mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-27 09:58:27 +00:00
99 lines
3.3 KiB
Python
Executable File
99 lines
3.3 KiB
Python
Executable File
#!/usr/bin/env python3
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from __future__ import annotations
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import json
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from pathlib import Path
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import click
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from trezorlib import firmware, toif
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def minimum_header_len(spec, quiet):
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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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if not quiet:
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click.echo(f"Minimum header length: {data_length + 65} bytes.")
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return (data_length + 65 + 511) // 512 * 512
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FilePath = click.Path(dir_okay=False, path_type=Path)
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@click.command()
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@click.argument("specfile", type=FilePath)
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@click.option("-i", "--image", type=FilePath)
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@click.option("-o", "--outfile", type=FilePath)
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@click.option("-c", "--check", is_flag=True, help="Check but do not write header.")
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@click.option("-q", "--quiet", is_flag=True, help="Do not print anything.")
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def build_vendorheader(
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specfile: Path, image: Path | None, outfile: Path | None, check: bool, quiet: bool
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):
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if quiet:
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echo = lambda *args, **kwargs: None
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else:
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echo = click.echo
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if not specfile.exists():
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raise click.ClickException(f"Spec file {specfile.name} does not exist.")
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if image is None:
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image = specfile.with_suffix(".toif")
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if not image.exists():
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raise click.ClickException(f"Image file {image.name} does not exist.")
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if outfile is None:
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vh_stem = specfile.stem
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if vh_stem.startswith("vendor_"):
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vh_stem = vh_stem[len("vendor_") :]
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outfile = specfile.parent / f"vendorheader_{vh_stem}_unsigned.bin"
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spec = json.loads(specfile.read_text())
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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_bytes())
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spec["sigmask"] = 0
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spec["signature"] = b"\x00" * 64
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if spec["hw_model"] is None:
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spec["hw_model"] = b"\x00\x00\x00\x00"
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else:
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spec["hw_model"] = spec["hw_model"].encode("ascii")
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min_length = minimum_header_len(spec, quiet)
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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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echo(f"{specfile.name}: Header has correct length.")
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else:
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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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vh_bytes = firmware.VendorHeader.SUBCON.build(spec)
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if check:
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if not outfile.exists():
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raise click.ClickException(f"Header file {outfile.name} does not exist.")
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outfile_bytes = outfile.read_bytes()
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if outfile_bytes != vh_bytes:
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raise click.ClickException(
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f"Header file {outfile.name} differs from expected header."
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)
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else:
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outfile.write_bytes(firmware.VendorHeader.SUBCON.build(spec))
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if __name__ == "__main__":
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build_vendorheader()
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