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Function CRC32Hash

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Calculates CRC-32 checksum.

 

Unit

EHash

 

Syntax

 

Code (Delphi)

function CRC32Hash(

const AData: Pointer;

const ADataSize: Cardinal

): TCRC32Hash; overload;

 

function CRC32Hash(

const AData: RawByteString

): TCRC32Hash; overload;

 

Parameters

AData [in]

A data to calculate checksum.

 

ADataSize [in]

Size of AData in bytes.

 

Return value

CRC-32 checksum of the specified AData.

 

Remarks

A cyclic redundancy check (CRC) is an error-detecting code commonly used in digital networks and storage devices to detect accidental changes to raw data. CRCs are based on the theory of cyclic error-correcting codes. CRCs are popular because they are simple to implement in binary hardware, easy to analyze mathematically, and particularly good at detecting common errors caused by noise in transmission channels.

 

Important!

Unlike cryptographic hash functions (like MD5 or SHA1), CRC is an easily reversible function, which makes it unsuitable for use in digital signatures.

 

Numerous varieties of cyclic redundancy checks have been incorporated into technical standards. CRC32Hash function uses CRC-32-IEEE 802.3 algorithm. Polynomial is $EDB88320. Starting value is $FFFFFFFF. For example, this implementation matches PHP's implementation of CRC-32.

 

See also




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Last edited: 2018-11-26
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