ROM Hack [Release] 3DS_CTR_Decryptor-VOiD

[jqrn]

Part of the process for decrypting ROMs. If you don't understand it in terms that have already been posted, this isn't for you.



Buy one. Or get other people to test it for you.

I got a 4.5 3ds. But i am not understanding everything and all the terms in this thread either. But if I don't read and try to understand, I for sure will never learn.
So telling that this isn't for us is crap.
Now you go Shoo! Shoo!

 

[Parasite X]

You are correct. We made this since no one else would share. All of our source is included. We made this because we wanted to rip music, create level editors for SM3DL and mod like Project M for SSB (although we will need 7.x decryption for that I believe).

What custom levels do you have in mind bro

 

[Twili]

OK, I would help you but my internet is too slw and the xopad files are as big as the trimmed rom. Can you explain how it is done? I already have the romfs.xor file but I can't open it with 3dsexplorer and I don't know how to use ctrtool.

I'm not 100% sure how to read the romfs archive itself, but I know how to locate individual files from that game to extract. I'll send you a PM shortly.

 

[piratesephiroth]

OK, I would help you but my internet is too slw and the xopad files are as big as the trimmed rom. Can you explain how it is done? I already have the romfs.xor file but I can't open it with 3dsexplorer and I don't know how to use ctrtool.

really? This was posted in the previous page:

use 3dsexplorer's 'xor tool'. Input the xorpad and the file you wish to decrypt as 'first file' and 'second file' respectively and then save the output.

 

[aliak11]

When I run this ctrtool --romfsdir out_directory RomFS.xor, I get "Unknown File". What am I doing wrong?

 

[kyogre123]

really? This was posted in the previous page:

Can you not read properly what I asked¡

 

[loco365]

Well, I'm looking at this and hoping and wishing. This is really interesting. Looking forward to seeing results.

 

[y03usw6e]

When I run this ctrtool --romfsdir out_directory RomFS.xor, I get "Unknown File". What am I doing wrong?

I'm getting the same thing. Not sure why.

 

[Twili]

Can you not read properly what I asked¡

I have some simple tools for those who don't want to use 3dsexplorer but want to decrypt a romfs. They're pretty slow, but they work.

http://www.mediafire.com/download/qipafy450qsv3aq/romfsdecryption.zip

1. Extract getromfs.exe and xor.exe to the same folder as the ROM that you obtained the romfs xorpad for, and put the xorpad in that folder as well.

2. Click and drag your ROM into getromfs.exe and it will extract the encrypted romfs for the rom as EncryptedRomFS.bin. Don't close the cmd window. It will close on its own when it's done. It will take a couple minutes.

3. Click and drag the xorpad for the romfs into xor.exe and it will xor EncryptedRomFS.bin with the xorpad to decrypt it. It will output DecryptedRomFS.bin. AGAIN, IT'S SLOW. DON'T CLOSE THE CMD WINDOW. IT WILL CLOSE ON ITS OWN.

 

[kyogre123]

I have some simple tools for those who don't want to use 3dsexplorer but want to decrypt a romfs. They're pretty slow, but they work.

http://www.mediafire.com/download/qipafy450qsv3aq/romfsdecryption.zip

1. Extract getromfs.exe and xor.exe to the same folder as the ROM that you obtained the romfs xorpad for, and put the xorpad in that folder as well.

2. Click and drag your ROM into getromfs.exe and it will extract the encrypted romfs for the rom as EncryptedRomFS.bin. Don't close the cmd window. It will close on its own when it's done. It will take a couple minutes.

3. Click and drag the xorpad for the romfs into xor.exe and it will xor EncryptedRomFS.bin with the xorpad to decrypt it. It will output DecryptedRomFS.bin. AGAIN, IT'S SLOW. DON'T CLOSE THE CMD WINDOW. IT WILL CLOSE ON ITS OWN.

That's neat but what's the next step? So, there's no tool to extract the files from the decrypted romFS? Am I getting something wrong?

 

[Twili]

That's neat but what's the next step? So, there's no tool to extract the files from the decrypted romFS? Am I getting something wrong?

Take a large screenshot of the decrypted romfs in a hex editor and send me a PM and I'll see how I can help.

EDIT: Take several screenshots, showing more of the data each time.

 

[Duo8]

Noice
Is it possible to work out how the AES engine works with this?

That's neat but what's the next step? So, there's no tool to extract the files from the decrypted romFS? Am I getting something wrong?

ctrtool

 

[kyogre123]

Take a large screenshot of the decrypted romfs in a hex editor and send me a PM and I'll see how I can help.

EDIT: Take several screenshots, showing more of the data each time.

I actually got a file of 0bytes with your tool, I don't know why... the EncryptedRomFS was extracted fine though.

 

[aliak11]

Noice
Is it possible to work out how the AES engine works with this?



ctrtool

How? When I run this "ctrtool --romfsdir=RomFS DecryptedRomFS.bin", I get "Unknown File". What am I doing wrong?

 

[NyaakoXD]

I like where this is going. Especially the part about fan translations since there are lots of games that I want to play that were only released in Japan.

 

[Duo8]

Wait. How large is the ncchinfo.bin?
If it just the few keys then did the AES engine created a xorpad the size of the ROM? With only a few keys?

 

[Twili]

I actually got a file of 0bytes with your tool, I don't know why... the EncryptedRomFS was extracted fine though.

If you get a file of 0 bytes, it's because the xorpad is a bad size. However, I can modify it to decrypt it anyways. Do you want me to?

 

[kyogre123]

If you get a file of 0 bytes, it's because the xorpad is a bad size. However, I can modify it to decrypt it anyways. Do you want me to?

Why is it a bad size? Are you saying both files have to be the same size? This is strange since the tool supposedly xorpaded everything, I even got the "Finished" lettering.

 

[Twili]

Why is it a bad size? Are you saying both files have to be the same size? This is strange since the tool supposedly xorpaded everything, I even got the "Finished" lettering.

How big are both files? And yes, it will say "finished" even if it didn't do anything. But what are the sizes of both?

 

[kyogre123]

xorpad 622,592kb vs encrypted romFS 622,268kb

I got every single xorpad, by the way.