dist/ipf/md5.c

   1 /*      $NetBSD$        */
   2
   3
   4
   5 /*
   6  ***********************************************************************
   7  ** md5.c -- the source code for MD5 routines                         **
   8  ** RSA Data Security, Inc. MD5 Message-Digest Algorithm              **
   9  ** Created: 2/17/90 RLR                                              **
  10  ** Revised: 1/91 SRD,AJ,BSK,JT Reference C ver., 7/10 constant corr. **
  11  ***********************************************************************
  12  */
  13
  14 /*
  15  ***********************************************************************
  16  ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.  **
  17  **                                                                   **
  18  ** License to copy and use this software is granted provided that    **
  19  ** it is identified as the "RSA Data Security, Inc. MD5 Message-     **
  20  ** Digest Algorithm" in all material mentioning or referencing this  **
  21  ** software or this function.                                        **
  22  **                                                                   **
  23  ** License is also granted to make and use derivative works          **
  24  ** provided that such works are identified as "derived from the RSA  **
  25  ** Data Security, Inc. MD5 Message-Digest Algorithm" in all          **
  26  ** material mentioning or referencing the derived work.              **
  27  **                                                                   **
  28  ** RSA Data Security, Inc. makes no representations concerning       **
  29  ** either the merchantability of this software or the suitability    **
  30  ** of this software for any particular purpose.  It is provided "as  **
  31  ** is" without express or implied warranty of any kind.              **
  32  **                                                                   **
  33  ** These notices must be retained in any copies of any part of this  **
  34  ** documentation and/or software.                                    **
  35  ***********************************************************************
  36  */
  37
  38 #if defined(_KERNEL) && !defined(__sgi)
  39 # include <sys/systm.h>
  40 #else
  41 # include <string.h>
  42 #endif
  43
  44 #include "md5.h"
  45
  46 /*
  47  ***********************************************************************
  48  **  Message-digest routines:                                         **
  49  **  To form the message digest for a message M                       **
  50  **    (1) Initialize a context buffer mdContext using MD5Init        **
  51  **    (2) Call MD5Update on mdContext and M                          **
  52  **    (3) Call MD5Final on mdContext                                 **
  53  **  The message digest is now in mdContext->digest[0...15]           **
  54  ***********************************************************************
  55  */
  56
  57 /* forward declaration */
  58 static void Transform __P((UINT4 *, UINT4 *));
  59
  60 static unsigned char PADDING[64] = {
  61   0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
  62   0x00, 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 };
  70
  71 /* F, G, H and I are basic MD5 functions */
  72 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  73 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  74 #define H(x, y, z) ((x) ^ (y) ^ (z))
  75 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  76
  77 /* ROTATE_LEFT rotates x left n bits */
  78 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  79
  80 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
  81 /* Rotation is separate from addition to prevent recomputation */
  82 #define FF(a, b, c, d, x, s, ac) \
  83   {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  84    (a) = ROTATE_LEFT ((a), (s)); \
  85    (a) += (b); \
  86   }
  87 #define GG(a, b, c, d, x, s, ac) \
  88   {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  89    (a) = ROTATE_LEFT ((a), (s)); \
  90    (a) += (b); \
  91   }
  92 #define HH(a, b, c, d, x, s, ac) \
  93   {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  94    (a) = ROTATE_LEFT ((a), (s)); \
  95    (a) += (b); \
  96   }
  97 #define II(a, b, c, d, x, s, ac) \
  98   {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  99    (a) = ROTATE_LEFT ((a), (s)); \
 100    (a) += (b); \
 101   }
 102
 103 #ifdef __STDC__
 104 #define UL(x)   x##U
 105 #else
 106 #define UL(x)   x
 107 #endif
 108
 109 /* The routine MD5Init initializes the message-digest context
 110    mdContext. All fields are set to zero.
 111  */
 112 void MD5Init (mdContext)
 113 MD5_CTX *mdContext;
 114 {
 115   mdContext->i[0] = mdContext->i[1] = (UINT4)0;
 116
 117   /* Load magic initialization constants.
 118    */
 119   mdContext->buf[0] = (UINT4)0x67452301;
 120   mdContext->buf[1] = (UINT4)0xefcdab89;
 121   mdContext->buf[2] = (UINT4)0x98badcfe;
 122   mdContext->buf[3] = (UINT4)0x10325476;
 123 }
 124
 125 /* The routine MD5Update updates the message-digest context to
 126    account for the presence of each of the characters inBuf[0..inLen-1]
 127    in the message whose digest is being computed.
