release/src/router/bpalogin/gen_md5.c

   1
   2 /*
   3  * COMPILE WITH:
   4  *      gcc -Wall gen_md5.c -o gen_md5
   5  */
   6
   7
   8 /* taken from RFC-1321/Appendix A.3 */
   9
  10 /*
  11  * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
  12  */
  13
  14 /*
  15  * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All rights
  16  * reserved.
  17  *
  18  * License to copy and use this software is granted provided that it is
  19  * identified as the "RSA Data Security, Inc. MD5 Message-Digest Algorithm"
  20  * in all material mentioning or referencing this software or this function.
  21  *
  22  * License is also granted to make and use derivative works provided that such
  23  * works are identified as "derived from the RSA Data Security, Inc. MD5
  24  * Message-Digest Algorithm" in all material mentioning or referencing the
  25  * derived work.
  26  *
  27  * RSA Data Security, Inc. makes no representations concerning either the
  28  * merchantability of this software or the suitability of this software for
  29  * any particular purpose. It is provided "as is" without express or implied
  30  * warranty of any kind.
  31  *
  32  * These notices must be retained in any copies of any part of this
  33  * documentation and/or software.
  34  */
  35
  36 #include <stdio.h>
  37
  38 #include "md5.h"
  39
  40 /*
  41  * Constants for MD5Transform routine.
  42  */
  43 #define S11 7
  44 #define S12 12
  45 #define S13 17
  46 #define S14 22
  47 #define S21 5
  48 #define S22 9
  49 #define S23 14
  50 #define S24 20
  51 #define S31 4
  52 #define S32 11
  53 #define S33 16
  54 #define S34 23
  55 #define S41 6
  56 #define S42 10
  57 #define S43 15
  58 #define S44 21
  59
  60 static void MD5Transform(unsigned int[4], unsigned char[64]);
  61 static void Encode(unsigned char *, unsigned int*, unsigned int);
  62 static void Decode(unsigned int*, unsigned char *, unsigned int);
  63 static void MD5_memcpy(unsigned char *, unsigned char *, unsigned int);
  64 static void MD5_memset(char *, int, unsigned int);
  65
  66 static unsigned char PADDING[64] =
  67 {
  68     0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  69     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  70     0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  71 };
  72
  73 /*
  74  * F, G, H and I are basic MD5 functions.
  75  */
  76 /* #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) */
  77 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  78 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  79 #define H(x, y, z) ((x) ^ (y) ^ (z))
  80 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  81
  82 /*
  83  * ROTATE_LEFT rotates x left n bits.
  84  */
  85 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  86
  87 /*
  88  * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is
  89  * separate from addition to prevent recomputation.
  90  */
  91 #define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + (unsigned int)(ac);  (a) = ROTATE_LEFT ((a), (s));  (a) += (b);   }
  92 #define GG(a, b, c, d, x, s, ac) {  (a) += G ((b), (c), (d)) + (x) + (unsigned int)(ac);  (a) = ROTATE_LEFT ((a), (s));  (a) += (b);   }
  93 #define HH(a, b, c, d, x, s, ac) {  (a) += H ((b), (c), (d)) + (x) + (unsigned int)(ac);  (a) = ROTATE_LEFT ((a), (s));  (a) += (b);   }
  94 #define II(a, b, c, d, x, s, ac) {  (a) += I ((b), (c), (d)) + (x) + (unsigned int)(ac);  (a) = ROTATE_LEFT ((a), (s));  (a) += (b);   }
  95
  96 /*
  97  * MD5 initialization. Begins an MD5 operation, writing a new context.
  98  */
  99 void
 100 MD5Init(MD5_CTX * context)
 101 {
 102     context->count[0] = context->count[1] = 0;
 103     /*
 104      * Load magic initialization constants.
 105      */
 106     context->state[0] = 0x67452301;
 107     context->state[1] = 0xefcdab89;
 108     context->state[2] = 0x98badcfe;
 109     context->state[3] = 0x10325476;
 110 }
 111
 112 /*
 113  * MD5 block update operation. Continues an MD5 message-digest operation,
 114  * processing another message block, and updating the context.
