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- /*
- * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
- *
- * Licensed under the OpenSSL license (the "License"). You may not use
- * this file except in compliance with the License. You can obtain a copy
- * in the file LICENSE in the source distribution or at
- * https://www.openssl.org/source/license.html
- */
- #include "internal/cryptlib.h"
- #include <openssl/rand.h>
- #include "rand_lcl.h"
- #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
- # include <windows.h>
- /* On Windows 7 or higher use BCrypt instead of the legacy CryptoAPI */
- # if defined(_MSC_VER) && defined(_WIN32_WINNT) && _WIN32_WINNT>=0x0601
- # define RAND_WINDOWS_USE_BCRYPT
- # endif
- # ifdef RAND_WINDOWS_USE_BCRYPT
- # include <bcrypt.h>
- # pragma comment(lib, "bcrypt.lib")
- # ifndef STATUS_SUCCESS
- # define STATUS_SUCCESS ((NTSTATUS)0x00000000L)
- # endif
- # else
- # include <wincrypt.h>
- /*
- * Intel hardware RNG CSP -- available from
- * http://developer.intel.com/design/security/rng/redist_license.htm
- */
- # define PROV_INTEL_SEC 22
- # define INTEL_DEF_PROV L"Intel Hardware Cryptographic Service Provider"
- # endif
- static void readtimer(void);
- int RAND_poll(void)
- {
- MEMORYSTATUS mst;
- # ifndef RAND_WINDOWS_USE_BCRYPT
- HCRYPTPROV hProvider;
- # endif
- DWORD w;
- BYTE buf[64];
- # ifdef RAND_WINDOWS_USE_BCRYPT
- if (BCryptGenRandom(NULL, buf, (ULONG)sizeof(buf), BCRYPT_USE_SYSTEM_PREFERRED_RNG) == STATUS_SUCCESS) {
- RAND_add(buf, sizeof(buf), sizeof(buf));
- }
- # else
- /* poll the CryptoAPI PRNG */
- /* The CryptoAPI returns sizeof(buf) bytes of randomness */
- if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
- if (CryptGenRandom(hProvider, (DWORD)sizeof(buf), buf) != 0) {
- RAND_add(buf, sizeof(buf), sizeof(buf));
- }
- CryptReleaseContext(hProvider, 0);
- }
- /* poll the Pentium PRG with CryptoAPI */
- if (CryptAcquireContextW(&hProvider, NULL, INTEL_DEF_PROV, PROV_INTEL_SEC, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) {
- if (CryptGenRandom(hProvider, (DWORD)sizeof(buf), buf) != 0) {
- RAND_add(buf, sizeof(buf), sizeof(buf));
- }
- CryptReleaseContext(hProvider, 0);
- }
- # endif
- /* timer data */
- readtimer();
- /* memory usage statistics */
- GlobalMemoryStatus(&mst);
- RAND_add(&mst, sizeof(mst), 1);
- /* process ID */
- w = GetCurrentProcessId();
- RAND_add(&w, sizeof(w), 1);
- return (1);
- }
- #if OPENSSL_API_COMPAT < 0x10100000L
- int RAND_event(UINT iMsg, WPARAM wParam, LPARAM lParam)
- {
- RAND_poll();
- return RAND_status();
- }
- void RAND_screen(void)
- {
- RAND_poll();
- }
- #endif
- /* feed timing information to the PRNG */
- static void readtimer(void)
- {
- DWORD w;
- LARGE_INTEGER l;
- static int have_perfc = 1;
- # if defined(_MSC_VER) && defined(_M_X86)
- static int have_tsc = 1;
- DWORD cyclecount;
- if (have_tsc) {
- __try {
- __asm {
- _emit 0x0f _emit 0x31 mov cyclecount, eax}
- RAND_add(&cyclecount, sizeof(cyclecount), 1);
- }
- __except(EXCEPTION_EXECUTE_HANDLER) {
- have_tsc = 0;
- }
- }
- # else
- # define have_tsc 0
- # endif
- if (have_perfc) {
- if (QueryPerformanceCounter(&l) == 0)
- have_perfc = 0;
- else
- RAND_add(&l, sizeof(l), 0);
- }
- if (!have_tsc && !have_perfc) {
- w = GetTickCount();
- RAND_add(&w, sizeof(w), 0);
- }
- }
- #endif
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