1 /* $NetBSD: rand-w32.c,v 1.1.1.1 2011/04/13 18:14:50 elric 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 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 86 static void 87 w32crypto_seed(const void *indata, int size) 88 { 89 } 90 91 92 static int 93 w32crypto_bytes(unsigned char *outdata, int size) 94 { 95 if (CryptGenRandom(_hc_CryptProvider(), size, outdata)) 96 return 1; 97 return 0; 98 } 99 100 static void 101 w32crypto_cleanup(void) 102 { 103 } 104 105 static void 106 w32crypto_add(const void *indata, int size, double entropi) 107 { 108 } 109 110 static int 111 w32crypto_status(void) 112 { 113 if (_hc_CryptProvider() == 0) 114 return 0; 115 return 1; 116 } 117 118 const 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 }; 126 127 const RAND_METHOD * 128 RAND_w32crypto_method(void) 129 { 130 return &hc_rand_w32crypto_method; 131 } 132