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/*
* Copyright (C) 2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUTLS 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <gnutls_int.h>
#include <gnutls_random.h>
#include <gnutls_errors.h>
#ifndef USE_GCRYPT
# ifdef HAVE_UNISTD_H
# include <unistd.h>
# endif
# include <sys/types.h>
# include <sys/stat.h>
# include <fcntl.h>
# ifdef HAVE_SYS_TIME_H
# include <sys/time.h>
# endif
#endif
int _gnutls_get_random(opaque * res, int bytes, int dev)
{
#ifndef USE_GCRYPT
int fd;
struct timeval tv;
char prand[16];
char *device;
switch(dev) {
case 1:
device = "/dev/random";
break;
default:
device = "dev/urandom";
}
fd = open(device, O_RDONLY);
if (device == NULL || fd < 0) {
gettimeofday(&tv, (struct timezone *) 0);
memcpy(prand, &tv, sizeof(tv));
fd = getpid();
memcpy(&prand[8], &fd, sizeof(fd));
fd = clock();
memcpy(&prand[12], &fd, sizeof(fd));
memset(res, 0, bytes);
if (bytes > 16)
bytes = 16;
memcpy(res, prand, bytes);
} else {
read(fd, res, bytes);
close(fd);
}
return 0;
#else /* using gcrypt */
char* buf;
buf = gcry_random_bytes(bytes, dev);
if (buf==NULL) {
gnutls_assert();
return GNUTLS_E_MEMORY_ERROR;
}
memcpy( res, buf, bytes);
gcry_free(buf);
return 0;
#endif
}
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