external/bsd/bind/dist/lib/isc/md5.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (C) 2004, 2005, 2007, 2009  Internet Systems Consortium, Inc. ("ISC")
   5  * Copyright (C) 2000, 2001  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /* Id: md5.c,v 1.16 2009/02/06 23:47:42 tbox Exp */
  21
  22 /*! \file
  23  * This code implements the MD5 message-digest algorithm.
  24  * The algorithm is due to Ron Rivest.  This code was
  25  * written by Colin Plumb in 1993, no copyright is claimed.
  26  * This code is in the public domain; do with it what you wish.
  27  *
  28  * Equivalent code is available from RSA Data Security, Inc.
  29  * This code has been tested against that, and is equivalent,
  30  * except that you don't need to include two pages of legalese
  31  * with every copy.
  32  *
  33  * To compute the message digest of a chunk of bytes, declare an
  34  * MD5Context structure, pass it to MD5Init, call MD5Update as
  35  * needed on buffers full of bytes, and then call MD5Final, which
  36  * will fill a supplied 16-byte array with the digest.
  37  */
  38
  39 #include "config.h"
  40
  41 #include <isc/assertions.h>
  42 #include <isc/md5.h>
  43 #include <isc/platform.h>
  44 #include <isc/string.h>
  45 #include <isc/types.h>
  46 #include <isc/util.h>
  47
  48 #ifdef ISC_PLATFORM_OPENSSLHASH
  49
  50 void
  51 isc_md5_init(isc_md5_t *ctx) {
  52         EVP_DigestInit(ctx, EVP_md5());
  53 }
  54
  55 void
  56 isc_md5_invalidate(isc_md5_t *ctx) {
  57         EVP_MD_CTX_cleanup(ctx);
  58 }
  59
  60 void
  61 isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len) {
  62         EVP_DigestUpdate(ctx, (const void *) buf, (size_t) len);
  63 }
  64
  65 void
  66 isc_md5_final(isc_md5_t *ctx, unsigned char *digest) {
  67         EVP_DigestFinal(ctx, digest, NULL);
  68 }
  69
  70 #else
  71
  72 static void
  73 byteSwap(isc_uint32_t *buf, unsigned words)
  74 {
  75         unsigned char *p = (unsigned char *)buf;
  76
  77         do {
  78                 *buf++ = (isc_uint32_t)((unsigned)p[3] << 8 | p[2]) << 16 |
  79                         ((unsigned)p[1] << 8 | p[0]);
  80                 p += 4;
  81         } while (--words);
  82 }
  83
  84 /*!
  85  * Start MD5 accumulation.  Set bit count to 0 and buffer to mysterious
  86  * initialization constants.
  87  */
  88 void
  89 isc_md5_init(isc_md5_t *ctx) {
  90         ctx->buf[0] = 0x67452301;
  91         ctx->buf[1] = 0xefcdab89;
  92         ctx->buf[2] = 0x98badcfe;
  93         ctx->buf[3] = 0x10325476;
  94
  95         ctx->bytes[0] = 0;
  96         ctx->bytes[1] = 0;
  97 }
  98
  99 void
 100 isc_md5_invalidate(isc_md5_t *ctx) {
 101         memset(ctx, 0, sizeof(isc_md5_t));
 102 }
 103
 104 /*@{*/
 105 /*! The four core functions - F1 is optimized somewhat */
 106
 107 /* #define F1(x, y, z) (x & y | ~x & z) */
 108 #define F1(x, y, z) (z ^ (x & (y ^ z)))
 109 #define F2(x, y, z) F1(z, x, y)
 110 #define F3(x, y, z) (x ^ y ^ z)
 111 #define F4(x, y, z) (y ^ (x | ~z))
 112 /*@}*/
 113
 114 /*! This is the central step in the MD5 algorithm. */
 115 #define MD5STEP(f,w,x,y,z,in,s) \
 116          (w += f(x,y,z) + in, w = (w<<s | w>>(32-s)) + x)
 117
 118 /*!
 119  * The core of the MD5 algorithm, this alters an existing MD5 hash to
 120  * reflect the addition of 16 longwords of new data.  MD5Update blocks
 121  * the data and converts bytes into longwords for this routine.
