com.entrust.toolkit.security.crypto.ec

Class InternalEllipticCurve

java.lang.Object

java.security.spec.EllipticCurve

com.entrust.toolkit.security.crypto.ec.InternalEllipticCurve

public final class InternalEllipticCurve
extends java.security.spec.EllipticCurve

Entrust's implementation of an elliptic curve; exists only to workaround a bug in java.security.spec.EllipticCurve under J2SE 1.5.

Under J2SE 1.5, the java.security.spec.EllipticCurve contains a bug that causes it to reject valid curves as invalid, specifically, any curve that has a zero first or second coefficient. This is in contradiction to ANSI X9.63-2001 which indicates that a first or second coefficient of zero is permitted. In fact, the following curves which are defined in ANSI X9.63-2001, actually have a zero first or second coefficient: ansip160k1, ansip192k1, ansip224k1, ansip256k1.

Since:

7.2 SP2

See Also:

EllipticCurve

Method Summary

Methods

Modifier and Type	Method and Description
boolean	equals(java.lang.Object obj) Compares this elliptic curve for equality with the specified object.
java.math.BigInteger	getA() Returns the first coefficient a of the elliptic curve.
java.math.BigInteger	getB() Returns the second coefficient b of the elliptic curve.
int	hashCode() Returns a hash code value for this elliptic curve.

Methods inherited from class java.security.spec.EllipticCurve

getField, getSeed

Methods inherited from class java.lang.Object

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

Method Detail

getA

public java.math.BigInteger getA()

Returns the first coefficient a of the elliptic curve.

Overrides:

getA in class java.security.spec.EllipticCurve

Returns:

the first coefficient a.

getB

public java.math.BigInteger getB()

Returns the second coefficient b of the elliptic curve.

Overrides:

getB in class java.security.spec.EllipticCurve

Returns:

the second coefficient b.

equals

public boolean equals(java.lang.Object obj)

Compares this elliptic curve for equality with the specified object.

Overrides:

equals in class java.security.spec.EllipticCurve

Parameters:

obj - the object to be compared.

Returns:

true if obj is an instance of EllipticCurve and the field, A, B, and seeding bytes match, false otherwise.

hashCode

public int hashCode()

Returns a hash code value for this elliptic curve.

Overrides:

hashCode in class java.security.spec.EllipticCurve

Returns:

a hash code value.