mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-23 14:58:09 +00:00
76 lines
2.6 KiB
Python
Executable File
76 lines
2.6 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
import json
|
|
from pathlib import Path
|
|
|
|
import click
|
|
|
|
from trezorlib import firmware, toif
|
|
|
|
|
|
def minimum_header_len(spec):
|
|
spec = spec.copy()
|
|
spec["header_len"] = 512000
|
|
reparsed = firmware.VendorHeader.SUBCON.parse(
|
|
firmware.VendorHeader.SUBCON.build(spec)
|
|
)
|
|
data_length = reparsed._end_offset - reparsed._start_offset
|
|
# data length + 65 for signatures, rounded up to nearest multiple of 512
|
|
return (data_length + 65 + 511) // 512 * 512
|
|
|
|
|
|
@click.command()
|
|
@click.argument("specfile", type=click.File("r"))
|
|
@click.argument("image", type=click.File("rb"))
|
|
@click.argument("outfile", type=click.Path(dir_okay=False, writable=True, path_type=Path))
|
|
@click.option("-c", "--check", is_flag=True, help="Check but do not write header.")
|
|
@click.option("-q", "--quiet", is_flag=True, help="Do not print anything.")
|
|
def build_vendorheader(specfile, image, outfile, check: bool, quiet: bool):
|
|
if quiet:
|
|
echo = lambda *args, **kwargs: None
|
|
else:
|
|
echo = click.echo
|
|
|
|
spec = json.load(specfile)
|
|
spec["pubkeys"] = [bytes.fromhex(k) for k in spec["pubkeys"]]
|
|
spec["image"] = toif.ToifStruct.parse(image.read())
|
|
spec["sigmask"] = 0
|
|
spec["signature"] = b"\x00" * 64
|
|
if spec["hw_model"] is None:
|
|
spec["hw_model"] = b"\x00\x00\x00\x00"
|
|
else:
|
|
spec["hw_model"] = spec["hw_model"].encode("ascii")
|
|
|
|
min_length = minimum_header_len(spec)
|
|
if "header_len" not in spec:
|
|
spec["header_len"] = min_length
|
|
elif spec["header_len"] < min_length:
|
|
raise click.ClickException(
|
|
f"Specified header_len {spec['header_len']} too low. "
|
|
f"Minimum allowable value is {min_length}."
|
|
)
|
|
elif spec["header_len"] == min_length:
|
|
echo(f"{specfile.name}: Header has correct length.")
|
|
else:
|
|
echo(
|
|
f"{specfile.name}: Extending header ({min_length} bytes) to {spec['header_len']} bytes."
|
|
)
|
|
|
|
if spec["header_len"] % 512 != 0:
|
|
raise click.ClickException("Invalid header_len: must be a multiple of 512")
|
|
|
|
vh_bytes = firmware.VendorHeader.SUBCON.build(spec)
|
|
if check:
|
|
if not outfile.exists():
|
|
raise click.ClickException(f"Header file {outfile.name} does not exist.")
|
|
outfile_bytes = outfile.read_bytes()
|
|
if outfile_bytes != vh_bytes:
|
|
raise click.ClickException(
|
|
f"Header file {outfile.name} differs from expected header."
|
|
)
|
|
else:
|
|
outfile.write_bytes(firmware.VendorHeader.SUBCON.build(spec))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
build_vendorheader()
|