contrib/hostapd/md4.c

   1 /*
   2  * MD4 hash implementation
   3  * Copyright (c) 2006, Jouni Malinen <j@w1.fi>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundation.
   8  *
   9  * Alternatively, this software may be distributed under the terms of BSD
  10  * license.
  11  *
  12  * See README and COPYING for more details.
  13  */
  14
  15 #include "includes.h"
  16
  17 #include "common.h"
  18 #include "crypto.h"
  19
  20
  21 #ifdef INTERNAL_MD4
  22
  23 #define MD4_BLOCK_LENGTH                64
  24 #define MD4_DIGEST_LENGTH               16
  25
  26 typedef struct MD4Context {
  27         u32 state[4];                   /* state */
  28         u64 count;                      /* number of bits, mod 2^64 */
  29         u8 buffer[MD4_BLOCK_LENGTH];    /* input buffer */
  30 } MD4_CTX;
  31
  32
  33 static void MD4Init(MD4_CTX *ctx);
  34 static void MD4Update(MD4_CTX *ctx, const unsigned char *input, size_t len);
  35 static void MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx);
  36
  37
  38 void md4_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac)
  39 {
  40         MD4_CTX ctx;
  41         size_t i;
  42
  43         MD4Init(&ctx);
  44         for (i = 0; i < num_elem; i++)
  45                 MD4Update(&ctx, addr[i], len[i]);
  46         MD4Final(mac, &ctx);
  47 }
  48
  49
  50 /* ===== start - public domain MD4 implementation ===== */
  51 /*      $OpenBSD: md4.c,v 1.7 2005/08/08 08:05:35 espie Exp $   */
  52
  53 /*
  54  * This code implements the MD4 message-digest algorithm.
  55  * The algorithm is due to Ron Rivest.  This code was
  56  * written by Colin Plumb in 1993, no copyright is claimed.
  57  * This code is in the public domain; do with it what you wish.
  58  * Todd C. Miller modified the MD5 code to do MD4 based on RFC 1186.
  59  *
  60  * Equivalent code is available from RSA Data Security, Inc.
  61  * This code has been tested against that, and is equivalent,
  62  * except that you don't need to include two pages of legalese
  63  * with every copy.
  64  *
  65  * To compute the message digest of a chunk of bytes, declare an
  66  * MD4Context structure, pass it to MD4Init, call MD4Update as
  67  * needed on buffers full of bytes, and then call MD4Final, which
  68  * will fill a supplied 16-byte array with the digest.
  69  */
  70
  71 #define MD4_DIGEST_STRING_LENGTH        (MD4_DIGEST_LENGTH * 2 + 1)
  72
  73
  74 static void
  75 MD4Transform(u32 state[4], const u8 block[MD4_BLOCK_LENGTH]);
  76
  77 #define PUT_64BIT_LE(cp, value) do {                                    \
  78         (cp)[7] = (value) >> 56;                                        \
  79         (cp)[6] = (value) >> 48;                                        \
  80         (cp)[5] = (value) >> 40;                                        \
  81         (cp)[4] = (value) >> 32;                                        \
  82         (cp)[3] = (value) >> 24;                                        \
  83         (cp)[2] = (value) >> 16;                                        \
  84         (cp)[1] = (value) >> 8;                                         \
  85         (cp)[0] = (value); } while (0)
  86
  87 #define PUT_32BIT_LE(cp, value) do {                                    \
  88         (cp)[3] = (value) >> 24;                                        \
  89         (cp)[2] = (value) >> 16;                                        \
  90         (cp)[1] = (value) >> 8;                                         \
  91         (cp)[0] = (value); } while (0)
  92
  93 static u8 PADDING[MD4_BLOCK_LENGTH] = {
  94         0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  95         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  96         0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  97 };
  98
  99 /*
 100  * Start MD4 accumulation.
 101  * Set bit count to 0 and buffer to mysterious initialization constants.
 102  */
 103 static void MD4Init(MD4_CTX *ctx)
 104 {
 105         ctx->count = 0;
 106         ctx->state[0] = 0x67452301;
 107         ctx->state[1] = 0xefcdab89;
 108         ctx->state[2] = 0x98badcfe;
 109         ctx->state[3] = 0x10325476;
 110 }
 111
 112 /*
 113  * Update context to reflect the concatenation of another buffer full
 114  * of bytes.
