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// SPDX-License-Identifier: LGPL-2.1-or-later
/*
* Cipher performance check
*
* Copyright (C) 2018-2025 Red Hat, Inc. All rights reserved.
* Copyright (C) 2018-2025 Milan Broz
*/
#include <errno.h>
#include <time.h>
#include "crypto_backend_internal.h"
#ifndef CLOCK_MONOTONIC_RAW
#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
#endif
/*
* This is not simulating storage, so using disk block causes extreme overhead.
* Let's use some fixed block size where results are more reliable...
*/
#define CIPHER_BLOCK_BYTES 65536
/*
* If the measured value is lower, encrypted buffer is probably too small
* and calculated values are not reliable.
*/
#define CIPHER_TIME_MIN_MS 0.001
/*
* The whole test depends on Linux kernel usermode crypto API for now.
* (The same implementations are used in dm-crypt though.)
*/
static int time_ms(struct timespec *start, struct timespec *end, double *ms)
{
double start_ms, end_ms;
start_ms = start->tv_sec * 1000.0 + start->tv_nsec / (1000.0 * 1000);
end_ms = end->tv_sec * 1000.0 + end->tv_nsec / (1000.0 * 1000);
*ms = end_ms - start_ms;
return 0;
}
static int cipher_perf_one(struct crypt_cipher_kernel *cipher, char *buffer, size_t buffer_size,
const char *iv, size_t iv_size, int enc)
{
size_t done = 0, block = CIPHER_BLOCK_BYTES;
int r;
if (buffer_size < block)
block = buffer_size;
while (done < buffer_size) {
if ((done + block) > buffer_size)
block = buffer_size - done;
if (enc)
r = crypt_cipher_encrypt_kernel(cipher, &buffer[done], &buffer[done],
block, iv, iv_size);
else
r = crypt_cipher_decrypt_kernel(cipher, &buffer[done], &buffer[done],
block, iv, iv_size);
if (r < 0)
return r;
done += block;
}
return 0;
}
static int cipher_measure(struct crypt_cipher_kernel *cipher, char *buffer, size_t buffer_size,
const char *iv, size_t iv_size, int encrypt, double *ms)
{
struct timespec start, end;
int r;
/*
* Using getrusage would be better here but the precision
* is not adequate, so better stick with CLOCK_MONOTONIC
*/
if (clock_gettime(CLOCK_MONOTONIC_RAW, &start) < 0)
return -EINVAL;
r = cipher_perf_one(cipher, buffer, buffer_size, iv, iv_size, encrypt);
if (r < 0)
return r;
if (clock_gettime(CLOCK_MONOTONIC_RAW, &end) < 0)
return -EINVAL;
r = time_ms(&start, &end, ms);
if (r < 0)
return r;
if (*ms < CIPHER_TIME_MIN_MS)
return -ERANGE;
return 0;
}
static double speed_mbs(unsigned long bytes, double ms)
{
double speed = bytes, s = ms / 1000.;
return speed / (1024 * 1024) / s;
}
int crypt_cipher_perf_kernel(const char *name, const char *mode, char *buffer, size_t buffer_size,
const char *key, size_t key_size, const char *iv, size_t iv_size,
double *encryption_mbs, double *decryption_mbs)
{
struct crypt_cipher_kernel cipher;
double ms_enc, ms_dec, ms;
int r, repeat_enc, repeat_dec;
r = crypt_cipher_init_kernel(&cipher, name, mode, key, key_size);
if (r < 0)
return r;
ms_enc = 0.0;
repeat_enc = 1;
while (ms_enc < 1000.0) {
r = cipher_measure(&cipher, buffer, buffer_size, iv, iv_size, 1, &ms);
if (r < 0)
goto out;
ms_enc += ms;
repeat_enc++;
}
ms_dec = 0.0;
repeat_dec = 1;
while (ms_dec < 1000.0) {
r = cipher_measure(&cipher, buffer, buffer_size, iv, iv_size, 0, &ms);
if (r < 0)
goto out;
ms_dec += ms;
repeat_dec++;
}
*encryption_mbs = speed_mbs(buffer_size * repeat_enc, ms_enc);
*decryption_mbs = speed_mbs(buffer_size * repeat_dec, ms_dec);
r = 0;
out:
crypt_cipher_destroy_kernel(&cipher);
return r;
}
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