Created
October 3, 2017 19:01
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Switch Simple BCT parser
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#!/usr/bin/python3 | |
from struct import * | |
import sys | |
def main(): | |
args = sys.argv[1::] | |
if len(args) < 1: | |
print(sys.argv[0] + " boot.bct") | |
return | |
f = open(sys.argv[1], 'rb') | |
(num_entries, virtual_block_size, block_size, bct_key, bct_signature_hash, bct_signature) = unpack("IBB522x256s16s256s", f.read(0x0420)) | |
f.seek(0x0444) | |
bct_signature_hash = bct_signature_hash.hex().upper() | |
bct_signature_hash = bct_signature_hash if bct_signature_hash == ("0" * 0x10) else "none" | |
customer_data = f.read(0xC4).hex().upper() | |
customer_data = customer_data if customer_data == ("0" * 0xC4) else "none" | |
info = "BCT File\nEntry count: 0x{0:X}\nVirtual block size: 0x{1:X}\nBlock size: 0x{2:X}\nKey: {3}\nSignature Hash: {4}\nSignature: {5}\nCustomer Data: {6}" | |
print(info.format(num_entries, virtual_block_size, block_size, bct_key.hex().upper(), bct_signature_hash, bct_signature.hex().upper(), customer_data)) | |
#Ignore a lot of data that I don't need | |
f.seek(0x232C) | |
num_bootloaders = int.from_bytes(f.read(0x4), byteorder='little') | |
print("Bootloader count: {}".format(num_bootloaders)) | |
for i in range(num_bootloaders): | |
(version, start_block, start_page, length, load_addr, entry_point, attribute, bootloader_hash, bootloader_signature) = unpack("IIIIIII16s256s", f.read(0x12C)) | |
bootloader_hash = bootloader_hash.hex().upper() | |
bootloader_hash = bootloader_hash if bootloader_hash == ("0" * 0x10) else "none" | |
print("\nBootloader {0}\nVersion: 0x{1:X}\nBlock Start: 0x{2:X}\nStart Page: 0x{3:X}\nLength: 0x{4:X}\nLoad address: 0x{5:X}\nEntry point: 0x{6:X}\nAttribute: {7:X}\nHash: {8}\nSignature: {9}\n".format(i, version, start_block, start_page, length, load_addr, entry_point, attribute, bootloader_hash, bootloader_signature.hex().upper())) | |
f.close() | |
return | |
if __name__ == '__main__': | |
main() |
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