mirror of
https://github.com/Atmosphere-NX/Atmosphere
synced 2024-11-16 01:49:32 +00:00
138 lines
4.7 KiB
C++
138 lines
4.7 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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#pragma once
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#include <stratosphere.hpp>
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namespace ams::spl::impl {
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class AesKeySlotCacheEntry : public util::IntrusiveListBaseNode<AesKeySlotCacheEntry> {
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NON_COPYABLE(AesKeySlotCacheEntry);
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NON_MOVEABLE(AesKeySlotCacheEntry);
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private:
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friend class AesKeySlotCache;
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public:
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static constexpr size_t KeySize = crypto::AesDecryptor128::KeySize;
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private:
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const s32 m_aes_keyslot_index;
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s32 m_virtual_aes_keyslot;
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public:
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explicit AesKeySlotCacheEntry(s32 idx) : m_aes_keyslot_index(idx), m_virtual_aes_keyslot(-1) { /* ... */ }
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bool Contains(s32 virtual_slot) const {
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return virtual_slot == m_virtual_aes_keyslot;
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}
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s32 GetPhysicalAesKeySlotIndex() const { return m_aes_keyslot_index; }
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s32 GetVirtualAesKeySlotIndex() const { return m_virtual_aes_keyslot; }
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void SetVirtualAesKeySlot(s32 virtual_slot) {
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m_virtual_aes_keyslot = virtual_slot;
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}
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void ClearVirtualAesKeySlot() {
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m_virtual_aes_keyslot = -1;
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}
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};
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class AesKeySlotCache {
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NON_COPYABLE(AesKeySlotCache);
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NON_MOVEABLE(AesKeySlotCache);
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private:
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using AesKeySlotCacheEntryList = util::IntrusiveListBaseTraits<AesKeySlotCacheEntry>::ListType;
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private:
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AesKeySlotCacheEntryList m_mru_list;
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public:
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constexpr AesKeySlotCache() : m_mru_list() { /* ... */ }
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s32 Allocate(s32 virtual_slot) {
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return this->AllocateFromLru(virtual_slot);
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}
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bool Find(s32 *out, s32 virtual_slot) {
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for (auto it = m_mru_list.begin(); it != m_mru_list.end(); ++it) {
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if (it->Contains(virtual_slot)) {
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*out = it->GetPhysicalAesKeySlotIndex();
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this->UpdateMru(it);
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return true;
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}
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}
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return false;
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}
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bool Release(s32 *out, s32 virtual_slot) {
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for (auto it = m_mru_list.begin(); it != m_mru_list.end(); ++it) {
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if (it->Contains(virtual_slot)) {
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*out = it->GetPhysicalAesKeySlotIndex();
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it->ClearVirtualAesKeySlot();
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this->UpdateLru(it);
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return true;
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}
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}
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return false;
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}
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bool FindPhysical(s32 physical_slot) {
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for (auto it = m_mru_list.begin(); it != m_mru_list.end(); ++it) {
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if (it->GetPhysicalAesKeySlotIndex() == physical_slot) {
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this->UpdateMru(it);
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if (it->GetVirtualAesKeySlotIndex() == physical_slot) {
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return true;
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} else {
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it->SetVirtualAesKeySlot(physical_slot);
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return false;
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}
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}
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}
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AMS_ABORT();
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}
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void AddEntry(AesKeySlotCacheEntry *entry) {
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m_mru_list.push_front(*entry);
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}
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private:
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s32 AllocateFromLru(s32 virtual_slot) {
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AMS_ASSERT(!m_mru_list.empty());
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auto it = m_mru_list.rbegin();
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it->SetVirtualAesKeySlot(virtual_slot);
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auto *entry = std::addressof(*it);
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m_mru_list.pop_back();
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m_mru_list.push_front(*entry);
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return entry->GetPhysicalAesKeySlotIndex();
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}
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void UpdateMru(AesKeySlotCacheEntryList::iterator it) {
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auto *entry = std::addressof(*it);
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m_mru_list.erase(it);
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m_mru_list.push_front(*entry);
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}
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void UpdateLru(AesKeySlotCacheEntryList::iterator it) {
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auto *entry = std::addressof(*it);
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m_mru_list.erase(it);
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m_mru_list.push_back(*entry);
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}
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};
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}
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