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
42 #include <heim_threads.h>
46 volatile static HCRYPTPROV g_cryptprovider
= 0;
49 _hc_CryptProvider(void)
52 HCRYPTPROV cryptprovider
= 0;
54 if (g_cryptprovider
!= 0)
55 return g_cryptprovider
;
57 rv
= CryptAcquireContext(&cryptprovider
, NULL
,
58 MS_ENHANCED_PROV
, PROV_RSA_FULL
,
61 if (GetLastError() == NTE_BAD_KEYSET
) {
62 rv
= CryptAcquireContext(&cryptprovider
, NULL
,
63 MS_ENHANCED_PROV
, PROV_RSA_FULL
,
68 /* try the default provider */
69 rv
= CryptAcquireContext(&cryptprovider
, NULL
, 0, PROV_RSA_FULL
,
72 if (GetLastError() == NTE_BAD_KEYSET
) {
73 rv
= CryptAcquireContext(&cryptprovider
, NULL
,
74 MS_ENHANCED_PROV
, PROV_RSA_FULL
,
80 /* try just a default random number generator */
81 rv
= CryptAcquireContext(&cryptprovider
, NULL
, 0, PROV_RNG
,
86 InterlockedCompareExchangePointer((PVOID
*) &g_cryptprovider
,
87 (PVOID
) cryptprovider
, 0) != 0) {
89 CryptReleaseContext(cryptprovider
, 0);
90 cryptprovider
= g_cryptprovider
;
102 w32crypto_seed(const void *indata
, int size
)
108 w32crypto_bytes(unsigned char *outdata
, int size
)
110 if (CryptGenRandom(_hc_CryptProvider(), size
, outdata
))
116 w32crypto_cleanup(void)
118 HCRYPTPROV cryptprovider
;
120 if (InterlockedCompareExchangePointer((PVOID
*) &cryptprovider
,
121 0, (PVOID
) g_cryptprovider
) == 0) {
122 CryptReleaseContext(cryptprovider
, 0);
127 w32crypto_add(const void *indata
, int size
, double entropi
)
132 w32crypto_status(void)
134 if (_hc_CryptProvider() == 0)
139 const RAND_METHOD hc_rand_w32crypto_method
= {
149 RAND_w32crypto_method(void)
151 return &hc_rand_w32crypto_method
;