CRC RevEng

CRC RevEng: arbitrary-precision CRC calculator and algorithm finder

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About CRC RevEng

CRC RevEng is a portable, arbitrary-precision CRC calculator and algorithm finder. It calculates CRCs using any of the 102 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™ model of parametrised CRC algorithms.

CRC RevEng was first released on 5 January 2011 at It is a port and expansion of a Perl script,, released in 2007. This SourceForge project was created on 28 May 2012.

CRC RevEng is released under the terms of the GNU General Public License, version 3 and later (GPLv3+).


Latest version

The latest version of CRC RevEng is 1.5.2, released on 20 June 2017. The latest changes are:

[RISC OS logo] Enhanced Zip archive available for RISC OS. For other operating systems please view the latest releases.


Greg Cook, [email address] Last updated 1 February 2018

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