fix is_fubar key size check
fix is_fubar key size check

PeterMosmans/cipherscan,jvehent/cipherscan,jvehent/cipherscan,PeterMosmans/cipherscan,MikeDawg/cipherscan,MikeDawg/cipherscan,MikeDawg/cipherscan,PeterMosmans/cipherscan,jvehent/cipherscan