The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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

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