io.github.novacrypto.bip39

Class SeedCalculator

java.lang.Object

io.github.novacrypto.bip39.SeedCalculator

public final class SeedCalculator
extends java.lang.Object

Contains function for generating seeds from a Mnemonic and Passphrase.

Constructor Summary

Constructors

Constructor and Description
SeedCalculator() Creates a seed calculator using SpongyCastlePBKDF2WithHmacSHA512 which is the most compatible.
SeedCalculator(PBKDF2WithHmacSHA512 hashAlgorithm)

Method Summary

Modifier and Type	Method and Description
byte[]	calculateSeed(java.lang.String mnemonic, java.lang.String passphrase) Calculate the seed given a mnemonic and corresponding passphrase.
SeedCalculatorByWordListLookUp	withWordsFromWordList(WordList wordList)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SeedCalculator

public SeedCalculator(PBKDF2WithHmacSHA512 hashAlgorithm)

SeedCalculator

public SeedCalculator()

Creates a seed calculator using SpongyCastlePBKDF2WithHmacSHA512 which is the most compatible. Use SeedCalculator(PBKDF2WithHmacSHA512) to supply another.

Method Detail

calculateSeed

public byte[] calculateSeed(java.lang.String mnemonic,
                            java.lang.String passphrase)

Calculate the seed given a mnemonic and corresponding passphrase. The phrase is not checked for validity here, for that use a MnemonicValidator.

Due to normalization, these need to be String, and not CharSequence, this is an open issue: https://github.com/NovaCrypto/BIP39/issues/7

If you have a list of words selected from a word list, you can use withWordsFromWordList(io.github.novacrypto.bip39.WordList) then SeedCalculatorByWordListLookUp.calculateSeed(java.util.Collection<? extends java.lang.CharSequence>, java.lang.String)

Parameters:

mnemonic - The memorable list of words

passphrase - An optional passphrase, use "" if not required

Returns:

a seed for HD wallet generation

withWordsFromWordList

public SeedCalculatorByWordListLookUp withWordsFromWordList(WordList wordList)