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CRC RevEng is a portable, arbitrary-precision CRC calculator and algorithm finder. It calculates CRCs using any of the 113 preset algorithms, or a user-specified algorithm to any width. It calculates reversed CRCs to give the bit pattern that produces a desired forward CRC. CRC RevEng also reverse-engineers any CRC algorithm from sufficient correctly formatted message-CRC pairs and optional known parameters. It comprises powerful input interpretation options. Compliant with Ross Williams' Rocksoft(tm) model of parametrised CRC algorithms.

Features

  • Reverse-engineers CRC algorithms
  • Arbitrary precision, calculates and solves CRCs of any bit width
  • Bit oriented, accepts messages of any bit length
  • Handles binary, octal, hex, and text input strings, 7-bit and 8-bit files
  • Calculates CRCs forwards or backwards, to help produce a desired CRC value
  • Define your own algorithm, or use one of 113 traceable presets
  • Written in portable C, adapts to most architectures

Project Samples

Help display Calculating CRCs Calculating reversed CRCs Reverse-engineering CRC algorithms

Project Activity

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Categories

Algorithms, Mathematics, Information Analysis, Calculators

License

GNU General Public License version 3.0 (GPLv3)

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CRC RevEng Web Site

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  • rasz Posted 2025-12-04
    Fantastic tool. Effortlessly and quickly allowed reverse engineering 16, 32 and 48bit CRC/ECC polynomials used by ancient MFM/RLL disk controllers. Very helpful for my sigrok-disk MFM/RLL Disk decoder plugin.
  • moutaz Posted 2020-05-30
    Fantastic, I only wished it to have a GUI, but even though, it worked flawlessly from the first try and saved me a lot of time :)
  • sneetsher Posted 2016-11-17
    Nice project for such specific job. It help me to gain much time writing my own to reverse crc of raw data from a sondex memory after GE support avoided to tell me. And finally I could fix the corrupted file.
  • sathya108 Posted 2014-07-04
    Really good project! It probably saved me a lot of time ;-).
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Additional Project Details

Operating Systems

BSD, Linux, Mac, RISC OS, Windows

Intended Audience

Developers, Engineering, Information Technology, Security Professionals, Telecommunications Industry

User Interface

Command-line

Programming Language

C

Related Categories

C Algorithms, C Mathematics Software, C Information Analysis Software, C Calculators

Registered

2012-05-28
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