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