pkcs5v2.c

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    1 /*-
    2  * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.2/sys/geom/eli/pkcs5v2.c 329175 2018-02-12 17:44:35Z kevans $");
   29 
   30 #include <sys/param.h>
   31 #ifdef _KERNEL
   32 #include <sys/systm.h>
   33 #include <sys/kernel.h>
   34 #else
   35 #include <sys/resource.h>
   36 #include <stdint.h>
   37 #include <strings.h>
   38 #endif
   39 
   40 #include <geom/eli/g_eli.h>
   41 #include <geom/eli/pkcs5v2.h>
   42 
   43 static __inline void
   44 xor(uint8_t *dst, const uint8_t *src, size_t size)
   45 {
   46 
   47         for (; size > 0; size--)
   48                 *dst++ ^= *src++;
   49 }
   50 
   51 void
   52 pkcs5v2_genkey(uint8_t *key, unsigned keylen, const uint8_t *salt,
   53     size_t saltsize, const char *passphrase, u_int iterations)
   54 {
   55         uint8_t md[SHA512_MDLEN], saltcount[saltsize + sizeof(uint32_t)];
   56         uint8_t *counter, *keyp;
   57         u_int i, bsize, passlen;
   58         uint32_t count;
   59         struct hmac_ctx startpoint, ctx;
   60 
   61         passlen = strlen(passphrase);
   62         bzero(key, keylen);
   63         bcopy(salt, saltcount, saltsize);
   64         counter = saltcount + saltsize;
   65 
   66         keyp = key;
   67         for (count = 1; keylen > 0; count++, keylen -= bsize, keyp += bsize) {
   68                 bsize = MIN(keylen, sizeof(md));
   69 
   70                 be32enc(counter, count);
   71 
   72                 g_eli_crypto_hmac_init(&startpoint, passphrase, passlen);
   73                 ctx = startpoint;
   74                 g_eli_crypto_hmac_update(&ctx, saltcount, sizeof(saltcount));
   75                 g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
   76                 xor(keyp, md, bsize);
   77 
   78                 for(i = 1; i < iterations; i++) {
   79                         ctx = startpoint;
   80                         g_eli_crypto_hmac_update(&ctx, md, sizeof(md));
   81                         g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
   82                         xor(keyp, md, bsize);
   83                 }
   84         }
   85         explicit_bzero(&startpoint, sizeof(startpoint));
   86         explicit_bzero(&ctx, sizeof(ctx));
   87 }
   88 
   89 #ifndef _KERNEL
   90 #ifndef _STANDALONE
   91 /*
   92  * Return the number of microseconds needed for 'interations' iterations.
   93  */
   94 static int
   95 pkcs5v2_probe(int iterations)
   96 {
   97         uint8_t key[G_ELI_USERKEYLEN], salt[G_ELI_SALTLEN];
   98         uint8_t passphrase[] = "passphrase";
   99         struct rusage start, end;
  100         int usecs;
  101 
  102         getrusage(RUSAGE_SELF, &start);
  103         pkcs5v2_genkey(key, sizeof(key), salt, sizeof(salt), passphrase,
  104             iterations);
  105         getrusage(RUSAGE_SELF, &end);
  106 
  107         usecs = end.ru_utime.tv_sec - start.ru_utime.tv_sec;
  108         usecs *= 1000000;
  109         usecs += end.ru_utime.tv_usec - start.ru_utime.tv_usec;
  110         return (usecs);
  111 }
  112 
  113 /*
  114  * Return the number of iterations which takes 'usecs' microseconds.
  115  */
  116 int
  117 pkcs5v2_calculate(int usecs)
  118 {
  119         int iterations, v;
  120 
  121         for (iterations = 1; ; iterations <<= 1) {
  122                 v = pkcs5v2_probe(iterations);
  123                 if (v > 2000000)
  124                         break;
  125         }
  126         return (((intmax_t)iterations * (intmax_t)usecs) / v);
  127 }
  128 #endif  /* !_STANDALONE */
  129 #endif  /* !_KERNEL */

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FreeBSD/Linux Kernel Cross Reference sys/geom/eli/pkcs5v2.c

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sys/geom/eli/pkcs5v2.c