crc32c · shipping · also Castagnoli CRC, CRC32C

CRC-32C

CRC-32C is a 32-bit cyclic redundancy check using the Castagnoli generator polynomial.

Related Observatory article: CRC-32C on hesela.com

The full polynomial representation is 0x11EDC6F41, including its leading degree-32 term. iSCSI specifies this generator and publishes digest test vectors; their serialized bytes must not be confused with a checksum API's integer display. [1] A constructed 18-bit change spanning 33 processing bits preserves the CRC-32C value in Hesela's experiment. A separate 36-bit change over a 65-bit span preserves both CRC-32C and IEEE CRC-32; these are deterministic counterexamples, not measured collision frequencies. [2]

Relations

related

Cyclic redundancy check, Checksum, iSCSI, CRC burst error, Hamming distance

Limitations

• CRC-32C and IEEE CRC-32 are different functions, not interchangeable names for a 32-bit checksum. [1, 2]

Citations

1. Chadalapaka et al. RFC 7143: iSCSI consolidated specification, section 13.1 and Appendix A.4 (2014) (accessed 2026-10-18)
2. Hesela: CRC polynomials, constructed error patterns and exact small-code enumeration (accessed 2026-10-18)

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