mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-28 09:08:07 +00:00
104 lines
2.8 KiB
Python
Executable File
104 lines
2.8 KiB
Python
Executable File
#!/usr/bin/env python3
|
|
from pathlib import Path
|
|
from hashlib import blake2s
|
|
|
|
from trezorlib.firmware.core import FirmwareImage
|
|
|
|
ALIGNED_SIZE = 128 * 1024
|
|
|
|
HERE = Path(__file__).parent
|
|
BOOTLOADERS = HERE / "bootloaders"
|
|
|
|
BL_CHECK = HERE / "bl_check.c"
|
|
|
|
BL_CHECK_AUTO_BEGIN = "// --- BEGIN GENERATED BOOTLOADER SECTION ---\n"
|
|
BL_CHECK_AUTO_END = "// --- END GENERATED BOOTLOADER SECTION ---\n"
|
|
|
|
PATTERN = """\
|
|
// {name} version {version}
|
|
#define BOOTLOADER_{suffix}_00 {{{bytes_00}}}
|
|
#define BOOTLOADER_{suffix}_FF {{{bytes_ff}}}
|
|
"""
|
|
|
|
|
|
def aligned_digest(data: bytes, padding: bytes) -> bytes:
|
|
"""Calculate digest of data, aligned to ALIGNED_SIZE with
|
|
the specified padding.
|
|
|
|
Firmware needs to check the bootloader against a digest padded either by 0xff
|
|
(unwritten NOR-flash byte) or 0x00 (explicitly cleared byte).
|
|
"""
|
|
if len(data) > ALIGNED_SIZE:
|
|
raise ValueError(fn, "too big")
|
|
|
|
assert len(padding) == 1
|
|
digest_data = data + padding * (ALIGNED_SIZE - len(data))
|
|
assert len(digest_data) == ALIGNED_SIZE
|
|
return blake2s(digest_data).digest()
|
|
|
|
|
|
def to_uint_array(data: bytes) -> str:
|
|
"""Convert bytes to C array of uint8_t, like so:
|
|
|
|
>>> to_uint_array(b"\\x00\\x01\\x02")
|
|
"{0x00, 0x01, 0x02}"
|
|
"""
|
|
return ", ".join([f"0x{i:02x}" for i in data])
|
|
|
|
|
|
def bootloader_str(file: Path) -> str:
|
|
"""From a given file, generate the relevant C definition strings from PATTERN.
|
|
|
|
Calculates the two padded hashes, one with 0x00 and the other 0xFF, and returns
|
|
a string suitable for writing into bl_check.c.
|
|
"""
|
|
data = file.read_bytes()
|
|
|
|
suffix = file.stem[len("bootloader_") :].upper()
|
|
bytes_00 = to_uint_array(aligned_digest(data, b"\x00"))
|
|
bytes_ff = to_uint_array(aligned_digest(data, b"\xff"))
|
|
|
|
try:
|
|
bl = FirmwareImage.parse(data)
|
|
version_str = ".".join(str(x) for x in bl.header.version)
|
|
except Exception:
|
|
version_str = "<unknown>"
|
|
|
|
return PATTERN.format(
|
|
name=file.name,
|
|
version=version_str,
|
|
suffix=suffix,
|
|
bytes_00=bytes_00,
|
|
bytes_ff=bytes_ff,
|
|
)
|
|
|
|
|
|
def main():
|
|
bl_check_new = []
|
|
with open(BL_CHECK) as f:
|
|
# read up to auto-begin
|
|
for line in f:
|
|
bl_check_new.append(line)
|
|
if line == BL_CHECK_AUTO_BEGIN:
|
|
break
|
|
|
|
# write bootloader definitions
|
|
for file in sorted(BOOTLOADERS.glob("bootloader*.bin")):
|
|
bl_check_new.append(bootloader_str(file))
|
|
|
|
# consume up to auto-end
|
|
for line in f:
|
|
if line == BL_CHECK_AUTO_END:
|
|
bl_check_new.append(line)
|
|
break
|
|
|
|
# read the rest
|
|
bl_check_new.extend(f)
|
|
|
|
# write the file
|
|
BL_CHECK.write_text("".join(bl_check_new))
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main()
|