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// Copyright 2017 Dolphin Emulator Project
// SPDX-License-Identifier: GPL-2.0-or-later
#pragma once
#include <memory>
#include "Common/CommonTypes.h"
// Dolphin only uses/implements AES-128-CBC.
namespace Common::AES
{
enum class Mode
{
Decrypt,
Encrypt,
};
class Context
{
protected:
static constexpr size_t Nk = 4;
static constexpr size_t Nb = 4;
static constexpr size_t Nr = 10;
static constexpr size_t WORD_SIZE = sizeof(u32);
static constexpr size_t NUM_ROUND_KEYS = Nr + 1;
public:
static constexpr size_t KEY_SIZE = Nk * WORD_SIZE;
static constexpr size_t BLOCK_SIZE = Nb * WORD_SIZE;
Context() = default;
virtual ~Context() = default;
virtual bool Crypt(const u8* iv, u8* iv_out, const u8* buf_in, u8* buf_out, size_t len) const = 0;
bool Crypt(const u8* iv, const u8* buf_in, u8* buf_out, size_t len) const
{
return Crypt(iv, nullptr, buf_in, buf_out, len);
}
bool CryptIvZero(const u8* buf_in, u8* buf_out, size_t len) const
{
return Crypt(nullptr, nullptr, buf_in, buf_out, len);
}
};
std::unique_ptr<Context> CreateContextEncrypt(const u8* key);
std::unique_ptr<Context> CreateContextDecrypt(const u8* key);
// OFB decryption for WiiConnect24
void CryptOFB(const u8* key, const u8* iv, u8* iv_out, const u8* buf_in, u8* buf_out, size_t size);
} // namespace Common::AES
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