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crc64

package standard library
go1.25.1 Latest Latest
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 Go to latest Published: Sep 3, 2025 License: BSD-3-Clause Imports: 4 Imported by: 1,824

Documentation

Overview

Package crc64 implements the 64-bit cyclic redundancy check, or CRC-64, checksum. See https://en.wikipedia.org/wiki/Cyclic_redundancy_check for information.

Index

Constants

View Source 
const (
	// The ISO polynomial, defined in ISO 3309 and used in HDLC.
	ISO = 0xD800000000000000

	// The ECMA polynomial, defined in ECMA 182.
	ECMA = 0xC96C5795D7870F42
)

Predefined polynomials.

View Source 
const Size = 8

The size of a CRC-64 checksum in bytes.

Variables

This section is empty.

Functions

func Checksum 

func Checksum(data []byte, tab *Table) uint64

Checksum returns the CRC-64 checksum of data using the polynomial represented by the Table.

func New 

func New(tab *Table) hash.Hash64

New creates a new hash.Hash64 computing the CRC-64 checksum using the polynomial represented by the Table. Its Sum method will lay the value out in big-endian byte order. The returned Hash64 also implements encoding.BinaryMarshaler and encoding.BinaryUnmarshaler to marshal and unmarshal the internal state of the hash.

func Update 

func Update(crc uint64, tab *Table, p []byte) uint64

Update returns the result of adding the bytes in p to the crc.

Types

type Table 

type Table [256]uint64

Table is a 256-word table representing the polynomial for efficient processing.

func MakeTable 

func MakeTable(poly uint64) *Table

MakeTable returns a Table constructed from the specified polynomial. The contents of this Table must not be modified.

Source Files

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