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Published: Apr 7, 2016 License: MIT, MIT Imports: 12 Imported by: 0


UUID package for Go language

Build Status GoDoc

This package provides pure Go implementation of Universally Unique Identifier (UUID). Supported both creation and parsing of UUIDs.

With 100% test coverage and benchmarks out of box.

Supported versions:

  • Version 1, based on timestamp and MAC address (RFC 4122)
  • Version 2, based on timestamp, MAC address and POSIX UID/GID (DCE 1.1)
  • Version 3, based on MD5 hashing (RFC 4122)
  • Version 4, based on random numbers (RFC 4122)
  • Version 5, based on SHA-1 hashing (RFC 4122)


Use the go command:

$ go get github.com/satori/go.uuid


UUID package requires any stable version of Go Programming Language.

It is tested against following versions of Go: 1.0-1.4


package main

import (

func main() {
	// Creating UUID Version 4
	u1 := uuid.NewV4()
	fmt.Printf("UUIDv4: %s\n", u1)

	// Parsing UUID from string input
	u2, err := uuid.FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
	if err != nil {
		fmt.Printf("Something gone wrong: %s", err)
	fmt.Printf("Successfully parsed: %s", u2)


Documentation is hosted at GoDoc project.

Copyright (C) 2013-2015 by Maxim Bublis b@codemonkey.ru.

UUID package released under MIT License. See LICENSE for details.



Package uuid provides implementation of Universally Unique Identifier (UUID). Supported versions are 1, 3, 4 and 5 (as specified in RFC 4122) and version 2 (as specified in DCE 1.1).



View Source
const (
	VariantNCS = iota

UUID layout variants.

View Source
const (
	DomainPerson = iota

UUID DCE domains.


View Source
var (
	NamespaceDNS, _  = FromString("6ba7b810-9dad-11d1-80b4-00c04fd430c8")
	NamespaceURL, _  = FromString("6ba7b811-9dad-11d1-80b4-00c04fd430c8")
	NamespaceOID, _  = FromString("6ba7b812-9dad-11d1-80b4-00c04fd430c8")
	NamespaceX500, _ = FromString("6ba7b814-9dad-11d1-80b4-00c04fd430c8")

Predefined namespace UUIDs.

View Source
var Nil = UUID{}

The nil UUID is special form of UUID that is specified to have all 128 bits set to zero.


func Equal

func Equal(u1 UUID, u2 UUID) bool

Equal returns true if u1 and u2 equals, otherwise returns false.


type UUID

type UUID [16]byte

UUID representation compliant with specification described in RFC 4122.

func And

func And(u1 UUID, u2 UUID) UUID

And returns result of binary AND of two UUIDs.

func FromBytes

func FromBytes(input []byte) (u UUID, err error)

FromBytes returns UUID converted from raw byte slice input. It will return error if the slice isn't 16 bytes long.

func FromString

func FromString(input string) (u UUID, err error)

FromString returns UUID parsed from string input. Input is expected in a form accepted by UnmarshalText.

func NewV1

func NewV1() UUID

NewV1 returns UUID based on current timestamp and MAC address.

func NewV2

func NewV2(domain byte) UUID

NewV2 returns DCE Security UUID based on POSIX UID/GID.

func NewV3

func NewV3(ns UUID, name string) UUID

NewV3 returns UUID based on MD5 hash of namespace UUID and name.

func NewV4

func NewV4() UUID

NewV4 returns random generated UUID.

func NewV5

func NewV5(ns UUID, name string) UUID

NewV5 returns UUID based on SHA-1 hash of namespace UUID and name.

func Or

func Or(u1 UUID, u2 UUID) UUID

Or returns result of binary OR of two UUIDs.

func (UUID) Bytes

func (u UUID) Bytes() []byte

Bytes returns bytes slice representation of UUID.

func (UUID) MarshalBinary

func (u UUID) MarshalBinary() (data []byte, err error)

MarshalBinary implements the encoding.BinaryMarshaler interface.

func (UUID) MarshalText

func (u UUID) MarshalText() (text []byte, err error)

MarshalText implements the encoding.TextMarshaler interface. The encoding is the same as returned by String.

func (*UUID) Scan

func (u *UUID) Scan(src interface{}) error

Scan implements the sql.Scanner interface. A 16-byte slice is handled by UnmarshalBinary, while a longer byte slice or a string is handled by UnmarshalText.

func (*UUID) SetVariant

func (u *UUID) SetVariant()

SetVariant sets variant bits as described in RFC 4122.

func (*UUID) SetVersion

func (u *UUID) SetVersion(v byte)

SetVersion sets version bits.

func (UUID) String

func (u UUID) String() string

Returns canonical string representation of UUID: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx.

func (*UUID) UnmarshalBinary

func (u *UUID) UnmarshalBinary(data []byte) (err error)

UnmarshalBinary implements the encoding.BinaryUnmarshaler interface. It will return error if the slice isn't 16 bytes long.

func (*UUID) UnmarshalText

func (u *UUID) UnmarshalText(text []byte) (err error)

UnmarshalText implements the encoding.TextUnmarshaler interface. Following formats are supported: "6ba7b810-9dad-11d1-80b4-00c04fd430c8", "{6ba7b810-9dad-11d1-80b4-00c04fd430c8}", "urn:uuid:6ba7b810-9dad-11d1-80b4-00c04fd430c8"

func (UUID) Variant

func (u UUID) Variant() uint

Variant returns UUID layout variant.

func (UUID) Version

func (u UUID) Version() uint

Version returns algorithm version used to generate UUID.

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