usr/src/common/crypto/md4/md4.c

   1 /*
   2  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
   3  * Use is subject to license terms.
   4  */
   5
   6 /*
   7  * MD4C.C - RSA Data Security, Inc., MD4 message-digest algorithm
   8  */
   9
  10 /*
  11  * Copyright (C) 1990-2, RSA Data Security, Inc. All rights reserved.
  12  *
  13  * License to copy and use this software is granted provided that it
  14  * is identified as the "RSA Data Security, Inc. MD4 Message-Digest
  15  * Algorithm" in all material mentioning or referencing this software
  16  * or this function.
  17  *
  18  * License is also granted to make and use derivative works provided
  19  * that such works are identified as "derived from the RSA Data
  20  * Security, Inc. MD4 Message-Digest Algorithm" in all material
  21  * mentioning or referencing the derived work.
  22  *
  23  * RSA Data Security, Inc. makes no representations concerning either
  24  * the merchantability of this software or the suitability of this
  25  * software for any particular purpose. It is provided "as is"
  26  * without express or implied warranty of any kind.
  27  *
  28  * These notices must be retained in any copies of any part of this
  29  * documentation and/or software.
  30  */
  31
  32 #include <sys/types.h>
  33 #ifdef _KERNEL
  34 #include <sys/sunddi.h>
  35 #else
  36 #include <strings.h>
  37 #endif /* _KERNEL */
  38
  39 #if defined(__i386) || defined(__amd64)
  40 #define UNALIGNED_POINTERS_PERMITTED
  41 #endif
  42
  43 #include <sys/md4.h>
  44
  45 /*
  46  * Constants for MD4Transform routine.
  47  */
  48 #define S11 3
  49 #define S12 7
  50 #define S13 11
  51 #define S14 19
  52 #define S21 3
  53 #define S22 5
  54 #define S23 9
  55 #define S24 13
  56 #define S31 3
  57 #define S32 9
  58 #define S33 11
  59 #define S34 15
  60
  61 static void MD4Transform(uint32_t [4], unsigned char [64]);
  62 static void Encode(unsigned char *, uint32_t *, unsigned int);
  63 static void Decode(uint32_t *, unsigned char *, unsigned int);
  64
  65 static unsigned char PADDING[64] = {
  66         0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  67         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  68         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  69 };
  70
  71 /*
  72  * F, G and H are basic MD4 functions.
  73  */
  74 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
  75 #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
  76 #define H(x, y, z) ((x) ^ (y) ^ (z))
  77
  78 /*
  79  * ROTATE_LEFT rotates x left n bits.
  80  */
  81 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
  82
  83 /* FF, GG and HH are transformations for rounds 1, 2 and 3 */
  84 /* Rotation is separate from addition to prevent recomputation */
  85
  86 #define FF(a, b, c, d, x, s) { \
  87                 (a) += F((b), (c), (d)) + (x); \
  88                 (a) = ROTATE_LEFT((a), (s)); \
  89         }
  90 #define GG(a, b, c, d, x, s) { \
  91                 (a) += G((b), (c), (d)) + (x) + (uint32_t)0x5a827999; \
  92                 (a) = ROTATE_LEFT((a), (s)); \
  93         }
  94 #define HH(a, b, c, d, x, s) { \
  95                 (a) += H((b), (c), (d)) + (x) + (uint32_t)0x6ed9eba1; \
  96                 (a) = ROTATE_LEFT((a), (s)); \
  97         }
  98
  99 /*
 100  * MD4 initialization. Begins an MD4 operation, writing a new context.
 101  */
 102 void
 103 MD4Init(MD4_CTX *context)
 104 {
 105         context->count[0] = context->count[1] = 0;
 106
 107         /*
 108          * Load magic initialization constants.
 109          */
 110         context->state[0] = 0x67452301UL;
 111         context->state[1] = 0xefcdab89UL;
 112         context->state[2] = 0x98badcfeUL;
 113         context->state[3] = 0x10325476UL;
 114 }
 115
 116
 117 /*
 118  * MD4 block update operation. Continues an MD4 message-digest
 119  * operation, processing another message block, and updating the
 120  * context.
