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add AES-CCM encrypt 

makes the eShop work
This commit is contained in:
Arisotura 2020-06-21 12:20:02 +02:00
parent e43a216ab5
commit ff69df2a15
1 changed files with 49 additions and 7 deletions
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56
src/DSi_AES.cpp
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@ -165,9 +165,37 @@ void ProcessBlock_CCM_Decrypt()
//printf("AES-CCM: "); _printhex2(data, 16);
Swap16(data_rev, data);
AES_CTR_xcrypt_buffer(&Ctx, data_rev, 16);
for (int i = 0; i < 16; i++) CurMAC[i] ^= data_rev[i];
AES_ECB_encrypt(&Ctx, CurMAC);
Swap16(data, data_rev);
//printf(" -> "); _printhex2(data, 16);
OutputFIFO->Write(*(u32*)&data[0]);
OutputFIFO->Write(*(u32*)&data[4]);
OutputFIFO->Write(*(u32*)&data[8]);
OutputFIFO->Write(*(u32*)&data[12]);
}
void ProcessBlock_CCM_Encrypt()
{
u8 data[16];
u8 data_rev[16];
*(u32*)&data[0] = InputFIFO->Read();
*(u32*)&data[4] = InputFIFO->Read();
*(u32*)&data[8] = InputFIFO->Read();
*(u32*)&data[12] = InputFIFO->Read();
//printf("AES-CCM: "); _printhex2(data, 16);
Swap16(data_rev, data);
for (int i = 0; i < 16; i++) CurMAC[i] ^= data_rev[i];
AES_CTR_xcrypt_buffer(&Ctx, data_rev, 16);
AES_ECB_encrypt(&Ctx, CurMAC);
Swap16(data, data_rev);
@ -232,7 +260,6 @@ void WriteCnt(u32 val)
OutputDMASize = dmasize_out[(val >> 14) & 0x3];
AESMode = (val >> 28) & 0x3;
if (AESMode == 1) printf("AES-CCM TODO\n");
if (val & (1<<24))
{
@ -245,6 +272,8 @@ void WriteCnt(u32 val)
// transfer start (checkme)
RemBlocks = BlkCnt >> 16;
if (AESMode == 0 && (!(val & (1<<20)))) printf("AES: CCM-DECRYPT MAC FROM WRFIFO, TODO\n");
if (RemBlocks > 0)
{
u8 key[16];
@ -365,14 +394,9 @@ void Update()
switch (AESMode)
{
case 0: ProcessBlock_CCM_Decrypt(); break;
case 1: ProcessBlock_CCM_Encrypt(); break;
case 2:
case 3: ProcessBlock_CTR(); break;
default:
// dorp
OutputFIFO->Write(InputFIFO->Read());
OutputFIFO->Write(InputFIFO->Read());
OutputFIFO->Write(InputFIFO->Read());
OutputFIFO->Write(InputFIFO->Read());
}
RemBlocks--;
@ -398,6 +422,24 @@ void Update()
if (CurMAC[15-i] != MAC[i]) Cnt &= ~(1<<21);
}
}
else if (AESMode == 1)
{
Ctx.Iv[13] = 0x00;
Ctx.Iv[14] = 0x00;
Ctx.Iv[15] = 0x00;
AES_CTR_xcrypt_buffer(&Ctx, CurMAC, 16);
u8 finalmac[16];
Swap16(finalmac, CurMAC);
OutputFIFO->Write(*(u32*)&finalmac[0]);
OutputFIFO->Write(*(u32*)&finalmac[4]);
OutputFIFO->Write(*(u32*)&finalmac[8]);
OutputFIFO->Write(*(u32*)&finalmac[12]);
// CHECKME
Cnt &= ~(1<<21);
}
else
{
// CHECKME