package module
Version: v1.0.2 Latest Latest

This package is not in the latest version of its module.

Go to latest
Published: Aug 8, 2019 License: MIT Imports: 10 Imported by: 3



Build Status license Documentation Go Report Card GitHub issues

A golang implementation of the BIP0039 spec for mnemonic seeds


package main

import (

func main(){
  // Generate a mnemonic for memorization or user-friendly seeds
  entropy, _ := bip39.NewEntropy(256)
  mnemonic, _ := bip39.NewMnemonic(entropy)

  // Generate a Bip32 HD wallet for the mnemonic and a user supplied password
  seed := bip39.NewSeed(mnemonic, "Secret Passphrase")

  masterKey, _ := bip32.NewMasterKey(seed)
  publicKey := masterKey.PublicKey()

  // Display mnemonic and keys
  fmt.Println("Mnemonic: ", mnemonic)
  fmt.Println("Master private key: ", masterKey)
  fmt.Println("Master public key: ", publicKey)


Wordlists are from the bip39 spec.

Test vectors are from the standard Python BIP0039 implementation from the Trezor team:



Package bip39 is the Golang implementation of the BIP39 spec.

The official BIP39 spec can be found at




This section is empty.


View Source
var (
	// ErrInvalidMnemonic is returned when trying to use a malformed mnemonic.
	ErrInvalidMnemonic = errors.New("Invalid mnenomic")

	// ErrEntropyLengthInvalid is returned when trying to use an entropy set with
	// an invalid size.
	ErrEntropyLengthInvalid = errors.New("Entropy length must be [128, 256] and a multiple of 32")

	// ErrValidatedSeedLengthMismatch is returned when a validated seed is not the
	// same size as the given seed. This should never happen is present only as a
	// sanity assertion.
	ErrValidatedSeedLengthMismatch = errors.New("Seed length does not match validated seed length")

	// ErrChecksumIncorrect is returned when entropy has the incorrect checksum.
	ErrChecksumIncorrect = errors.New("Checksum incorrect")


func EntropyFromMnemonic added in v1.0.2

func EntropyFromMnemonic(mnemonic string) ([]byte, error)

EntropyFromMnemonic takes a mnemonic generated by this library, and returns the input entropy used to generate the given mnemonic. An error is returned if the given mnemonic is invalid.

func GetWordIndex added in v1.0.2

func GetWordIndex(word string) (int, bool)

GetWordIndex gets word index in wordMap.

func GetWordList added in v1.0.2

func GetWordList() []string

GetWordList gets the list of words to use for mnemonics.

func IsMnemonicValid

func IsMnemonicValid(mnemonic string) bool

IsMnemonicValid attempts to verify that the provided mnemonic is valid. Validity is determined by both the number of words being appropriate, and that all the words in the mnemonic are present in the word list.

func MnemonicToByteArray

func MnemonicToByteArray(mnemonic string, raw ...bool) ([]byte, error)

MnemonicToByteArray takes a mnemonic string and turns it into a byte array suitable for creating another mnemonic. An error is returned if the mnemonic is invalid.

func NewEntropy

func NewEntropy(bitSize int) ([]byte, error)

NewEntropy will create random entropy bytes so long as the requested size bitSize is an appropriate size.

bitSize has to be a multiple 32 and be within the inclusive range of {128, 256}

func NewMnemonic

func NewMnemonic(entropy []byte) (string, error)

NewMnemonic will return a string consisting of the mnemonic words for the given entropy. If the provide entropy is invalid, an error will be returned.

// the entropy can be any byte slice, generated how pleased,
// as long its bit size is a multiple of 32 and is within
// the inclusive range of {128,256}
entropy, err := hex.DecodeString("066dca1a2bb7e8a1db2832148ce9933eea0f3ac9548d793112d9a95c9407efad")
if err != nil {

// generate a mnemomic
mnemomic, err := bip39.NewMnemonic(entropy)
if err != nil {


all hour make first leader extend hole alien behind guard gospel lava path output census museum junior mass reopen famous sing advance salt reform

func NewSeed

func NewSeed(mnemonic string, password string) []byte

NewSeed creates a hashed seed output given a provided string and password. No checking is performed to validate that the string provided is a valid mnemonic.

seed := bip39.NewSeed("all hour make first leader extend hole alien behind guard gospel lava path output census museum junior mass reopen famous sing advance salt reform", "TREZOR")


func NewSeedWithErrorChecking

func NewSeedWithErrorChecking(mnemonic string, password string) ([]byte, error)

NewSeedWithErrorChecking creates a hashed seed output given the mnemonic string and a password. An error is returned if the mnemonic is not convertible to a byte array.

func SetWordList added in v0.4.0

func SetWordList(list []string)

SetWordList sets the list of words to use for mnemonics. Currently the list that is set is used package-wide.


This section is empty.

Source Files


Path Synopsis

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL