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// Copyright 2018 yuzu emulator team
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include "core/crypto/aes_util.h"
#include "core/crypto/encryption_layer.h"
#include "core/crypto/key_manager.h"
namespace Core::Crypto {
// Sits on top of a VirtualFile and provides CTR-mode AES decription.
class CTREncryptionLayer : public EncryptionLayer {
public:
using IVData = std::array<u8, 16>;
CTREncryptionLayer(FileSys::VirtualFile base_, Key128 key_, std::size_t base_offset_);
std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
void SetIV(const IVData& iv);
private:
std::size_t base_offset;
// Must be mutable as operations modify cipher contexts.
mutable AESCipher<Key128> cipher;
mutable IVData iv{};
void UpdateIV(std::size_t offset) const;
};
} // namespace Core::Crypto
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