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