Homebrew [Concept] Injecting code into DSiWare .bin/.nds

ParzivalWolfram

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Since Flipnote and the DSi Browser are encrypted using the DSi's common key AND since there's a way to turn these into .nds-format ROMs, would there be a way to write, say, a simple SD loader, inject it into a decrypted DSiWare image, re-encrypt and re-sign the new image, then copy it onto NAND?
If you encrypted/signed it properly, you could just copy it to NAND in Settings, so that's not too much of a problem, and IIRC the signature's on Nintendo's servers, so would this be feasible?
 
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Roboman

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You cannot sign files so easily. Signatures are very easy to check, but nearly impossible to forge without the right key.
 

Gericom

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Every single byte you change will change the signature and without the key (or a bug in the signature checking) it's impossible to sign this ourselves
 

The Real Jdbye

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Since Flipnote and the DSi Browser are encrypted using the DSi's common key AND since there's a way to turn these into .nds-format ROMs, would there be a way to write, say, a simple SD loader, inject it into a decrypted DSiWare image, re-encrypt and re-sign the new image, then copy it onto NAND?
If you encrypted/signed it properly, you could just copy it to NAND in Settings, so that's not too much of a problem, and IIRC the signature's on Nintendo's servers, so would this be feasible?
Wait for the new DSi exploit ;)
 

DinohScene

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Doing that basically defeats the purpose of having a homebrew loader/channel
And like Gericom said, you can't change bytes without breaking signatures.
Seeing the DSi actually is "good" at checking sigs, this won't happen.
 

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