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1 office 1 /**
2 * @file BRandom2.c
3 * @author Ambroz Bizjak <ambrop7@gmail.com>
4 *
5 * @section LICENSE
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. Neither the name of the author nor the
15 * names of its contributors may be used to endorse or promote products
16 * derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
22 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
24 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
25 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
27 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29  
30 #include <unistd.h>
31 #include <sys/types.h>
32 #include <sys/stat.h>
33 #include <fcntl.h>
34  
35 #include "BRandom2.h"
36  
37 static int do_init (BRandom2 *o)
38 {
39 if (o->initialized) {
40 return 1;
41 }
42  
43 o->urandom_fd = open("/dev/urandom", O_RDONLY);
44 if (o->urandom_fd < 0) {
45 return 0;
46 }
47  
48 o->initialized = 1;
49  
50 return 1;
51 }
52  
53 int BRandom2_Init (BRandom2 *o, int flags)
54 {
55 ASSERT((flags & ~(BRANDOM2_INIT_LAZY)) == 0)
56  
57 o->initialized = 0;
58  
59 if (!(flags & BRANDOM2_INIT_LAZY) && !do_init(o)) {
60 return 0;
61 }
62  
63 DebugObject_Init(&o->d_obj);
64 return 1;
65 }
66  
67 void BRandom2_Free (BRandom2 *o)
68 {
69 DebugObject_Free(&o->d_obj);
70  
71 if (o->initialized) {
72 close(o->urandom_fd);
73 }
74 }
75  
76 int BRandom2_GenBytes (BRandom2 *o, void *out, size_t len)
77 {
78 DebugObject_Access(&o->d_obj);
79  
80 if (!do_init(o)) {
81 return 0;
82 }
83  
84 ssize_t res = read(o->urandom_fd, out, len);
85 if (res < 0 || res != len) {
86 return 0;
87 }
88  
89 return 1;
90 }