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97 lines
2.3 KiB
C
97 lines
2.3 KiB
C
/* Copyright (C) 2007-2017 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author Victor Julien <victor@inliniac.net>
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*
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* Functions for getting a random value based on
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* SEI CERT C Coding Standard MSC30-C
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*/
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#include "suricata-common.h"
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#include "util-random.h"
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#if defined(HAVE_WINCRYPT_H) && defined(OS_WIN32)
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#include <wincrypt.h>
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long int RandomGet(void)
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{
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if (g_disable_randomness)
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return 0;
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HCRYPTPROV p;
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if (!(CryptAcquireContext(&p, NULL, NULL,
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PROV_RSA_FULL, 0))) {
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return -1;
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}
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long int value = 0;
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if (!CryptGenRandom(p, sizeof(value), (BYTE *)&value)) {
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(void)CryptReleaseContext(p, 0);
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return -1;
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}
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(void)CryptReleaseContext(p, 0);
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return value;
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}
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#elif defined(HAVE_GETRANDOM)
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long int RandomGet(void)
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{
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if (g_disable_randomness)
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return 0;
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long int value = 0;
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int ret = getrandom(&value, sizeof(value), 0);
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/* ret should be sizeof(value), but if it is > 0 and < sizeof(value)
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* it's still better than nothing so we return what we have */
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if (ret <= 0) {
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return -1;
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}
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return value;
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}
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#elif defined(HAVE_CLOCK_GETTIME)
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long int RandomGet(void)
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{
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if (g_disable_randomness)
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return 0;
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struct timespec ts;
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clock_gettime(CLOCK_REALTIME, &ts);
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srandom(ts.tv_nsec ^ ts.tv_sec);
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long int value = random();
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return value;
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}
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#else
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long int RandomGet(void)
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{
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if (g_disable_randomness)
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return 0;
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struct timeval tv;
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memset(&tv, 0, sizeof(tv));
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gettimeofday(&tv, NULL);
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srandom(tv.tv_usec ^ tv.tv_sec);
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long int value = random();
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return value;
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}
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#endif
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