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/*
* Copyright (C) 2008-2012 Free Software Foundation, Inc.
*
* Author: Nikos Mavrogiannopoulos
*
* This file is part of GnuTLS.
*
* The GnuTLS 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 <http://www.gnu.org/licenses/>
*
*/
/* This file handles all the internal functions that cope with random data.
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <random.h>
#include <fips.h>
void *gnutls_rnd_ctx;
int _gnutls_rnd_init(void)
{
#ifdef ENABLE_FIPS140
/* The FIPS140 random generator is only enabled when we are compiled
* with FIPS support, _and_ the system requires FIPS140.
*/
if (_gnutls_fips_mode_enabled() == 1) {
int ret;
ret = gnutls_crypto_rnd_register(100, &_gnutls_fips_rnd_ops);
if (ret < 0)
return ret;
}
#endif
if (_gnutls_rnd_ops.init != NULL) {
if (_gnutls_rnd_ops.init(&gnutls_rnd_ctx) < 0) {
gnutls_assert();
return GNUTLS_E_RANDOM_FAILED;
}
}
return 0;
}
void _gnutls_rnd_deinit(void)
{
if (_gnutls_rnd_ops.deinit != NULL) {
_gnutls_rnd_ops.deinit(gnutls_rnd_ctx);
}
return;
}
/**
* gnutls_rnd:
* @level: a security level
* @data: place to store random bytes
* @len: The requested size
*
* This function will generate random data and store it to output
* buffer.
*
* This function is thread-safe and also fork-safe.
*
* Returns: Zero on success, or a negative error code on error.
*
* Since: 2.12.0
**/
int gnutls_rnd(gnutls_rnd_level_t level, void *data, size_t len)
{
FAIL_IF_LIB_ERROR;
return _gnutls_rnd(level, data, len);
}
/**
* gnutls_rnd_refresh:
*
* This function refreshes the random generator state.
* That is the current precise time, CPU usage, and
* other values are input into its state.
*
* On a slower rate input from /dev/urandom is mixed too.
*
* Since: 3.1.7
**/
void gnutls_rnd_refresh(void)
{
_gnutls_rnd_refresh();
}
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