 128  */
 129 void MD5Update (mdContext, inBuf, inLen)
 130 MD5_CTX *mdContext;
 131 unsigned char *inBuf;
 132 unsigned int inLen;
 133 {
 134   UINT4 in[16];
 135   int mdi;
 136   unsigned int i, ii;
 137
 138   /* compute number of bytes mod 64 */
 139   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 140
 141   /* update number of bits */
 142   if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
 143     mdContext->i[1]++;
 144   mdContext->i[0] += ((UINT4)inLen << 3);
 145   mdContext->i[1] += ((UINT4)inLen >> 29);
 146
 147   while (inLen--) {
 148     /* add new character to buffer, increment mdi */
 149     mdContext->in[mdi++] = *inBuf++;
 150
 151     /* transform if necessary */
 152     if (mdi == 0x40) {
 153       for (i = 0, ii = 0; i < 16; i++, ii += 4)
 154         in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 155                 (((UINT4)mdContext->in[ii+2]) << 16) |
 156                 (((UINT4)mdContext->in[ii+1]) << 8) |
 157                 ((UINT4)mdContext->in[ii]);
 158       Transform (mdContext->buf, in);
 159       mdi = 0;
 160     }
 161   }
 162 }
 163
 164 /* The routine MD5Final terminates the message-digest computation and
 165    ends with the desired message digest in mdContext->digest[0...15].
 166  */
 167 void MD5Final (hash, mdContext)
 168 unsigned char hash[];
 169 MD5_CTX *mdContext;
 170 {
 171   UINT4 in[16];
 172   int mdi;
 173   unsigned int i, ii;
 174   unsigned int padLen;
 175
 176   /* save number of bits */
 177   in[14] = mdContext->i[0];
 178   in[15] = mdContext->i[1];
 179
 180   /* compute number of bytes mod 64 */
 181   mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 182
 183   /* pad out to 56 mod 64 */
 184   padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
 185   MD5Update (mdContext, PADDING, padLen);
 186
 187   /* append length in bits and transform */
 188   for (i = 0, ii = 0; i < 14; i++, ii += 4)
 189     in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 190             (((UINT4)mdContext->in[ii+2]) << 16) |
 191             (((UINT4)mdContext->in[ii+1]) << 8) |
 192             ((UINT4)mdContext->in[ii]);
 193   Transform (mdContext->buf, in);
 194
 195   /* store buffer in digest */
 196   for (i = 0, ii = 0; i < 4; i++, ii += 4) {
 197     mdContext->digest[ii] = (unsigned char)(mdContext->buf[i] & 0xFF);
 198     mdContext->digest[ii+1] =
 199       (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
 200     mdContext->digest[ii+2] =
 201       (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
 202     mdContext->digest[ii+3] =
 203       (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
 204   }
 205   bcopy((char *)mdContext->digest, (char *)hash, 16);
 206 }
 207
 208 /* Basic MD5 step. Transforms buf based on in.
 209  */
 210 static void Transform (buf, in)
 211 UINT4 *buf;
 212 UINT4 *in;
 213 {
 214   UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 215
 216   /* Round 1 */
 217 #define S11 7
 218 #define S12 12
 219 #define S13 17
 220 #define S14 22
 221   FF ( a, b, c, d, in[ 0], S11, UL(3614090360)); /* 1 */
 222   FF ( d, a, b, c, in[ 1], S12, UL(3905402710)); /* 2 */
 223   FF ( c, d, a, b, in[ 2], S13, UL( 606105819)); /* 3 */
 224   FF ( b, c, d, a, in[ 3], S14, UL(3250441966)); /* 4 */
 225   FF ( a, b, c, d, in[ 4], S11, UL(4118548399)); /* 5 */
 226   FF ( d, a, b, c, in[ 5], S12, UL(1200080426)); /* 6 */
 227   FF ( c, d, a, b, in[ 6], S13, UL(2821735955)); /* 7 */
 228   FF ( b, c, d, a, in[ 7], S14, UL(4249261313)); /* 8 */
 229   FF ( a, b, c, d, in[ 8], S11, UL(1770035416)); /* 9 */
 230   FF ( d, a, b, c, in[ 9], S12, UL(2336552879)); /* 10 */
 231   FF ( c, d, a, b, in[10], S13, UL(4294925233)); /* 11 */
 232   FF ( b, c, d, a, in[11], S14, UL(2304563134)); /* 12 */
 233   FF ( a, b, c, d, in[12], S11, UL(1804603682)); /* 13 */
