well as u already said, the spec says it uses 'a standard CCITT32 CRC algorithm with a seed polynomial value of 0x04c11db7'
this is the implementation which confirms it: https://github.com/tianocore/edk2/blob/master/MdeModulePkg/Core/RuntimeDxe/Crc32.c after testing it it indeed produces CCITT32 results like this online generator: http://g6auc.me.uk/CRC32/index.html Thanks Michael On Tue, Aug 30, 2016 at 2:54 AM, valerij zaporogeci <vlrzpr...@gmail.com> wrote: > Hi, all. > Yet another dumb question from me. > UEFI specification has Crc32 calculation service and uses Crc32 in > several places. but it only humbly mentions in the note somewhere in > the description of System Table about what exact one it wants. Namely > it states that the polynomial seed is 04c11db7. And that's all. > My question is - does really the specification means the 33-bit polynomial > 104c11db7? And is the algorithm just a plain remainder calculation > without any additional pre/post processing of it? So that for example > Crc32 of the 4-byte sequence b16b00b5 would be > 8c1f0a7c? > Thank you. > _______________________________________________ > edk2-devel mailing list > edk2-devel@lists.01.org > https://lists.01.org/mailman/listinfo/edk2-devel > _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel
