package/system/mtd/src/md5.c

   1
   2
   3 /*
   4  ***********************************************************************
   5  ** md5.c -- the source code for MD5 routines                         **
   6  ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
   7  ** Created: 2/17/90 RLR                                              **
   8  ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
   9  ***********************************************************************
  10  */
  11
  12 /*
  13  ***********************************************************************
  14  ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
  15  **                                                                   **
  16  ** License to copy and use this software is granted provided that    **
  17  ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
  18  ** Digest Algorithm" in all material mentioning or referencing this  **
  19  ** software or this function.                                        **
  20  **                                                                   **
  21  ** License is also granted to make and use derivative works          **
  22  ** provided that such works are identified as "derived from the RSA  **
  23  ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
  24  ** material mentioning or referencing the derived work.              **
  25  **                                                                   **
  26  ** RSA Data Security, Inc. makes no representations concerning       **
  27  ** either the merchantability of this software or the suitability    **
  28  ** of this software for any particular purpose.  It is provided "as  **
  29  ** is" without express or implied warranty of any kind.              **
  30  **                                                                   **
  31  ** These notices must be retained in any copies of any part of this  **
  32  ** documentation and/or software.                                    **
  33  ***********************************************************************
  34  */
  35
  36 #include <string.h>
  37 #include "md5.h"
  38
  39 /*
  40  ***********************************************************************
  41  **  Message-digest routines:                                         **
  42  **  To form the message digest for a message M                       **
  43  **    (1) Initialize a context buffer mdContext using MD5_Init       **
  44  **    (2) Call MD5_Update on mdContext and M                         **
  45  **    (3) Call MD5_Final on mdContext                                **
  46  **  The message digest is now in mdContext->digest[0...15]           **
  47  ***********************************************************************
  48  */
  49
  50 /* forward declaration */
  51 static void Transform ();
  52
  53 static unsigned char PADDING[64] = {
  54   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  55   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  56   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  57   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  58   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  59   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  60   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  61   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  62 };
  63
  64 /* F, G, H and I are basic MD5 functions */
  65 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  66 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  67 #define H(x, y, z) ((x) ^ (y) ^ (z))
  68 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  69
  70 /* ROTATE_LEFT rotates x left n bits */
  71 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  72
  73 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
  74 /* Rotation is separate from addition to prevent recomputation */
  75 #define FF(a, b, c, d, x, s, ac) \
  76   {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  77    (a) = ROTATE_LEFT ((a), (s)); \
  78    (a) += (b); \
  79   }
  80 #define GG(a, b, c, d, x, s, ac) \
  81   {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  82    (a) = ROTATE_LEFT ((a), (s)); \
  83    (a) += (b); \
  84   }
  85 #define HH(a, b, c, d, x, s, ac) \
  86   {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  87    (a) = ROTATE_LEFT ((a), (s)); \
  88    (a) += (b); \
  89   }
  90 #define II(a, b, c, d, x, s, ac) \
  91   {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  92    (a) = ROTATE_LEFT ((a), (s)); \
  93    (a) += (b); \
  94   }
  95
  96 #ifdef __STDC__
  97 #define UL(x)   x##U
  98 #else
  99 #define UL(x)   x
 100 #endif
 101
 102 /* The routine MD5_Init initializes the message-digest context
 103    mdContext. All fields are set to zero.
 104  */
 105 void MD5_Init (mdContext)
 106 MD5_CTX *mdContext;
 107 {
 108   mdContext->i[0] = mdContext->i[1] = (UINT4)0;
 109
 110   /* Load magic initialization constants.
 111    */
 112   mdContext->buf[0] = (UINT4)0x67452301;
 113   mdContext->buf[1] = (UINT4)0xefcdab89;
 114   mdContext->buf[2] = (UINT4)0x98badcfe;
 115   mdContext->buf[3] = (UINT4)0x10325476;
 116 }
 117
 118 /* The routine MD5Update updates the message-digest context to
 119    account for the presence of each of the characters inBuf[0..inLen-1]
 120    in the message whose digest is being computed.
