4 * Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
5 * Copyright (c) 2014, Bob Beck <beck@obtuse.com>
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.
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.
23 #include <sys/types.h>
27 int getentropy(void *buf, size_t len);
30 * On Windows, CryptGenRandom is supposed to be a well-seeded
31 * cryptographically strong random number generator.
34 getentropy(void *buf, size_t len)
43 if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL,
44 CRYPT_VERIFYCONTEXT) == 0)
46 if (CryptGenRandom(provider, len, buf) == 0) {
47 CryptReleaseContext(provider, 0);
50 CryptReleaseContext(provider, 0);