Class EdECPoint

java.lang.Object
java.security.spec.EdECPoint
public final class EdECPoint extends Object
An elliptic curve point used to specify keys as defined by RFC 8032: Edwards-Curve Digital Signature Algorithm (EdDSA). These points are distinct from the points represented by ECPoint, and they are intended for use with algorithms based on RFC 8032 such as the EdDSA Signature algorithm.

An EdEC point is specified by its y-coordinate value and a boolean that indicates whether the x-coordinate is odd. The y-coordinate is an element of the field of integers modulo some value p that is determined by the algorithm parameters. This field element is represented by a BigInteger, and implementations that consume objects of this class may reject integer values which are not in the range [0, p).

Since:
15
External Specifications

  • Constructor Summary

    Constructors
    Constructor
    Description
    EdECPoint(boolean xOdd, BigInteger y)
    Construct an EdECPoint.

  • Method Summary

    Modifier and Type
    Method
    Description
    BigInteger
    getY()
    Get the y-coordinate of the point.
    boolean
    isXOdd()
    Get whether the x-coordinate of the point is odd.

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Constructor Details

    • EdECPoint

      public EdECPoint(boolean xOdd, BigInteger y)
      Construct an EdECPoint.
      Parameters:
      xOdd - whether the x-coordinate is odd.
      y - the y-coordinate, represented using a BigInteger.
      Throws:
      NullPointerException - if y is null.

  • Method Details

    • isXOdd

      public boolean isXOdd()
      Get whether the x-coordinate of the point is odd.
      Returns:
      a boolean indicating whether the x-coordinate is odd.

    • getY

      public BigInteger getY()
      Get the y-coordinate of the point.
      Returns:
      the y-coordinate, represented using a BigInteger.