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/*
* Ouroboros - Copyright (C) 2016 - 2021
*
* Pseudo random generator
*
* Dimitri Staessens <dimitri@ouroboros.rocks>
* Sander Vrijders <sander@ouroboros.rocks>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* 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., http://www.fsf.org/about/contact/.
*/
#include "config.h"
#include <ouroboros/random.h>
#if defined(__APPLE__) /* Barf */
#undef __OSX_AVAILABLE
#define __OSX_AVAILABLE(arg)
#undef __IOS_AVAILABLE
#define __IOS_AVAILABLE(arg)
#undef __TVOS_AVAILABLE
#define __TVOS_AVAILABLE(arg)
#undef __WATCHOS_AVAILABLE
#define __WATCHOS_AVAILABLE(arg)
#include <sys/random.h>
#elif defined(HAVE_SYS_RANDOM)
#include <sys/random.h>
#elif defined(HAVE_LIBGCRYPT)
#include <gcrypt.h>
#elif defined(__FreeBSD__)
#include <stdlib.h>
#elif defined(HAVE_OPENSSL_RNG)
#include <openssl/rand.h>
#include <limits.h>
#endif
int random_buffer(void * buf,
size_t len)
{
#if defined(__APPLE__)
return getentropy(buf, len);
#elif defined(__FreeBSD__)
arc4random_buf(buf, len);
return 0;
#elif defined(HAVE_SYS_RANDOM)
return getrandom(buf, len, GRND_NONBLOCK); /* glibc 2.25 */
#elif defined(HAVE_LIBGCRYPT)
gcry_randomize(buf, len, GCRY_STRONG_RANDOM);
return 0;
#elif defined(HAVE_OPENSSL_RNG)
if (len > 0 && len < INT_MAX)
return RAND_bytes((unsigned char *) buf, (int) len);
return -1;
#endif
}
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