 115  */
 116 static void MD4Update(MD4_CTX *ctx, const unsigned char *input, size_t len)
 117 {
 118         size_t have, need;
 119
 120         /* Check how many bytes we already have and how many more we need. */
 121         have = (size_t)((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
 122         need = MD4_BLOCK_LENGTH - have;
 123
 124         /* Update bitcount */
 125         ctx->count += (u64)len << 3;
 126
 127         if (len >= need) {
 128                 if (have != 0) {
 129                         os_memcpy(ctx->buffer + have, input, need);
 130                         MD4Transform(ctx->state, ctx->buffer);
 131                         input += need;
 132                         len -= need;
 133                         have = 0;
 134                 }
 135
 136                 /* Process data in MD4_BLOCK_LENGTH-byte chunks. */
 137                 while (len >= MD4_BLOCK_LENGTH) {
 138                         MD4Transform(ctx->state, input);
 139                         input += MD4_BLOCK_LENGTH;
 140                         len -= MD4_BLOCK_LENGTH;
 141                 }
 142         }
 143
 144         /* Handle any remaining bytes of data. */
 145         if (len != 0)
 146                 os_memcpy(ctx->buffer + have, input, len);
 147 }
 148
 149 /*
 150  * Pad pad to 64-byte boundary with the bit pattern
 151  * 1 0* (64-bit count of bits processed, MSB-first)
 152  */
 153 static void MD4Pad(MD4_CTX *ctx)
 154 {
 155         u8 count[8];
 156         size_t padlen;
 157
 158         /* Convert count to 8 bytes in little endian order. */
 159         PUT_64BIT_LE(count, ctx->count);
 160
 161         /* Pad out to 56 mod 64. */
 162         padlen = MD4_BLOCK_LENGTH -
 163             ((ctx->count >> 3) & (MD4_BLOCK_LENGTH - 1));
 164         if (padlen < 1 + 8)
 165                 padlen += MD4_BLOCK_LENGTH;
 166         MD4Update(ctx, PADDING, padlen - 8);            /* padlen - 8 <= 64 */
 167         MD4Update(ctx, count, 8);
 168 }
 169
 170 /*
 171  * Final wrapup--call MD4Pad, fill in digest and zero out ctx.
 172  */
 173 static void MD4Final(unsigned char digest[MD4_DIGEST_LENGTH], MD4_CTX *ctx)
 174 {
 175         int i;
 176
 177         MD4Pad(ctx);
 178         if (digest != NULL) {
 179                 for (i = 0; i < 4; i++)
 180                         PUT_32BIT_LE(digest + i * 4, ctx->state[i]);
 181                 os_memset(ctx, 0, sizeof(*ctx));
 182         }
 183 }
 184
 185
 186 /* The three core functions - F1 is optimized somewhat */
 187
 188 /* #define F1(x, y, z) (x & y | ~x & z) */
 189 #define F1(x, y, z) (z ^ (x & (y ^ z)))
 190 #define F2(x, y, z) ((x & y) | (x & z) | (y & z))
 191 #define F3(x, y, z) (x ^ y ^ z)
 192
 193 /* This is the central step in the MD4 algorithm. */
 194 #define MD4STEP(f, w, x, y, z, data, s) \
 195         ( w += f(x, y, z) + data,  w = w<<s | w>>(32-s) )
 196
 197 /*
 198  * The core of the MD4 algorithm, this alters an existing MD4 hash to
 199  * reflect the addition of 16 longwords of new data.  MD4Update blocks
 200  * the data and converts bytes into longwords for this routine.
