mirror of
https://gitlab.com/cryptsetup/cryptsetup.git
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89 lines
2.3 KiB
C
89 lines
2.3 KiB
C
/*
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* PBKDF performance check
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* Copyright (C) 2012, Red Hat, Inc. All rights reserved.
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*
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* This file is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This file is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this file; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include <errno.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include "crypto_backend.h"
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static long time_ms(struct rusage *start, struct rusage *end)
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{
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long ms;
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ms = (end->ru_utime.tv_sec - start->ru_utime.tv_sec) * 1000;
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ms += (end->ru_utime.tv_usec - start->ru_utime.tv_usec) / 1000;
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if (crypt_backend_flags() & CRYPT_BACKEND_KERNEL) {
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ms += (end->ru_stime.tv_sec - start->ru_stime.tv_sec) * 1000;
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ms += (end->ru_stime.tv_usec - start->ru_stime.tv_usec) / 1000;
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}
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return ms;
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}
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/* This code benchmarks PBKDF and returns iterations/second using specified hash */
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int crypt_pbkdf_check(const char *kdf, const char *hash, uint64_t *iter_secs)
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{
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struct rusage rstart, rend;
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int r = 0, step = 0;
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long ms = 0;
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char buf;
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unsigned int iterations;
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if (!kdf || !hash)
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return -EINVAL;
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iterations = 1 << 15;
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while (ms < 500) {
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if (getrusage(RUSAGE_SELF, &rstart) < 0)
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return -EINVAL;
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r = crypt_pbkdf(kdf, hash, "foo", 3, "bar", 3, &buf, 1, iterations);
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if (r < 0)
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return r;
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if (getrusage(RUSAGE_SELF, &rend) < 0)
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return -EINVAL;
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ms = time_ms(&rstart, &rend);
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if (ms > 500)
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break;
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if (ms <= 62)
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iterations <<= 4;
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else if (ms <= 125)
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iterations <<= 3;
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else if (ms <= 250)
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iterations <<= 2;
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else
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iterations <<= 1;
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if (++step > 10 || !iterations)
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return -EINVAL;
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}
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/* Safety check if anything went wrong */
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if (ms < 10)
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return -EINVAL;
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if (iter_secs)
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*iter_secs = (iterations * 1000) / ms;
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return r;
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}
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