Atmosphere/libraries/libstratosphere/source/os/impl/os_random_impl.os.horizon.cpp

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/*
* Copyright (c) Atmosphère-NX
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*
* 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>
namespace ams::os::impl {
void InitializeRandomImpl(util::TinyMT *mt) {
/* Retrieve entropy from kernel. */
u32 seed[4];
static_assert(util::size(seed) == util::TinyMT::NumStateWords);
/* Nintendo does not check the result of these invocations, but we will for safety. */
/* Nintendo uses entropy values 0, 1 to seed the public TinyMT random, and values */
/* 2, 3 to seed os::detail::RngManager's private TinyMT random. */
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R_ABORT_UNLESS(svc::GetInfo(reinterpret_cast<u64 *>(seed + 0), svc::InfoType_RandomEntropy, svc::InvalidHandle, 0));
R_ABORT_UNLESS(svc::GetInfo(reinterpret_cast<u64 *>(seed + 2), svc::InfoType_RandomEntropy, svc::InvalidHandle, 1));
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mt->Initialize(seed, util::size(seed));
}
}