Branch data Line data Source code
1 : : /* uECC_platform_specific.c - Implementation of platform specific functions*/
2 : :
3 : : /* Copyright (c) 2014, Kenneth MacKay
4 : : * All rights reserved.
5 : : *
6 : : * Redistribution and use in source and binary forms, with or without
7 : : * modification, are permitted provided that the following conditions are met:
8 : : * * Redistributions of source code must retain the above copyright notice,
9 : : * this list of conditions and the following disclaimer.
10 : : * * Redistributions in binary form must reproduce the above copyright notice,
11 : : * this list of conditions and the following disclaimer in the documentation
12 : : * and/or other materials provided with the distribution.
13 : : *
14 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
15 : : * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 : : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 : : * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
18 : : * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 : : * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 : : * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 : : * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 : : * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 : : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 : : * POSSIBILITY OF SUCH DAMAGE.*/
25 : :
26 : : /*
27 : : * Copyright (C) 2017 by Intel Corporation, All Rights Reserved.
28 : : *
29 : : * Redistribution and use in source and binary forms, with or without
30 : : * modification, are permitted provided that the following conditions are met:
31 : : *
32 : : * - Redistributions of source code must retain the above copyright notice,
33 : : * this list of conditions and the following disclaimer.
34 : : *
35 : : * - Redistributions in binary form must reproduce the above copyright
36 : : * notice, this list of conditions and the following disclaimer in the
37 : : * documentation and/or other materials provided with the distribution.
38 : : *
39 : : * - Neither the name of Intel Corporation nor the names of its contributors
40 : : * may be used to endorse or promote products derived from this software
41 : : * without specific prior written permission.
42 : : *
43 : : * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
44 : : * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
45 : : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
46 : : * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
47 : : * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
48 : : * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
49 : : * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
50 : : * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
51 : : * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
52 : : * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
53 : : * POSSIBILITY OF SUCH DAMAGE.
54 : : *
55 : : * uECC_platform_specific.c -- Implementation of platform specific functions
56 : : */
57 : :
58 : :
59 : : #if defined(unix) || defined(__linux__) || defined(__unix__) || \
60 : : defined(__unix) | (defined(__APPLE__) && defined(__MACH__)) || \
61 : : defined(uECC_POSIX)
62 : :
63 : : /* Some POSIX-like system with /dev/urandom or /dev/random. */
64 : : #include <sys/types.h>
65 : : #include <fcntl.h>
66 : : #include <unistd.h>
67 : :
68 : : #include <stdint.h>
69 : :
70 : : #ifndef O_CLOEXEC
71 : : #define O_CLOEXEC 0
72 : : #endif
73 : :
74 : 0 : int default_CSPRNG(uint8_t *dest, unsigned int size) {
75 : :
76 : : /* input sanity check: */
77 [ # # ]: 0 : if (dest == (uint8_t *) 0 || (size <= 0))
78 : : return 0;
79 : :
80 : 0 : int fd = open("/dev/urandom", O_RDONLY | O_CLOEXEC);
81 [ # # ]: 0 : if (fd == -1) {
82 : 0 : fd = open("/dev/random", O_RDONLY | O_CLOEXEC);
83 [ # # ]: 0 : if (fd == -1) {
84 : : return 0;
85 : : }
86 : : }
87 : :
88 : 0 : char *ptr = (char *)dest;
89 : 0 : size_t left = (size_t) size;
90 [ # # ]: 0 : while (left > 0) {
91 [ # # ]: 0 : ssize_t bytes_read = read(fd, ptr, left);
92 [ # # ]: 0 : if (bytes_read <= 0) { // read failed
93 : 0 : close(fd);
94 : 0 : return 0;
95 : : }
96 : 0 : left -= bytes_read;
97 : 0 : ptr += bytes_read;
98 : : }
99 : :
100 : 0 : close(fd);
101 : 0 : return 1;
102 : : }
103 : :
104 : : #endif /* platform */
105 : :
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