2 * Copyright (c) 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 #include <heim_threads.h>
44 volatile static HCRYPTPROV g_cryptprovider;
47 _hc_CryptProvider(void)
50 HCRYPTPROV cryptprovider = (HCRYPTPROV)0;
55 rv = CryptAcquireContext(&cryptprovider, NULL,
56 MS_ENHANCED_PROV, PROV_RSA_FULL,
59 if (GetLastError() == NTE_BAD_KEYSET) {
60 rv = CryptAcquireContext(&cryptprovider, NULL,
61 MS_ENHANCED_PROV, PROV_RSA_FULL,
66 /* try the default provider */
67 rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RSA_FULL,
70 if (GetLastError() == NTE_BAD_KEYSET) {
71 rv = CryptAcquireContext(&cryptprovider, NULL,
72 MS_ENHANCED_PROV, PROV_RSA_FULL,
78 /* try just a default random number generator */
79 rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RNG,
84 InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
85 (PVOID) cryptprovider, NULL) != 0) {
87 CryptReleaseContext(cryptprovider, 0);
91 return g_cryptprovider;
100 w32crypto_seed(const void *indata, int size)
106 w32crypto_bytes(unsigned char *outdata, int size)
108 if (CryptGenRandom(_hc_CryptProvider(), size, outdata))
114 w32crypto_cleanup(void)
116 HCRYPTPROV cryptprovider;
118 if (InterlockedCompareExchangePointer((PVOID *) &cryptprovider,
119 0, (PVOID) g_cryptprovider) == 0) {
120 CryptReleaseContext(cryptprovider, 0);
125 w32crypto_add(const void *indata, int size, double entropi)
130 w32crypto_status(void)
132 if (_hc_CryptProvider() == 0)
137 const RAND_METHOD hc_rand_w32crypto_method = {
147 RAND_w32crypto_method(void)
149 return &hc_rand_w32crypto_method;