mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-22 22:38:08 +00:00
127 lines
3.4 KiB
Python
Executable File
127 lines
3.4 KiB
Python
Executable File
#!/usr/bin/env python3
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import click
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from pathlib import Path
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from hashlib import blake2s
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from trezorlib.firmware.core import FirmwareImage, Model
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ALIGNED_SIZE = 128 * 1024
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HERE = Path(__file__).parent
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BOOTLOADERS = HERE / ".." / "embed" / "models"
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TEMPLATE = """\
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#ifndef BOOTLOADER_HASHES_H
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#define BOOTLOADER_HASHES_H
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// Auto-generated file, do not edit.
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// clang-format off
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{patterns}
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// clang-format on
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#endif
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"""
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PATTERN = """\
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// {name} version {version}
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#define BOOTLOADER_{suffix}_00 {{{bytes_00}}}
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#define BOOTLOADER_{suffix}_FF {{{bytes_ff}}}
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"""
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def aligned_digest(fn: Path, data: bytes, padding: bytes) -> bytes:
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"""Calculate digest of data, aligned to ALIGNED_SIZE with
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the specified padding.
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Firmware needs to check the bootloader against a digest padded either by 0xff
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(unwritten NOR-flash byte) or 0x00 (explicitly cleared byte).
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"""
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if len(data) > ALIGNED_SIZE:
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raise ValueError(fn, "too big")
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assert len(padding) == 1
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digest_data = data + padding * (ALIGNED_SIZE - len(data))
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assert len(digest_data) == ALIGNED_SIZE
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return blake2s(digest_data).digest()
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def to_uint_array(data: bytes) -> str:
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"""Convert bytes to C array of uint8_t, like so:
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>>> to_uint_array(b"\\x00\\x01\\x02")
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"{0x00, 0x01, 0x02}"
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"""
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return ", ".join([f"0x{i:02x}" for i in data])
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def bootloader_str(file: Path, model: str) -> str:
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"""From a given file, generate the relevant C definition strings from PATTERN.
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Calculates the two padded hashes, one with 0x00 and the other 0xFF, and returns
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a string suitable for writing into bl_check.c.
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"""
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data = file.read_bytes()
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suffix = file.stem[len("bootloader_") :].upper()
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bytes_00 = to_uint_array(aligned_digest(file, data, b"\x00"))
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bytes_ff = to_uint_array(aligned_digest(file, data, b"\xff"))
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bl = FirmwareImage.parse(data)
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version_str = ".".join(str(x) for x in bl.header.version)
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if not isinstance(bl.header.hw_model, Model):
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raise ValueError(
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f"Model mismatch: {file.name} {model} (found {bytes(bl.header.hw_model).decode()})"
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)
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elif bl.header.hw_model.value != model.encode():
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raise ValueError(
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f"Model mismatch: {file.name} {model} (found {bl.header.hw_model.value})"
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)
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return PATTERN.format(
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name=file.name,
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version=version_str,
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suffix=suffix,
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bytes_00=bytes_00,
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bytes_ff=bytes_ff,
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)
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@click.command()
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@click.option("-c", "--check", is_flag=True, help="Do not write, only check.")
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def bootloader_hashes(check):
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models = list(BOOTLOADERS.iterdir())
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models = [model for model in models if model.is_dir()]
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for model in models:
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path = model / "bootloaders"
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if path.is_dir():
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header_file = path / "bootloader_hashes.h"
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patterns = []
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bootloaders = sorted(path.glob("bootloader*.bin"))
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for bootloader in bootloaders:
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print(f"Processing {bootloader}")
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patterns.append(bootloader_str(bootloader, model.name))
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content = TEMPLATE.format(patterns="\n".join(patterns))
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if not check:
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header_file.write_text(content)
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else:
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actual = header_file.read_text()
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if content != actual:
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raise click.ClickException(f"{header_file} differs from expected")
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if __name__ == "__main__":
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bootloader_hashes()
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