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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* daemon/nonce.c
*
* Entropy key nonce generation
*
* Copyright 2009 Simtec Electronics
*
* For licence terms refer to the COPYING file.
*/
#include <stdbool.h>
#include <stdint.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include "nonce.h"
#if defined(EKEY_OS_OPENBSD) || defined(EKEY_OS_MIRBSD)
#include <stdlib.h>
/* exported interface documented in nonce.h */
bool
fill_nonce(uint8_t *buff, size_t count)
{
arc4random_buf(buff, count);
return true;
}
/* exported interface documented in nonce.h */
void
close_nonce(void)
{
}
#else
/** File descriptor for the urandom device. */
static int noncefd = -2;
/* exported interface documented in nonce.h */
bool
fill_nonce(uint8_t *buff, size_t count)
{
int rd;
bool status = true;
if (noncefd < 0) {
if (noncefd == -2) {
noncefd = open("/dev/urandom", O_RDONLY);
}
if (noncefd < 0) {
syslog(LOG_ERR, "Unable to prepare nonce");
return false;
}
}
rd = read(noncefd, buff, count);
if (rd < 0) {
syslog(LOG_ERR, "Error %s reading nonce data", strerror(errno));
status = false;
} else if (rd != count) {
syslog(LOG_ERR, "Short read of nonce data (%d/%zd)", rd, count);
status = false;
}
return status;
}
/* exported interface documented in nonce.h */
void
close_nonce(void)
{
if (noncefd >=0 ) {
close(noncefd);
}
noncefd = -2;
}
#endif
|
