Package org.bouncycastle.math.ec

Class ECPoint.F2m

java.lang.Object

org.bouncycastle.math.ec.ECPoint

org.bouncycastle.math.ec.ECPoint.AbstractF2m

org.bouncycastle.math.ec.ECPoint.F2m

Enclosing class:

ECPoint

public static class ECPoint.F2m
extends ECPoint.AbstractF2m

Elliptic curve points over F2m

Nested Class Summary

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

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

Field Summary

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

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

Constructor Summary

Constructors

Constructor	Description
F2m(ECCurve curve, ECFieldElement x, ECFieldElement y)	Deprecated. Use ECCurve.createPoint to construct points
F2m(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	Description
ECPoint	add(ECPoint b)
ECPoint.F2m	addSimple(ECPoint.F2m b)	Adds another ECPoints.F2m to this without checking if both points are on the same curve.
protected ECPoint	detach()
protected boolean	getCompressionYTilde()
ECFieldElement	getYCoord()	Returns the y-coordinate.
ECPoint	negate()
ECPoint	scaleX(ECFieldElement scale)
ECPoint	scaleY(ECFieldElement scale)
ECPoint	subtract(ECPoint b)
ECPoint.F2m	subtractSimple(ECPoint.F2m b)	Subtracts another ECPoints.F2m from this without checking if both points are on the same curve.
ECPoint.F2m	tau()
ECPoint	twice()
ECPoint	twicePlus(ECPoint b)

Methods inherited from class org.bouncycastle.math.ec.ECPoint.AbstractF2m

satisfiesCurveEquation

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

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

Methods inherited from class java.lang.Object

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

Constructor Detail

F2m

public F2m(ECCurve curve,
           ECFieldElement x,
           ECFieldElement y)

Deprecated.

Use ECCurve.createPoint to construct points

Parameters:

curve - base curve

x - x point

y - y point

F2m

public F2m(ECCurve curve,
           ECFieldElement x,
           ECFieldElement y,
           boolean withCompression)

Deprecated.

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

Parameters:

curve - base curve

x - x point

y - y point

withCompression - true if encode with point compression.

Method Detail

detach

protected ECPoint detach()

Specified by:

detach in class ECPoint

getYCoord

public ECFieldElement getYCoord()

Description copied from class: ECPoint

Returns the y-coordinate. Caution: depending on the curve's coordinate system, this may not be the same value as in an affine coordinate system; use normalize() to get a point where the coordinates have their affine values, or use getAffineYCoord() if you expect the point to already have been normalized.

Overrides:

getYCoord in class ECPoint

Returns:

the y-coordinate of this point

scaleX

public ECPoint scaleX(ECFieldElement scale)

Overrides:

scaleX in class ECPoint

scaleY

public ECPoint scaleY(ECFieldElement scale)

Overrides:

scaleY in class ECPoint

getCompressionYTilde

protected boolean getCompressionYTilde()

Specified by:

getCompressionYTilde in class ECPoint

add

public ECPoint add(ECPoint b)

Specified by:

add in class ECPoint

addSimple

public ECPoint.F2m addSimple(ECPoint.F2m b)

Adds another ECPoints.F2m to this without checking if both points are on the same curve. Used by multiplication algorithms, because there all points are a multiple of the same point and hence the checks can be omitted.

Parameters:

b - The other ECPoints.F2m to add to this.

Returns:

this + b

subtract

public ECPoint subtract(ECPoint b)

Specified by:

subtract in class ECPoint

subtractSimple

public ECPoint.F2m subtractSimple(ECPoint.F2m b)

Subtracts another ECPoints.F2m from this without checking if both points are on the same curve. Used by multiplication algorithms, because there all points are a multiple of the same point and hence the checks can be omitted.

Parameters:

b - The other ECPoints.F2m to subtract from this.

Returns:

this - b

tau

public ECPoint.F2m tau()

twice

public ECPoint twice()

Specified by:

twice in class ECPoint

twicePlus

public ECPoint twicePlus(ECPoint b)

Overrides:

twicePlus in class ECPoint

negate

public ECPoint negate()

Specified by:

negate in class ECPoint