2 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 #include "internal/cryptlib.h"
11 #include <openssl/rand.h>
14 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
16 # if defined(_MSC_VER) && defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0601
18 # pragma comment(lib, "bcrypt.lib")
21 # define _WIN32_WINNT 0x0400
23 # include <wincrypt.h>
25 * Intel hardware RNG CSP -- available from
26 * http://developer.intel.com/design/security/rng/redist_license.htm
28 # define PROV_INTEL_SEC 22
29 # define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
32 static void readtimer(void);
37 # if !(defined(_MSC_VER) && defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0601)
38 HCRYPTPROV hProvider = 0;
43 # if defined(_MSC_VER) && defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0601
44 if (BCryptGenRandom(NULL, buf, (ULONG)sizeof(buf), BCRYPT_USE_SYSTEM_PREFERRED_RNG) == 0) {
45 RAND_add(buf, sizeof(buf), sizeof(buf));
48 /* poll the CryptoAPI PRNG */
49 /* The CryptoAPI returns sizeof(buf) bytes of randomness */
50 if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
51 if (CryptGenRandom(hProvider, sizeof(buf), buf) != 0) {
52 RAND_add(buf, sizeof(buf), sizeof(buf));
54 CryptReleaseContext(hProvider, 0);
57 /* poll the Pentium PRG with CryptoAPI */
58 if (CryptAcquireContextW(&hProvider, NULL, INTEL_DEF_PROV, PROV_INTEL_SEC, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
59 if (CryptGenRandom(hProvider, sizeof(buf), buf) != 0) {
60 RAND_add(buf, sizeof(buf), sizeof(buf));
62 CryptReleaseContext(hProvider, 0);
69 /* memory usage statistics */
70 GlobalMemoryStatus(&mst);
71 RAND_add(&mst, sizeof(mst), 1);
74 w = GetCurrentProcessId();
75 RAND_add(&w, sizeof(w), 1);
80 #if OPENSSL_API_COMPAT < 0x00101000L
81 int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
87 void RAND_screen(void)
93 /* feed timing information to the PRNG */
94 static void readtimer(void)
98 static int have_perfc = 1;
99 # if defined(_MSC_VER) && defined(_M_X86)
100 static int have_tsc = 1;
106 _emit 0x0f _emit 0x31 mov cyclecount, eax}
107 RAND_add(&cyclecount, sizeof(cyclecount), 1);
109 __except(EXCEPTION_EXECUTE_HANDLER) {
118 if (QueryPerformanceCounter(&l) == 0)
121 RAND_add(&l, sizeof(l), 0);
124 if (!have_tsc && !have_perfc) {
126 RAND_add(&w, sizeof(w), 0);