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1 | /* $OpenBSD$ */ |
2 | ||
3 | /* | |
4 | * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org> | |
5 | * Copyright (c) 2014, Bob Beck <beck@obtuse.com> | |
6 | * | |
7 | * Permission to use, copy, modify, and distribute this software for any | |
8 | * purpose with or without fee is hereby granted, provided that the above | |
9 | * copyright notice and this permission notice appear in all copies. | |
10 | * | |
11 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
12 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
13 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
14 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
15 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
16 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
17 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
18 | */ | |
19 | ||
20 | #include <windows.h> | |
21 | #include <errno.h> | |
22 | #include <stdint.h> | |
23 | #include <sys/types.h> | |
24 | #include <wincrypt.h> | |
25 | #include <process.h> | |
26 | ||
27 | int getentropy(void *buf, size_t len); | |
28 | ||
29 | /* | |
30 | * On Windows, CryptGenRandom is supposed to be a well-seeded | |
31 | * cryptographically strong random number generator. | |
32 | */ | |
33 | int | |
34 | getentropy(void *buf, size_t len) | |
35 | { | |
36 | HCRYPTPROV provider; | |
37 | ||
38 | if (len > 256) { | |
39 | errno = EIO; | |
40 | return -1; | |
41 | } | |
42 | ||
43 | if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL, | |
44 | CRYPT_VERIFYCONTEXT) == 0) | |
45 | goto fail; | |
46 | if (CryptGenRandom(provider, len, buf) == 0) { | |
47 | CryptReleaseContext(provider, 0); | |
48 | goto fail; | |
49 | } | |
50 | CryptReleaseContext(provider, 0); | |
51 | return (0); | |
52 | ||
53 | fail: | |
54 | errno = EIO; | |
55 | return (-1); | |
56 | } |