Struct Mnemonic

pub struct Mnemonic { /* private fields */ }

The primary type in this crate, most tasks require creating or using one.

To create a new Mnemonic from a randomly generated key, call Mnemonic::new().

To get a Mnemonic instance for an existing mnemonic phrase, including those generated by other software or hardware wallets, use Mnemonic::from_phrase().

You can get the HD wallet Seed from a Mnemonic by calling Seed::new(). From there you can either get the raw byte value with Seed::as_bytes(), or the hex representation using Rust formatting: format!("{:X}", seed).

You can also get the original entropy value back from a Mnemonic with Mnemonic::entropy(), but beware that the entropy value is not the same thing as an HD wallet seed, and should never be used that way.

Mnemonic implements [Zeroize][Zeroize], so it’s bytes will be zeroed when it’s dropped.

Implementations

impl Mnemonic

pub fn new(mtype: MnemonicType, lang: Language) -> Mnemonic

Generates a new Mnemonic

Use Mnemonic::phrase() to get an str slice of the generated phrase.

Example

use bip39::{Mnemonic, MnemonicType, Language};

let mnemonic = Mnemonic::new(MnemonicType::Words12, Language::English);
let phrase = mnemonic.phrase();

println!("phrase: {}", phrase);

assert_eq!(phrase.split(' ').count(), 12);

pub fn from_entropy( entropy: &[u8], lang: Language, ) -> Result<Mnemonic, ErrorKind>

Create a Mnemonic from pre-generated entropy

Example

use bip39::{Mnemonic, MnemonicType, Language};

let entropy = &[0x33, 0xE4, 0x6B, 0xB1, 0x3A, 0x74, 0x6E, 0xA4, 0x1C, 0xDD, 0xE4, 0x5C, 0x90, 0x84, 0x6A, 0x79];
let mnemonic = Mnemonic::from_entropy(entropy, Language::English).unwrap();

assert_eq!("crop cash unable insane eight faith inflict route frame loud box vibrant", mnemonic.phrase());
assert_eq!("33E46BB13A746EA41CDDE45C90846A79", format!("{:X}", mnemonic));

pub fn from_phrase(phrase: &str, lang: Language) -> Result<Mnemonic, ErrorKind>

Create a Mnemonic from an existing mnemonic phrase

The phrase supplied will be checked for word length and validated according to the checksum specified in BIP0039

Example

use bip39::{Mnemonic, Language};

let phrase = "park remain person kitchen mule spell knee armed position rail grid ankle";
let mnemonic = Mnemonic::from_phrase(phrase, Language::English).unwrap();

assert_eq!(phrase, mnemonic.phrase());

pub fn validate(phrase: &str, lang: Language) -> Result<(), ErrorKind>

Validate a mnemonic phrase

The phrase supplied will be checked for word length and validated according to the checksum specified in BIP0039.

Example

use bip39::{Mnemonic, Language};

let test_mnemonic = "park remain person kitchen mule spell knee armed position rail grid ankle";

assert!(Mnemonic::validate(test_mnemonic, Language::English).is_ok());

pub fn phrase(&self) -> &str

Get the mnemonic phrase as a string reference.

pub fn into_phrase(self) -> String

Consume the Mnemonic and return the phrase as a String.

pub fn entropy(&self) -> &[u8]

Get the original entropy value of the mnemonic phrase as a slice.

Example

use bip39::{Mnemonic, Language};

let phrase = "park remain person kitchen mule spell knee armed position rail grid ankle";

let mnemonic = Mnemonic::from_phrase(phrase, Language::English).unwrap();

let entropy: &[u8] = mnemonic.entropy();

Note: You shouldn’t use the generated entropy as secrets, for that generate a new Seed from the Mnemonic.

pub fn language(&self) -> Language

Get the Language

Trait Implementations

impl AsRef<str> for Mnemonic

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for Mnemonic

fn clone(&self) -> Mnemonic

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Mnemonic

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Display for Mnemonic

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl LowerHex for Mnemonic

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl UpperHex for Mnemonic

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.