org.bouncycastle.crypto.hash2curve.data

Class AffineXY

java.lang.Object

org.bouncycastle.crypto.hash2curve.data.AffineXY

public final class AffineXY
extends java.lang.Object

Simple holder for affine field coordinates.

Constructor Summary

Constructors

Constructor and Description
AffineXY(java.math.BigInteger x, java.math.BigInteger y) Constructs an AffineXY object representing the affine coordinates of an elliptic curve point.
AffineXY(ECPoint point) Constructs an AffineXY object representing the affine coordinates of the provided elliptic curve point.
AffineXY(ECPoint point, boolean normalize) Constructs an AffineXY object representing the affine coordinates of the provided elliptic curve point.

Method Summary

Modifier and Type	Method and Description
java.math.BigInteger	getX() Retrieves the x-coordinate of the affine point.
java.math.BigInteger	getY() Retrieves the y-coordinate of the affine point.
ECPoint	toPoint(ECCurve curve) Converts the affine coordinates of this object into an elliptic curve point on the specified curve.

Methods inherited from class java.lang.Object

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

Constructor Detail

AffineXY

public AffineXY(java.math.BigInteger x,
                java.math.BigInteger y)

Constructs an AffineXY object representing the affine coordinates of an elliptic curve point.

Parameters:

x - the x-coordinate of the affine point

y - the y-coordinate of the affine point

AffineXY

public AffineXY(ECPoint point)

Constructs an AffineXY object representing the affine coordinates of the provided elliptic curve point.

Parameters:

point - the elliptic curve point from which the affine coordinates will be extracted

Throws:

java.lang.IllegalArgumentException - if the provided point is at infinity

AffineXY

public AffineXY(ECPoint point,
                boolean normalize)

Constructs an AffineXY object representing the affine coordinates of the provided elliptic curve point.

Parameters:

point - the elliptic curve point from which the affine coordinates will be extracted

normalize - true if the point should be normalized before extracting coordinates, false otherwise

Throws:

java.lang.IllegalArgumentException - if the provided point is at infinity

Method Detail

toPoint

public ECPoint toPoint(ECCurve curve)

Converts the affine coordinates of this object into an elliptic curve point on the specified curve.

Parameters:

curve - the elliptic curve to which the point belongs

Returns:

an ECPoint object created using the affine coordinates of this object on the given curve

getX

public java.math.BigInteger getX()

Retrieves the x-coordinate of the affine point.

Returns:

the x-coordinate as a BigInteger

getY

public java.math.BigInteger getY()

Retrieves the y-coordinate of the affine point.

Returns:

the y-coordinate as a BigInteger