usr/src/lib/gss_mechs/mech_dh/backend/crypto/md5.c

   1 /*
   2  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 #pragma ident   "%Z%%M% %I%     %E% SMI"
   7
   8 #include "md5.h"
   9
  10 /*
  11 **************************************************************************
  12 ** md5.c -- the source code for MD5 routines                            **
  13 ** RSA Data Security, Inc. MD5 Message-Digest Algorithm                 **
  14 ** Created: 2/17/90 RLR                                                 **
  15 ** Revised: 1/91 SRD, AJ, BSK, JT Reference C ver., 7/10 constant corr. **
  16 **************************************************************************
  17 */
  18
  19 /*
  20 **************************************************************************
  21 ** Copyright (C) 1990, RSA Data Security, Inc. All rights reserved.     **
  22 **                                                                      **
  23 ** License to copy and use this software is granted provided that       **
  24 ** it is identified as the "RSA Data Security, Inc. MD5 Message-        **
  25 ** Digest Algorithm" in all material mentioning or referencing this     **
  26 ** software or this function.                                           **
  27 **                                                                      **
  28 ** License is also granted to make and use derivative works             **
  29 ** provided that such works are identified as "derived from the RSA     **
  30 ** Data Security, Inc. MD5 Message-Digest Algorithm" in all             **
  31 ** material mentioning or referencing the derived work.                 **
  32 **                                                                      **
  33 ** RSA Data Security, Inc. makes no representations concerning          **
  34 ** either the merchantability of this software or the suitability       **
  35 ** of this software for any particular purpose.  It is provided "as     **
  36 ** is" without express or implied warranty of any kind.                 **
  37 **                                                                      **
  38 ** These notices must be retained in any copies of any part of this     **
  39 ** documentation and/or software.                                       **
  40 **************************************************************************
  41 */
  42
  43
  44 /*
  45 **************************************************************************
  46 **  Message-digest routines:                                            **
  47 **  To form the message digest for a message M                          **
  48 **    (1) Initialize a context buffer mdContext using MD5Init           **
  49 **    (2) Call MD5Update on mdContext and M                             **
  50 **    (3) Call MD5Final on mdContext                                    **
  51 **  The message digest is now in mdContext->digest[0...15]              **
  52 **************************************************************************
  53 */
  54
  55 /* forward declaration */
  56 static void Transform (UINT4 *buf, UINT4 *in);
  57
  58 static unsigned char PADDING[64] = {
  59         0x80, 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         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         };
  68
  69 /* F, G, H and I are basic MD5 functions */
  70 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  71 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
  72 #define H(x, y, z) ((x) ^ (y) ^ (z))
  73 #define I(x, y, z) ((y) ^ ((x) | (~z)))
  74
  75 /* ROTATE_LEFT rotates x left n bits */
  76 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  77
  78 /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4 */
  79 /* Rotation is separate from addition to prevent recomputation */
  80 #define FF(a, b, c, d, x, s, ac) \
  81         {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
  82         (a) = ROTATE_LEFT ((a), (s)); \
  83         (a) += (b); \
  84         }
  85 #define GG(a, b, c, d, x, s, ac) \
  86         {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
  87         (a) = ROTATE_LEFT ((a), (s)); \
  88         (a) += (b); \
  89         }
  90 #define HH(a, b, c, d, x, s, ac) \
  91         {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
  92         (a) = ROTATE_LEFT ((a), (s)); \
  93         (a) += (b); \
  94         }
  95 #define II(a, b, c, d, x, s, ac) \
  96         {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
  97         (a) = ROTATE_LEFT ((a), (s)); \
  98         (a) += (b); \
  99         }
 100
 101 /*
 102 * The routine MD5Init initializes the message-digest context
 103 * mdContext. All fields are set to zero.
 104 */
 105 void MD5Init (MD5_CTX *mdContext)
 106 {
 107         mdContext->i[0] = mdContext->i[1] = (UINT4)0;
 108
 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 /*
 119 * The routine MD5Update updates the message-digest context to
 120 * account for the presence of each of the characters inBuf[0..inLen-1]
 121 * in the message whose digest is being computed.
