org.spongycastle.math.ec

Class ECPoint.Fp

java.lang.Object

org.spongycastle.math.ec.ECPoint

org.spongycastle.math.ec.ECPoint.AbstractFp

org.spongycastle.math.ec.ECPoint.Fp

Enclosing class:

ECPoint

public static class ECPoint.Fp
extends ECPoint.AbstractFp

Elliptic curve points over Fp

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

Method Summary

Modifier and Type	Method and Description
ECPoint	add(ECPoint b)
protected ECFieldElement	calculateJacobianModifiedW(ECFieldElement Z, ECFieldElement ZSquared)
protected ECPoint	detach()
protected ECFieldElement	doubleProductFromSquares(ECFieldElement a, ECFieldElement b, ECFieldElement aSquared, ECFieldElement bSquared)
protected ECFieldElement	eight(ECFieldElement x)
protected ECFieldElement	four(ECFieldElement x)
protected ECFieldElement	getJacobianModifiedW()
ECFieldElement	getZCoord(int index)
ECPoint	negate()
protected ECFieldElement	three(ECFieldElement x)
ECPoint	threeTimes()
ECPoint	timesPow2(int e)
ECPoint	twice()
protected ECPoint.Fp	twiceJacobianModified(boolean calculateW)
ECPoint	twicePlus(ECPoint b)
protected ECFieldElement	two(ECFieldElement x)

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, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

Fp

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

Deprecated. Use ECCurve.createPoint to construct points

Create a point which encodes without point compression.

Parameters:

curve - the curve to use

x - affine x co-ordinate

y - affine y co-ordinate

Fp

public Fp(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 compression.

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

timesPow2

public ECPoint timesPow2(int e)

Overrides:

timesPow2 in class ECPoint

two

protected ECFieldElement two(ECFieldElement x)

three

protected ECFieldElement three(ECFieldElement x)

four

protected ECFieldElement four(ECFieldElement x)

eight

protected ECFieldElement eight(ECFieldElement x)

doubleProductFromSquares

protected ECFieldElement doubleProductFromSquares(ECFieldElement a,
                                                  ECFieldElement b,
                                                  ECFieldElement aSquared,
                                                  ECFieldElement bSquared)

negate

public ECPoint negate()

Specified by:

negate in class ECPoint

calculateJacobianModifiedW

protected ECFieldElement calculateJacobianModifiedW(ECFieldElement Z,
                                                    ECFieldElement ZSquared)

getJacobianModifiedW

protected ECFieldElement getJacobianModifiedW()

twiceJacobianModified

protected ECPoint.Fp twiceJacobianModified(boolean calculateW)