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https://github.com/Atmosphere-NX/Atmosphere.git
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81f91803ec
* fs: implement support for interacting with ncas. * spl: extend to use virtual keyslots
138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
/*
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* Copyright (c) 2018-2020 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 {
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class KeySlotCacheEntry : public util::IntrusiveListBaseNode<KeySlotCacheEntry> {
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NON_COPYABLE(KeySlotCacheEntry);
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NON_MOVEABLE(KeySlotCacheEntry);
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private:
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friend class KeySlotCache;
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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 slot_index;
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s32 virtual_slot;
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public:
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explicit KeySlotCacheEntry(s32 idx) : slot_index(idx), virtual_slot(-1) { /* ... */ }
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bool Contains(s32 virtual_slot) const {
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return virtual_slot == this->virtual_slot;
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}
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s32 GetPhysicalKeySlotIndex() const { return this->slot_index; }
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s32 GetVirtualKeySlotIndex() const { return this->virtual_slot; }
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void SetVirtualSlot(s32 virtual_slot) {
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this->virtual_slot = virtual_slot;
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}
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void ClearVirtualSlot() {
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this->virtual_slot = -1;
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}
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};
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class KeySlotCache {
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NON_COPYABLE(KeySlotCache);
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NON_MOVEABLE(KeySlotCache);
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private:
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using KeySlotCacheEntryList = util::IntrusiveListBaseTraits<KeySlotCacheEntry>::ListType;
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private:
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KeySlotCacheEntryList mru_list;
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public:
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constexpr KeySlotCache() : 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 = this->mru_list.begin(); it != this->mru_list.end(); ++it) {
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if (it->Contains(virtual_slot)) {
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*out = it->GetPhysicalKeySlotIndex();
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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 = this->mru_list.begin(); it != this->mru_list.end(); ++it) {
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if (it->Contains(virtual_slot)) {
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*out = it->GetPhysicalKeySlotIndex();
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it->ClearVirtualSlot();
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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 = this->mru_list.begin(); it != this->mru_list.end(); ++it) {
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if (it->GetPhysicalKeySlotIndex() == physical_slot) {
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this->UpdateMru(it);
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if (it->GetVirtualKeySlotIndex() == physical_slot) {
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return true;
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} else {
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it->SetVirtualSlot(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(KeySlotCacheEntry *entry) {
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this->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(!this->mru_list.empty());
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auto it = this->mru_list.rbegin();
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it->SetVirtualSlot(virtual_slot);
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auto *entry = std::addressof(*it);
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this->mru_list.pop_back();
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this->mru_list.push_front(*entry);
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return entry->GetPhysicalKeySlotIndex();
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}
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void UpdateMru(KeySlotCacheEntryList::iterator it) {
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auto *entry = std::addressof(*it);
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this->mru_list.erase(it);
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this->mru_list.push_front(*entry);
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}
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void UpdateLru(KeySlotCacheEntryList::iterator it) {
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auto *entry = std::addressof(*it);
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this->mru_list.erase(it);
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this->mru_list.push_back(*entry);
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}
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};
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}
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