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:

External Specifications

Constructor Summary

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()`	Creates and returns a copy of this object.
`boolean`	`equals(Object obj)`	Indicates whether some other object is "equal to" this one.
`protected void`	`finalize()`	Deprecated, for removal: This API element is subject to removal in a future version. Finalization is deprecated and subject to removal in a future release.
`final Class<?>`	`getClass()`	Returns the runtime class of this `Object`.
`int`	`hashCode()`	Returns a hash code value for this object.
`final void`	`notify()`	Wakes up a single thread that is waiting on this object's monitor.
`final void`	`notifyAll()`	Wakes up all threads that are waiting on this object's monitor.
`String`	`toString()`	Returns a string representation of the object.
`final void`	`wait()`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted.
`final void`	`wait(long timeoutMillis)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.
`final void`	`wait(long timeoutMillis, int nanos)`	Causes the current thread to wait until it is awakened, typically by being notified or interrupted, or until a certain amount of real time has elapsed.

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.

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