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ECPoint

public class ECPoint
extends Object

java.lang.Object
   ↳ java.security.spec.ECPoint


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.

Summary

Fields

public static final ECPoint POINT_INFINITY

This defines the point at infinity.

Public constructors

ECPoint(BigInteger x, BigInteger y)

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

Public methods

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.

Inherited methods

Fields

POINT_INFINITY

added in API level 1
public static final ECPoint POINT_INFINITY

This defines the point at infinity.

Public constructors

ECPoint

added in API level 1
public ECPoint (BigInteger x, 
                BigInteger y)

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

Parameters
x BigInteger: the affine x-coordinate.

y BigInteger: the affine y-coordinate.

Throws
NullPointerException if x or y is null.

Public methods

equals

added in API level 1
public boolean equals (Object obj)

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

Parameters
obj Object: the object to be compared.

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

getAffineX

added in API level 1
public BigInteger getAffineX ()

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

Returns
BigInteger the affine x-coordinate.

getAffineY

added in API level 1
public BigInteger getAffineY ()

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

Returns
BigInteger the affine y-coordinate.

hashCode

added in API level 1
public int hashCode ()

Returns a hash code value for this elliptic curve point.

Returns
int a hash code value.