lib/liblwip/netif/ppp/md5.c

   1 /*
   2  ***********************************************************************
   3  ** md5.c -- the source code for MD5 routines                         **
   4  ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
   5  ** Created: 2/17/90 RLR                                              **
   6  ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
   7  ***********************************************************************
   8  */
   9
  10 /*
  11  ***********************************************************************
  12  ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
  13  **                                                                   **
  14  ** License to copy and use this software is granted provided that    **
  15  ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
  16  ** Digest Algorithm" in all material mentioning or referencing this  **
  17  ** software or this function.                                        **
  18  **                                                                   **
  19  ** License is also granted to make and use derivative works          **
  20  ** provided that such works are identified as "derived from the RSA  **
  21  ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
  22  ** material mentioning or referencing the derived work.              **
  23  **                                                                   **
  24  ** RSA Data Security, Inc. makes no representations concerning       **
  25  ** either the merchantability of this software or the suitability    **
  26  ** of this software for any particular purpose.  It is provided "as  **
  27  ** is" without express or implied warranty of any kind.              **
  28  **                                                                   **
  29  ** These notices must be retained in any copies of any part of this  **
  30  ** documentation and/or software.                                    **
  31  ***********************************************************************
  32  */
  33
  34 #include "lwip/opt.h"
  35
  36 #if PPP_SUPPORT /* don't build if not configured for use in lwipopts.h */
  37
  38 #if CHAP_SUPPORT || MD5_SUPPORT
  39
  40 #include "ppp.h"
  41 #include "pppdebug.h"
  42
  43 #include "md5.h"
  44
  45 #include <string.h>
  46
  47 /*
  48  ***********************************************************************
  49  **  Message-digest routines:                                         **
  50  **  To form the message digest for a message M                       **
  51  **    (1) Initialize a context buffer mdContext using MD5Init        **
  52  **    (2) Call MD5Update on mdContext and M                          **
  53  **    (3) Call MD5Final on mdContext                                 **
  54  **  The message digest is now in mdContext->digest[0...15]           **
  55  ***********************************************************************
  56  */
  57
  58 /* forward declaration */
  59 static void Transform (u32_t *buf, u32_t *in);
  60
  61 static unsigned char PADDING[64] = {
  62   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  63   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  64   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  65   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  66   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  67   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  68   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  69   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
  70 };
  71
  72 /* F, G, H and I are basic MD5 functions */
  73 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  74 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  75 #define H(x, y, z) ((x) ^ (y) ^ (z))
  76 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  77
  78 /* ROTATE_LEFT rotates x left n bits */
  79 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  80
  81 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
  82 /* Rotation is separate from addition to prevent recomputation */
  83 #define FF(a, b, c, d, x, s, ac) \
  84   {(a) += F ((b), (c), (d)) + (x) + (u32_t)(ac); \
  85    (a) = ROTATE_LEFT ((a), (s)); \
  86    (a) += (b); \
  87   }
  88 #define GG(a, b, c, d, x, s, ac) \
  89   {(a) += G ((b), (c), (d)) + (x) + (u32_t)(ac); \
  90    (a) = ROTATE_LEFT ((a), (s)); \
  91    (a) += (b); \
  92   }
  93 #define HH(a, b, c, d, x, s, ac) \
  94   {(a) += H ((b), (c), (d)) + (x) + (u32_t)(ac); \
  95    (a) = ROTATE_LEFT ((a), (s)); \
  96    (a) += (b); \
  97   }
  98 #define II(a, b, c, d, x, s, ac) \
  99   {(a) += I ((b), (c), (d)) + (x) + (u32_t)(ac); \
 100    (a) = ROTATE_LEFT ((a), (s)); \
 101    (a) += (b); \
 102   }
 103
 104 #ifdef __STDC__
 105 #define UL(x) x##UL
 106 #else
 107 #ifdef WIN32
 108 #define UL(x) x##UL
 109 #else
 110 #define UL(x) x
 111 #endif
 112 #endif
 113
 114 /* The routine MD5Init initializes the message-digest context
 115    mdContext. All fields are set to zero.
 116  */
 117 void
 118 MD5Init (MD5_CTX *mdContext)
 119 {
 120   mdContext->i[0] = mdContext->i[1] = (u32_t)0;
 121
 122   /* Load magic initialization constants. */
 123   mdContext->buf[0] = (u32_t)0x67452301UL;
 124   mdContext->buf[1] = (u32_t)0xefcdab89UL;
 125   mdContext->buf[2] = (u32_t)0x98badcfeUL;
 126   mdContext->buf[3] = (u32_t)0x10325476UL;
 127 }
 128
 129 /* The routine MD5Update updates the message-digest context to
 130    account for the presence of each of the characters inBuf[0..inLen-1]
 131    in the message whose digest is being computed.
