CikExtractor

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Tool to extract and derive stored CIKs and the unique device key from the registry.

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# CikExtractor

*Utility to dump stored packed CIK (Content Integrity Key) data for MSIXVC packages from the registry. Additionally leverages emulation to derive your device encryption key to decrypt the CIKs for normal usage.*

## Disclaimer

**Warning: All keys derived and decrypted by this tool are sensitive information. You should never share a derived key with anyone, especially not your unique device key. This tool is for educational and research purposes only.**

## Requirements

- [.NET 10.0.x](https://dotnet.microsoft.com/en-us/download/dotnet/10.0) installed
- Administrator privileges (for dumping the required registry keys)

## Usage

- Download the [latest release](https://github.com/LukeFZ/CikExtractor/releases/latest).
- Extract the downloaded zip file.
- Run *CikExtractor.exe*.

The derived device key will be printed to the console, and will also be saved to *deviceKey.txt* in the app directory.
Decrypted CIKs will be saved in the *Cik* subfolder.

## Advanced Usage

```
USAGE:
    CikExtractor.exe [OPTIONS]

OPTIONS:
                             DEFAULT
    -h, --help                                Prints help information
    -c, --export-cik-path    Cik              Folder to extract CIKs into
    -d, --device-key-path    deviceKey.txt    File to read/write device key from/into
    -r, --reg-hive                            Path to an already exported registry hive exported by the 'export-hive' command

COMMANDS:
    dump                    Derives the device key and decrypts all CIKs stored in the registry. Default command.
    export-hive <path>      Export the registry hive containing the CIKs into a file.
    export-params <path>    Export the parameters needed to derive a device key.
                            Useful if you want to run the key derivation on another device.
    derive <path>           Derives a device key from the exported parameters of the 'export-params' command.
```

## How to use the keys for decryption

You can use the generated *Cik* directory and the keys within with [xvdtool, by emoose.](https://github.com/emoose/xvdtool)
Example command:
```
// To decrypt (Note: will in-place-decrypt, so replacing the existing file):
./xvdtool.exe -nd -eu -cik "<cik-guid-here>" -cikfile "<path-to-.cik-file>" <path-to-msixvc-file>

// Then, to extract the files within:
./xvdtool.exe -nd -xf "<path-to-output-folder>" <path-to-decrypted-msixvc-file>
```

The keys can also be used with [XvdTool.Streaming.](https://github.com/LukeFZ/XvdTool.Streaming)

You can also use the derived device key to decrypt local XML licenses that contain keys directly, but that is not currently implemented.

## Special Thanks

- [XvddKeyslotUtil](https://github.com/billyhulbert/XvddKeyslotUtil), by billyhulbert
	- Inspired me to also look into how Windows handles CIKs and their storage/derivation.
- [Information about SystemPolicyInfo](https://github.com/KiFilterFiberContext/windows-software-policy), by KiFilterFiberContext
	- Their findings helped me to better understand the licensing flow and how all of the different parts work together, and their unpacking script inspired me to also use Qiling for the vault emulation when it was still needed.
- [xvdtool](https://github.com/emoose/xvdtool) and [this SPLicenseBlock struct](https://github.com/emoose/xbox-reversing/blob/master/templates/SPLicenseBlock.bt), both by emoose & tuxuser
-

## Third party libraries used
- [BouncyCastle](https://bouncycastle.org)
- [Spectre.Console](https://spectreconsole.net)
- [Registry](https://github.com/EricZimmerman/Registry)

CikExtractor

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