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Add dev DSi blowfish key support to dump dev software #969

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5f3df51
Add dev DSi blowfish key support to dump dev roms
xp0x00 Jun 22, 2026
12c8ef1
Mention dev DSi blowfish support file in readme
xp0x00 Jun 22, 2026
42882d2
Adjust dsi dev app check
xp0x00 Jun 23, 2026
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1 change: 1 addition & 0 deletions README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -64,6 +64,7 @@ For certain functionality, GodMode9 may need 'support files'. Support files shou
* __`aeskeydb.bin`__: This should contain 0x25keyX, 0x18keyX and 0x1BkeyX to enable decryption of 7x / Secure3 / Secure4 encrypted NCCH files, 0x11key95 / 0x11key96 for FIRM decrypt support and 0x11keyOTP / 0x11keyIVOTP for 'secret' sector 0x96 crypto support. Entrypoints other than [boot9strap](https://github.com/SciresM/boot9strap) or [fastboot3ds](https://github.com/derrekr/fastboot3DS) may require a aeskeydb.bin file. This is now included in standard releases of GM9. No need to hunt down the file!
* __`seeddb.bin`__: This file is optional and required to decrypt and mount seed-encrypted NCCHs and CIAs (if the seed in question is not installed to your NAND). Note that your seeddb.bin must also contain the seed for the specific game you need to decrypt.
* __`encTitleKeys.bin`__ / __`decTitleKeys.bin`__: These files are optional and provide titlekeys, which are required to decrypt and install contents downloaded from CDN (for DSi and 3DS content).
* __`TwlBlowfishKeyDev.bin`__: This should contain the dev DSi blowfish key. It is optional and required to dump DSi developer or factory cartridges with dev software flashed on them.

### Fonts and translations
GodMode9 also supports custom fonts and translations as support files. These both use custom formats, fonts use FRF (Font RIFF) files which can be created using the `fontriff.py` Python script in the 'utils' folder. Translations use TRF (Translation RIFF) files from the `transriff.py` script. Examples of the inputs to these scripts can be found in the 'fonts' and 'languages' folders of the 'resources' folder respectively.
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24 changes: 22 additions & 2 deletions arm9/source/gamecart/secure_ntr.c
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Expand Up @@ -23,6 +23,7 @@
#include "card_ntr.h"
// #include "draw.h"
#include "timer.h"
#include "support.h"


#define BSWAP32(val) ((((val >> 24) & 0xFF)) | (((val >> 16) & 0xFF) << 8) | (((val >> 8) & 0xFF) << 16) | ((val & 0xFF) << 24))
Expand Down Expand Up @@ -119,7 +120,15 @@ void NTR_ApplyKey (u32* pCardHash, int nCardHash, u32* pKeyCode)

void NTR_InitKey (u32 aGameCode, u32* pCardHash, int nCardHash, u32* pKeyCode, int level, int iCardDevice)
{
if(iCardDevice)
if(iCardDevice == 2)
{
size_t len = LoadSupportFile(BLOWFISHKEYDEV_NAME, pCardHash, 0x1048);

@d0k3 d0k3 Jul 5, 2026

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len is set, but unused after. Did you mean to check for 0x1048? I think you should. Even if you checked the availaibility of the support file before this, something may happen in between.

pKeyCode[0] = 0;
pKeyCode[1] = 0;

@d0k3 d0k3 Jul 5, 2026

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This and below: don't mix tabs and spaces. Everything else here uses spaces.

pKeyCode[2] = 0;
return;
}
else if(iCardDevice == 1)
{
const u8* BlowfishTwl = (const u8*)0x01FFD3E0;
memcpy (pCardHash, BlowfishTwl, 0x1048);
Expand Down Expand Up @@ -252,7 +261,18 @@ bool NTR_Secure_Init (u8* header, u8* sa_copy, u32 CartID, int iCardDevice)

iGameCode = *((vu32*)(void*)&header[0x0C]);
ReadDataFlags = cardControl13 & ~ NTRCARD_BLK_SIZE(7);
NTR_InitKey (iGameCode, iCardHash, nCardHash, iKeyCode, iCardDevice?1:2, iCardDevice);

if(iCardDevice && ((header[0x1BF] & 0x80) || (header[0x1C] & 0x04))) // dsi dev app
{
size_t fsize;
if (!CheckSupportFile(BLOWFISHKEYDEV_NAME, &fsize)) return false;

@d0k3 d0k3 Jul 5, 2026

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Instead of just checking for the availability of the key file, you could load it right away, and react to any failures here. Example (be careful, though, I may be missing something here):

if (iCardDevice && ((header[0x1BF] & 0x80) || (header[0x1C] & 0x04))) // dsi dev app
{
size_t fsize;
if (!CheckSupportFile(BLOWFISHKEYDEV_NAME, &fsize) || (fsize != 0x1048)) return false;
if (LoadSupportFile(BLOWFISHKEYDEV_NAME, iCardHash, 0x1048) != 0x1048) return false;
memset(iKeyCode, 0, sizeof(iKeyCode));
}
else // retail
{
NTR_InitKey (iGameCode, iCardHash, nCardHash, iKeyCode, iCardDevice?1:2, iCardDevice);
}

if (fsize != 0x1048) return false;
NTR_InitKey (iGameCode, iCardHash, nCardHash, iKeyCode, 1, 2);
}
else // retail
{
NTR_InitKey (iGameCode, iCardHash, nCardHash, iKeyCode, iCardDevice?1:2, iCardDevice);
}

if(!iCheapCard) flagsKey1 |= NTRCARD_SEC_LARGE;
//Debug("iCheapCard=%d, readTimeout=%d", iCheapCard, readTimeout);
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1 change: 1 addition & 0 deletions arm9/source/gamecart/secure_ntr.h
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Expand Up @@ -2,6 +2,7 @@

#include "common.h"

#define BLOWFISHKEYDEV_NAME "TwlBlowfishKeyDev.bin"

typedef struct _IKEY1{
u32 iii;
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