nxt.crypto

Class KeyDerivation.Bip32Node

java.lang.Object

nxt.crypto.KeyDerivation.Bip32Node

Enclosing class:

KeyDerivation

public static class KeyDerivation.Bip32Node
extends java.lang.Object

Represents a node in the Bip32 derivation tree. Use this node to: Obtain the Curve25519 private/public key pair for signing and encryption Derive child nodes with both private and public data Derive child nodes with only public data Security considerations: Given a master public key and chain code of a non-hardened parent node and any child private key, anyone can easily reproduce the parent node private key and all child private keys. Therefore maintain the pair master public key + chain code private

Constructor Summary

Constructors

Constructor and Description
Bip32Node(byte[] privateKeyLeft, byte[] privateKeyRight, byte[] masterPublicKey, byte[] chainCode, byte[] masterPublicKeyY)

Method Summary

Modifier and Type	Method and Description
boolean	equals(java.lang.Object o)
byte[]	getChainCode()
byte[]	getMasterPublicKey()
byte[]	getPrivateKeyLeft()
byte[]	getPrivateKeyRight()
byte[]	getPublicKey()
byte[]	getSerializedMasterPublicKey()
int	hashCode()
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Constructor Detail

Bip32Node

public Bip32Node(byte[] privateKeyLeft,
                 byte[] privateKeyRight,
                 byte[] masterPublicKey,
                 byte[] chainCode,
                 byte[] masterPublicKeyY)

Method Detail

getPrivateKeyLeft

public byte[] getPrivateKeyLeft()

Returns:

the ed25519/curve25519 private key associated with the node as used for signing and encryption

getPrivateKeyRight

public byte[] getPrivateKeyRight()

Returns:

the right side of the key is used for hardened derivation of child nodes

getMasterPublicKey

public byte[] getMasterPublicKey()

Returns:

the ed25519 public key used only for non-hardened child key derivation

getSerializedMasterPublicKey

public byte[] getSerializedMasterPublicKey()

Returns:

the 68 bytes combined master public key + chain code + CRC32 checksum

getChainCode

public byte[] getChainCode()

Returns:

the chain code is additional entropy needed to prevent someone just holding the private/public key pair from deriving more child nodes

getPublicKey

public byte[] getPublicKey()

Returns:

the real Curve25519 public key used for signing and encryption

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object