mirror of https://github.com/openssl/openssl
104 lines
2.7 KiB
C
104 lines
2.7 KiB
C
/*
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* Copyright 1995-2017 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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# ifndef OPENSSL_RAND_SEED_OS
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# error "Unsupported seeding method configured; must be os"
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# endif
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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 USE_BCRYPTGENRANDOM
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# endif
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# ifdef USE_BCRYPTGENRANDOM
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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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int RAND_poll(void)
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{
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# ifndef USE_BCRYPTGENRANDOM
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HCRYPTPROV hProvider;
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# endif
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DWORD w;
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BYTE buf[RANDOMNESS_NEEDED];
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int ok = 0;
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# ifdef OPENSSL_RAND_SEED_RDTSC
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rand_rdtsc();
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# endif
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# ifdef OPENSSL_RAND_SEED_RDCPU
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if (rand_rdcpu())
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ok++;
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# endif
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# ifdef USE_BCRYPTGENRANDOM
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if (BCryptGenRandom(NULL, buf, (ULONG)sizeof(buf),
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BCRYPT_USE_SYSTEM_PREFERRED_RNG) != STATUS_SUCCESS)
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return 0;
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RAND_add(buf, sizeof(buf), sizeof(buf));
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return 1;
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# else
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/* poll the CryptoAPI PRNG */
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if (CryptAcquireContextW(&hProvider, NULL, NULL, PROV_RSA_FULL,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT) != 0) {
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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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ok++;
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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,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT) != 0) {
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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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ok++;
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}
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CryptReleaseContext(hProvider, 0);
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}
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# endif
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return ok ? 1 : 0;
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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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#endif
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