 122 */
 123 void MD5Update (MD5_CTX *mdContext, unsigned char *inBuf, unsigned int inLen)
 124 {
 125         UINT4 in[16];
 126         int mdi;
 127         unsigned int i, ii;
 128
 129         /* compute number of bytes mod 64 */
 130         mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 131
 132         /* update number of bits */
 133         if ((mdContext->i[0] + ((UINT4)inLen << 3)) < mdContext->i[0])
 134                 mdContext->i[1]++;
 135         mdContext->i[0] += ((UINT4)inLen << 3);
 136         mdContext->i[1] += ((UINT4)inLen >> 29);
 137
 138         while (inLen--) {
 139                 /* add new character to buffer, increment mdi */
 140                 mdContext->in[mdi++] = *inBuf++;
 141
 142                 /* transform if necessary */
 143                 if (mdi == 0x40) {
 144                         for (i = 0, ii = 0; i < 16; i++, ii += 4)
 145                                 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 146                                         (((UINT4)mdContext->in[ii+2]) << 16) |
 147                                         (((UINT4)mdContext->in[ii+1]) << 8) |
 148                                         ((UINT4)mdContext->in[ii]);
 149                         Transform (mdContext->buf, in);
 150                         mdi = 0;
 151                 }
 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 (MD5_CTX *mdContext)
 160 {
 161         UINT4 in[16];
 162         int mdi;
 163         unsigned int i, ii;
 164         unsigned int padLen;
 165
 166         /* save number of bits */
 167         in[14] = mdContext->i[0];
 168         in[15] = mdContext->i[1];
 169
 170         /* compute number of bytes mod 64 */
 171         mdi = (int)((mdContext->i[0] >> 3) & 0x3F);
 172
 173         /* pad out to 56 mod 64 */
 174         padLen = (mdi < 56) ? (56 - mdi) : (120 - mdi);
 175         MD5Update (mdContext, PADDING, padLen);
 176
 177         /* append length in bits and transform */
 178         for (i = 0, ii = 0; i < 14; i++, ii += 4)
 179                 in[i] = (((UINT4)mdContext->in[ii+3]) << 24) |
 180                         (((UINT4)mdContext->in[ii+2]) << 16) |
 181                         (((UINT4)mdContext->in[ii+1]) << 8) |
 182                         ((UINT4)mdContext->in[ii]);
 183                         Transform (mdContext->buf, in);
 184
 185         /* store buffer in digest */
 186         for (i = 0, ii = 0; i < 4; i++, ii += 4) {
 187                 mdContext->digest[ii] =
 188                                 (unsigned char)(mdContext->buf[i] & 0xFF);
 189                 mdContext->digest[ii+1] =
 190                         (unsigned char)((mdContext->buf[i] >> 8) & 0xFF);
 191                 mdContext->digest[ii+2] =
 192                         (unsigned char)((mdContext->buf[i] >> 16) & 0xFF);
 193                 mdContext->digest[ii+3] =
 194                         (unsigned char)((mdContext->buf[i] >> 24) & 0xFF);
 195         }
 196 }
 197
 198 /*
 199 * Basic MD5 step. Transforms buf based on in.
 200 */
 201 static void Transform (UINT4 *buf, UINT4 *in)
 202 {
 203         UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
 204
 205 /* Round 1 */
 206 #define S11     7
 207 #define S12     12
 208 #define S13     17
 209 #define S14     22
 210         FF (a, b, c, d, in[ 0], S11, 3614090360U); /* 1 */
 211         FF (d, a, b, c, in[ 1], S12, 3905402710U); /* 2 */
 212         FF (c, d, a, b, in[ 2], S13,  606105819U); /* 3 */
 213         FF (b, c, d, a, in[ 3], S14, 3250441966U); /* 4 */
 214         FF (a, b, c, d, in[ 4], S11, 4118548399U); /* 5 */
 215         FF (d, a, b, c, in[ 5], S12, 1200080426U); /* 6 */
 216         FF (c, d, a, b, in[ 6], S13, 2821735955U); /* 7 */
 217         FF (b, c, d, a, in[ 7], S14, 4249261313U); /* 8 */
 218         FF (a, b, c, d, in[ 8], S11, 1770035416U); /* 9 */
 219         FF (d, a, b, c, in[ 9], S12, 2336552879U); /* 10 */
