7b8fa4758c
Since at least SDK V6.1 HCRYPTPROV has been specified as ULONG_PTR this means that comparing or setting one with NULL causes a cast warning. Use an explicit cast from zero to that type.
151 lines
4.0 KiB
C
151 lines
4.0 KiB
C
/*
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* Copyright (c) 2006 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <config.h>
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#include <roken.h>
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#include <wincrypt.h>
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#include <rand.h>
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#include <heim_threads.h>
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#include "randi.h"
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volatile static HCRYPTPROV g_cryptprovider;
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static HCRYPTPROV
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_hc_CryptProvider(void)
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{
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BOOL rv;
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HCRYPTPROV cryptprovider = (HCRYPTPROV)0;
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if (g_cryptprovider)
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goto out;
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rv = CryptAcquireContext(&cryptprovider, NULL,
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MS_ENHANCED_PROV, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT);
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if (GetLastError() == NTE_BAD_KEYSET) {
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rv = CryptAcquireContext(&cryptprovider, NULL,
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MS_ENHANCED_PROV, PROV_RSA_FULL,
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CRYPT_NEWKEYSET);
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}
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if (rv) {
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/* try the default provider */
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rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT);
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if (GetLastError() == NTE_BAD_KEYSET) {
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rv = CryptAcquireContext(&cryptprovider, NULL,
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MS_ENHANCED_PROV, PROV_RSA_FULL,
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CRYPT_NEWKEYSET);
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}
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}
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if (rv) {
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/* try just a default random number generator */
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rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RNG,
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CRYPT_VERIFYCONTEXT);
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}
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if (rv == 0 &&
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InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
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(PVOID) cryptprovider, NULL) != 0) {
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CryptReleaseContext(cryptprovider, 0);
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}
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out:
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return g_cryptprovider;
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}
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/*
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*
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*/
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static void
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w32crypto_seed(const void *indata, int size)
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{
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}
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static int
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w32crypto_bytes(unsigned char *outdata, int size)
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{
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if (CryptGenRandom(_hc_CryptProvider(), size, outdata))
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return 1;
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return 0;
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}
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static void
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w32crypto_cleanup(void)
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{
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HCRYPTPROV cryptprovider;
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if (InterlockedCompareExchangePointer((PVOID *) &cryptprovider,
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0, (PVOID) g_cryptprovider) == 0) {
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CryptReleaseContext(cryptprovider, 0);
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}
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}
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static void
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w32crypto_add(const void *indata, int size, double entropi)
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{
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}
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static int
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w32crypto_status(void)
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{
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if (_hc_CryptProvider() == 0)
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return 0;
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return 1;
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}
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const RAND_METHOD hc_rand_w32crypto_method = {
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w32crypto_seed,
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w32crypto_bytes,
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w32crypto_cleanup,
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w32crypto_add,
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w32crypto_bytes,
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w32crypto_status
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};
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const RAND_METHOD *
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RAND_w32crypto_method(void)
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{
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return &hc_rand_w32crypto_method;
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}
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