crcFinder 0.0.2

A tool to find well known crc params that matches the input data and crc result (right or wrong)

CrcFinder

A tool to find well known crc params that matches the input data and crc result (right or wrong)

Install

pip install crcFinder

Usage

As Library

find zlib.crc32

from crcFinder import CrcFinder
import zlib

data = []
data.append((b"123456789", zlib.crc32(b'123456789')))
data.append((b"123456789xxxx", zlib.crc32(b'123456789xxxx')))
f = CrcFinder()
r = f.findCrc(data)
print([str(i) for i in r])

find something else

from crcFinder import CrcFinder
data = []
data.append((b"123456789\x09", b'\x11\x60\x7a\x37'))
data.append((b"1234567890\x0a", b'\xb3\x95\xcb\x46'))
f = CrcFinder()
r = f.findCrc(data)
print(r[0])

use CrcCalculator directly

from crcFinder import CrcCalculator, ShiftType
crc_pkzip = CrcCalculator(32, 0x04c11db7, 0xffffffff, True, True, 0xffffffff, ShiftType.LEFT, ShiftType.LEFT)
assert(crc_pkzip.check() == 0xcbf43926)

cli

python3 -m crcFinder -d 616263646566,4b8e39ef
python3 -m crcFinder -d 616263646566,0x4b8e39ef 313233343536373839,0xcbf43926

Reference

• https://reveng.sourceforge.io/crc-catalogue/all.htm
• https://github.com/Michaelangel007/crc32