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36 lines
909 B
C++
36 lines
909 B
C++
// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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#pragma once
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#include <array>
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#include "core/crypto/aes_util.h"
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#include "core/crypto/encryption_layer.h"
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#include "core/crypto/key_manager.h"
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namespace Core::Crypto {
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// Sits on top of a VirtualFile and provides CTR-mode AES description.
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class CTREncryptionLayer : public EncryptionLayer {
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public:
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using IVData = std::array<u8, 16>;
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CTREncryptionLayer(FileSys::VirtualFile base_, Key128 key_, std::size_t base_offset_);
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std::size_t Read(u8* data, std::size_t length, std::size_t offset) const override;
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void SetIV(const IVData& iv);
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private:
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std::size_t base_offset;
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// Must be mutable as operations modify cipher contexts.
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mutable AESCipher<Key128> cipher;
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mutable IVData iv{};
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void UpdateIV(std::size_t offset) const;
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};
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} // namespace Core::Crypto
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