164 lines
4.8 KiB
C
164 lines
4.8 KiB
C
/*
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* Copyright 1995-2021 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (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 "crypto/rand_pool.h"
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#include "crypto/rand.h"
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#include "prov/seeding.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 Vista or higher use BCrypt instead of the legacy CryptoAPI */
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# if defined(_MSC_VER) && _MSC_VER > 1500 /* 1500 = Visual Studio 2008 */ \
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&& defined(_WIN32_WINNT) && _WIN32_WINNT >= 0x0600
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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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# ifdef _MSC_VER
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# pragma comment(lib, "bcrypt.lib")
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# endif
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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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size_t ossl_pool_acquire_entropy(RAND_POOL *pool)
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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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unsigned char *buffer;
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size_t bytes_needed;
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size_t entropy_available = 0;
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# ifdef OPENSSL_RAND_SEED_RDTSC
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entropy_available = ossl_prov_acquire_entropy_from_tsc(pool);
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if (entropy_available > 0)
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return entropy_available;
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# endif
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# ifdef OPENSSL_RAND_SEED_RDCPU
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entropy_available = ossl_prov_acquire_entropy_from_cpu(pool);
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if (entropy_available > 0)
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return entropy_available;
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# endif
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# ifdef USE_BCRYPTGENRANDOM
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bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
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buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
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if (buffer != NULL) {
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size_t bytes = 0;
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if (BCryptGenRandom(NULL, buffer, bytes_needed,
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BCRYPT_USE_SYSTEM_PREFERRED_RNG) == STATUS_SUCCESS)
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bytes = bytes_needed;
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ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
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entropy_available = ossl_rand_pool_entropy_available(pool);
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}
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if (entropy_available > 0)
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return entropy_available;
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# else
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bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
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buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
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if (buffer != NULL) {
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size_t bytes = 0;
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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, bytes_needed, buffer) != 0)
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bytes = bytes_needed;
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CryptReleaseContext(hProvider, 0);
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}
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ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
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entropy_available = ossl_rand_pool_entropy_available(pool);
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}
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if (entropy_available > 0)
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return entropy_available;
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bytes_needed = ossl_rand_pool_bytes_needed(pool, 1 /*entropy_factor*/);
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buffer = ossl_rand_pool_add_begin(pool, bytes_needed);
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if (buffer != NULL) {
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size_t bytes = 0;
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/* poll the Pentium PRG with CryptoAPI */
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if (CryptAcquireContextW(&hProvider, NULL,
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INTEL_DEF_PROV, PROV_INTEL_SEC,
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CRYPT_VERIFYCONTEXT | CRYPT_SILENT) != 0) {
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if (CryptGenRandom(hProvider, bytes_needed, buffer) != 0)
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bytes = bytes_needed;
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CryptReleaseContext(hProvider, 0);
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}
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ossl_rand_pool_add_end(pool, bytes, 8 * bytes);
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entropy_available = ossl_rand_pool_entropy_available(pool);
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}
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if (entropy_available > 0)
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return entropy_available;
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# endif
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return ossl_rand_pool_entropy_available(pool);
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}
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int ossl_pool_add_nonce_data(RAND_POOL *pool)
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{
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struct {
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DWORD pid;
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DWORD tid;
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FILETIME time;
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} data;
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/* Erase the entire structure including any padding */
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memset(&data, 0, sizeof(data));
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/*
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* Add process id, thread id, and a high resolution timestamp to
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* ensure that the nonce is unique with high probability for
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* different process instances.
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*/
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data.pid = GetCurrentProcessId();
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data.tid = GetCurrentThreadId();
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GetSystemTimeAsFileTime(&data.time);
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return ossl_rand_pool_add(pool, (unsigned char *)&data, sizeof(data), 0);
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}
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int ossl_rand_pool_init(void)
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{
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return 1;
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}
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void ossl_rand_pool_cleanup(void)
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{
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}
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void ossl_rand_pool_keep_random_devices_open(int keep)
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{
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}
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#endif
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