 132  */
 133 void
 134 MD5Update(MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
 135 {
 136   u32_t in[16];
 137   int mdi;
 138   unsigned int i, ii;
 139
 140 #if 0
 141   PPPDEBUG(LOG_INFO, ("MD5Update: %u:%.*H\n", inLen, LWIP_MIN(inLen, 20) * 2, inBuf));
 142   PPPDEBUG(LOG_INFO, ("MD5Update: %u:%s\n", inLen, inBuf));
 143 #endif
 144
 145   /* compute number of bytes mod 64 */
 146   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 147
 148   /* update number of bits */
 149   if ((mdContext->i[0] + ((u32_t)inLen << 3)) < mdContext->i[0]) {
 150     mdContext->i[1]++;
 151   }
 152   mdContext->i[0] += ((u32_t)inLen << 3);
 153   mdContext->i[1] += ((u32_t)inLen >> 29);
 154
 155   while (inLen--) {
 156     /* add new character to buffer, increment mdi */
 157     mdContext->in[mdi++] = *inBuf++;
 158
 159     /* transform if necessary */
 160     if (mdi == 0x40) {
 161       for (i = 0, ii = 0; i < 16; i++, ii += 4) {
 162         in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
 163                 (((u32_t)mdContext->in[ii+2]) << 16) |
 164                 (((u32_t)mdContext->in[ii+1]) << 8)  |
 165                 ((u32_t)mdContext->in[ii]);
 166       }
 167       Transform (mdContext->buf, in);
 168       mdi = 0;
 169     }
 170   }
 171 }
 172
 173 /* The routine MD5Final terminates the message-digest computation and
 174    ends with the desired message digest in mdContext->digest[0...15].
 175  */
 176 void
 177 MD5Final (unsigned char hash[], MD5_CTX *mdContext)
 178 {
 179   u32_t in[16];
 180   int mdi;
 181   unsigned int i, ii;
 182   unsigned int padLen;
 183
 184   /* save number of bits */
 185   in[14] = mdContext->i[0];
 186   in[15] = mdContext->i[1];
 187
 188   /* compute number of bytes mod 64 */
 189   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 190
 191   /* pad out to 56 mod 64 */
 192   padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
 193   MD5Update (mdContext, PADDING, padLen);
 194
 195   /* append length in bits and transform */
 196   for (i = 0, ii = 0; i < 14; i++, ii += 4) {
 197     in[i] = (((u32_t)mdContext->in[ii+3]) << 24) |
 198             (((u32_t)mdContext->in[ii+2]) << 16) |
 199             (((u32_t)mdContext->in[ii+1]) << 8)  |
 200             ((u32_t)mdContext->in[ii]);
 201   }
 202   Transform (mdContext->buf, in);
 203
 204   /* store buffer in digest */
 205   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
 206     mdContext->digest[ii]   = (unsigned char)(mdContext->buf[i] & 0xFF);
 207     mdContext->digest[ii+1] =
 208       (unsigned char)((mdContext->buf[i] >> 8)  & 0xFF);
 209     mdContext->digest[ii+2] =
 210       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
 211     mdContext->digest[ii+3] =
 212       (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
 213   }
 214   SMEMCPY(hash, mdContext->digest, 16);
 215 }
 216
 217 /* Basic MD5 step. Transforms buf based on in.
 218  */
 219 static void
 220 Transform (u32_t *buf, u32_t *in)
 221 {
 222   u32_t a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 223
 224   /* Round 1 */
 225 #define S11 7
 226 #define S12 12
 227 #define S13 17
 228 #define S14 22
 229   FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
 230   FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
 231   FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
 232   FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
 233   FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
 234   FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
 235   FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
 236   FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
 237   FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
 238   FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
 239   FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
 240   FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
 241   FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
 242   FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
 243   FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
 244   FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
 245
 246   /* Round 2 */
 247 #define S21 5
 248 #define S22 9
 249 #define S23 14
 250 #define S24 20
 251   GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
 252   GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
 253   GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
 254   GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
 255   GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
 256   GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
 257   GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
 258   GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
 259   GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
 260   GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
 261   GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
 262   GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
 263   GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
 264   GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
 265   GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
 266   GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
 267
 268   /* Round 3 */
 269 #define S31 4
 270 #define S32 11
 271 #define S33 16
 272 #define S34 23
 273   HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
 274   HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
 275   HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
 276   HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
 277   HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
 278   HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
 279   HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
 280   HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
 281   HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
 282   HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
 283   HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
 284   HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
 285   HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
 286   HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
 287   HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
 288   HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
 289
 290   /* Round 4 */
 291 #define S41 6
 292 #define S42 10
 293 #define S43 15
 294 #define S44 21
 295   II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
 296   II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
 297   II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
 298   II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
 299   II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
 300   II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
 301   II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
 302   II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
 303   II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
 304   II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
 305   II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
 306   II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
 307   II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
 308   II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
 309   II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
 310   II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
 311
 312   buf[0] += a;
 313   buf[1] += b;
 314   buf[2] += c;
 315   buf[3] += d;
 316 }
 317
 318 #endif /* CHAP_SUPPORT || MD5_SUPPORT */
 319
 320 #endif /* PPP_SUPPORT */