84 lines
2.4 KiB
C
84 lines
2.4 KiB
C
// Copyright (c) 2014, Google Inc.
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// SPDX-License-Identifier: ISC
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#include <openssl/rand.h>
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#include "internal.h"
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#include "../internal.h"
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#if defined(OPENSSL_RAND_WINDOWS)
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#include <limits.h>
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#include <stdlib.h>
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OPENSSL_MSVC_PRAGMA(warning(push, 3))
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#include <windows.h>
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// ProcessPrng (from `bcryptprimitives.dll`) is only available on Windows 8+.
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#if !defined(__MINGW32__) && defined(_WIN32_WINNT) && _WIN32_WINNT <= _WIN32_WINNT_WIN7
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#define AWSLC_WINDOWS_7_COMPAT
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#endif
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#if defined(AWSLC_WINDOWS_7_COMPAT) || \
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(WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
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!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP))
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#include <bcrypt.h>
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OPENSSL_MSVC_PRAGMA(comment(lib, "bcrypt.lib"))
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#endif // AWSLC_WINDOWS_7_COMPAT || (WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP)
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OPENSSL_MSVC_PRAGMA(warning(pop))
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#if defined(AWSLC_WINDOWS_7_COMPAT) || \
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(WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
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!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP))
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void CRYPTO_sysrand(uint8_t *out, size_t requested) {
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while (requested > 0) {
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ULONG output_bytes_this_pass = ULONG_MAX;
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if (requested < output_bytes_this_pass) {
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output_bytes_this_pass = (ULONG)requested;
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}
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if (!BCRYPT_SUCCESS(BCryptGenRandom(
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/*hAlgorithm=*/NULL, out, output_bytes_this_pass,
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BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
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abort();
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}
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requested -= output_bytes_this_pass;
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out += output_bytes_this_pass;
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}
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}
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#else
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// See: https://learn.microsoft.com/en-us/windows/win32/seccng/processprng
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typedef BOOL (WINAPI *ProcessPrngFunction)(PBYTE pbData, SIZE_T cbData);
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static ProcessPrngFunction g_processprng_fn = NULL;
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static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
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static void init_processprng(void) {
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HMODULE hmod = LoadLibraryW(L"bcryptprimitives");
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if (hmod == NULL) {
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abort();
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}
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g_processprng_fn = (ProcessPrngFunction)(void(*)(void))GetProcAddress(hmod, "ProcessPrng");
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if (g_processprng_fn == NULL) {
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abort();
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}
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}
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void CRYPTO_sysrand(uint8_t *out, size_t requested) {
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CRYPTO_once(&once, init_processprng);
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// On non-UWP configurations, use ProcessPrng instead of BCryptGenRandom
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// to avoid accessing resources that may be unavailable inside the
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// Chromium sandbox. See https://crbug.com/74242
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if (!g_processprng_fn(out, requested)) {
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abort();
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}
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}
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#endif // AWSLC_WINDOWS_7_COMPAT || (WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP)
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#endif // OPENSSL_RAND_WINDOWS
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