mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-09-20 07:08:59 +00:00
60 lines
1.9 KiB
C++
60 lines
1.9 KiB
C++
/*
|
|
* Copyright (c) Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <stratosphere.hpp>
|
|
#include "../spl/impl/spl_ctr_drbg.hpp"
|
|
#include <sys/random.h>
|
|
|
|
namespace ams::crypto {
|
|
|
|
namespace {
|
|
|
|
using Drbg = ::ams::spl::impl::CtrDrbg<crypto::AesEncryptor128, crypto::AesEncryptor128::KeySize, false>;
|
|
|
|
constinit util::TypedStorage<Drbg> g_drbg = {};
|
|
|
|
bool InitializeCsrng() {
|
|
u8 seed[Drbg::SeedSize];
|
|
AMS_ABORT_UNLESS(::getentropy(seed, sizeof(seed)) == 0);
|
|
|
|
util::ConstructAt(g_drbg);
|
|
util::GetReference(g_drbg).Initialize(seed, sizeof(seed), nullptr, 0, nullptr, 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
}
|
|
|
|
void GenerateCryptographicallyRandomBytes(void *dst, size_t dst_size) {
|
|
AMS_FUNCTION_LOCAL_STATIC(bool, s_initialized, InitializeCsrng());
|
|
AMS_ABORT_UNLESS(s_initialized);
|
|
|
|
AMS_ASSERT(dst_size <= Drbg::RequestSizeMax);
|
|
|
|
if (!util::GetReference(g_drbg).Generate(dst, dst_size, nullptr, 0)) {
|
|
/* Reseed, if needed. */
|
|
{
|
|
u8 seed[Drbg::SeedSize];
|
|
AMS_ABORT_UNLESS(::getentropy(seed, sizeof(seed)) == 0);
|
|
|
|
util::GetReference(g_drbg).Reseed(seed, sizeof(seed), nullptr, 0);
|
|
}
|
|
|
|
util::GetReference(g_drbg).Generate(dst, dst_size, nullptr, 0);
|
|
}
|
|
}
|
|
|
|
}
|