 234   FF ( d, a, b, c, in[13], S12, UL(4254626195)); /* 14 */
 235   FF ( c, d, a, b, in[14], S13, UL(2792965006)); /* 15 */
 236   FF ( b, c, d, a, in[15], S14, UL(1236535329)); /* 16 */
 237
 238   /* Round 2 */
 239 #define S21 5
 240 #define S22 9
 241 #define S23 14
 242 #define S24 20
 243   GG ( a, b, c, d, in[ 1], S21, UL(4129170786)); /* 17 */
 244   GG ( d, a, b, c, in[ 6], S22, UL(3225465664)); /* 18 */
 245   GG ( c, d, a, b, in[11], S23, UL( 643717713)); /* 19 */
 246   GG ( b, c, d, a, in[ 0], S24, UL(3921069994)); /* 20 */
 247   GG ( a, b, c, d, in[ 5], S21, UL(3593408605)); /* 21 */
 248   GG ( d, a, b, c, in[10], S22, UL(  38016083)); /* 22 */
 249   GG ( c, d, a, b, in[15], S23, UL(3634488961)); /* 23 */
 250   GG ( b, c, d, a, in[ 4], S24, UL(3889429448)); /* 24 */
 251   GG ( a, b, c, d, in[ 9], S21, UL( 568446438)); /* 25 */
 252   GG ( d, a, b, c, in[14], S22, UL(3275163606)); /* 26 */
 253   GG ( c, d, a, b, in[ 3], S23, UL(4107603335)); /* 27 */
 254   GG ( b, c, d, a, in[ 8], S24, UL(1163531501)); /* 28 */
 255   GG ( a, b, c, d, in[13], S21, UL(2850285829)); /* 29 */
 256   GG ( d, a, b, c, in[ 2], S22, UL(4243563512)); /* 30 */
 257   GG ( c, d, a, b, in[ 7], S23, UL(1735328473)); /* 31 */
 258   GG ( b, c, d, a, in[12], S24, UL(2368359562)); /* 32 */
 259
 260   /* Round 3 */
 261 #define S31 4
 262 #define S32 11
 263 #define S33 16
 264 #define S34 23
 265   HH ( a, b, c, d, in[ 5], S31, UL(4294588738)); /* 33 */
 266   HH ( d, a, b, c, in[ 8], S32, UL(2272392833)); /* 34 */
 267   HH ( c, d, a, b, in[11], S33, UL(1839030562)); /* 35 */
 268   HH ( b, c, d, a, in[14], S34, UL(4259657740)); /* 36 */
 269   HH ( a, b, c, d, in[ 1], S31, UL(2763975236)); /* 37 */
 270   HH ( d, a, b, c, in[ 4], S32, UL(1272893353)); /* 38 */
 271   HH ( c, d, a, b, in[ 7], S33, UL(4139469664)); /* 39 */
 272   HH ( b, c, d, a, in[10], S34, UL(3200236656)); /* 40 */
 273   HH ( a, b, c, d, in[13], S31, UL( 681279174)); /* 41 */
 274   HH ( d, a, b, c, in[ 0], S32, UL(3936430074)); /* 42 */
 275   HH ( c, d, a, b, in[ 3], S33, UL(3572445317)); /* 43 */
 276   HH ( b, c, d, a, in[ 6], S34, UL(  76029189)); /* 44 */
 277   HH ( a, b, c, d, in[ 9], S31, UL(3654602809)); /* 45 */
 278   HH ( d, a, b, c, in[12], S32, UL(3873151461)); /* 46 */
 279   HH ( c, d, a, b, in[15], S33, UL( 530742520)); /* 47 */
 280   HH ( b, c, d, a, in[ 2], S34, UL(3299628645)); /* 48 */
 281
 282   /* Round 4 */
 283 #define S41 6
 284 #define S42 10
 285 #define S43 15
 286 #define S44 21
 287   II ( a, b, c, d, in[ 0], S41, UL(4096336452)); /* 49 */
 288   II ( d, a, b, c, in[ 7], S42, UL(1126891415)); /* 50 */
 289   II ( c, d, a, b, in[14], S43, UL(2878612391)); /* 51 */
 290   II ( b, c, d, a, in[ 5], S44, UL(4237533241)); /* 52 */
 291   II ( a, b, c, d, in[12], S41, UL(1700485571)); /* 53 */
 292   II ( d, a, b, c, in[ 3], S42, UL(2399980690)); /* 54 */
 293   II ( c, d, a, b, in[10], S43, UL(4293915773)); /* 55 */
 294   II ( b, c, d, a, in[ 1], S44, UL(2240044497)); /* 56 */
 295   II ( a, b, c, d, in[ 8], S41, UL(1873313359)); /* 57 */
 296   II ( d, a, b, c, in[15], S42, UL(4264355552)); /* 58 */
 297   II ( c, d, a, b, in[ 6], S43, UL(2734768916)); /* 59 */
 298   II ( b, c, d, a, in[13], S44, UL(1309151649)); /* 60 */
 299   II ( a, b, c, d, in[ 4], S41, UL(4149444226)); /* 61 */
 300   II ( d, a, b, c, in[11], S42, UL(3174756917)); /* 62 */
 301   II ( c, d, a, b, in[ 2], S43, UL( 718787259)); /* 63 */
 302   II ( b, c, d, a, in[ 9], S44, UL(3951481745)); /* 64 */
 303
 304   buf[0] += a;
 305   buf[1] += b;
 306   buf[2] += c;
 307   buf[3] += d;
 308 }
 309
 310 /*
 311  ***********************************************************************
 312  ** End of md5.c                                                      **
 313  ******************************** (cut) ********************************
 314  */