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/*
* libcryptsetup - cryptsetup library, cipher benchmark
*
* Copyright (C) 2012-2021 Red Hat, Inc. All rights reserved.
* Copyright (C) 2012-2021 Milan Broz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdlib.h>
#include <errno.h>
#include "internal.h"
int crypt_benchmark(struct crypt_device *cd,
const char *cipher,
const char *cipher_mode,
size_t volume_key_size,
size_t iv_size,
size_t buffer_size,
double *encryption_mbs,
double *decryption_mbs)
{
void *buffer = NULL;
char *iv = NULL, *key = NULL, mode[MAX_CIPHER_LEN], *c;
int r;
if (!cipher || !cipher_mode || !volume_key_size || !encryption_mbs || !decryption_mbs)
return -EINVAL;
r = init_crypto(cd);
if (r < 0)
return r;
r = -ENOMEM;
if (posix_memalign(&buffer, crypt_getpagesize(), buffer_size))
goto out;
r = crypt_cipher_ivsize(cipher, cipher_mode);
if (r >= 0 && iv_size != (size_t)r) {
log_dbg(cd, "IV length for benchmark adjusted to %i bytes (requested %zu).", r, iv_size);
iv_size = r;
}
if (iv_size) {
iv = malloc(iv_size);
if (!iv)
goto out;
crypt_random_get(cd, iv, iv_size, CRYPT_RND_NORMAL);
}
key = malloc(volume_key_size);
if (!key)
goto out;
crypt_random_get(cd, key, volume_key_size, CRYPT_RND_NORMAL);
strncpy(mode, cipher_mode, sizeof(mode)-1);
/* Ignore IV generator */
if ((c = strchr(mode, '-')))
*c = '\0';
r = crypt_cipher_perf_kernel(cipher, cipher_mode, buffer, buffer_size, key, volume_key_size,
iv, iv_size, encryption_mbs, decryption_mbs);
if (r == -ERANGE)
log_dbg(cd, "Measured cipher runtime is too low.");
else if (r)
log_dbg(cd, "Cannot initialize cipher %s, mode %s, key size %zu, IV size %zu.",
cipher, cipher_mode, volume_key_size, iv_size);
out:
free(buffer);
free(key);
free(iv);
return r;
}
int crypt_benchmark_pbkdf(struct crypt_device *cd,
struct crypt_pbkdf_type *pbkdf,
const char *password,
size_t password_size,
const char *salt,
size_t salt_size,
size_t volume_key_size,
int (*progress)(uint32_t time_ms, void *usrptr),
void *usrptr)
{
int r;
const char *kdf_opt;
if (!pbkdf || (!password && password_size))
return -EINVAL;
r = init_crypto(cd);
if (r < 0)
return r;
kdf_opt = !strcmp(pbkdf->type, CRYPT_KDF_PBKDF2) ? pbkdf->hash : "";
log_dbg(cd, "Running %s(%s) benchmark.", pbkdf->type, kdf_opt);
r = crypt_pbkdf_perf(pbkdf->type, pbkdf->hash, password, password_size,
salt, salt_size, volume_key_size, pbkdf->time_ms,
pbkdf->max_memory_kb, pbkdf->parallel_threads,
&pbkdf->iterations, &pbkdf->max_memory_kb, progress, usrptr);
if (!r)
log_dbg(cd, "Benchmark returns %s(%s) %u iterations, %u memory, %u threads (for %zu-bits key).",
pbkdf->type, kdf_opt, pbkdf->iterations, pbkdf->max_memory_kb,
pbkdf->parallel_threads, volume_key_size * 8);
return r;
}
struct benchmark_usrptr {
struct crypt_device *cd;
struct crypt_pbkdf_type *pbkdf;
};
static int benchmark_callback(uint32_t time_ms, void *usrptr)
{
struct benchmark_usrptr *u = usrptr;
log_dbg(u->cd, "PBKDF benchmark: memory cost = %u, iterations = %u, "
"threads = %u (took %u ms)", u->pbkdf->max_memory_kb,
u->pbkdf->iterations, u->pbkdf->parallel_threads, time_ms);
return 0;
}
/*
* Used in internal places to benchmark crypt_device context PBKDF.
* Once requested parameters are benchmarked, iterations attribute is set,
* and the benchmarked values can be reused.
* Note that memory cost can be changed after benchmark (if used).
* NOTE: You need to check that you are benchmarking for the same key size.
*/
int crypt_benchmark_pbkdf_internal(struct crypt_device *cd,
struct crypt_pbkdf_type *pbkdf,
size_t volume_key_size)
{
struct crypt_pbkdf_limits pbkdf_limits;
double PBKDF2_tmp;
uint32_t ms_tmp;
int r = -EINVAL;
struct benchmark_usrptr u = {
.cd = cd,
.pbkdf = pbkdf
};
r = crypt_pbkdf_get_limits(pbkdf->type, &pbkdf_limits);
if (r)
return r;
if (pbkdf->flags & CRYPT_PBKDF_NO_BENCHMARK) {
if (pbkdf->iterations) {
log_dbg(cd, "Reusing PBKDF values (no benchmark flag is set).");
return 0;
}
log_err(cd, _("PBKDF benchmark disabled but iterations not set."));
return -EINVAL;
}
/* For PBKDF2 run benchmark always. Also note it depends on volume_key_size! */
if (!strcmp(pbkdf->type, CRYPT_KDF_PBKDF2)) {
/*
* For PBKDF2 it is enough to run benchmark for only 1 second
* and interpolate final iterations value from it.
*/
ms_tmp = pbkdf->time_ms;
pbkdf->time_ms = 1000;
pbkdf->parallel_threads = 0; /* N/A in PBKDF2 */
pbkdf->max_memory_kb = 0; /* N/A in PBKDF2 */
r = crypt_benchmark_pbkdf(cd, pbkdf, "foo", 3, "bar", 3,
volume_key_size, &benchmark_callback, &u);
pbkdf->time_ms = ms_tmp;
if (r < 0) {
log_err(cd, _("Not compatible PBKDF2 options (using hash algorithm %s)."),
pbkdf->hash);
return r;
}
PBKDF2_tmp = ((double)pbkdf->iterations * pbkdf->time_ms / 1000.);
if (PBKDF2_tmp > (double)UINT32_MAX)
return -EINVAL;
pbkdf->iterations = at_least((uint32_t)PBKDF2_tmp, pbkdf_limits.min_iterations);
} else {
/* Already benchmarked */
if (pbkdf->iterations) {
log_dbg(cd, "Reusing PBKDF values.");
return 0;
}
r = crypt_benchmark_pbkdf(cd, pbkdf, "foo", 3,
"0123456789abcdef0123456789abcdef", 32,
volume_key_size, &benchmark_callback, &u);
if (r < 0)
log_err(cd, _("Not compatible PBKDF options."));
}
return r;
}
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