1/*	$NetBSD$	*/
2
3/*
4 * Copyright (c) 2006 Kungliga Tekniska H��gskolan
5 * (Royal Institute of Technology, Stockholm, Sweden).
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * 3. Neither the name of the Institute nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <config.h>
37#include <krb5/roken.h>
38
39#include <wincrypt.h>
40
41#include <stdio.h>
42#include <stdlib.h>
43#include <rand.h>
44#include <heim_threads.h>
45
46#include "randi.h"
47
48volatile static HCRYPTPROV g_cryptprovider = 0;
49
50static HCRYPTPROV
51_hc_CryptProvider(void)
52{
53    BOOL rv;
54    HCRYPTPROV cryptprovider = 0;
55
56    if (g_cryptprovider != 0)
57	return g_cryptprovider;
58
59    rv = CryptAcquireContext(&cryptprovider, NULL,
60			      MS_ENHANCED_PROV, PROV_RSA_FULL,
61			      0);
62
63    if (GetLastError() == NTE_BAD_KEYSET) {
64        if(!rv)
65            rv = CryptAcquireContext(&cryptprovider, NULL,
66                                      MS_ENHANCED_PROV, PROV_RSA_FULL,
67                                      CRYPT_NEWKEYSET);
68    }
69
70    if (rv &&
71        InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
72					  (PVOID) cryptprovider, 0) != 0) {
73
74        CryptReleaseContext(cryptprovider, 0);
75        cryptprovider = g_cryptprovider;
76    }
77
78    return cryptprovider;
79}
80
81/*
82 *
83 */
84
85
86static void
87w32crypto_seed(const void *indata, int size)
88{
89}
90
91
92static int
93w32crypto_bytes(unsigned char *outdata, int size)
94{
95    if (CryptGenRandom(_hc_CryptProvider(), size, outdata))
96	return 1;
97    return 0;
98}
99
100static void
101w32crypto_cleanup(void)
102{
103}
104
105static void
106w32crypto_add(const void *indata, int size, double entropi)
107{
108}
109
110static int
111w32crypto_status(void)
112{
113    if (_hc_CryptProvider() == 0)
114	return 0;
115    return 1;
116}
117
118const RAND_METHOD hc_rand_w32crypto_method = {
119    w32crypto_seed,
120    w32crypto_bytes,
121    w32crypto_cleanup,
122    w32crypto_add,
123    w32crypto_bytes,
124    w32crypto_status
125};
126
127const RAND_METHOD *
128RAND_w32crypto_method(void)
129{
130    return &hc_rand_w32crypto_method;
131}
132