bip39

README

go-bip39

A golang implementation of the BIP0039 spec for mnemonic seeds

Example

package main

import (
  "github.com/tyler-smith/go-bip39"
  "github.com/tyler-smith/go-bip32"
  "fmt"
)

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)
}

Credits

Wordlists are from the bip39 spec.

Test vectors are from the standard Python BIP0039 implementation from the Trezor team: https://github.com/trezor/python-mnemonic

Documentation

Index

• Variables
• func IsMnemonicValid(mnemonic string) bool
• func MnemonicToByteArray(mnemonic string) ([]byte, error)
• func NewEntropy(bitSize int) ([]byte, error)
• func NewMnemonic(entropy []byte) (string, error)
• func NewSeed(mnemonic string, password string) []byte
• func NewSeedWithErrorChecking(mnemonic string, password string) ([]byte, error)
• func SetWordList(list []string)

Variables

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

	// 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")
)

Functions

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) ([]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.

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.

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.

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

func SetWordList(list []string)

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