 115  */
 116 void
 117 MD5Update(MD5_CTX * context, unsigned char *input, unsigned int inputLen)
 118 {
 119     unsigned int i, index, partLen;
 120
 121     /* Compute number of bytes mod 64 */
 122     index = (unsigned int) ((context->count[0] >> 3) & 0x3F);
 123
 124     /* Update number of bits */
 125     if ((context->count[0] += ((unsigned int) inputLen << 3))
 126         < ((unsigned int) inputLen << 3))
 127         context->count[1]++;
 128     context->count[1] += ((unsigned int) inputLen >> 29);
 129
 130     partLen = 64 - index;
 131
 132     /*
 133      * Transform as many times as possible.
 134      */
 135     if (inputLen >= partLen) {
 136         MD5_memcpy(&context->buffer[index], input, partLen);
 137         MD5Transform(context->state, context->buffer);
 138
 139         for (i = partLen; i + 63 < inputLen; i += 64)
 140             MD5Transform(context->state, &input[i]);
 141
 142         index = 0;
 143     } else
 144         i = 0;
 145
 146     /* Buffer remaining input */
 147     MD5_memcpy(&context->buffer[index], &input[i], inputLen - i);
 148 }
 149
 150 /*
 151  * MD5 finalization. Ends an MD5 message-digest operation, writing the the
 152  * message digest and zeroizing the context.
 153  */
 154 void
 155 MD5Final(unsigned char digest[16], MD5_CTX * context)
 156 {
 157     unsigned char bits[8];
 158     unsigned int index, padLen;
 159
 160     /* Save number of bits */
 161     Encode(bits, context->count, 8);
 162
 163     /*
 164      * Pad out to 56 mod 64.
 165      */
 166     index = (unsigned int) ((context->count[0] >> 3) & 0x3f);
 167     padLen = (index < 56) ? (56 - index) : (120 - index);
 168     MD5Update(context, PADDING, padLen);
 169
 170     /* Append length (before padding) */
 171     MD5Update(context, bits, 8);
 172     /* Store state in digest */
 173     Encode(digest, context->state, 16);
 174
 175     /*
 176      * Zeroize sensitive information.
 177      */
 178     MD5_memset((char *) context, 0, sizeof(*context));
 179 }
 180
 181 /*
 182  * MD5 basic transformation. Transforms state based on block.
 183  */
 184 static void
 185 MD5Transform(unsigned int state[4], unsigned char block[64])
 186 {
 187     unsigned int a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 188
 189     Decode(x, block, 64);
 190
 191     /* Round 1 */
 192     FF(a, b, c, d, x[0], S11, 0xd76aa478);      /* 1 */
 193     FF(d, a, b, c, x[1], S12, 0xe8c7b756);      /* 2 */
 194     FF(c, d, a, b, x[2], S13, 0x242070db);      /* 3 */
 195     FF(b, c, d, a, x[3], S14, 0xc1bdceee);      /* 4 */
 196     FF(a, b, c, d, x[4], S11, 0xf57c0faf);      /* 5 */
 197     FF(d, a, b, c, x[5], S12, 0x4787c62a);      /* 6 */
 198     FF(c, d, a, b, x[6], S13, 0xa8304613);      /* 7 */
 199     FF(b, c, d, a, x[7], S14, 0xfd469501);      /* 8 */
 200     FF(a, b, c, d, x[8], S11, 0x698098d8);      /* 9 */
 201     FF(d, a, b, c, x[9], S12, 0x8b44f7af);      /* 10 */