 201  */
 202 static void
 203 MD4Transform(u32 state[4], const u8 block[MD4_BLOCK_LENGTH])
 204 {
 205         u32 a, b, c, d, in[MD4_BLOCK_LENGTH / 4];
 206
 207 #if BYTE_ORDER == LITTLE_ENDIAN
 208         os_memcpy(in, block, sizeof(in));
 209 #else
 210         for (a = 0; a < MD4_BLOCK_LENGTH / 4; a++) {
 211                 in[a] = (u32)(
 212                     (u32)(block[a * 4 + 0]) |
 213                     (u32)(block[a * 4 + 1]) <<  8 |
 214                     (u32)(block[a * 4 + 2]) << 16 |
 215                     (u32)(block[a * 4 + 3]) << 24);
 216         }
 217 #endif
 218
 219         a = state[0];
 220         b = state[1];
 221         c = state[2];
 222         d = state[3];
 223
 224         MD4STEP(F1, a, b, c, d, in[ 0],  3);
 225         MD4STEP(F1, d, a, b, c, in[ 1],  7);
 226         MD4STEP(F1, c, d, a, b, in[ 2], 11);
 227         MD4STEP(F1, b, c, d, a, in[ 3], 19);
 228         MD4STEP(F1, a, b, c, d, in[ 4],  3);
 229         MD4STEP(F1, d, a, b, c, in[ 5],  7);
 230         MD4STEP(F1, c, d, a, b, in[ 6], 11);
 231         MD4STEP(F1, b, c, d, a, in[ 7], 19);
 232         MD4STEP(F1, a, b, c, d, in[ 8],  3);
 233         MD4STEP(F1, d, a, b, c, in[ 9],  7);
 234         MD4STEP(F1, c, d, a, b, in[10], 11);
 235         MD4STEP(F1, b, c, d, a, in[11], 19);
 236         MD4STEP(F1, a, b, c, d, in[12],  3);
 237         MD4STEP(F1, d, a, b, c, in[13],  7);
 238         MD4STEP(F1, c, d, a, b, in[14], 11);
 239         MD4STEP(F1, b, c, d, a, in[15], 19);
 240
 241         MD4STEP(F2, a, b, c, d, in[ 0] + 0x5a827999,  3);
 242         MD4STEP(F2, d, a, b, c, in[ 4] + 0x5a827999,  5);
 243         MD4STEP(F2, c, d, a, b, in[ 8] + 0x5a827999,  9);
 244         MD4STEP(F2, b, c, d, a, in[12] + 0x5a827999, 13);
 245         MD4STEP(F2, a, b, c, d, in[ 1] + 0x5a827999,  3);
 246         MD4STEP(F2, d, a, b, c, in[ 5] + 0x5a827999,  5);
 247         MD4STEP(F2, c, d, a, b, in[ 9] + 0x5a827999,  9);
 248         MD4STEP(F2, b, c, d, a, in[13] + 0x5a827999, 13);
 249         MD4STEP(F2, a, b, c, d, in[ 2] + 0x5a827999,  3);
 250         MD4STEP(F2, d, a, b, c, in[ 6] + 0x5a827999,  5);
 251         MD4STEP(F2, c, d, a, b, in[10] + 0x5a827999,  9);
 252         MD4STEP(F2, b, c, d, a, in[14] + 0x5a827999, 13);
 253         MD4STEP(F2, a, b, c, d, in[ 3] + 0x5a827999,  3);
 254         MD4STEP(F2, d, a, b, c, in[ 7] + 0x5a827999,  5);
 255         MD4STEP(F2, c, d, a, b, in[11] + 0x5a827999,  9);
 256         MD4STEP(F2, b, c, d, a, in[15] + 0x5a827999, 13);
 257
 258         MD4STEP(F3, a, b, c, d, in[ 0] + 0x6ed9eba1,  3);
 259         MD4STEP(F3, d, a, b, c, in[ 8] + 0x6ed9eba1,  9);
 260         MD4STEP(F3, c, d, a, b, in[ 4] + 0x6ed9eba1, 11);
 261         MD4STEP(F3, b, c, d, a, in[12] + 0x6ed9eba1, 15);
 262         MD4STEP(F3, a, b, c, d, in[ 2] + 0x6ed9eba1,  3);
 263         MD4STEP(F3, d, a, b, c, in[10] + 0x6ed9eba1,  9);
 264         MD4STEP(F3, c, d, a, b, in[ 6] + 0x6ed9eba1, 11);
 265         MD4STEP(F3, b, c, d, a, in[14] + 0x6ed9eba1, 15);
 266         MD4STEP(F3, a, b, c, d, in[ 1] + 0x6ed9eba1,  3);
 267         MD4STEP(F3, d, a, b, c, in[ 9] + 0x6ed9eba1,  9);
 268         MD4STEP(F3, c, d, a, b, in[ 5] + 0x6ed9eba1, 11);
 269         MD4STEP(F3, b, c, d, a, in[13] + 0x6ed9eba1, 15);
 270         MD4STEP(F3, a, b, c, d, in[ 3] + 0x6ed9eba1,  3);
 271         MD4STEP(F3, d, a, b, c, in[11] + 0x6ed9eba1,  9);
 272         MD4STEP(F3, c, d, a, b, in[ 7] + 0x6ed9eba1, 11);
 273         MD4STEP(F3, b, c, d, a, in[15] + 0x6ed9eba1, 15);
 274
 275         state[0] += a;
 276         state[1] += b;
 277         state[2] += c;
 278         state[3] += d;
 279 }
 280 /* ===== end - public domain MD4 implementation ===== */
 281
 282 #endif /* INTERNAL_MD4 */