sys/kern/md4c.c

   1 /* MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
   2  * $FreeBSD: src/sys/kern/md4c.c,v 1.1.2.1 2001/05/22 08:32:32 bp Exp $
   3  * $DragonFly: src/sys/kern/md4c.c,v 1.3 2006/12/23 23:47:54 swildner Exp $
   4  */
   5
   6 /* Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
   7
   8    License to copy and use this software is granted provided that it
   9    is identified as the "RSA Data Security, Inc. MD4 Message-Digest
  10    Algorithm" in all material mentioning or referencing this software
  11    or this function.
  12
  13    License is also granted to make and use derivative works provided
  14    that such works are identified as "derived from the RSA Data
  15    Security, Inc. MD4 Message-Digest Algorithm" in all material
  16    mentioning or referencing the derived work.
  17
  18    RSA Data Security, Inc. makes no representations concerning either
  19    the merchantability of this software or the suitability of this
  20    software for any particular purpose. It is provided "as is"
  21    without express or implied warranty of any kind.
  22
  23    These notices must be retained in any copies of any part of this
  24    documentation and/or software.
  25  */
  26
  27 #include <sys/param.h>
  28 #include <sys/systm.h>
  29 #include <sys/md4.h>
  30
  31 typedef unsigned char *POINTER;
  32 typedef u_int16_t UINT2;
  33 typedef u_int32_t UINT4;
  34
  35 #define PROTO_LIST(list) list
  36
  37 /* Constants for MD4Transform routine.
  38  */
  39 #define S11 3
  40 #define S12 7
  41 #define S13 11
  42 #define S14 19
  43 #define S21 3
  44 #define S22 5
  45 #define S23 9
  46 #define S24 13
  47 #define S31 3
  48 #define S32 9
  49 #define S33 11
  50 #define S34 15
  51
  52 static void MD4Transform PROTO_LIST ((UINT4 [4], const unsigned char [64]));
  53 static void Encode PROTO_LIST
  54   ((unsigned char *, UINT4 *, unsigned int));
  55 static void Decode PROTO_LIST
  56   ((UINT4 *, const unsigned char *, unsigned int));
  57
  58 static unsigned char PADDING[64] = {
  59   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  60   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  61   0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  62 };
  63
  64 /* F, G and H are basic MD4 functions.
  65  */
  66 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  67 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  68 #define H(x, y, z) ((x) ^ (y) ^ (z))
  69
  70 /* ROTATE_LEFT rotates x left n bits.
  71  */
  72 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  73
  74 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
  75 /* Rotation is separate from addition to prevent recomputation */
  76 #define FF(a, b, c, d, x, s) { \
  77     (a) += F ((b), (c), (d)) + (x); \
  78     (a) = ROTATE_LEFT ((a), (s)); \
  79   }
  80 #define GG(a, b, c, d, x, s) { \
  81     (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \
  82     (a) = ROTATE_LEFT ((a), (s)); \
  83   }
  84 #define HH(a, b, c, d, x, s) { \
  85     (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \
  86     (a) = ROTATE_LEFT ((a), (s)); \
  87   }
  88
  89 /* MD4 initialization. Begins an MD4 operation, writing a new context.
  90  */
  91 void
  92 MD4Init(MD4_CTX *context)
  93 {
  94   context->count[0] = context->count[1] = 0;
  95
  96   /* Load magic initialization constants.
  97    */
  98   context->state[0] = 0x67452301;
  99   context->state[1] = 0xefcdab89;
 100   context->state[2] = 0x98badcfe;
 101   context->state[3] = 0x10325476;
 102 }
 103
 104 /* MD4 block update operation. Continues an MD4 message-digest
 105  *    operation, processing another message block, and updating the
 106  *    context.
 107  *
 108  * Parameters:
 109  *      input:          input block
 110  *      inputLen:       length of input block
 111  */
 112 void
 113 MD4Update(MD4_CTX *context, const unsigned char *input, unsigned int inputLen)
 114 {
 115   unsigned int i, index, partLen;
 116
 117   /* Compute number of bytes mod 64 */
 118   index = (unsigned int)((context->count[0] >> 3) & 0x3F);
 119   /* Update number of bits */
 120   if ((context->count[0] += ((UINT4)inputLen << 3))
 121       < ((UINT4)inputLen << 3))
 122     context->count[1]++;
 123   context->count[1] += ((UINT4)inputLen >> 29);
 124
 125   partLen = 64 - index;
 126   /* Transform as many times as possible.
 127    */
 128   if (inputLen >= partLen) {
 129     bcopy(input, &context->buffer[index], partLen);
 130     MD4Transform (context->state, context->buffer);
 131
 132     for (i = partLen; i + 63 < inputLen; i += 64)
 133       MD4Transform (context->state, &input[i]);
 134
 135     index = 0;
 136   }
 137   else
 138     i = 0;
 139
 140   /* Buffer remaining input */
 141   bcopy(&input[i], &context->buffer[index], inputLen-i);
 142 }
 143
 144 /* MD4 padding. */
 145 void
 146 MD4Pad(MD4_CTX *context)
 147 {
 148   unsigned char bits[8];
 149   unsigned int index, padLen;
 150
 151   /* Save number of bits */
 152   Encode (bits, context->count, 8);
 153
 154   /* Pad out to 56 mod 64.
 155    */
 156   index = (unsigned int)((context->count[0] >> 3) & 0x3f);
 157   padLen = (index < 56) ? (56 - index) : (120 - index);
 158   MD4Update (context, PADDING, padLen);
 159
 160   /* Append length (before padding) */
 161   MD4Update (context, bits, 8);
 162 }
 163
 164 /* MD4 finalization. Ends an MD4 message-digest operation, writing the
 165  *    the message digest and zeroizing the context.
