2 * PBKDF performance check
3 * Copyright (C) 2012, Red Hat, Inc. All rights reserved.
4 * Copyright (C) 2012-2014, Milan Broz
6 * This file is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
11 * This file is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this file; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
23 #include <sys/resource.h>
24 #include "crypto_backend.h"
26 static long time_ms(struct rusage *start, struct rusage *end)
28 int count_kernel_time = 0;
31 if (crypt_backend_flags() & CRYPT_BACKEND_KERNEL)
32 count_kernel_time = 1;
35 * FIXME: if there is no self usage info, count system time.
36 * This seem like getrusage() bug in some hypervisors...
38 if (!end->ru_utime.tv_sec && !start->ru_utime.tv_sec &&
39 !end->ru_utime.tv_usec && !start->ru_utime.tv_usec)
40 count_kernel_time = 1;
42 ms = (end->ru_utime.tv_sec - start->ru_utime.tv_sec) * 1000;
43 ms += (end->ru_utime.tv_usec - start->ru_utime.tv_usec) / 1000;
45 if (count_kernel_time) {
46 ms += (end->ru_stime.tv_sec - start->ru_stime.tv_sec) * 1000;
47 ms += (end->ru_stime.tv_usec - start->ru_stime.tv_usec) / 1000;
53 /* This code benchmarks PBKDF and returns iterations/second using specified hash */
54 int crypt_pbkdf_check(const char *kdf, const char *hash,
55 const char *password, size_t password_size,
56 const char *salt, size_t salt_size,
59 struct rusage rstart, rend;
63 unsigned int iterations;
70 if (getrusage(RUSAGE_SELF, &rstart) < 0)
73 r = crypt_pbkdf(kdf, hash, password, password_size, salt,
74 salt_size, &buf, 1, iterations);
78 if (getrusage(RUSAGE_SELF, &rend) < 0)
81 ms = time_ms(&rstart, &rend);
94 if (++step > 10 || !iterations)
99 *iter_secs = (iterations * 1000) / ms;