 202     FF(c, d, a, b, x[10], S13, 0xffff5bb1);     /* 11 */
 203     FF(b, c, d, a, x[11], S14, 0x895cd7be);     /* 12 */
 204     FF(a, b, c, d, x[12], S11, 0x6b901122);     /* 13 */
 205     FF(d, a, b, c, x[13], S12, 0xfd987193);     /* 14 */
 206     FF(c, d, a, b, x[14], S13, 0xa679438e);     /* 15 */
 207     FF(b, c, d, a, x[15], S14, 0x49b40821);     /* 16 */
 208
 209     /* Round 2 */
 210     GG(a, b, c, d, x[1], S21, 0xf61e2562);      /* 17 */
 211     GG(d, a, b, c, x[6], S22, 0xc040b340);      /* 18 */
 212     GG(c, d, a, b, x[11], S23, 0x265e5a51);     /* 19 */
 213     GG(b, c, d, a, x[0], S24, 0xe9b6c7aa);      /* 20 */
 214     GG(a, b, c, d, x[5], S21, 0xd62f105d);      /* 21 */
 215     GG(d, a, b, c, x[10], S22, 0x2441453);      /* 22 */
 216     GG(c, d, a, b, x[15], S23, 0xd8a1e681);     /* 23 */
 217     GG(b, c, d, a, x[4], S24, 0xe7d3fbc8);      /* 24 */
 218     GG(a, b, c, d, x[9], S21, 0x21e1cde6);      /* 25 */
 219     GG(d, a, b, c, x[14], S22, 0xc33707d6);     /* 26 */
 220     GG(c, d, a, b, x[3], S23, 0xf4d50d87);      /* 27 */
 221     GG(b, c, d, a, x[8], S24, 0x455a14ed);      /* 28 */
 222     GG(a, b, c, d, x[13], S21, 0xa9e3e905);     /* 29 */
 223     GG(d, a, b, c, x[2], S22, 0xfcefa3f8);      /* 30 */
 224     GG(c, d, a, b, x[7], S23, 0x676f02d9);      /* 31 */
 225     GG(b, c, d, a, x[12], S24, 0x8d2a4c8a);     /* 32 */
 226
 227     /* Round 3 */
 228     HH(a, b, c, d, x[5], S31, 0xfffa3942);      /* 33 */
 229     HH(d, a, b, c, x[8], S32, 0x8771f681);      /* 34 */
 230     HH(c, d, a, b, x[11], S33, 0x6d9d6122);     /* 35 */
 231     HH(b, c, d, a, x[14], S34, 0xfde5380c);     /* 36 */
 232     HH(a, b, c, d, x[1], S31, 0xa4beea44);      /* 37 */
 233     HH(d, a, b, c, x[4], S32, 0x4bdecfa9);      /* 38 */
 234     HH(c, d, a, b, x[7], S33, 0xf6bb4b60);      /* 39 */
 235     HH(b, c, d, a, x[10], S34, 0xbebfbc70);     /* 40 */
 236     HH(a, b, c, d, x[13], S31, 0x289b7ec6);     /* 41 */
 237     HH(d, a, b, c, x[0], S32, 0xeaa127fa);      /* 42 */
 238     HH(c, d, a, b, x[3], S33, 0xd4ef3085);      /* 43 */
 239     HH(b, c, d, a, x[6], S34, 0x4881d05);       /* 44 */
 240     HH(a, b, c, d, x[9], S31, 0xd9d4d039);      /* 45 */
 241     HH(d, a, b, c, x[12], S32, 0xe6db99e5);     /* 46 */
 242     HH(c, d, a, b, x[15], S33, 0x1fa27cf8);     /* 47 */
 243     HH(b, c, d, a, x[2], S34, 0xc4ac5665);      /* 48 */
 244
 245     /* Round 4 */
 246     II(a, b, c, d, x[0], S41, 0xf4292244);      /* 49 */
 247     II(d, a, b, c, x[7], S42, 0x432aff97);      /* 50 */
 248     II(c, d, a, b, x[14], S43, 0xab9423a7);     /* 51 */
 249     II(b, c, d, a, x[5], S44, 0xfc93a039);      /* 52 */
 250     II(a, b, c, d, x[12], S41, 0x655b59c3);     /* 53 */
 251     II(d, a, b, c, x[3], S42, 0x8f0ccc92);      /* 54 */
 252     II(c, d, a, b, x[10], S43, 0xffeff47d);     /* 55 */
 253     II(b, c, d, a, x[1], S44, 0x85845dd1);      /* 56 */
