SySS-Research / syss-crc

Simple Python CRC implementation for playing around with cyclic redundancy checks

SySS CRC

Simple Python CRC implementation for playing around with cyclic redundancy checks, for instance when analyzing undocumented protocols or file formats.

Inspired by

• Online CRC Calculator by Anton Isakov
• Sunshine2k's CRC Calculator by Bastian Molkenthin

Caution: This simple Python implementation is not very fast, but it may be good enough for some test cases. If search spaces are quite large and/or more speed is required, consider using other CRC tools like bruteforce-crc.

Usage

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

from syss_crc import CRC

# main
if __name__ == "__main__":
    # simple usage example
    crc = CRC()
    crc.set_config_by_name("CRC-32")
    data = b"What's my CRC again?"
    c = crc.compute(data)
    print("[*] CRC-32 of test data '{:s}' is {:X}".format(data.decode("UTF-8"), c))

Disclaimer

Use at your own risk. Mainly for educational and tinkering purposes.