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getentropy from Theo de Raadt

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git-svn-id: file:///svn/unbound/trunk@3189 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2014-07-12 20:19:14 +00:00
parent b32a248a42
commit 10e378f13b
1 changed files with 39 additions and 49 deletions
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88
compat/getentropy_win.c
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@ -1,65 +1,55 @@
/* getentropy_win.c - get entropy on Windows.
*
* Copyright (c) 2014, NLnet Labs. All rights reserved.
/* $OpenBSD$ */
/*
* Copyright (c) 2014, Theo de Raadt <deraadt@openbsd.org>
* Copyright (c) 2014, Bob Beck <beck@obtuse.com>
*
* This software is open source.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of the NLNET LABS nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include "config.h"
#include <stdint.h>
#include <sys/types.h>
#include <wincrypt.h>
#include <process.h>
int getentropy(void *buf, size_t len);
/*
* On Windows, CryptGenRandom is supposed to be a well-seeded
* cryptographically strong random number generator.
*/
int
getentropy(void *buf, size_t len)
{
HMODULE lib;
HCRYPTPROV provider;
if(len > 256) {
if (len > 256) {
errno = EIO;
return -1;
}
/* Get entropy with windows secure random number generator,
* for windows XP and later, it is in the ADVAPI32 dll */
lib = LoadLibrary("ADVAPI32.DLL");
if(lib) {
/* Load the RtlGenRandom function */
BOOLEAN (APIENTRY* genrandom)(void*,ULONG) =
(BOOLEAN (APIENTRY*)(void*,ULONG))
GetProcAddress(lib, "SystemFunction036");
if(genrandom) {
if(genrandom(buf, len)) {
FreeLibrary(lib);
return 0; /* success */
}
}
FreeLibrary(lib);
if (CryptAcquireContext(&provider, NULL, NULL, PROV_RSA_FULL,
CRYPT_VERIFYCONTEXT) != 0)
goto fail;
if (CryptGenRandom(provider, len, buf) != 0) {
CryptReleaseContext(provider, 0);
goto fail;
}
CryptReleaseContext(provider, 0);
return (0);
fail:
errno = EIO;
return -1;
return (-1);
}