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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* Copyright (c) 1995, 1996, 1997, 1999, 2007 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <rand.h>
#include <roken.h>
#include "randi.h"
#ifndef WIN32 /* don't bother with this on windows */
static volatile int counter;
static volatile unsigned char *gdata; /* Global data */
static volatile int igdata; /* Index into global data */
static int gsize;
static
RETSIGTYPE
sigALRM(int sig)
{
if (igdata < gsize)
gdata[igdata++] ^= counter & 0xff;
#ifndef HAVE_SIGACTION
signal(SIGALRM, sigALRM); /* Reinstall SysV signal handler */
#endif
SIGRETURN(0);
}
#ifndef HAVE_SETITIMER
static void
pacemaker(struct timeval *tv)
{
fd_set fds;
pid_t pid;
pid = getppid();
while(1){
FD_ZERO(&fds);
FD_SET(0, &fds);
select(1, &fds, NULL, NULL, tv);
kill(pid, SIGALRM);
}
}
#endif
#ifdef HAVE_SIGACTION
/* XXX ugly hack, should perhaps use function from roken */
static RETSIGTYPE
(*fake_signal(int sig, RETSIGTYPE (*f)(int)))(int)
{
struct sigaction sa, osa;
sa.sa_handler = f;
sa.sa_flags = 0;
sigemptyset(&sa.sa_mask);
sigaction(sig, &sa, &osa);
return osa.sa_handler;
}
#define signal(S, F) fake_signal((S), (F))
#endif
#endif /* WIN32*/
/*
*
*/
static void
timer_seed(const void *indata, int size)
{
}
static int
timer_bytes(unsigned char *outdata, int size)
{
#ifdef WIN32
return 0;
#else /* WIN32 */
struct itimerval tv, otv;
RETSIGTYPE (*osa)(int);
int i, j;
#ifndef HAVE_SETITIMER
RETSIGTYPE (*ochld)(int);
pid_t pid;
#endif
gdata = outdata;
gsize = size;
igdata = 0;
osa = signal(SIGALRM, sigALRM);
/* Start timer */
tv.it_value.tv_sec = 0;
tv.it_value.tv_usec = 10 * 1000; /* 10 ms */
tv.it_interval = tv.it_value;
#ifdef HAVE_SETITIMER
setitimer(ITIMER_REAL, &tv, &otv);
#else
ochld = signal(SIGCHLD, SIG_IGN);
pid = fork();
if(pid == -1){
signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL);
des_not_rand_data(data, size);
return;
}
if(pid == 0)
pacemaker(&tv.it_interval);
#endif
for(i = 0; i < 4; i++) {
for (igdata = 0; igdata < size;) /* igdata++ in sigALRM */
counter++;
for (j = 0; j < size; j++) /* Only use 2 bits each lap */
gdata[j] = (gdata[j]>>2) | (gdata[j]<<6);
}
#ifdef HAVE_SETITIMER
setitimer(ITIMER_REAL, &otv, 0);
#else
kill(pid, SIGKILL);
while(waitpid(pid, NULL, 0) != pid);
signal(SIGCHLD, ochld != SIG_ERR ? ochld : SIG_DFL);
#endif
signal(SIGALRM, osa != SIG_ERR ? osa : SIG_DFL);
return 1;
#endif
}
static void
timer_cleanup(void)
{
}
static void
timer_add(const void *indata, int size, double entropi)
{
}
static int
timer_pseudorand(unsigned char *outdata, int size)
{
return timer_bytes(outdata, size);
}
static int
timer_status(void)
{
#ifdef WIN32
return 0;
#else
return 1;
#endif
}
const RAND_METHOD hc_rand_timer_method = {
timer_seed,
timer_bytes,
timer_cleanup,
timer_add,
timer_pseudorand,
timer_status
};
const RAND_METHOD *
RAND_timer_method(void)
{
return &hc_rand_timer_method;
}
|