 121  */
 122 void
 123 MD4Update(MD4_CTX *context, const void *_RESTRICT_KYWD inptr, size_t inputLen)
 124 {
 125         unsigned int i, index, partLen;
 126         uchar_t *input = (uchar_t *)inptr;
 127
 128         /* Compute number of bytes mod 64 */
 129         index = (unsigned int)((context->count[0] >> 3) & 0x3F);
 130         /* Update number of bits */
 131         if ((context->count[0] += ((uint32_t)inputLen << 3))
 132             < ((uint32_t)inputLen << 3))
 133                 context->count[1]++;
 134         context->count[1] += ((uint32_t)inputLen >> 29);
 135
 136         partLen = 64 - index;
 137
 138         /*
 139          * Transform as many times as possible.
 140          */
 141         if (inputLen >= partLen) {
 142                 bcopy(input, &context->buffer[index], partLen);
 143                 MD4Transform(context->state, (uchar_t *)context->buffer);
 144
 145                 for (i = partLen; i + 63 < inputLen; i += 64) {
 146                         MD4Transform(context->state, (uchar_t *)&input[i]);
 147                 }
 148
 149                 index = 0;
 150         } else {
 151                 i = 0;
 152         }
 153
 154         /* Buffer remaining input */
 155         bcopy(&input[i], &context->buffer[index], inputLen - i);
 156 }
 157
 158 /*
 159  * MD4 finalization. Ends an MD4 message-digest operation, writing the
 160  *      the message digest and zeroizing the context.
 161  */
 162 void
 163 MD4Final(void *digest, MD4_CTX *context)
 164 {
 165         unsigned char bits[8];
 166         unsigned int index, padLen;
 167
 168         /* Save number of bits */
 169         Encode(bits, context->count, 8);
 170
 171         /*
 172          * Pad out to 56 mod 64.
 173          */
 174         index = (unsigned int)((context->count[0] >> 3) & 0x3f);
 175         padLen = (index < 56) ? (56 - index) : (120 - index);
 176         MD4Update(context, PADDING, padLen);
 177
 178         /* Append length (before padding) */
 179         MD4Update(context, bits, 8);
 180         /* Store state in digest */
 181         Encode(digest, context->state, 16);
 182
 183         /* zeroize sensitive information */
 184         bzero(context, sizeof (*context));
 185 }
 186
 187 /*
 188  * MD4 basic transformation. Transforms state based on block.
 189  */
 190 static void
 191 MD4Transform(uint32_t state[4], unsigned char block[64])
 192 {
 193         uint32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
 194
 195
 196         Decode(x, block, 64);
 197
 198         /* Round 1 */
 199         FF(a, b, c, d, x[ 0], S11); /* 1 */
 200         FF(d, a, b, c, x[ 1], S12); /* 2 */
 201         FF(c, d, a, b, x[ 2], S13); /* 3 */
 202         FF(b, c, d, a, x[ 3], S14); /* 4 */
 203         FF(a, b, c, d, x[ 4], S11); /* 5 */
 204         FF(d, a, b, c, x[ 5], S12); /* 6 */
 205         FF(c, d, a, b, x[ 6], S13); /* 7 */
 206         FF(b, c, d, a, x[ 7], S14); /* 8 */
 207         FF(a, b, c, d, x[ 8], S11); /* 9 */
 208         FF(d, a, b, c, x[ 9], S12); /* 10 */
 209         FF(c, d, a, b, x[10], S13); /* 11 */
 210         FF(b, c, d, a, x[11], S14); /* 12 */
 211         FF(a, b, c, d, x[12], S11); /* 13 */
 212         FF(d, a, b, c, x[13], S12); /* 14 */
 213         FF(c, d, a, b, x[14], S13); /* 15 */
 214         FF(b, c, d, a, x[15], S14); /* 16 */
 215
 216         /* Round 2 */
 217         GG(a, b, c, d, x[ 0], S21); /* 17 */
 218         GG(d, a, b, c, x[ 4], S22); /* 18 */
