Encrypted ROMs freeze at a white screen without any further output

[JesseTG]

What version of melonDS DS are you using?

1.1.7

Does the problem happen in standalone melonDS?

I don't know.

What happened?

When decrypting a ROM fails, the DS will freeze at a blank white screen. This is expected behavior, but freezing like this is a bad experience for emulators.

What should've happened instead?

I should detect encrypted ROMs in advance; if they're encrypted, I should exit with an error message unless using native sysfiles.

Which platforms do you see the problem on?

• Windows
• macOS
• Linux
• Android
• iOS
• tvOS
• Other (specify below)

Which versions of the OS?

10

Which libretro frontend are you using?

RetroArch 1.19.0

Terms

• I agree to follow the code of conduct.
• I understand that melonDS DS is not developed or maintained by the authors of melonDS.
• I understand that this form is for reporting bugs, not for requesting help.
• I understand that the author develops this core in his spare time, and that he is under no obligation to respond to this bug report.

[JesseTG]

Suggestions from Nadia and CasualPokePlayer:

Nadia: well, for you it seems easy enough
if encryObj is not there and not using official BIOS then fail
CasualPokePlayer:
more, check if FFh,DEh,FFh,E7h,FFh,DEh,FFh,E7h is present, if it is, it's decrypted already
if you want to go further, than with official bios you can check if the decryption works or not

Relevant part of GBATek is here http://problemkaputt.de/gbatek-ds-cartridge-secure-area.htm