crypto/external/bsd/heimdal/dist/lib/hcrypto/rand-w32.c

   1 /*      $NetBSD: rand-w32.c,v 1.1.1.2 2014/04/24 12:45:30 pettai Exp $  */
   2
   3 /*
   4  * Copyright (c) 2006 Kungliga Tekniska Högskolan
   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
  48 volatile static HCRYPTPROV g_cryptprovider = 0;
  49
  50 static 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                               CRYPT_VERIFYCONTEXT);
  62
  63     if (GetLastError() == NTE_BAD_KEYSET) {
  64         rv = CryptAcquireContext(&cryptprovider, NULL,
  65                                  MS_ENHANCED_PROV, PROV_RSA_FULL,
  66                                  CRYPT_NEWKEYSET);
  67     }
  68
  69     if (rv) {
  70         /* try the default provider */
  71         rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RSA_FULL,
  72                                  CRYPT_VERIFYCONTEXT);
  73
  74         if (GetLastError() == NTE_BAD_KEYSET) {
  75             rv = CryptAcquireContext(&cryptprovider, NULL,
  76                                      MS_ENHANCED_PROV, PROV_RSA_FULL,
  77                                      CRYPT_NEWKEYSET);
  78         }
  79     }
  80
  81     if (rv) {
  82         /* try just a default random number generator */
  83         rv = CryptAcquireContext(&cryptprovider, NULL, 0, PROV_RNG,
  84                                  CRYPT_VERIFYCONTEXT);
  85     }
  86
  87     if (rv &&
  88         InterlockedCompareExchangePointer((PVOID *) &g_cryptprovider,
  89                                           (PVOID) cryptprovider, 0) != 0) {
  90
  91         CryptReleaseContext(cryptprovider, 0);
  92         cryptprovider = g_cryptprovider;
  93     }
  94
  95     return cryptprovider;
  96 }
  97
  98 /*
  99  *
 100  */
 101
 102
 103 static void
 104 w32crypto_seed(const void *indata, int size)
 105 {
 106 }
 107
 108
 109 static int
 110 w32crypto_bytes(unsigned char *outdata, int size)
 111 {
 112     if (CryptGenRandom(_hc_CryptProvider(), size, outdata))
 113         return 1;
 114     return 0;
 115 }
 116
 117 static void
 118 w32crypto_cleanup(void)
 119 {
 120     HCRYPTPROV cryptprovider;
 121
 122     if (InterlockedCompareExchangePointer((PVOID *) &cryptprovider,
 123                                           0, (PVOID) g_cryptprovider) == 0) {
 124         CryptReleaseContext(cryptprovider, 0);
 125     }
 126 }
 127
 128 static void
 129 w32crypto_add(const void *indata, int size, double entropi)
 130 {
 131 }
 132
 133 static int
 134 w32crypto_status(void)
 135 {
 136     if (_hc_CryptProvider() == 0)
 137         return 0;
 138     return 1;
 139 }
 140
 141 const RAND_METHOD hc_rand_w32crypto_method = {
 142     w32crypto_seed,
 143     w32crypto_bytes,
 144     w32crypto_cleanup,
 145     w32crypto_add,
 146     w32crypto_bytes,
 147     w32crypto_status
 148 };
 149
 150 const RAND_METHOD *
 151 RAND_w32crypto_method(void)
 152 {
 153     return &hc_rand_w32crypto_method;
 154 }