 219         GG(c, d, a, b, x[ 8], S23); /* 19 */
 220         GG(b, c, d, a, x[12], S24); /* 20 */
 221         GG(a, b, c, d, x[ 1], S21); /* 21 */
 222         GG(d, a, b, c, x[ 5], S22); /* 22 */
 223         GG(c, d, a, b, x[ 9], S23); /* 23 */
 224         GG(b, c, d, a, x[13], S24); /* 24 */
 225         GG(a, b, c, d, x[ 2], S21); /* 25 */
 226         GG(d, a, b, c, x[ 6], S22); /* 26 */
 227         GG(c, d, a, b, x[10], S23); /* 27 */
 228         GG(b, c, d, a, x[14], S24); /* 28 */
 229         GG(a, b, c, d, x[ 3], S21); /* 29 */
 230         GG(d, a, b, c, x[ 7], S22); /* 30 */
 231         GG(c, d, a, b, x[11], S23); /* 31 */
 232         GG(b, c, d, a, x[15], S24); /* 32 */
 233
 234
 235         /* Round 3 */
 236         HH(a, b, c, d, x[ 0], S31); /* 33 */
 237         HH(d, a, b, c, x[ 8], S32); /* 34 */
 238         HH(c, d, a, b, x[ 4], S33); /* 35 */
 239         HH(b, c, d, a, x[12], S34); /* 36 */
 240         HH(a, b, c, d, x[ 2], S31); /* 37 */
 241         HH(d, a, b, c, x[10], S32); /* 38 */
 242         HH(c, d, a, b, x[ 6], S33); /* 39 */
 243         HH(b, c, d, a, x[14], S34); /* 40 */
 244         HH(a, b, c, d, x[ 1], S31); /* 41 */
 245         HH(d, a, b, c, x[ 9], S32); /* 42 */
 246         HH(c, d, a, b, x[ 5], S33); /* 43 */
 247         HH(b, c, d, a, x[13], S34); /* 44 */
 248         HH(a, b, c, d, x[ 3], S31); /* 45 */
 249         HH(d, a, b, c, x[11], S32); /* 46 */
 250         HH(c, d, a, b, x[ 7], S33); /* 47 */
 251         HH(b, c, d, a, x[15], S34); /* 48 */
 252
 253         state[0] += a;
 254         state[1] += b;
 255         state[2] += c;
 256         state[3] += d;
 257
 258         /* zeroize sensitive information */
 259         bzero(x, sizeof (*x));
 260 }
 261
 262 /*
 263  * Encodes input (uint32_t) into output (unsigned char). Assumes len is
 264  * a multiple of 4.
 265  */
 266 static void
 267 Encode(unsigned char *output, uint32_t *input, unsigned int len)
 268 {
 269         unsigned int i, j;
 270
 271         for (i = 0, j = 0; j < len; i++, j += 4) {
 272 #if defined(_LITTLE_ENDIAN) && defined(UNALIGNED_POINTERS_PERMITTED)
 273                 *(uint32_t *)(void *)&output[j] = input[i];
 274 #else
 275                 /* endian-independent code */
 276                 output[j] = (unsigned char)(input[i] & 0xff);
 277                 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
 278                 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
 279                 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
 280 #endif  /* _LITTLE_ENDIAN && UNALIGNED_POINTERS_PERMITTED */
 281         }
 282 }
 283
 284 /*
 285  * Decodes input (unsigned char) into output (uint32_t). Assumes len is
 286  * a multiple of 4.
 287  */
 288 static void
 289 Decode(uint32_t *output, unsigned char *input, unsigned int len)
 290 {
 291         unsigned int i, j;
 292
 293         for (i = 0, j = 0; j < len; i++, j += 4) {
 294 #if defined(_LITTLE_ENDIAN) && defined(UNALIGNED_POINTERS_PERMITTED)
 295                 output[i] = *(uint32_t *)(void *)&input[j];
 296 #else
 297                 /* endian-independent code */
 298                 output[i] = ((uint32_t)input[j]) |
 299                     (((uint32_t)input[j+1]) << 8) |
 300                     (((uint32_t)input[j+2]) << 16) |
 301                     (((uint32_t)input[j+3]) << 24);
 302 #endif  /* _LITTLE_ENDIAN && UNALIGNED_POINTERS_PERMITTED */
 303         }
 304
 305 }