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/* Copyright (c) 2014, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <CCryptoBoringSSL_rand.h>
#include "../fipsmodule/rand/internal.h"
#if defined(OPENSSL_RAND_WINDOWS)
#include <limits.h>
#include <stdlib.h>
OPENSSL_MSVC_PRAGMA(warning(push, 3))
#include <windows.h>
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
#include <bcrypt.h>
OPENSSL_MSVC_PRAGMA(comment(lib, "bcrypt.lib"))
#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
OPENSSL_MSVC_PRAGMA(warning(pop))
#if WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_APP) && \
!WINAPI_FAMILY_PARTITION(WINAPI_PARTITION_DESKTOP)
void CRYPTO_init_sysrand(void) {}
void CRYPTO_sysrand(uint8_t *out, size_t requested) {
while (requested > 0) {
ULONG output_bytes_this_pass = ULONG_MAX;
if (requested < output_bytes_this_pass) {
output_bytes_this_pass = (ULONG)requested;
}
if (!BCRYPT_SUCCESS(BCryptGenRandom(
/*hAlgorithm=*/NULL, out, output_bytes_this_pass,
BCRYPT_USE_SYSTEM_PREFERRED_RNG))) {
abort();
}
requested -= output_bytes_this_pass;
out += output_bytes_this_pass;
}
}
#else
// See: https://learn.microsoft.com/en-us/windows/win32/seccng/processprng
typedef BOOL (WINAPI *ProcessPrngFunction)(PBYTE pbData, SIZE_T cbData);
static ProcessPrngFunction g_processprng_fn = NULL;
static void init_processprng(void) {
HMODULE hmod = LoadLibraryW(L"bcryptprimitives");
if (hmod == NULL) {
abort();
}
g_processprng_fn = (ProcessPrngFunction)GetProcAddress(hmod, "ProcessPrng");
if (g_processprng_fn == NULL) {
abort();
}
}
void CRYPTO_init_sysrand(void) {
static CRYPTO_once_t once = CRYPTO_ONCE_INIT;
CRYPTO_once(&once, init_processprng);
}
void CRYPTO_sysrand(uint8_t *out, size_t requested) {
CRYPTO_init_sysrand();
// On non-UWP configurations, use ProcessPrng instead of BCryptGenRandom
// to avoid accessing resources that may be unavailable inside the
// Chromium sandbox. See https://crbug.com/74242
if (!g_processprng_fn(out, requested)) {
abort();
}
}
#endif // WINAPI_PARTITION_APP && !WINAPI_PARTITION_DESKTOP
void CRYPTO_sysrand_for_seed(uint8_t *out, size_t requested) {
CRYPTO_sysrand(out, requested);
}
#endif // OPENSSL_RAND_WINDOWS
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