Class ChildNumber

  • All Implemented Interfaces:

    public class ChildNumber
    extends java.lang.Object
    implements java.lang.Comparable<ChildNumber>

    This is just a wrapper for the i (child number) as per BIP 32 with a boolean getter for the most significant bit and a getter for the actual 0-based child number. A List of these forms a path through a DeterministicHierarchy. This class is immutable.

    • Field Detail


        public static final int HARDENED_BIT
        The bit that's set in the child number to indicate whether this key is "hardened". Given a hardened key, it is not possible to derive a child public key if you know only the hardened public key. With a non-hardened key this is possible, so you can derive trees of public keys given only a public parent, but the downside is that it's possible to leak private keys if you disclose a parent public key and a child private key (elliptic curve maths allows you to work upwards).
        See Also:
        Constant Field Values

        public static final ChildNumber ZERO_HARDENED

        public static final ChildNumber ONE_HARDENED
      • PURPOSE_BIP44

        public static final ChildNumber PURPOSE_BIP44
      • PURPOSE_BIP49

        public static final ChildNumber PURPOSE_BIP49
      • PURPOSE_BIP84

        public static final ChildNumber PURPOSE_BIP84
      • PURPOSE_BIP86

        public static final ChildNumber PURPOSE_BIP86

        public static final ChildNumber COINTYPE_BTC

        public static final ChildNumber COINTYPE_TBTC

        public static final ChildNumber CHANGE_RECEIVING

        public static final ChildNumber CHANGE_CHANGE
    • Constructor Detail

      • ChildNumber

        public ChildNumber​(int childNumber,
                           boolean isHardened)
      • ChildNumber

        public ChildNumber​(int i)
    • Method Detail

      • getI

        public int getI()
        Returns the uint32 encoded form of the path element, including the most significant bit.
      • i

        public int i()
        Returns the uint32 encoded form of the path element, including the most significant bit.
      • isHardened

        public boolean isHardened()
      • num

        public int num()
        Returns the child number without the hardening bit set (i.e. index in that part of the tree).
      • toString

        public java.lang.String toString()
        toString in class java.lang.Object
      • equals

        public boolean equals​(java.lang.Object o)
        equals in class java.lang.Object
      • hashCode

        public int hashCode()
        hashCode in class java.lang.Object
      • compareTo

        public int compareTo​(ChildNumber other)
        Specified by:
        compareTo in interface java.lang.Comparable<ChildNumber>