1
/* $Id: random.c 1272 2006-08-18 21:38:40Z lennart $ */
4
This file is part of PulseAudio.
6
PulseAudio is free software; you can redistribute it and/or modify
7
it under the terms of the GNU Lesser General Public License as
8
published by the Free Software Foundation; either version 2.1 of the
9
License, or (at your option) any later version.
11
PulseAudio is distributed in the hope that it will be useful, but
12
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 PulseAudio; if not, write to the Free Software
18
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
34
#include <pulsecore/core-util.h>
35
#include <pulsecore/log.h>
39
static int has_whined = 0;
41
static const char *devices[] = { "/dev/urandom", "/dev/random", NULL };
43
static int random_proper(void *ret_data, size_t length) {
45
assert(ret_data && length);
49
#else /* OS_IS_WIN32 */
55
assert(ret_data && length);
62
if ((fd = open(*device, O_RDONLY)) >= 0) {
64
if ((r = pa_loop_read(fd, ret_data, length, NULL)) < 0 || (size_t) r != length)
76
#endif /* OS_IS_WIN32 */
79
void pa_random_seed(void) {
82
if (random_proper(&seed, sizeof(unsigned int)) < 0) {
84
pa_log_warn("failed to get proper entropy. Falling back to seeding with current time.");
87
seed = (unsigned int) time(NULL);
93
void pa_random(void *ret_data, size_t length) {
97
assert(ret_data && length);
99
if (random_proper(ret_data, length) >= 0)
103
pa_log_warn("failed to get proper entropy. Falling back to unsecure pseudo RNG.");
106
for (p = ret_data, l = length; l > 0; p++, l--)
107
*p = (uint8_t) rand();