trezor-firmware/core/tools/build_vendorheader

#!/usr/bin/env python3
import json

import click

from trezorlib import firmware


@click.command()
@click.argument("specfile", type=click.File("r"))
@click.argument("image", type=click.File("rb"))
@click.argument("outfile", type=click.File("wb"))
def build_vendorheader(specfile, image, outfile):
    spec = json.load(specfile)
    spec["pubkeys"] = [bytes.fromhex(k) for k in spec["pubkeys"]]
    spec["image"] = firmware.Toif.parse(image.read())
    spec["sigmask"] = 0
    spec["signature"] = b"\x00" * 64
    outfile.write(firmware.VendorHeader.build(spec))


if __name__ == "__main__":
    build_vendorheader()