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/*
* Copyright (C) 2008 Free Software Foundation
*
* Author: Nikos Mavrogiannopoulos
*
* 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 library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA
*
*/
/* This file handles all the internal functions that cope with random data.
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <random.h>
static gnutls_crypto_rnd_st * cc = NULL;
static void * rnd_ctx;
int
_gnutls_rnd_init ()
{
int result;
/* check if a digest has been registered
*/
cc = _gnutls_get_crypto_rnd();
if (cc != NULL) {
if (cc->init(& rnd_ctx) < 0) {
gnutls_assert();
return GNUTLS_E_RANDOM_FAILED;
}
} else {
char c;
gc_pseudo_random (&c, 1);
}
return 0;
}
void
_gnutls_rnd_deinit ()
{
if (cc != NULL) {
cc->deinit( rnd_ctx);
}
return;
}
int
_gnutls_rnd (int level, void *data, int len)
{
int ret = GC_OK;
if (len > 0) {
if (cc != NULL) {
return cc->rnd( rnd_ctx, level, data, len);
}
if (level == RND_NONCE)
ret = gc_nonce (data, len);
else
ret = gc_pseudo_random( data, len);
}
if (ret == GC_OK) return 0;
else return GNUTLS_E_RANDOM_FAILED;
}
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