trezor-firmware/firmware/bl_data.py

#!/usr/bin/env python
from hashlib import sha256

fn = '../bootloader/bootloader.bin'

data = open(fn, 'rb').read()
if len(data) > 32768:
    raise Exception('bootloader has to be smaller than 32768 bytes')

data += b'\x00' * (32768 - len(data))

h = sha256(sha256(data).digest()).digest()

bl_hash = ', '.join('0x%02x' % x for x in bytearray(h))
bl_data = ', '.join('0x%02x' % x for x in bytearray(data))

with open('bl_data.h', 'wt') as f:
    f.write('static const uint8_t bl_hash[32] = {%s};\n' % bl_hash)
    f.write('static const uint8_t bl_data[32768] = {%s};\n' % bl_data)