A python script for generating digital signatures for Xbox Saves
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Xbox Save Sig

The original Xbox (2001) has cryptographically signed saves, to edit or manipulate them you need to be able to resign the save with the games unique key. This key is generated using 2 input sources, the master Xbox key and the games unique signing key.

xboxsig.py is a python utility to generate the keys used for resigning saves.

Basic Usage

The minimum information you need to supply to xboxsig.py is the games executable file (default.xbe) or a text representation of the games signature key:

python xboxsig.py -i /path/to/default.xbe


python xboxsig.py -g E34B1AE87CDE555DC5A5CC7E30DDAACE

The output will be a text representation of the digital signature for save signing: 737E064C0236BA3E7140EC2B91D76766

Advanced Options

Additional parameters can be supplied on the command line:

option result
-t Outputs the Title Name from the default.xbe file in addition to the signature. Has no effect if the -g option is used in place of -i
-o <filename> Outputs to the supplied file instead of the console
-f <format> Outputs the key in a specified format, valid options are covered in the Output Format section
-x <Xbox key in text form> Use the Xbox key supplied on the command line instead of the master key. Should not be used unless you have a specific need to change Xbox key

Output Format

The save signing key is calculated as a 20 byte digest but only the first 16 bytes are used when signing files. There are 3 options for the output format, the default is 'native' and is used if this option is skipped.

Format Description Output format
native Key is displayed as a 16 byte signature 737E064C0236BA3E7140EC2B91D76766
raw Full 20 byte digest 737E064C0236BA3E7140EC2B91D76766C1F4B510
xbtf Xbox Trainer Format 0X73, 0X7E, 0X06, 0X4C, 0X02, 0X36, 0XBA, 0X3E, 0X71, 0X40, 0XEC, 0X2B, 0X91, 0XD7, 0X67, 0X66

Example: python xboxsig.py -i default.xbe -f xbtf

Output: 0X73, 0X7E, 0X06, 0X4C, 0X02, 0X36, 0XBA, 0X3E, 0X71, 0X40, 0XEC, 0X2B, 0X91, 0XD7, 0X67, 0X66