 122  */
 123 static void
 124 transform(isc_uint32_t buf[4], isc_uint32_t const in[16]) {
 125         register isc_uint32_t a, b, c, d;
 126
 127         a = buf[0];
 128         b = buf[1];
 129         c = buf[2];
 130         d = buf[3];
 131
 132         MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
 133         MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
 134         MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
 135         MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
 136         MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
 137         MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
 138         MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
 139         MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
 140         MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
 141         MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
 142         MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
 143         MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
 144         MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
 145         MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
 146         MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
 147         MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
 148
 149         MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
 150         MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
 151         MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
 152         MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
 153         MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
 154         MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
 155         MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
 156         MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
 157         MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
 158         MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
 159         MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
 160         MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
 161         MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
 162         MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
 163         MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
 164         MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
 165
 166         MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
 167         MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
 168         MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
 169         MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
 170         MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
 171         MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
 172         MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
 173         MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
 174         MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
 175         MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
 176         MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
 177         MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
 178         MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
 179         MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
 180         MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
 181         MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
 182
 183         MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
 184         MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
 185         MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
 186         MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
 187         MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
 188         MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
 189         MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
 190         MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
 191         MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
 192         MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
 193         MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
 194         MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
 195         MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
 196         MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
 197         MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
 198         MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
 199
 200         buf[0] += a;
 201         buf[1] += b;
 202         buf[2] += c;
 203         buf[3] += d;
 204 }
 205
 206 /*!
 207  * Update context to reflect the concatenation of another buffer full
 208  * of bytes.
 209  */
 210 void
 211 isc_md5_update(isc_md5_t *ctx, const unsigned char *buf, unsigned int len) {
 212         isc_uint32_t t;
 213
 214         /* Update byte count */
 215
 216         t = ctx->bytes[0];
 217         if ((ctx->bytes[0] = t + len) < t)
 218                 ctx->bytes[1]++;        /* Carry from low to high */
 219
 220         t = 64 - (t & 0x3f);    /* Space available in ctx->in (at least 1) */
 221         if (t > len) {
 222                 memcpy((unsigned char *)ctx->in + 64 - t, buf, len);
 223                 return;
 224         }
 225         /* First chunk is an odd size */
 226         memcpy((unsigned char *)ctx->in + 64 - t, buf, t);
 227         byteSwap(ctx->in, 16);
 228         transform(ctx->buf, ctx->in);
 229         buf += t;
 230         len -= t;
 231
 232         /* Process data in 64-byte chunks */
 233         while (len >= 64) {
 234                 memcpy(ctx->in, buf, 64);
 235                 byteSwap(ctx->in, 16);
 236                 transform(ctx->buf, ctx->in);
 237                 buf += 64;
 238                 len -= 64;
 239         }
 240
 241         /* Handle any remaining bytes of data. */
 242         memcpy(ctx->in, buf, len);
 243 }
 244
 245 /*!
 246  * Final wrapup - pad to 64-byte boundary with the bit pattern
 247  * 1 0* (64-bit count of bits processed, MSB-first)
 248  */
 249 void
 250 isc_md5_final(isc_md5_t *ctx, unsigned char *digest) {
 251         int count = ctx->bytes[0] & 0x3f;    /* Number of bytes in ctx->in */
 252         unsigned char *p = (unsigned char *)ctx->in + count;
 253
 254         /* Set the first char of padding to 0x80.  There is always room. */
 255         *p++ = 0x80;
 256
 257         /* Bytes of padding needed to make 56 bytes (-8..55) */
 258         count = 56 - 1 - count;
 259
 260         if (count < 0) {        /* Padding forces an extra block */
 261                 memset(p, 0, count + 8);
 262                 byteSwap(ctx->in, 16);
 263                 transform(ctx->buf, ctx->in);
 264                 p = (unsigned char *)ctx->in;
 265                 count = 56;
 266         }
 267         memset(p, 0, count);
 268         byteSwap(ctx->in, 14);
 269
 270         /* Append length in bits and transform */
 271         ctx->in[14] = ctx->bytes[0] << 3;
 272         ctx->in[15] = ctx->bytes[1] << 3 | ctx->bytes[0] >> 29;
 273         transform(ctx->buf, ctx->in);
 274
 275         byteSwap(ctx->buf, 4);
 276         memcpy(digest, ctx->buf, 16);
 277         memset(ctx, 0, sizeof(isc_md5_t));      /* In case it's sensitive */
 278 }
 279 #endif