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CRC-32 - Just Solve the File Format Problem

CRC-32

From Just Solve the File Format Problem
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File Format
Name CRC-32
Ontology

CRC-32 is a family of 32-bit hash functions used to detect accidental data corruption.

The term CRC-32 by itself usually means the CRC-32/ISO-HDLC (IEEE) algorithm.

Refer to the CRC article for more information.

Contents

Specific algorithms

Selected CRC-32 algorithms are listed here. The names are from the CRC RevEng Catalogue.

CRC-32/ISO-HDLC

Also referred to as ISO 3309, ITU-T V.42, CRC-32-IEEE, and many other names.

The CRC of ASCII "123456789" is 0xcbf43926.

Examples of formats that use CRC-32/ISO-HDLC: ZIP, PNG, Gzip, ARJ.

CRC-32/JAMCRC

Equivalent to CRC-32/ISO-HDLC, but with the final CRC's bits inverted (or, rather, not inverted -- ISO-HDLC is the one that inverts the bits).

The CRC of ASCII "123456789" is 0x340bc6d9.

Examples of formats that use CRC-32/JAMCRC: EDI Install archive and Eschalon Setup archive, Brik.

CRC-32/CKSUM

The default algorithm of the traditional Unix/POSIX "cksum" utility. Note that the utility uses a high-level algorithm that preprocesses the input data.

The (high-level) CRC of ASCII "123456789" is 0x377a6011.

Others

Other members of the CRC-32 family include CRC-32Q, CRC-32C (Castagnoli), and CRC-32K (Koopman).

Links

See also CRC#Links.

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