 254     II(a, b, c, d, x[8], S41, 0x6fa87e4f);      /* 57 */
 255     II(d, a, b, c, x[15], S42, 0xfe2ce6e0);     /* 58 */
 256     II(c, d, a, b, x[6], S43, 0xa3014314);      /* 59 */
 257     II(b, c, d, a, x[13], S44, 0x4e0811a1);     /* 60 */
 258     II(a, b, c, d, x[4], S41, 0xf7537e82);      /* 61 */
 259     II(d, a, b, c, x[11], S42, 0xbd3af235);     /* 62 */
 260     II(c, d, a, b, x[2], S43, 0x2ad7d2bb);      /* 63 */
 261     II(b, c, d, a, x[9], S44, 0xeb86d391);      /* 64 */
 262
 263     state[0] += a;
 264     state[1] += b;
 265     state[2] += c;
 266     state[3] += d;
 267
 268     /*
 269      * Zeroize sensitive information.
 270      */
 271     MD5_memset((char *) x, 0, sizeof(x));
 272 }
 273
 274 /*
 275  * Encodes input (unsigned int) into output (unsigned char). Assumes len is a
 276  * multiple of 4.
 277  */
 278 static void
 279 Encode(unsigned char *output, unsigned int * input, unsigned int len)
 280 {
 281     unsigned int i, j;
 282
 283     for (i = 0, j = 0; j < len; i++, j += 4) {
 284         output[j] = (unsigned char) (input[i] & 0xff);
 285         output[j + 1] = (unsigned char) ((input[i] >> 8) & 0xff);
 286         output[j + 2] = (unsigned char) ((input[i] >> 16) & 0xff);
 287         output[j + 3] = (unsigned char) ((input[i] >> 24) & 0xff);
 288     }
 289 }
 290
 291 /*
 292  * Decodes input (unsigned char) into output (unsigned int). Assumes len is a
 293  * multiple of 4.
 294  */
 295 static void
 296 Decode(unsigned int * output, unsigned char *input, unsigned int len)
 297 {
 298     unsigned int i, j;
 299
 300     for (i = 0, j = 0; j < len; i++, j += 4)
 301         output[i] = ((unsigned int) input[j]) | (((unsigned int) input[j + 1]) << 8) |
 302             (((unsigned int) input[j + 2]) << 16) | (((unsigned int) input[j + 3]) << 24);
 303 }
 304
 305 /*
 306  * Note: Replace "for loop" with standard memcpy if possible.
 307  */
 308
 309 static void
 310 MD5_memcpy(unsigned char *output, unsigned char *input, unsigned int len)
 311 {
 312     unsigned int i;
 313     for (i = 0; i < len; i++)
 314         output[i] = input[i];
 315 }
 316
 317 /*
 318  * Note: Replace "for loop" with standard memset if possible.
 319  */
 320 static void
 321 MD5_memset(char *output, int value, unsigned int len)
 322 {
 323     unsigned int i;
 324     for (i = 0; i < len; i++)
 325         output[i] = (char) value;
 326 }
 327
 328 /*
 329 static void
 330 MDString(char *string, size_t len)
 331 {
 332     MD5_CTX context;
 333     unsigned char digest[16];
 334     MD5Init(&context);
 335     MD5Update(&context, string, len);
 336     MD5Final(digest, &context);
 337     printf("%s\t", string);
 338     MDPrint(digest);
 339     printf("\n");
 340 }
 341 */
 342 /*
 343 static void
 344 MDPrint(unsigned char digest[16])
 345 {
 346     unsigned int i;
 347     for (i = 0; i < 16; i++)
 348         / printf("%02x", digest[i]); *
 349         printf("%c", digest[i]);
 350 }
 351 */
 352