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Fix detection of native NDS ARM BIOS images (#1910)

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* Fix detection of native NDS ARM BIOS images

- Instead of checking for built-in BIOS images, now the altered methods check for native ones
- The CRC32 must match exactly; patched BIOS images will result in `false`

* Encapsulate `NDS::ARM9BIOS` and `ARM7BIOS`

- Also compute the checksum only when setting the BIOS
This commit is contained in:
Jesse Talavera
2023-12-15 08:54:41 -05:00
committed by GitHub
parent c867a7f1c0
commit 24c402af51
6 changed files with 49 additions and 15 deletions
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12
src/NDSCart.cpp
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@ -111,7 +111,7 @@ void NDSCartSlot::Key1_ApplyKeycode(u32* keycode, u32 mod) noexcept
void NDSCartSlot::Key1_LoadKeyBuf(bool dsi, const u8 *bios, u32 biosLength) noexcept
{
if (!NDS.IsLoadedARM7BIOSBuiltIn())
if (NDS.IsLoadedARM7BIOSKnownNative())
{
u32 expected_bios_length = dsi ? 0x10000 : 0x4000;
if (biosLength != expected_bios_length)
@ -261,7 +261,7 @@ int CartCommon::ROMCommandStart(NDS& nds, NDSCartSlot& cartslot, const u8* cmd,
case 0x3C:
CmdEncMode = 1;
cartslot.Key1_InitKeycode(false, *(u32*)&ROM[0xC], 2, 2, &nds.ARM7BIOS[0], sizeof(NDS::ARM7BIOS));
cartslot.Key1_InitKeycode(false, *(u32*)&ROM[0xC], 2, 2, nds.GetARM7BIOS().data(), ARM7BIOSSize);
DSiMode = false;
return 0;
@ -1540,10 +1540,10 @@ void NDSCartSlot::DecryptSecureArea(u8* out) noexcept
memcpy(out, &cartrom[arm9base], 0x800);
Key1_InitKeycode(false, gamecode, 2, 2, &NDS.ARM7BIOS[0], sizeof(NDS::ARM7BIOS));
Key1_InitKeycode(false, gamecode, 2, 2, NDS.GetARM7BIOS().data(), ARM7BIOSSize);
Key1_Decrypt((u32*)&out[0]);
Key1_InitKeycode(false, gamecode, 3, 2, &NDS.ARM7BIOS[0], sizeof(NDS::ARM7BIOS));
Key1_InitKeycode(false, gamecode, 3, 2, NDS.GetARM7BIOS().data(), ARM7BIOSSize);
for (u32 i = 0; i < 0x800; i += 8)
Key1_Decrypt((u32*)&out[i]);
@ -1695,11 +1695,11 @@ void NDSCartSlot::SetCart(std::unique_ptr<CartCommon>&& cart) noexcept
strncpy((char*)&cartrom[header.ARM9ROMOffset], "encryObj", 8);
Key1_InitKeycode(false, romparams.GameCode, 3, 2, &NDS.ARM7BIOS[0], sizeof(NDS::ARM7BIOS));
Key1_InitKeycode(false, romparams.GameCode, 3, 2, NDS.GetARM7BIOS().data(), ARM7BIOSSize);
for (u32 i = 0; i < 0x800; i += 8)
Key1_Encrypt((u32*)&cartrom[header.ARM9ROMOffset + i]);
Key1_InitKeycode(false, romparams.GameCode, 2, 2, &NDS.ARM7BIOS[0], sizeof(NDS::ARM7BIOS));
Key1_InitKeycode(false, romparams.GameCode, 2, 2, NDS.GetARM7BIOS().data(), ARM7BIOSSize);
Key1_Encrypt((u32*)&cartrom[header.ARM9ROMOffset]);
Log(LogLevel::Debug, "Re-encrypted cart secure area\n");