Homebrew Need help with DSi

Foxi4

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Posting the same link twice doesn't help (I also have to remove your link since it cross-links to warez .SDAT files).

DSiWare games are encrypted and signed with your unique console key - cartridge-based games and DSiWare are two different beasts. The key is located in dev.kp, a file created in your system's NAND as you first entered the DSi store. Retrieving that key used to be possible using two exploits - DSiHax and WinterMute's exploit, both were patched by Nintendo. You'll have to get your hands on that key by extracting dev.kp from your NAND and decrypting it first if you want the binary to be executable after you're done, you need it in order to re-sign the file, decrypting it isn't the only step you need to take. Doing that will require you to connect your NAND to an MMC-compatible dongle. I suggest looking up DSiBrew for details. If you just want to extract something, decrypting is probably all you need to do.

Here's a link to DSiBrew's description of ES block encryption, it might be what you're looking for. They also link to a couple of tools that you could use: http://dsibrew.org/wiki/ES_block_encryption
 
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