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/8.3/sys/geom/eli/pkcs5v2.c 155174 2006-02-01 12:06:01Z pjd $");
   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 
   60         passlen = strlen(passphrase);
   61         bzero(key, keylen);
   62         bcopy(salt, saltcount, saltsize);
   63         counter = saltcount + saltsize;
   64 
   65         keyp = key;
   66         for (count = 1; keylen > 0; count++, keylen -= bsize, keyp += bsize) {
   67                 bsize = MIN(keylen, sizeof(md));
   68 
   69                 counter[0] = (count >> 24) & 0xff;
   70                 counter[1] = (count >> 16) & 0xff;
   71                 counter[2] = (count >> 8) & 0xff;
   72                 counter[3] = count & 0xff;
   73                 g_eli_crypto_hmac(passphrase, passlen, saltcount,
   74                     sizeof(saltcount), md, 0);
   75                 xor(keyp, md, bsize);
   76 
   77                 for(i = 1; i < iterations; i++) {
   78                         g_eli_crypto_hmac(passphrase, passlen, md, sizeof(md),
   79                             md, 0);
   80                         xor(keyp, md, bsize);
   81                 }
   82         }
   83 }
   84 
   85 #ifndef _KERNEL
   86 /*
   87  * Return the number of microseconds needed for 'interations' iterations.
   88  */
   89 static int
   90 pkcs5v2_probe(int iterations)
   91 {
   92         uint8_t key[G_ELI_USERKEYLEN], salt[G_ELI_SALTLEN];
   93         uint8_t passphrase[] = "passphrase";
   94         struct rusage start, end;
   95         int usecs;
   96 
   97         getrusage(RUSAGE_SELF, &start);
   98         pkcs5v2_genkey(key, sizeof(key), salt, sizeof(salt), passphrase,
   99             iterations);
  100         getrusage(RUSAGE_SELF, &end);
  101 
  102         usecs = end.ru_utime.tv_sec - start.ru_utime.tv_sec;
  103         usecs *= 1000000;
  104         usecs += end.ru_utime.tv_usec - start.ru_utime.tv_usec;
  105         return (usecs);
  106 }
  107 
  108 /*
  109  * Return the number of iterations which takes 'usecs' microseconds.
  110  */
  111 int
  112 pkcs5v2_calculate(int usecs)
  113 {
  114         int iterations, v;
  115 
  116         for (iterations = 1; ; iterations <<= 1) {
  117                 v = pkcs5v2_probe(iterations);
  118                 if (v > 2000000)
  119                         break;
  120         }
  121         return (((intmax_t)iterations * (intmax_t)usecs) / v);
  122 }
  123 #endif  /* !_KERNEL */

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

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