1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/*
* Copyright (C) 2001 Nikos Mavroyanopoulos
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/* Functions to return random bytes.
*/
#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>
#endif
/* fills the buffer 'res' with random bytes of 'bytes' long.
* level is WEAK, STRONG, or VERY_STRONG (libgcrypt)
*/
int _gnutls_get_random(opaque * res, int bytes, int level)
{
#ifndef USE_GCRYPT
int fd;
char *device;
device = "dev/urandom";
fd = open(device, O_RDONLY);
if (device == NULL || fd < 0) {
_gnutls_log( "Could not open random device\n");
return GNUTLS_E_FILE_ERROR;
} else {
read(fd, res, bytes);
close(fd);
}
return 0;
#else /* using gcrypt */
gcry_randomize( res, bytes, level);
return 0;
#endif
}
|
