com.entrust.toolkit.security.arithmetic.groups.ellipticCurve

Class ECPointGFp

java.lang.Object

com.entrust.toolkit.security.arithmetic.groups.ellipticCurve.ECPoint

com.entrust.toolkit.security.arithmetic.groups.ellipticCurve.ECPointGFp

Deprecated.

since 8.0; use Entrust's new EC architecture com.entrust.toolkit.security.crypto.ec instead

public class ECPointGFp
extends ECPoint

The ECPointGFp class implements the ECPoint abstract class.

The class provides the means to represent a point, in an uncompressed form, on an elliptic curve over GF(p). Such a point is given by two field elements x, y, taken from GF(p, that satisfy the elliptic curve equation y^2 = x^3 + ax + b in GF(p). The field elements a and b determine the choice of elliptic curve.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	ECPointGFp(EllipticCurve curve) Deprecated. Produces the point at infinity.
	ECPointGFp(FieldElement x, FieldElement y, EllipticCurve curve) Deprecated. Creates an instance of the ECPointGFp given two field elements and a curve as arguments.

Method Summary

Modifier and Type	Method and Description
ECPoint	add(ECPoint point) Deprecated. Returns the sum of the calling point and the given point on the curve.
ECPoint	doublePoint() Deprecated. Returns the double point of this point on the curve.
boolean	equals(java.lang.Object object) Deprecated. Determines whether or not the given point equals the calling point.
EllipticCurve	getCurve() Deprecated. Returns the elliptic curve corresponding to the calling point.
FieldElement	getXCoordinate() Deprecated. Returns the x-coordinate of the calling point.
FieldElement	getYCoordinate() Deprecated. Returns the y-coordinate of the calling point.
boolean	isPointAtInfinity() Deprecated. Determines whether or not the calling point is the point at infinity.
ASN1Object	toASN1Object() Deprecated. Returns the elliptic curve point as an ASN1Object.
java.lang.String	toString() Deprecated. Returns the String representation of the calling point.

Methods inherited from class com.entrust.toolkit.security.arithmetic.groups.ellipticCurve.ECPoint

multiply

Methods inherited from class java.lang.Object

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

Constructor Detail

ECPointGFp

protected ECPointGFp(EllipticCurve curve)

Deprecated.

Produces the point at infinity.

Parameters:

curve - an EllipticCurve object

ECPointGFp

public ECPointGFp(FieldElement x,
                  FieldElement y,
                  EllipticCurve curve)
           throws java.lang.IllegalArgumentException

Deprecated.

Creates an instance of the ECPointGFp given two field elements and a curve as arguments.

Parameters:

x - a FieldElement object

y - a FieldElement object

curve - an EllipticCurve object

Note

Precondition: all arguments must be members of the same field. The field elements must correspond to a valid point on the elliptic curve.

Throws:

java.lang.IllegalArgumentException - if the precondition is not satisfied

Method Detail

toASN1Object

public ASN1Object toASN1Object()

Deprecated.

Returns the elliptic curve point as an ASN1Object.

The method uses the algorithm described in ANSI X9.62, section 4.3.6.

Specified by:

toASN1Object in class ECPoint

Returns:

the elliptic curve point as an OCTET_STRING

add

public ECPoint add(ECPoint point)

Deprecated.

Returns the sum of the calling point and the given point on the curve.

Specified by:

add in class ECPoint

Returns:

the sume of the points as ECPointGFp object.

doublePoint

public ECPoint doublePoint()

Deprecated.

Returns the double point of this point on the curve.

Specified by:

doublePoint in class ECPoint

Returns:

the double of the calling point

isPointAtInfinity

public boolean isPointAtInfinity()

Deprecated.

Determines whether or not the calling point is the point at infinity.

Specified by:

isPointAtInfinity in class ECPoint

Returns:

true if the calling point is the point at infinity — false otherwise

getCurve

public EllipticCurve getCurve()

Deprecated.

Returns the elliptic curve corresponding to the calling point.

Specified by:

getCurve in class ECPoint

Returns:

the curve as an EllipticCurve object.

getXCoordinate

public FieldElement getXCoordinate()

Deprecated.

Returns the x-coordinate of the calling point.

Specified by:

getXCoordinate in class ECPoint

Returns:

the x-coordinate as a FieldElement object.

getYCoordinate

public FieldElement getYCoordinate()

Deprecated.

Returns the y-coordinate of the calling point.

Specified by:

getYCoordinate in class ECPoint

Returns:

the y-coordinate as a FieldElement object.

equals

public boolean equals(java.lang.Object object)

Deprecated.

Determines whether or not the given point equals the calling point.

Specified by:

equals in class ECPoint

Returns:

true if the curves corresponding to the calling point and to the given point, and their x and y coordinates, are equal — false otherwise, it returns false.

toString

public java.lang.String toString()

Deprecated.

Returns the String representation of the calling point.

Specified by:

toString in class ECPoint

Returns:

a String representing the calling point