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/*
* Copyright (C) 2010-2016 Free Software Foundation, Inc.
* Copyright (C) 2015-2016 Red Hat, Inc.
*
* Author: Nia Alarie
*
* This file is part of GNUTLS.
*
* The GNUTLS library 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.
*
* This library 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 this program. If not, see <https://www.gnu.org/licenses/>
*
*/
/*
* The *BSD sysctl-based system random generator.
* Used on NetBSD.
*/
#include "gnutls_int.h"
#include "errors.h"
#include <locks.h>
#include <num.h>
#include <errno.h>
#include <rnd-common.h>
#include <sys/sysctl.h>
#define ARRAY_SIZE(A) (sizeof(A)/sizeof((A)[0]))
get_entropy_func _rnd_get_system_entropy = NULL;
static int _rnd_get_system_entropy_sysctl(void* _rnd, size_t size)
{
static int name[] = {CTL_KERN, KERN_ARND};
size_t count, req;
unsigned char* p;
p = _rnd;
while (size) {
req = size < 32 ? size : 32;
count = req;
if (sysctl(name, ARRAY_SIZE(name), p, &count, NULL, 0) == -1) {
return GNUTLS_E_RANDOM_DEVICE_ERROR;
}
if (count != req) {
return GNUTLS_E_RANDOM_DEVICE_ERROR; /* Can't happen. */
}
p += count;
size -= count;
}
return 0;
}
int _rnd_system_entropy_init(void)
{
_rnd_get_system_entropy = _rnd_get_system_entropy_sysctl;
return 0;
}
void _rnd_system_entropy_deinit(void)
{
return;
}
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