Hi. First off, I'd like to say that I will never be involved in any business involving 3DS hacking. I do this for fun. I enjoy reversing and finding exploits on consoles, although, this is the first exploit I have found that proves useful.
To those who have extracted the data from the patch (decrypting is the hard part, but some people already know how to do this) - you may notice a function that will override signature checks by calling it with a key stored in the decrypted package. I guess Nintendo has a whitelist for certain keys? I haven't yet looked into the signature checking function yet but could not find the decrypted key anywhere in the 3DS RAM, so it's obviously somewhat encrypted. The decrypted key is 8 bytes long.
This allows us to sign our own packages using the same key and override function. I already have a 3D "Hello world" application running! There is no good reason I can think of for Nintendo doing this, I believe that they used it for eShop debugging and forgot to remove it. A simple mistake. But be quick to look because I am sure they will remove it in a new firmware sooner or later.
Sorry for any bad English
To those who have extracted the data from the patch (decrypting is the hard part, but some people already know how to do this) - you may notice a function that will override signature checks by calling it with a key stored in the decrypted package. I guess Nintendo has a whitelist for certain keys? I haven't yet looked into the signature checking function yet but could not find the decrypted key anywhere in the 3DS RAM, so it's obviously somewhat encrypted. The decrypted key is 8 bytes long.
This allows us to sign our own packages using the same key and override function. I already have a 3D "Hello world" application running! There is no good reason I can think of for Nintendo doing this, I believe that they used it for eShop debugging and forgot to remove it. A simple mistake. But be quick to look because I am sure they will remove it in a new firmware sooner or later.
Sorry for any bad English