Hierarchical Deterministic Bitcoin Wallets

Compliant implementation of the BIP-32 specification for Hierarchical Deterministic Wallets.

Usage

Using maven:

mvn package

Examples

Importing a Base58Check serialized wallet:

String base58PrivateKey = "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi";
ExtendedKeyPair extendedPrivateKey = ExtendedKeyPair.parseBase58Check(base58PrivateKey);

Serializing an extended key:

String base58PrivateKey = "xprv9s21ZrQH143K3QTDL4LXw2F7HEK3wJUD2nW2nRk4stbPy6cq3jPPqjiChkVvvNKmPGJxWUtg6LnF5kejMRNNU3TGtRBeJgk33yuGBxrMPHi";
ExtendedKeyPair extendedPrivateKey = ExtendedKeyPair.parseBase58Check(base58PrivateKey);

String serializedPublicKey = extendedPrivateKey.serializePub();
String serializedPrivateKey = extendedPrivateKey.serializePriv();

Generating ancestors of an extended key:

ExtendedKeyPair masterKey = Bip32.generateMasterKey(new byte[]{0, 0, 0, 0});
ExtendedKeyPair childKey = masterKey.generate("m/0/2147483647H/1");

Notes

I have included Bitcoinj out of laziness. To avoid pulling in Bitcoinj, I would need to implement Base58 in this library.