 166  *
 167  * Parameters:
 168  *      digest: message digest
 169  */
 170 void
 171 MD4Final(unsigned char digest[16], MD4_CTX *context)
 172 {
 173   /* Do padding */
 174   MD4Pad (context);
 175
 176   /* Store state in digest */
 177   Encode (digest, context->state, 16);
 178
 179   /* Zeroize sensitive information.
 180    */
 181   bzero((POINTER)context, sizeof (*context));
 182 }
 183
 184 /* MD4 basic transformation. Transforms state based on block.
 185  */
 186 static void
 187 MD4Transform(UINT4 state[4], const unsigned char block[64])
 188 {
 189   UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 190
 191   Decode (x, block, 64);
 192
 193   /* Round 1 */
 194   FF (a, b, c, d, x[ 0], S11); /* 1 */
 195   FF (d, a, b, c, x[ 1], S12); /* 2 */
 196   FF (c, d, a, b, x[ 2], S13); /* 3 */
 197   FF (b, c, d, a, x[ 3], S14); /* 4 */
 198   FF (a, b, c, d, x[ 4], S11); /* 5 */
 199   FF (d, a, b, c, x[ 5], S12); /* 6 */
 200   FF (c, d, a, b, x[ 6], S13); /* 7 */
 201   FF (b, c, d, a, x[ 7], S14); /* 8 */
 202   FF (a, b, c, d, x[ 8], S11); /* 9 */
 203   FF (d, a, b, c, x[ 9], S12); /* 10 */
 204   FF (c, d, a, b, x[10], S13); /* 11 */
 205   FF (b, c, d, a, x[11], S14); /* 12 */
 206   FF (a, b, c, d, x[12], S11); /* 13 */
 207   FF (d, a, b, c, x[13], S12); /* 14 */
 208   FF (c, d, a, b, x[14], S13); /* 15 */
 209   FF (b, c, d, a, x[15], S14); /* 16 */
 210
 211   /* Round 2 */
 212   GG (a, b, c, d, x[ 0], S21); /* 17 */
 213   GG (d, a, b, c, x[ 4], S22); /* 18 */
 214   GG (c, d, a, b, x[ 8], S23); /* 19 */
 215   GG (b, c, d, a, x[12], S24); /* 20 */
 216   GG (a, b, c, d, x[ 1], S21); /* 21 */
 217   GG (d, a, b, c, x[ 5], S22); /* 22 */
 218   GG (c, d, a, b, x[ 9], S23); /* 23 */
 219   GG (b, c, d, a, x[13], S24); /* 24 */
 220   GG (a, b, c, d, x[ 2], S21); /* 25 */
 221   GG (d, a, b, c, x[ 6], S22); /* 26 */
 222   GG (c, d, a, b, x[10], S23); /* 27 */
 223   GG (b, c, d, a, x[14], S24); /* 28 */
 224   GG (a, b, c, d, x[ 3], S21); /* 29 */
 225   GG (d, a, b, c, x[ 7], S22); /* 30 */
 226   GG (c, d, a, b, x[11], S23); /* 31 */
 227   GG (b, c, d, a, x[15], S24); /* 32 */
 228
 229   /* Round 3 */
 230   HH (a, b, c, d, x[ 0], S31); /* 33 */
 231   HH (d, a, b, c, x[ 8], S32); /* 34 */
 232   HH (c, d, a, b, x[ 4], S33); /* 35 */
 233   HH (b, c, d, a, x[12], S34); /* 36 */
 234   HH (a, b, c, d, x[ 2], S31); /* 37 */
 235   HH (d, a, b, c, x[10], S32); /* 38 */
 236   HH (c, d, a, b, x[ 6], S33); /* 39 */
 237   HH (b, c, d, a, x[14], S34); /* 40 */
 238   HH (a, b, c, d, x[ 1], S31); /* 41 */
 239   HH (d, a, b, c, x[ 9], S32); /* 42 */
 240   HH (c, d, a, b, x[ 5], S33); /* 43 */
 241   HH (b, c, d, a, x[13], S34); /* 44 */
 242   HH (a, b, c, d, x[ 3], S31); /* 45 */
 243   HH (d, a, b, c, x[11], S32); /* 46 */
 244   HH (c, d, a, b, x[ 7], S33); /* 47 */
 245   HH (b, c, d, a, x[15], S34); /* 48 */
 246
 247   state[0] += a;
 248   state[1] += b;
 249   state[2] += c;
 250   state[3] += d;
 251
 252   /* Zeroize sensitive information.
 253    */
 254   bzero((POINTER)x, sizeof (x));
 255 }
 256
 257 /* Encodes input (UINT4) into output (unsigned char). Assumes len is
 258      a multiple of 4.
 259  */
 260 static void
 261 Encode(unsigned char *output, UINT4 *input, unsigned int len)
 262 {
 263   unsigned int i, j;
 264
 265   for (i = 0, j = 0; j < len; i++, j += 4) {
 266     output[j] = (unsigned char)(input[i] & 0xff);
 267     output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 268     output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 269     output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
 270   }
 271 }
 272
 273 /* Decodes input (unsigned char) into output (UINT4). Assumes len is
 274      a multiple of 4.
 275  */
 276 static void
 277 Decode(UINT4 *output, const unsigned char *input, unsigned int len)
 278 {
 279   unsigned int i, j;
 280
 281   for (i = 0, j = 0; j < len; i++, j += 4)
 282     output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
 283       (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
 284 }