hash - CRC32 vs CRC32C? -

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What is the difference between CRC 32 and CRC 32C? I know CRC 32 for a long time, but today the CRC 32C has heard. Are they basically the same method (ie both results in the same hash for the given data)?

CRC found in zip 32 and many other places uses polynomial 0x04C11DB7; The mentioned form 0xEDB88320 is perhaps better known, which is often found in very low-endian implementations.

CRC 32C uses a separate polynomial (0x1EDC6F41, reverse 0x82F63B78), but otherwise the computation is the same. The results are different, naturally it is also known as the Castagonoli CRC 32 and is found most clearly in the new Intel CPU, which can calculate a full 32-bit CRC step in 3 cycles. This is the reason why CRC 32C is becoming more popular because it allows advanced execution, despite a delay of three cycles, effectively implementing a 32-bit word per cycle (processing 3 streams of data in parallel And using linear algebra to combine the results).


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