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UPDATE: adding URL, which I forgot in original post:
https://github.com/tsunghowu/DiskImageCreator
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DiskImageCreator : A python utility to process the input raw disk image and sign MBR/partitions with given corresponding keys.
Signing Tool for boot security validation.
This python utility is designed to provide a baseline for people who may be interested in attaching the machine with secure boot process built-in. The secure boot process is a customized chain-of-trust boot flow in UEFI BIOS. It will exam the target disk image(in MBR) and see if it is properly signed by the root key controlled by owner. This utility is to help owner to create a signed image with owner keys.
This tool is designed to help people attack the machine with a secure chain-of-trust boot process in UEFI BIOS.
Firmware Security 