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/*
Copyright 2016-2023 melonDS team
This file is part of melonDS.
melonDS is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation, either version 3 of the License, or (at your option)
any later version.
melonDS is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with melonDS. If not, see http://www.gnu.org/licenses/.
*/
#ifndef DSI_AES_H
#define DSI_AES_H
#include "types.h"
#include "Savestate.h"
#include "FIFO.h"
#include "tiny-AES-c/aes.hpp"
namespace melonDS
{
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wattributes"
#if defined(__GNUC__) && (__GNUC__ >= 11) // gcc 11.*
// NOTE: Yes, the compiler does *not* recognize this code pattern, so it is indeed an optimization.
__attribute((always_inline)) static void Bswap128(void* Dst, const void* Src)
{
*(__int128*)Dst = __builtin_bswap128(*(__int128*)Src);
}
#else
__attribute((always_inline)) static void Bswap128(void* Dst, const void* Src)
{
for (int i = 0; i < 16; ++i)
{
((u8*)Dst)[i] = ((u8*)Src)[15 - i];
}
}
#endif
#pragma GCC diagnostic pop
class DSi;
class DSi_AES
{
public:
DSi_AES(melonDS::DSi& dsi);
~DSi_AES();
void Reset();
void DoSavestate(Savestate* file);
u32 ReadCnt();
void WriteCnt(u32 val);
void WriteBlkCnt(u32 val);
u32 ReadOutputFIFO();
void WriteInputFIFO(u32 val);
void CheckInputDMA();
void CheckOutputDMA();
void Update();
void WriteIV(u32 offset, u32 val, u32 mask);
void WriteMAC(u32 offset, u32 val, u32 mask);
void WriteKeyNormal(u32 slot, u32 offset, u32 val, u32 mask);
void WriteKeyX(u32 slot, u32 offset, u32 val, u32 mask);
void WriteKeyY(u32 slot, u32 offset, u32 val, u32 mask);
static void ROL16(u8* val, u32 n);
static void DeriveNormalKey(u8* keyX, u8* keyY, u8* normalkey);
private:
melonDS::DSi& DSi;
u32 Cnt;
u32 BlkCnt;
u32 RemExtra;
u32 RemBlocks;
bool OutputFlush;
u32 InputDMASize, OutputDMASize;
u32 AESMode;
FIFO<u32, 16> InputFIFO;
FIFO<u32, 16> OutputFIFO;
u8 IV[16];
u8 MAC[16];
u8 KeyNormal[4][16];
u8 KeyX[4][16];
u8 KeyY[4][16];
u8 CurKey[16];
u8 CurMAC[16];
// output MAC for CCM encrypt
u8 OutputMAC[16];
bool OutputMACDue;
AES_ctx Ctx;
void ProcessBlock_CCM_Extra();
void ProcessBlock_CCM_Decrypt();
void ProcessBlock_CCM_Encrypt();
void ProcessBlock_CTR();
};
}
#endif // DSI_AES_H
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