Module java.base

Package java.security.spec

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

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 java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

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.