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Commit	Line	Data
	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	}