 121  */
 122 void MD5_Update (mdContext, inBuf, inLen)
 123 MD5_CTX *mdContext;
 124 unsigned char *inBuf;
 125 unsigned int inLen;
 126 {
 127   UINT4 in[16];
 128   int mdi;
 129   unsigned int i, ii;
 130
 131   /* compute number of bytes mod 64 */
 132   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 133
 134   /* update number of bits */
 135   if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
 136     mdContext->i[1]++;
 137   mdContext->i[0] += ((UINT4)inLen << 3);
 138   mdContext->i[1] += ((UINT4)inLen >> 29);
 139
 140   while (inLen--) {
 141     /* add new character to buffer, increment mdi */
 142     mdContext->in[mdi++] = *inBuf++;
 143
 144     /* transform if necessary */
 145     if (mdi == 0x40) {
 146       for (i = 0, ii = 0; i < 16; i++, ii += 4)
 147         in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 148                 (((UINT4)mdContext->in[ii+2]) << 16) |
 149                 (((UINT4)mdContext->in[ii+1]) << 8) |
 150                 ((UINT4)mdContext->in[ii]);
 151       Transform (mdContext->buf, in);
 152       mdi = 0;
 153     }
 154   }
 155 }
 156
 157 /* The routine MD5Final terminates the message-digest computation and
 158    ends with the desired message digest in mdContext->digest[0...15].
 159  */
 160 void MD5_Final (hash, mdContext)
 161 unsigned char hash[];
 162 MD5_CTX *mdContext;
 163 {
 164   UINT4 in[16];
 165   int mdi;
 166   unsigned int i, ii;
 167   unsigned int padLen;
 168
 169   /* save number of bits */
 170   in[14] = mdContext->i[0];
 171   in[15] = mdContext->i[1];
 172
 173   /* compute number of bytes mod 64 */
 174   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 175
 176   /* pad out to 56 mod 64 */
 177   padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
 178   MD5_Update (mdContext, PADDING, padLen);
 179
 180   /* append length in bits and transform */
 181   for (i = 0, ii = 0; i < 14; i++, ii += 4)
 182     in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 183             (((UINT4)mdContext->in[ii+2]) << 16) |
 184             (((UINT4)mdContext->in[ii+1]) << 8) |
 185             ((UINT4)mdContext->in[ii]);
 186   Transform (mdContext->buf, in);
 187
 188   /* store buffer in digest */
 189   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
 190     mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
 191     mdContext->digest[ii+1] =
 192       (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
 193     mdContext->digest[ii+2] =
 194       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
 195     mdContext->digest[ii+3] =
 196       (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
 197   }
 198   memcpy(hash, mdContext->digest, 16);
 199 }
 200
 201 /* Basic MD5 step. Transforms buf based on in.
 202  */
 203 static void Transform (buf, in)
 204 UINT4 *buf;
 205 UINT4 *in;
 206 {
 207   UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 208
 209   /* Round 1 */
 210 #define S11 7
 211 #define S12 12
 212 #define S13 17
 213 #define S14 22
 214   FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
 215   FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
 216   FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
 217   FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
 218   FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
 219   FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
 220   FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
 221   FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
 222   FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
 223   FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
 224   FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
 225   FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
 226   FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
 227   FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
 228   FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
 229   FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
 230
 231   /* Round 2 */
 232 #define S21 5
 233 #define S22 9
 234 #define S23 14
 235 #define S24 20
 236   GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
 237   GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
 238   GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
 239   GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
 240   GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
 241   GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
 242   GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
 243   GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
 244   GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
 245   GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
 246   GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
 247   GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
 248   GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
 249   GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
 250   GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
 251   GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
 252
 253   /* Round 3 */
 254 #define S31 4
 255 #define S32 11
 256 #define S33 16
 257 #define S34 23
 258   HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
 259   HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
 260   HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
 261   HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
 262   HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
 263   HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
 264   HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
 265   HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
 266   HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
 267   HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
 268   HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
 269   HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
 270   HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
 271   HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
 272   HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
 273   HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
 274
 275   /* Round 4 */
 276 #define S41 6
 277 #define S42 10
 278 #define S43 15
 279 #define S44 21
 280   II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
 281   II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
 282   II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
 283   II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
 284   II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
 285   II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
 286   II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
 287   II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
 288   II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
 289   II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
 290   II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
 291   II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
 292   II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
 293   II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
 294   II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
 295   II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
 296
 297   buf[0] += a;
 298   buf[1] += b;
 299   buf[2] += c;
 300   buf[3] += d;
 301 }
 302
 303 /*
 304  ***********************************************************************
 305  ** End of md5.c                                                      **
 306  ******************************** (cut) ********************************
 307  */