2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2005 Pawel Jakub Dawidek <pjd@FreeBSD.org>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
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.
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
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
32 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/kernel.h>
37 #include <sys/resource.h>
42 #include <geom/eli/g_eli.h>
43 #include <geom/eli/pkcs5v2.h>
46 xor(uint8_t *dst, const uint8_t *src, size_t size)
49 for (; size > 0; size--)
54 pkcs5v2_genkey(uint8_t *key, unsigned keylen, const uint8_t *salt,
55 size_t saltsize, const char *passphrase, u_int iterations)
57 uint8_t md[SHA512_MDLEN], saltcount[saltsize + sizeof(uint32_t)];
58 uint8_t *counter, *keyp;
59 u_int i, bsize, passlen;
61 struct hmac_ctx startpoint, ctx;
63 passlen = strlen(passphrase);
65 bcopy(salt, saltcount, saltsize);
66 counter = saltcount + saltsize;
69 for (count = 1; keylen > 0; count++, keylen -= bsize, keyp += bsize) {
70 bsize = MIN(keylen, sizeof(md));
72 be32enc(counter, count);
74 g_eli_crypto_hmac_init(&startpoint, passphrase, passlen);
76 g_eli_crypto_hmac_update(&ctx, saltcount, sizeof(saltcount));
77 g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
80 for(i = 1; i < iterations; i++) {
82 g_eli_crypto_hmac_update(&ctx, md, sizeof(md));
83 g_eli_crypto_hmac_final(&ctx, md, sizeof(md));
87 explicit_bzero(&startpoint, sizeof(startpoint));
88 explicit_bzero(&ctx, sizeof(ctx));
94 * Return the number of microseconds needed for 'interations' iterations.
97 pkcs5v2_probe(int iterations)
99 uint8_t key[G_ELI_USERKEYLEN], salt[G_ELI_SALTLEN];
100 const char passphrase[] = "passphrase";
101 struct rusage start, end;
104 getrusage(RUSAGE_SELF, &start);
105 pkcs5v2_genkey(key, sizeof(key), salt, sizeof(salt), passphrase,
107 getrusage(RUSAGE_SELF, &end);
109 usecs = end.ru_utime.tv_sec - start.ru_utime.tv_sec;
111 usecs += end.ru_utime.tv_usec - start.ru_utime.tv_usec;
116 * Return the number of iterations which takes 'usecs' microseconds.
119 pkcs5v2_calculate(int usecs)
123 for (iterations = 1; ; iterations <<= 1) {
124 v = pkcs5v2_probe(iterations);
128 return (((intmax_t)iterations * (intmax_t)usecs) / v);
130 #endif /* !_STANDALONE */
131 #endif /* !_KERNEL */