SlackBuildsOrg/misc/par2cmdline

par2cmdline (Commandline implementation of PARv2.0 specification)

par2cmdline is a GPL-licensed commandline tool for creating and
using PAR2 parity sets to detect damage in files and repair them if
necessary. The program uses Reed Solomon Coding to perform its error
correction. A useful program for checking and ensuring the integrity
of binaries retrieved from usenet for instance.