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crc32 ?????

 
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KevinD
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PostPosted: Sat Apr 01, 2023 11:46 am    Post subject: crc32 ????? Reply with quote

Good evening, I don't understand well how the crc32 function works.
My RAX has a value of 00000000FFFFFF at the beginning.
On the next line it will look for the value of at address D0B1FF4D which is 0000803F0000000. After the execution my RAX has a value of 0000000096442BF2. I don't understand how it gets this value?



0001.jpg
 Description:
CRC32 fonction
 Filesize:  1 MB
 Viewed:  1046 Time(s)

0001.jpg


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ParkourPenguin
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PostPosted: Sat Apr 01, 2023 1:53 pm    Post subject: Reply with quote

TLDR: it's a bit of math that verifies if something has changed or not.

Intel documentation:
Quote:
Starting with an initial value in the first operand (destination operand), accumulates a CRC32 (polynomial 11EDC6F41H) value for the second operand (source operand) and stores the result in the destination operand.

More information:
https://en.wikipedia.org/wiki/Computation_of_cyclic_redundancy_checks#CRC-32_algorithm

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