novacrypto / bip39 Goto Github PK

We already do this, if the client has the words chosen from the dictionary and can provide the indexes into the dictionary, it would save client combining, then library normalizing, splitting to a list, and finding the indexes. Plus it would avoid the client handling WordNotFoundException and UnexpectedWhiteSpaceException.

As seen in other projects, a search and replace could accidentally modify a word in a word list.

https://github.com/litecoin-foundation/loafwallet-android/issues/33

On Android < 26

Caused by: java.lang.RuntimeException: java.security.NoSuchAlgorithmException: SecretKeyFactory PBKDF2WithHmacSHA512 implementation not found
                                                                                at io.github.novacrypto.toruntime.CheckedExceptionToRuntime.toRuntime(CheckedExceptionToRuntime.java:48)
                                                                                at io.github.novacrypto.bip39.SeedCalculator.getPbkdf2WithHmacSHA512(SeedCalculator.java:91)
                                                                                at io.github.novacrypto.bip39.SeedCalculator.<init>(SeedCalculator.java:40)

See: https://developer.android.com/reference/javax/crypto/SecretKeyFactory.html

 public byte[] calculateSeed(String mnemonic, String passphrase) {

This should be able to take CharSequence but the normalizer is insisting we have String input.

May throw word not found, that would actually be found if normalized.

when i use
f=fc534ee49d7d44f7942996f13ba11372f939e5fcc02dd89eb4fdd23e4dcdb134

 new MnemonicGenerator(wordList)
                .createMnemonic(f, sb::append);

i got "wisdom omit rice depend stairs knock expose crazy van tackle dynamic tourist near very vessel aisle sudden volcano disorder piece tooth traffic shadow mother" total 24 words,

i wannn 12 word. like METAMASK

thank you

What's wrong with this mnemonic generated by Electrum LTC 2.8.3.5:

despair neck garden cabbage one bless help lamp marriage can mushroom moon

https://iancoleman.github.io/bip39/ doesn't like it.

Interested which side of the fence this library falls on.

Currently, only English and Japanese are tested and supported.

Possibly allow a relaxation of this rule option.

I tried the example "Using a StringBuilder" and got "Exception in thread "main" java.lang.NoClassDefFoundError: io/github/novacrypto/hashing/Sha256".
MnemonicGenerator has an import of io.github.novacrypto.hashing.Sha256, but there is no such package as io.github.novacrypto.hashing.

Hello, I am very happy to use your powerful encryption library, but when I was testing the demo example on this page (https://iancoleman.io/bip39/#english), I encountered a problem: From Derived Addresses Title，
In the Table tab , how to generate different addresses, public keys, and private keys according to different Derived Paths. When I use the BIP39 library, I don’t know how to implement it. cloud you give me a java demo? Because the page is implemented through the javascript lib, but how to implement the java BIP39 library, I read all the unit tests and don’t know how to write the code, so I need your help. thanks！

link:
https://github.com/NovaCrypto/BIP39
https://iancoleman.io/bip39/#english

How to get private key in the project?

Starting from May 1, 2021 JCenter will stop working. Can you please publish the library to MavenCentral?

Possible alternatives
JitPack
GitHub Packages

The method for splitting the string and looking up the words can be simplified.

Currently, it causes a word not found "" exception, which is not very helpful.

JDK1.8.0_121
Intellij IDEA
Without Andriod development environment
class io.github.novacrypto.hashing.Sha256$1 cannot access its superinterface io.github.novacrypto.toruntime.CheckedExceptionToRuntime$Func at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:763) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) at java.net.URLClassLoader.access$100(URLClassLoader.java:73) at java.net.URLClassLoader$1.run(URLClassLoader.java:368) at java.net.URLClassLoader$1.run(URLClassLoader.java:362) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:361) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at io.github.novacrypto.hashing.Sha256.sha256(Sha256.java:57) at io.github.novacrypto.hashing.Sha256.sha256(Sha256.java:40) at io.github.novacrypto.hashing.Sha256.sha256(Sha256.java:36) at io.github.novacrypto.bip39.MnemonicGenerator.firstByteOfSha256(MnemonicGenerator.java:120) at io.github.novacrypto.bip39.MnemonicGenerator.wordIndexes(MnemonicGenerator.java:104) at io.github.novacrypto.bip39.MnemonicGenerator.createMnemonic(MnemonicGenerator.java:81)

Quoting BIP 39:

HMAC-SHA512 is used as the pseudo-random function.

Quoting SeedCalculator.java:38:

    private final PBKDF2WithHmacSHA256 hashAlgorithm;

    public SeedCalculator(PBKDF2WithHmacSHA256 hashAlgorithm) {
        this.hashAlgorithm = hashAlgorithm;
}

On a two-minute glance through the code, I had an understandable reaction. Then, I reached for grep and found these:

JavaxPBKDF2WithHmacSHA256.java:36:

public enum JavaxPBKDF2WithHmacSHA256 implements PBKDF2WithHmacSHA256 {
    INSTANCE;

    private SecretKeyFactory skf = getPbkdf2WithHmacSHA512();

    @Override
    public byte[] hash(char[] chars, byte[] salt) {
        final PBEKeySpec spec = new PBEKeySpec(chars, salt, 2048, 512);

SpongyCastlePBKDF2WithHmacSHA256.java:32:

public enum SpongyCastlePBKDF2WithHmacSHA256 implements PBKDF2WithHmacSHA256 {
    INSTANCE;

    @Override
    public byte[] hash(char[] chars, byte[] salt) {
        PKCS5S2ParametersGenerator generator = new PKCS5S2ParametersGenerator(new SHA512Digest());

I am still not sure how it all fits together. But I suggest it may be kinder to code reviewers to not misidentify the PRF in variable names. Or perhaps you wish to test whether readers be paying attention? [g]