pppd/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 "md5.h"
  37
  38 /*
  39  ***********************************************************************
  40  **  Message-digest routines:                                         **
  41  **  To form the message digest for a message M                       **
  42  **    (1) Initialize a context buffer mdContext using MD5Init        **
  43  **    (2) Call MD5Update on mdContext and M                          **
  44  **    (3) Call MD5Final on mdContext                                 **
  45  **  The message digest is now in mdContext->digest[0...15]           **
  46  ***********************************************************************
  47  */
  48
  49 /* forward declaration */
  50 static void Transform ();
  51
  52 static unsigned char PADDING[64] = {
  53   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  54   0x00, 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 };
  62
  63 /* F, G, H and I are basic MD5 functions */
  64 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  65 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  66 #define H(x, y, z) ((x) ^ (y) ^ (z))
  67 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  68
  69 /* ROTATE_LEFT rotates x left n bits */
  70 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  71
  72 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
  73 /* Rotation is separate from addition to prevent recomputation */
  74 #define FF(a, b, c, d, x, s, ac) \
  75   {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  76    (a) = ROTATE_LEFT ((a), (s)); \
  77    (a) += (b); \
  78   }
  79 #define GG(a, b, c, d, x, s, ac) \
  80   {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  81    (a) = ROTATE_LEFT ((a), (s)); \
  82    (a) += (b); \
  83   }
  84 #define HH(a, b, c, d, x, s, ac) \
  85   {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  86    (a) = ROTATE_LEFT ((a), (s)); \
  87    (a) += (b); \
  88   }
  89 #define II(a, b, c, d, x, s, ac) \
  90   {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  91    (a) = ROTATE_LEFT ((a), (s)); \
  92    (a) += (b); \
  93   }
  94
  95 #ifdef __STDC__
  96 #define UL(x)   x##U
  97 #else
  98 #define UL(x)   x
  99 #endif
 100
 101 /* The routine MD5Init initializes the message-digest context
 102    mdContext. All fields are set to zero.
 103  */
 104 void MD5Init (mdContext)
 105 MD5_CTX *mdContext;
 106 {
 107   mdContext->i[0] = mdContext->i[1] = (UINT4)0;
 108
 109   /* Load magic initialization constants.
 110    */
 111   mdContext->buf[0] = (UINT4)0x67452301;
 112   mdContext->buf[1] = (UINT4)0xefcdab89;
 113   mdContext->buf[2] = (UINT4)0x98badcfe;
 114   mdContext->buf[3] = (UINT4)0x10325476;
 115 }
 116
 117 /* The routine MD5Update updates the message-digest context to
 118    account for the presence of each of the characters inBuf[0..inLen-1]
 119    in the message whose digest is being computed.
 120  */
 121 void MD5Update (mdContext, inBuf, inLen)
 122 MD5_CTX *mdContext;
 123 unsigned char *inBuf;
 124 unsigned int inLen;
 125 {
 126   UINT4 in[16];
 127   int mdi;
 128   unsigned int i, ii;
 129
 130   /* compute number of bytes mod 64 */
 131   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 132
 133   /* update number of bits */
 134   if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
 135     mdContext->i[1]++;
 136   mdContext->i[0] += ((UINT4)inLen << 3);
 137   mdContext->i[1] += ((UINT4)inLen >> 29);
 138
 139   while (inLen--) {
 140     /* add new character to buffer, increment mdi */
 141     mdContext->in[mdi++] = *inBuf++;
 142
 143     /* transform if necessary */
 144     if (mdi == 0x40) {
 145       for (i = 0, ii = 0; i < 16; i++, ii += 4)
 146         in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 147                 (((UINT4)mdContext->in[ii+2]) << 16) |
 148                 (((UINT4)mdContext->in[ii+1]) << 8) |
 149                 ((UINT4)mdContext->in[ii]);
 150       Transform (mdContext->buf, in);
 151       mdi = 0;
 152     }
 153   }
 154 }
 155
 156 /* The routine MD5Final terminates the message-digest computation and
 157    ends with the desired message digest in mdContext->digest[0...15].
 158  */
 159 void MD5Final (hash, mdContext)
 160 unsigned char hash[];
 161 MD5_CTX *mdContext;
 162 {
 163   UINT4 in[16];
 164   int mdi;
 165   unsigned int i, ii;
 166   unsigned int padLen;
 167
 168   /* save number of bits */
 169   in[14] = mdContext->i[0];
 170   in[15] = mdContext->i[1];
 171
 172   /* compute number of bytes mod 64 */
 173   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 174
 175   /* pad out to 56 mod 64 */
 176   padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
 177   MD5Update (mdContext, PADDING, padLen);
 178
 179   /* append length in bits and transform */
 180   for (i = 0, ii = 0; i < 14; i++, ii += 4)
 181     in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 182             (((UINT4)mdContext->in[ii+2]) << 16) |
 183             (((UINT4)mdContext->in[ii+1]) << 8) |
 184             ((UINT4)mdContext->in[ii]);
 185   Transform (mdContext->buf, in);
 186
 187   /* store buffer in digest */
 188   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
 189     mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
 190     mdContext->digest[ii+1] =
 191       (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
 192     mdContext->digest[ii+2] =
 193       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
 194     mdContext->digest[ii+3] =
 195       (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
 196   }
 197   memcpy(hash, mdContext->digest, 16);
 198 }
 199
 200 /* Basic MD5 step. Transforms buf based on in.
 201  */
 202 static void Transform (buf, in)
 203 UINT4 *buf;
 204 UINT4 *in;
 205 {
 206   UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 207
 208   /* Round 1 */
 209 #define S11 7
 210 #define S12 12
 211 #define S13 17
 212 #define S14 22
 213   FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
 214   FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
 215   FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
 216   FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
 217   FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
 218   FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
 219   FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
 220   FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
 221   FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
 222   FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
 223   FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
 224   FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
 225   FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
 226   FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
 227   FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
 228   FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
 229
 230   /* Round 2 */
 231 #define S21 5
 232 #define S22 9
 233 #define S23 14
 234 #define S24 20
 235   GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
 236   GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
 237   GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
 238   GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
 239   GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
 240   GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
 241   GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
 242   GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
 243   GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
 244   GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
 245   GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
 246   GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
 247   GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
 248   GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
 249   GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
 250   GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
 251
 252   /* Round 3 */
 253 #define S31 4
 254 #define S32 11
 255 #define S33 16
 256 #define S34 23
 257   HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
 258   HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
 259   HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
 260   HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
 261   HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
 262   HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
 263   HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
 264   HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
 265   HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
 266   HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
 267   HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
 268   HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
 269   HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
 270   HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
 271   HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
 272   HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
 273
 274   /* Round 4 */
 275 #define S41 6
 276 #define S42 10
 277 #define S43 15
 278 #define S44 21
 279   II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
 280   II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
 281   II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
 282   II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
 283   II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
 284   II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
 285   II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
 286   II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
 287   II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
 288   II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
 289   II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
 290   II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
 291   II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
 292   II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
 293   II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
 294   II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
 295
 296   buf[0] += a;
 297   buf[1] += b;
 298   buf[2] += c;
 299   buf[3] += d;
 300 }
 301
 302 /*
 303  ***********************************************************************
 304  ** End of md5.c                                                      **
 305  ******************************** (cut) ********************************
 306  */