Hi, is there anybody out there who can confirm the 'Check' and 'LCheck' values of following non-reflected CRC32 algorithms found in http://homepages.tesco.net/~rainstorm/crc-catalogue.htm Name : "CRC-32/POSIX" Alias : "CKSUM" Width : 32 Poly : 04C11DB7 Init : 00000000 RefIn : False RefOut : False XorOut : FFFFFFFF Check : 765E7680 LCheck : 377A6011 Name : "XFER" Width : 32 Poly : 000000AF Init : 00000000 RefIn : False RefOut : False XorOut : 00000000 Check : BD0BE338 My values are: Name : "CRC-32/POSIX" Alias : "CKSUM" Width : 32 Poly : 04C11DB7 Init : 00000000 RefIn : False RefOut : False XorOut : FFFFFFFF Check : 0xAB49C52D LCheck : 0x90B466B6 Name : "XFER" Width : 32 Poly : 000000AF Init : 00000000 RefIn : False RefOut : False XorOut : 00000000 Check : 0x37F54E84 Thanx for help Hartmut