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melonDS
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here, have ES encryption too

This commit is contained in:
Arisotura 2021-08-14 01:13:07 +02:00
parent 3aea9b5eb7
commit 3272a3a399
1 changed files with 98 additions and 23 deletions
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121
src/DSi_NAND.cpp
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@ -175,6 +175,93 @@ UINT FF_WriteNAND(BYTE* buf, LBA_t sector, UINT num)
}
bool ESEncrypt(u8* data, u32 len)
{
AES_ctx ctx;
u8 iv[16];
u8 mac[16];
iv[0] = 0x02;
for (int i = 0; i < 12; i++) iv[1+i] = data[len+0x1C-i];
iv[13] = 0x00;
iv[14] = 0x00;
iv[15] = 0x01;
AES_init_ctx_iv(&ctx, ESKey, iv);
u32 blklen = (len + 0xF) & ~0xF;
mac[0] = 0x3A;
for (int i = 1; i < 13; i++) mac[i] = iv[i];
mac[13] = (blklen >> 16) & 0xFF;
mac[14] = (blklen >> 8) & 0xFF;
mac[15] = blklen & 0xFF;
AES_ECB_encrypt(&ctx, mac);
u32 coarselen = len & ~0xF;
for (u32 i = 0; i < coarselen; i += 16)
{
u8 tmp[16];
DSi_AES::Swap16(tmp, &data[i]);
for (int i = 0; i < 16; i++) mac[i] ^= tmp[i];
AES_CTR_xcrypt_buffer(&ctx, tmp, 16);
AES_ECB_encrypt(&ctx, mac);
DSi_AES::Swap16(&data[i], tmp);
}
u32 remlen = len - coarselen;
if (remlen)
{
u8 rem[16];
memset(rem, 0, 16);
for (int i = 0; i < remlen; i++)
rem[15-i] = data[coarselen+i];
for (int i = 0; i < 16; i++) mac[i] ^= rem[i];
AES_CTR_xcrypt_buffer(&ctx, rem, 16);
AES_ECB_encrypt(&ctx, mac);
for (int i = 0; i < remlen; i++)
data[coarselen+i] = rem[15-i];
}
ctx.Iv[13] = 0x00;
ctx.Iv[14] = 0x00;
ctx.Iv[15] = 0x00;
AES_CTR_xcrypt_buffer(&ctx, mac, 16);
for (int i = 0; i < 16; i++)
data[len+i] = mac[15-i];
u8 footer[16];
iv[0] = 0x00;
iv[1] = 0x00;
iv[2] = 0x00;
for (int i = 0; i < 12; i++) iv[3+i] = data[len+0x1C-i];
iv[15] = 0x00;
footer[15] = 0x3A;
footer[2] = (len >> 16) & 0xFF;
footer[1] = (len >> 8) & 0xFF;
footer[0] = len & 0xFF;
AES_ctx_set_iv(&ctx, iv);
AES_CTR_xcrypt_buffer(&ctx, footer, 16);
data[len+0x10] = footer[15];
data[len+0x1D] = footer[2];
data[len+0x1E] = footer[1];
data[len+0x1F] = footer[0];
return true;
}
bool ESDecrypt(u8* data, u32 len)
{
AES_ctx ctx;
@ -189,7 +276,7 @@ bool ESDecrypt(u8* data, u32 len)
AES_init_ctx_iv(&ctx, ESKey, iv);
u32 blklen = (len + 0xF) & ~0xF; printf("blk=%x\n", blklen);
u32 blklen = (len + 0xF) & ~0xF;
mac[0] = 0x3A;
for (int i = 1; i < 13; i++) mac[i] = iv[i];
mac[13] = (blklen >> 16) & 0xFF;
@ -405,31 +492,19 @@ void ImportTest()
f_close(&ticketfile);
// DECRYPT!!
/*{
u8 iv[16];
FILE* dorp = fopen("assticket1.bin", "wb");
fwrite(ticket, 708, 1, dorp);
fclose(dorp);
iv[0] = 0x02;
for (int i = 0; i < 12; i++) iv[1+i] = ticket[0x2A4 + 0x1C - i];
iv[13] = 0x00;
iv[14] = 0x00;
iv[15] = 0x01;
AES_ctx aes;
AES_init_ctx_iv(&aes, ESKey, iv);
for (u32 i = 0; i < 0x290; i += 16)
{
u8 tmp[16];
DSi_AES::Swap16(tmp, &ticket[i]);
AES_CTR_xcrypt_buffer(&aes, tmp, 16);
DSi_AES::Swap16(&ticket[i], tmp);
}
}*/
ESDecrypt(ticket, 0x2A4);
FILE* dorp = fopen("assticket.bin", "wb");
dorp = fopen("assticket2.bin", "wb");
fwrite(ticket, 708, 1, dorp);
fclose(dorp);
ESEncrypt(ticket, 0x2A4);
dorp = fopen("assticket3.bin", "wb");
fwrite(ticket, 708, 1, dorp);
fclose(dorp);
}