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// SPDX-FileCopyrightText: Copyright 2023 yuzu Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <optional>
#include "common/literals.h"
#include "core/file_sys/fssystem/fs_i_storage.h"
#include "core/file_sys/fssystem/fssystem_bucket_tree.h"
namespace FileSys {
using namespace Common::Literals;
class AesCtrCounterExtendedStorage : public IReadOnlyStorage {
YUZU_NON_COPYABLE(AesCtrCounterExtendedStorage);
YUZU_NON_MOVEABLE(AesCtrCounterExtendedStorage);
public:
static constexpr size_t BlockSize = 0x10;
static constexpr size_t KeySize = 0x10;
static constexpr size_t IvSize = 0x10;
static constexpr size_t NodeSize = 16_KiB;
class IDecryptor {
public:
virtual ~IDecryptor() {}
virtual void Decrypt(u8* buf, size_t buf_size, const std::array<u8, KeySize>& key,
const std::array<u8, IvSize>& iv) = 0;
};
struct Entry {
enum class Encryption : u8 {
Encrypted = 0,
NotEncrypted = 1,
};
std::array<u8, sizeof(s64)> offset;
Encryption encryption_value;
std::array<u8, 3> reserved;
s32 generation;
void SetOffset(s64 value) {
std::memcpy(this->offset.data(), std::addressof(value), sizeof(s64));
}
s64 GetOffset() const {
s64 value;
std::memcpy(std::addressof(value), this->offset.data(), sizeof(s64));
return value;
}
};
static_assert(sizeof(Entry) == 0x10);
static_assert(alignof(Entry) == 4);
static_assert(std::is_trivial_v<Entry>);
public:
static constexpr s64 QueryHeaderStorageSize() {
return BucketTree::QueryHeaderStorageSize();
}
static constexpr s64 QueryNodeStorageSize(s32 entry_count) {
return BucketTree::QueryNodeStorageSize(NodeSize, sizeof(Entry), entry_count);
}
static constexpr s64 QueryEntryStorageSize(s32 entry_count) {
return BucketTree::QueryEntryStorageSize(NodeSize, sizeof(Entry), entry_count);
}
static Result CreateSoftwareDecryptor(std::unique_ptr<IDecryptor>* out);
private:
mutable BucketTree m_table;
VirtualFile m_data_storage;
std::array<u8, KeySize> m_key;
u32 m_secure_value;
s64 m_counter_offset;
std::unique_ptr<IDecryptor> m_decryptor;
public:
AesCtrCounterExtendedStorage()
: m_table(), m_data_storage(), m_secure_value(), m_counter_offset(), m_decryptor() {}
virtual ~AesCtrCounterExtendedStorage() {
this->Finalize();
}
Result Initialize(const void* key, size_t key_size, u32 secure_value, s64 counter_offset,
VirtualFile data_storage, VirtualFile node_storage, VirtualFile entry_storage,
s32 entry_count, std::unique_ptr<IDecryptor>&& decryptor);
void Finalize();
bool IsInitialized() const {
return m_table.IsInitialized();
}
virtual size_t Read(u8* buffer, size_t size, size_t offset) const override;
virtual size_t GetSize() const override {
BucketTree::Offsets offsets;
ASSERT(R_SUCCEEDED(m_table.GetOffsets(std::addressof(offsets))));
return offsets.end_offset;
}
Result GetEntryList(Entry* out_entries, s32* out_entry_count, s32 entry_count, s64 offset,
s64 size);
private:
Result Initialize(const void* key, size_t key_size, u32 secure_value, VirtualFile data_storage,
VirtualFile table_storage);
};
} // namespace FileSys
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