Explanation of what CRC or cyclic redundancy check is: see wiki

The task of the project was to

1. create a basic CRC-32 implementation in C
2. create alternative/optimized versions
3. run a benchmark to compare all implementations.

All versions are required to accept input as the first argument and calculate a checksum for its content. An optional second argument can be used to specify a custom generator polynomial.

The first optimized version uses a look-up table to speed up the checksum calculation. (missing source, will add later)

A third implementation uses SIMD instructions in an attempt to speed up the creation of the LUT for custom generator polynomials.