title: CRC ECMA-182 reference
body: <p>I would like to cross check a C implementation of the CRC64 ECMA-182 algorithm.</p>
  
  <p>I tried a different C code snippet I found online and I tried two online CRC calculators but each of them returned different results.</p>
  
  <p>Is there some reference implementation or reference data that allows me to get a reliable reference checksum?</p>