Enum bip39::MnemonicType

pub enum MnemonicType {
    Words12,
    Words15,
    Words18,
    Words21,
    Words24,
}

Determines the number of words that will be present in a Mnemonic phrase

Also directly affects the amount of entropy that will be used to create a Mnemonic, and therefore the cryptographic strength of the HD wallet keys/addresses that can be derived from it using the Seed.

For example, a 12 word mnemonic phrase is essentially a friendly representation of a 128-bit key, while a 24 word mnemonic phrase is essentially a 256-bit key.

If you know you want a specific phrase length, you can use the enum variant directly, for example MnemonicType::Words12.

You can also get a MnemonicType that corresponds to one of the standard BIP39 key sizes by passing arbitrary usize values:

use bip39::{MnemonicType};

let mnemonic_type = MnemonicType::for_key_size(128).unwrap();

Variants

Words12

Words15

Words18

Words21

Words24

Implementations

impl MnemonicType

pub fn for_word_count(size: usize) -> Result<MnemonicType, Error>

Get a MnemonicType for a mnemonic phrase with a specific number of words

Specifying a word count not provided for by the BIP39 standard will return an Error of kind ErrorKind::InvalidWordLength.

Example

use bip39::{MnemonicType};

let mnemonic_type = MnemonicType::for_word_count(12).unwrap();

pub fn for_key_size(size: usize) -> Result<MnemonicType, Error>

Get a MnemonicType for a mnemonic phrase representing the given key size as bits

Specifying a key size not provided for by the BIP39 standard will return an Error of kind ErrorKind::InvalidKeysize.

Example

use bip39::{MnemonicType};

let mnemonic_type = MnemonicType::for_key_size(128).unwrap();

pub fn for_phrase(phrase: &str) -> Result<MnemonicType, Error>

Get a MnemonicType for an existing mnemonic phrase

This can be used when you need information about a mnemonic phrase based on the number of words, for example you can get the entropy value using MnemonicType::entropy_bits.

Specifying a phrase that does not match one of the standard BIP39 phrase lengths will return an Error of kind ErrorKind::InvalidWordLength. The phrase will not be validated in any other way.

Example

use bip39::{MnemonicType};

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

let mnemonic_type = MnemonicType::for_phrase(test_mnemonic).unwrap();

let entropy_bits = mnemonic_type.entropy_bits();

pub fn total_bits(&self) -> usize

Return the number of entropy+checksum bits

Example

use bip39::{MnemonicType};

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

let mnemonic_type = MnemonicType::for_phrase(test_mnemonic).unwrap();

let total_bits = mnemonic_type.total_bits();

pub fn entropy_bits(&self) -> usize

Return the number of entropy bits

Example

use bip39::{MnemonicType};

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

let mnemonic_type = MnemonicType::for_phrase(test_mnemonic).unwrap();

let entropy_bits = mnemonic_type.entropy_bits();

pub fn checksum_bits(&self) -> u8

Return the number of checksum bits

Example

use bip39::{MnemonicType};

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

let mnemonic_type = MnemonicType::for_phrase(test_mnemonic).unwrap();

let checksum_bits = mnemonic_type.checksum_bits();

pub fn word_count(&self) -> usize

Return the number of words

Example

use bip39::{MnemonicType};

let mnemonic_type = MnemonicType::Words12;

let word_count = mnemonic_type.word_count();

Trait Implementations

impl Clone for MnemonicType

fn clone(&self) -> MnemonicType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for MnemonicType

impl Debug for MnemonicType

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

Formats the value using the given formatter.

impl Default for MnemonicType

fn default() -> MnemonicType

Returns the “default value” for a type.

impl Display for MnemonicType

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

Formats the value using the given formatter.