java.security.spec

Class ECPoint

java.lang.Object

java.security.spec.ECPoint

public class ECPoint
extends Object

This immutable class represents a point on an elliptic curve (EC) in affine coordinates. Other coordinate systems can extend this class to represent this point in other coordinates.

Since:

1.5

Field Summary

Fields

Modifier and Type	Field and Description
static ECPoint	POINT_INFINITY This defines the point at infinity.

Constructor Summary

Constructors

Constructor and Description
ECPoint(BigInteger x, BigInteger y) Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(Object obj) Compares this elliptic curve point for equality with the specified object.
BigInteger	getAffineX() Returns the affine x-coordinate x.
BigInteger	getAffineY() Returns the affine y-coordinate y.
int	hashCode() Returns a hash code value for this elliptic curve point.

Methods inherited from class java.lang.Object

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

Field Detail

POINT_INFINITY

public static final ECPoint POINT_INFINITY

This defines the point at infinity.

Constructor Detail

ECPoint

public ECPoint(BigInteger x,
       BigInteger y)

Creates an ECPoint from the specified affine x-coordinate x and affine y-coordinate y.

Parameters:

x - the affine x-coordinate.

y - the affine y-coordinate.

Throws:

NullPointerException - if x or y is null.

Method Detail

getAffineX

public BigInteger getAffineX()

Returns the affine x-coordinate x. Note: POINT_INFINITY has a null affine x-coordinate.

Returns:

the affine x-coordinate.

getAffineY

public BigInteger getAffineY()

Returns the affine y-coordinate y. Note: POINT_INFINITY has a null affine y-coordinate.

Returns:

the affine y-coordinate.

equals

public boolean equals(Object obj)

Compares this elliptic curve point for equality with the specified object.

Overrides:

equals in class Object

Parameters:

obj - the object to be compared.

Returns:

true if obj is an instance of ECPoint and the affine coordinates match, false otherwise.

See Also:

Object.hashCode(), HashMap

hashCode

public int hashCode()

Returns a hash code value for this elliptic curve point.

Overrides:

hashCode in class Object

Returns:

a hash code value.

See Also:

Object.equals(java.lang.Object), System.identityHashCode(java.lang.Object)