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 } 155