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/***
This file is part of PulseAudio.
Copyright 2004-2006 Lennart Poettering
Copyright 2006 Pierre Ossman <ossman@cendio.se> for Cendio AB
PulseAudio is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
PulseAudio 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <time.h>
#ifdef HAVE_WINDOWS_H
#include <windows.h>
#include <wincrypt.h>
#endif
#include <pulsecore/core-util.h>
#include <pulsecore/log.h>
#include <pulsecore/macro.h>
#include "random.h"
static bool has_whined = false;
static const char * const devices[] = { "/dev/urandom", "/dev/random", NULL };
static int random_proper(void *ret_data, size_t length) {
#ifdef OS_IS_WIN32
int ret = -1;
HCRYPTPROV hCryptProv = 0;
pa_assert(ret_data);
pa_assert(length > 0);
if (CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
if (CryptGenRandom(hCryptProv, length, ret_data))
ret = 0;
CryptReleaseContext(hCryptProv, 0);
}
return ret;
#else /* OS_IS_WIN32 */
int fd, ret = -1;
ssize_t r = 0;
const char *const * device;
pa_assert(ret_data);
pa_assert(length > 0);
device = devices;
while (*device) {
ret = 0;
if ((fd = pa_open_cloexec(*device, O_RDONLY, 0)) >= 0) {
if ((r = pa_loop_read(fd, ret_data, length, NULL)) < 0 || (size_t) r != length)
ret = -1;
pa_close(fd);
} else
ret = -1;
if (ret == 0)
break;
device++;
}
return ret;
#endif /* OS_IS_WIN32 */
}
void pa_random_seed(void) {
unsigned int seed;
if (random_proper(&seed, sizeof(unsigned int)) < 0) {
if (!has_whined) {
pa_log_warn("Failed to get proper entropy. Falling back to seeding with current time.");
has_whined = true;
}
seed = (unsigned int) time(NULL);
}
srand(seed);
}
void pa_random(void *ret_data, size_t length) {
uint8_t *p;
size_t l;
pa_assert(ret_data);
pa_assert(length > 0);
if (random_proper(ret_data, length) >= 0)
return;
if (!has_whined) {
pa_log_warn("Failed to get proper entropy. Falling back to unsecure pseudo RNG.");
has_whined = true;
}
for (p = ret_data, l = length; l > 0; p++, l--)
*p = (uint8_t) rand();
}
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