Class ECPoint.F2m

java.lang.Object

org.gudy.bouncycastle.math.ec.ECPoint

org.gudy.bouncycastle.math.ec.ECPoint.F2m

Enclosing class:

ECPoint

public static class ECPoint.F2m
extends ECPoint

Elliptic curve points over F2m

Nested Class Summary

Nested classes/interfaces inherited from class ECPoint

ECPoint.F2m, ECPoint.Fp

Field Summary

Fields inherited from class ECPoint

curve, multiplier, preCompInfo, withCompression, x, y

Constructor Summary

Constructors

Constructor	Description
F2m(ECCurve curve)	Deprecated. use ECCurve.getInfinity() Constructor for point at infinity
F2m(ECCurve curve, ECFieldElement x, ECFieldElement y)
F2m(ECCurve curve, ECFieldElement x, ECFieldElement y, boolean withCompression)

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.
private static void	checkPoints(ECPoint a, ECPoint b)	Check, if two ECPoints can be added or subtracted.
byte[]	getEncoded(boolean ignore)
ECPoint	negate()
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	twice()

Methods inherited from class ECPoint

assertECMultiplier, equals, getCurve, getX, getY, hashCode, isCompressed, isInfinity, multiply, setPreCompInfo

Methods inherited from class Object

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

Constructor Details

F2m

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

Parameters:

curve - base curve

x - x point

y - y point

F2m

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

Parameters:

curve - base curve

x - x point

y - y point

withCompression - true if encode with point compression.

F2m

public F2m(ECCurve curve)

Deprecated.

use ECCurve.getInfinity() Constructor for point at infinity

Method Details

getEncoded

public byte[] getEncoded(boolean ignore)

Specified by:

getEncoded in class ECPoint

checkPoints

private static void checkPoints(ECPoint a,
 ECPoint b)

Check, if two ECPoints can be added or subtracted.

Parameters:

a - The first ECPoint to check.

b - The second ECPoint to check.

Throws:

IllegalArgumentException - if a and b cannot be added.

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

twice

public ECPoint twice()

Specified by:

twice in class ECPoint

negate

public ECPoint negate()

Specified by:

negate in class ECPoint