Un tool per manipolare i file XVD e XVC dell'Xbox One, ad oggi è poco utile perché i pacchetti sono criptati e firmati; si posta con la speranza che possa essere utile in un futuro.

XVDtool

xvdtool is a utility coded in C# to manipulate Xbox One XVD (and XVC) packages.

It can print detailed info about package headers, resign, rehash, en/decrypt and verify data integrity of a package, it can also convert (some, but not all) decrypted XVD files to VHD.

Currently it's only been tested with dev-crypted packages as the retail 256-bit ODK (Origin Decryption Key?) is unknown. It's assumed based on observations of older system files that the retail ODK is stored in the Xbox One's NAND, inside a sort of encrypted keyvault (sp_s.cfg). The keyvaults encryption/decryption is handled by a hardware component inside the Xbox One's CPU called the PSP (Platform Security Processor).

It seems like this PSP may also hold unique keys per-console used to decrypt the sp_s.cfg file, as the encrypted sp_s data is completely different for each console. It'll probably require a HostOS exploit to access the PSP and extract things from it, and since only the HostOS can access the PSP dev kits would also need an exploit in order to access it (as dev kits can only use debug tools on the SystemOS / GameOS partitions, debugging the HostOS seems to be for Microsoft internal developers only)

Until the retail ODK has been found this tool is useless for 90% of people, but developers looking into how XVD files work will find a detailed mapping of the XVD structures and complete methods for manipulating them.

However no encryption keys are provided with this tool, you'll have to find them yourself. MD5 hashes for the dev keys are provided below, but if you have an Xbox One development kit installed the keys can automatically be extracted from there too.

Also included is a tool for extracting files from the XBFS (Xbox Boot File System) inside the Xbox One NAND, it's not much different from tuxuser's NANDOne tool except that it includes filenames for the XBFS entries, and also has a (very) small part of the NAND mapped out.
Usage

Usage : xvdtool.exe [parameters] [filename]

Parameters:

-h (-help) - print xvdtool usage
-i (-info) - print info about package
-wi (-writeinfo) - write info about package to [filename].txt
-o (-output) <output-path> - specify output filename
-nd (-nodatahash) - disable data hash checking, speeds up -l and -f
-ne (-noextract) - disable data (embedded XVD/user data) extraction, speeds up -l and -f
-nn (-nonatives) - disable importing native windows functions (ncrypt etc)
note that signature verification/resigning won't work with this!

-eu (-decrypt) = decrypt output xvd
-ee (-encrypt) [keyid] = encrypt output xvd
(optional keyid param for XVCs to choose which key inside cik_keys.bin to use)
XVDs will have a new CIK generated, which will be encrypted with the odk_key.bin and stored in the XVD header

-hd (-removehash) - remove hash tree/data integrity from package
-he (-addhash) - add hash tree/data integrity to package

-r (-rehash) - fix data integrity hashes inside package
-rs (-resign) - sign package using the private key from rsa3_key.bin

-xe (-extractembedded) <output-file> - extract embedded XVD from package
-xu (-extractuserdata) <output-file> - extract user data from package
-xv (-extractvhd) <output-vhd> - extracts filesystem from XVD into a VHD file, doesn't seem to work properly with XVC packages yet (also removes NTFS compression from output VHD so Windows can mount it, use -nn to disable)

The next two commands will write info about each package found to [filename].txt
also extracts embedded XVD and user data to [filename].exvd.bin / [filename].userdata.bin
-l (-filelist) <path-to-file-list> - use each XVD specified in the list
-f (-folder) <path-to-folder> - scan folder for XVD files

Note that to mount an XVD/XVC in Windows you'll have to decrypt it and remove the hash tables first (-eu -hd)

To decrypt non-XVC packages you'll need the correct ODK, this key should be saved as odk_key.bin in the same folder as xvdtool. The devkit ODK is "widely known" and a MD5 hash is provided below, but as mentioned above the retail key is currently unknown.

Decrypting XVC packages is a different matter, XVC packages use a CIK (Content ?? Key?) located outside the package (as opposed to non-XVC packages having the CIK inside the package, albeit an encrypted version which is decrypted with the ODK).

Devkit/test-signed XVC packages use a static CIK which is also "widely known", with a MD5 hash provided below, this key should be saved as cik_key.bin. Retail packages have their CIK stored in an encrypted form inside license data retrieved from Xbox Live/the game disk. The key to decrypt this CIK is unknown (most likely stored in the PSP keyvault). If you have the correct decrypted CIK for a given package you should be able to just save it as cik_key.bin to decrypt the package.
Required Files

To make full use of this tool you will need the following files, which are not included. However the tool will work fine without them, but some functions might not work.

If you have an Xbox One development kit installed xvdtool will also try to extract the keys from there (if one of the keys is missing)

cik_keys.bin (CIK keys for XVC crypto, first entry should be the key used by SDK tools/devkits), format: [16 byte encryption key GUID][32 byte CIK]

md5sum: C9E58F4E1DC611E110A849648DADCC9B

odk_key.bin (ODK key used by SDK tools/devkits), format: [32 byte ODK]

md5sum: A2BCFA87F6F83A560BD5739586A5D516

rsa3_key.bin (RSA key used by SDK tools to sign packages), format: RSAFULLPRIVATEBLOB struct

md5sum: 2DC371F46B67E29FFCC514C5B134BF73

These files should be placed in the same folder as xvdtool.exe (xvdtool will also look for them in the root of any drives on your system, so the exe can be copied to different locations without needing to copy the keys with it.)
What are XVDs?

XVD packages are a secured file format used by the Xbox One to store data, an evolution on the Xbox 360's STFS packages. XVD files are usually used to store system images/data while XVCs (a slightly modified variant of XVDs) are used to store game data.

For a more detailed explanation of XVD files see xvd_info.md
Help / Support

xvdtool has only been tested on Windows but it might work on other systems via Mono. It does use some Windows imports to create/verify signatures but these imports can be disabled with the -nn parameter.

There's no help given for this tool besides this readme, it's also currently very experimental and very likely to blow up in your face. If you do encounter any bugs please submit a description of what happened to the issue tracker.

If you want to help out with development feel free, just make a fork of this repo, make your changes in a new branch of that fork and then submit a pull request from that branch to the master branch of this repo.

Donations to help me buy an Xbox One to try things with (as I'm still stuck with a 360 ;_ are appreciated, my bitcoin address is 17gkhLUF1UBMjfb2goaR39AN9RVUvNmAim
Autore: noob25x - Disponibile su GitHUB