org.spongycastle.math.ec.custom.djb

Class Curve25519Point

java.lang.Object

org.spongycastle.math.ec.ECPoint

org.spongycastle.math.ec.ECPoint.AbstractFp

org.spongycastle.math.ec.custom.djb.Curve25519Point

public class Curve25519Point
extends ECPoint.AbstractFp

Nested Class Summary

Nested classes/interfaces inherited from class org.spongycastle.math.ec.ECPoint

ECPoint.AbstractF2m, ECPoint.AbstractFp, ECPoint.F2m, ECPoint.Fp

Field Summary

Fields inherited from class org.spongycastle.math.ec.ECPoint

curve, EMPTY_ZS, preCompTable, withCompression, x, y, zs

Constructor Summary

Constructors

Constructor and Description
Curve25519Point(ECCurve curve, ECFieldElement x, ECFieldElement y) Deprecated. Use ECCurve.createPoint to construct points
Curve25519Point(ECCurve curve, ECFieldElement x, ECFieldElement y, boolean withCompression) Deprecated. per-point compression property will be removed, refer ECPoint.getEncoded(boolean)

Method Summary

Methods

Modifier and Type	Method and Description
ECPoint	add(ECPoint b)
protected Curve25519FieldElement	calculateJacobianModifiedW(Curve25519FieldElement Z, int[] ZSquared)
protected ECPoint	detach()
protected Curve25519FieldElement	getJacobianModifiedW()
ECFieldElement	getZCoord(int index)
ECPoint	negate()
ECPoint	threeTimes()
ECPoint	twice()
protected Curve25519Point	twiceJacobianModified(boolean calculateW)
ECPoint	twicePlus(ECPoint b)

Methods inherited from class org.spongycastle.math.ec.ECPoint.AbstractFp

getCompressionYTilde, satisfiesCurveEquation, subtract

Methods inherited from class org.spongycastle.math.ec.ECPoint

checkNormalized, createScaledPoint, equals, equals, getAffineXCoord, getAffineYCoord, getCurve, getCurveCoordinateSystem, getDetachedPoint, getEncoded, getEncoded, getInitialZCoords, getRawXCoord, getRawYCoord, getRawZCoords, getX, getXCoord, getY, getYCoord, getZCoords, hashCode, isCompressed, isInfinity, isNormalized, isValid, multiply, normalize, satisfiesCofactor, scaleX, scaleY, timesPow2, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Curve25519Point

public Curve25519Point(ECCurve curve,
               ECFieldElement x,
               ECFieldElement y)

Deprecated. Use ECCurve.createPoint to construct points

Create a point which encodes with point compression.

Parameters:

curve - the curve to use

x - affine x co-ordinate

y - affine y co-ordinate

Curve25519Point

public Curve25519Point(ECCurve curve,
               ECFieldElement x,
               ECFieldElement y,
               boolean withCompression)

Deprecated. per-point compression property will be removed, refer ECPoint.getEncoded(boolean)

Create a point that encodes with or without point compresion.

Parameters:

curve - the curve to use

x - affine x co-ordinate

y - affine y co-ordinate

withCompression - if true encode with point compression

Method Detail

detach

protected ECPoint detach()

Specified by:

detach in class ECPoint

getZCoord

public ECFieldElement getZCoord(int index)

Overrides:

getZCoord in class ECPoint

add

public ECPoint add(ECPoint b)

Specified by:

add in class ECPoint

twice

public ECPoint twice()

Specified by:

twice in class ECPoint

twicePlus

public ECPoint twicePlus(ECPoint b)

Overrides:

twicePlus in class ECPoint

threeTimes

public ECPoint threeTimes()

Overrides:

threeTimes in class ECPoint

negate

public ECPoint negate()

Specified by:

negate in class ECPoint

calculateJacobianModifiedW

protected Curve25519FieldElement calculateJacobianModifiedW(Curve25519FieldElement Z,
                                                int[] ZSquared)

getJacobianModifiedW

protected Curve25519FieldElement getJacobianModifiedW()

twiceJacobianModified

protected Curve25519Point twiceJacobianModified(boolean calculateW)