 626 #undef ROTATE_LEFT
 627 #undef FF
 628 #undef GG
 629 #undef HH
 630 #undef II
 631 #undef S11
 632 #undef S12
 633 #undef S13
 634 #undef S14
 635 #undef S21
 636 #undef S22
 637 #undef S23
 638 #undef S24
 639 #undef S31
 640 #undef S32
 641 #undef S33
 642 #undef S34
 643 #undef S41
 644 #undef S42
 645 #undef S43
 646 #undef S44