mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-18 21:48:13 +00:00
54 lines
1.7 KiB
Python
Executable File
54 lines
1.7 KiB
Python
Executable File
#!/usr/bin/env python3
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import json
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import click
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from trezorlib import firmware, toif
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def minimum_header_len(spec):
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spec = spec.copy()
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spec["header_len"] = 512000
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reparsed = firmware.VendorHeader.SUBCON.parse(
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firmware.VendorHeader.SUBCON.build(spec)
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)
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data_length = reparsed._end_offset - reparsed._start_offset
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# data length + 65 for signatures, rounded up to nearest multiple of 512
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return (data_length + 65 + 511) // 512 * 512
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@click.command()
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@click.argument("specfile", type=click.File("r"))
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@click.argument("image", type=click.File("rb"))
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@click.argument("outfile", type=click.File("wb"))
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def build_vendorheader(specfile, image, outfile):
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spec = json.load(specfile)
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spec["pubkeys"] = [bytes.fromhex(k) for k in spec["pubkeys"]]
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spec["image"] = toif.ToifStruct.parse(image.read())
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spec["sigmask"] = 0
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spec["signature"] = b"\x00" * 64
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min_length = minimum_header_len(spec)
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if "header_len" not in spec:
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spec["header_len"] = min_length
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elif spec["header_len"] < min_length:
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raise click.ClickException(
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f"Specified header_len {spec['header_len']} too low. "
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f"Minimum allowable value is {min_length}."
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)
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elif spec["header_len"] == min_length:
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click.echo(f"{specfile.name}: Header has correct length.")
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else:
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click.echo(
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f"{specfile.name}: Extending header ({min_length} bytes) to {spec['header_len']} bytes."
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)
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if spec["header_len"] % 512 != 0:
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raise click.ClickException("Invalid header_len: must be a multiple of 512")
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outfile.write(firmware.VendorHeader.SUBCON.build(spec))
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if __name__ == "__main__":
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build_vendorheader()
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