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properly handle ROMs with encrypted secure area

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This commit is contained in:
Arisotura
2020-03-30 11:04:50 +02:00
parent 5f99a68151
commit 104b2a03aa
3 changed files with 68 additions and 22 deletions
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70
src/NDSCart.cpp
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@ -865,6 +865,35 @@ bool ReadROMParams(u32 gamecode, u32* params)
}
void DecryptSecureArea(u8* out)
{
u32 gamecode = *(u32*)&CartROM[0x0C];
u32 arm9base = *(u32*)&CartROM[0x20];
memcpy(out, &CartROM[arm9base], 0x800);
Key1_InitKeycode(gamecode, 2, 2);
Key1_Decrypt((u32*)&out[0]);
Key1_InitKeycode(gamecode, 3, 2);
for (u32 i = 0; i < 0x800; i += 8)
Key1_Decrypt((u32*)&out[i]);
if (!strncasecmp((const char*)out, "encryObj", 8))
{
printf("Secure area decryption OK\n");
*(u32*)&out[0] = 0xE7FFDEFF;
*(u32*)&out[4] = 0xE7FFDEFF;
}
else
{
printf("Secure area decryption failed\n");
for (u32 i = 0; i < 0x800; i += 4)
*(u32*)&out[i] = 0xE7FFDEFF;
}
}
bool LoadROM(const char* path, const char* sram, bool direct)
{
// TODO: streaming mode? for really big ROMs or systems with limited RAM
@ -933,28 +962,8 @@ bool LoadROM(const char* path, const char* sram, bool direct)
printf("Cart ID: %08X\n", CartID);
if (*(u32*)&CartROM[0x20] < 0x4000)
{
//ApplyDLDIPatch();
}
if (direct)
{
// TODO: in the case of an already-encrypted secure area, direct boot
// needs it decrypted
NDS::SetupDirectBoot();
CmdEncMode = 2;
}
CartInserted = true;
// TODO: support more fancy cart types (homebrew?, flashcarts, etc)
if (CartID & 0x08000000)
ROMCommandHandler = ROMCommand_RetailNAND;
else
ROMCommandHandler = ROMCommand_Retail;
u32 arm9base = *(u32*)&CartROM[0x20];
if (arm9base < 0x8000)
{
if (arm9base >= 0x4000)
@ -975,9 +984,28 @@ bool LoadROM(const char* path, const char* sram, bool direct)
}
}
else
{
CartIsHomebrew = true;
//ApplyDLDIPatch();
}
}
if (direct)
{
// TODO: in the case of an already-encrypted secure area, direct boot
// needs it decrypted
NDS::SetupDirectBoot();
CmdEncMode = 2;
}
CartInserted = true;
// TODO: support more fancy cart types (homebrew?, flashcarts, etc)
if (CartID & 0x08000000)
ROMCommandHandler = ROMCommand_RetailNAND;
else
ROMCommandHandler = ROMCommand_Retail;
// encryption
Key1_InitKeycode(gamecode, 2, 2);