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# Package crc64

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## Constants

Predefined polynomials.

const (
ISO = 0xD800000000000000
ECMA = 0xC96C5795D7870F42
)

The size of a CRC-64 checksum in bytes.

const Size = 8

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

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

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.

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

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

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

type Table [256]uint64

func MakeTable(poly uint64) *Table

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