>> I was thinking that all the difference in the Tianocore impl. from the >> pure crc is appending 32 1's at the beginning of the (input) message >> and then negating the Crc itself in the end.
Thank you, Michael and Andrew for your help. I figured out what causes the difference. Apart from initializing crc with ffffffff at the beginning and negating the resulting crc at the end, the difference is that Tianocore impl. reverses bits in the byte sequence (of the input), thus bit 7 of every byte becomes bit 0 and bit 0 - bit 7. And also in the end, resulting Crc is also reverted bitwise (bit 31->0, 0->31). Not that I understood everything, but applying these inversions into the pure remainder calculation, gives matching with the Tianocore function results. _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