 220         FF (c, d, a, b, in[10], S13, 4294925233U); /* 11 */
 221         FF (b, c, d, a, in[11], S14, 2304563134U); /* 12 */
 222         FF (a, b, c, d, in[12], S11, 1804603682U); /* 13 */
 223         FF (d, a, b, c, in[13], S12, 4254626195U); /* 14 */
 224         FF (c, d, a, b, in[14], S13, 2792965006U); /* 15 */
 225         FF (b, c, d, a, in[15], S14, 1236535329U); /* 16 */
 226
 227 /* Round 2 */
 228 #define S21     5
 229 #define S22     9
 230 #define S23     14
 231 #define S24     20
 232         GG (a, b, c, d, in[ 1], S21, 4129170786U); /* 17 */
 233         GG (d, a, b, c, in[ 6], S22, 3225465664U); /* 18 */
 234         GG (c, d, a, b, in[11], S23,  643717713U); /* 19 */
 235         GG (b, c, d, a, in[ 0], S24, 3921069994U); /* 20 */
 236         GG (a, b, c, d, in[ 5], S21, 3593408605U); /* 21 */
 237         GG (d, a, b, c, in[10], S22,   38016083U); /* 22 */
 238         GG (c, d, a, b, in[15], S23, 3634488961U); /* 23 */
 239         GG (b, c, d, a, in[ 4], S24, 3889429448U); /* 24 */
 240         GG (a, b, c, d, in[ 9], S21,  568446438U); /* 25 */
 241         GG (d, a, b, c, in[14], S22, 3275163606U); /* 26 */
 242         GG (c, d, a, b, in[ 3], S23, 4107603335U); /* 27 */
 243         GG (b, c, d, a, in[ 8], S24, 1163531501U); /* 28 */
 244         GG (a, b, c, d, in[13], S21, 2850285829U); /* 29 */
 245         GG (d, a, b, c, in[ 2], S22, 4243563512U); /* 30 */
 246         GG (c, d, a, b, in[ 7], S23, 1735328473U); /* 31 */
 247         GG (b, c, d, a, in[12], S24, 2368359562U); /* 32 */
 248
 249 /* Round 3 */
 250 #define S31     4
 251 #define S32     11
 252 #define S33     16
 253 #define S34     23
 254         HH (a, b, c, d, in[ 5], S31, 4294588738U); /* 33 */
 255         HH (d, a, b, c, in[ 8], S32, 2272392833U); /* 34 */
 256         HH (c, d, a, b, in[11], S33, 1839030562U); /* 35 */
 257         HH (b, c, d, a, in[14], S34, 4259657740U); /* 36 */
 258         HH (a, b, c, d, in[ 1], S31, 2763975236U); /* 37 */
 259         HH (d, a, b, c, in[ 4], S32, 1272893353U); /* 38 */
 260         HH (c, d, a, b, in[ 7], S33, 4139469664U); /* 39 */
 261         HH (b, c, d, a, in[10], S34, 3200236656U); /* 40 */
 262         HH (a, b, c, d, in[13], S31,  681279174U); /* 41 */
 263         HH (d, a, b, c, in[ 0], S32, 3936430074U); /* 42 */
 264         HH (c, d, a, b, in[ 3], S33, 3572445317U); /* 43 */
 265         HH (b, c, d, a, in[ 6], S34,   76029189U); /* 44 */
 266         HH (a, b, c, d, in[ 9], S31, 3654602809U); /* 45 */
 267         HH (d, a, b, c, in[12], S32, 3873151461U); /* 46 */
 268         HH (c, d, a, b, in[15], S33,  530742520U); /* 47 */
 269         HH (b, c, d, a, in[ 2], S34, 3299628645U); /* 48 */
 270
 271 /* Round 4 */
 272 #define S41     6
 273 #define S42     10
 274 #define S43     15
 275 #define S44     21
 276         II (a, b, c, d, in[ 0], S41, 4096336452U); /* 49 */
 277         II (d, a, b, c, in[ 7], S42, 1126891415U); /* 50 */
 278         II (c, d, a, b, in[14], S43, 2878612391U); /* 51 */
 279         II (b, c, d, a, in[ 5], S44, 4237533241U); /* 52 */
 280         II (a, b, c, d, in[12], S41, 1700485571U); /* 53 */
 281         II (d, a, b, c, in[ 3], S42, 2399980690U); /* 54 */
 282         II (c, d, a, b, in[10], S43, 4293915773U); /* 55 */
 283         II (b, c, d, a, in[ 1], S44, 2240044497U); /* 56 */
 284         II (a, b, c, d, in[ 8], S41, 1873313359U); /* 57 */
 285         II (d, a, b, c, in[15], S42, 4264355552U); /* 58 */
 286         II (c, d, a, b, in[ 6], S43, 2734768916U); /* 59 */
 287         II (b, c, d, a, in[13], S44, 1309151649U); /* 60 */
 288         II (a, b, c, d, in[ 4], S41, 4149444226U); /* 61 */
 289         II (d, a, b, c, in[11], S42, 3174756917U); /* 62 */
 290         II (c, d, a, b, in[ 2], S43,  718787259U); /* 63 */
 291         II (b, c, d, a, in[ 9], S44, 3951481745U); /* 64 */
 292
 293         buf[0] += a;
 294         buf[1] += b;
 295         buf[2] += c;
 296         buf[3] += d;
 297 }