Module java.base

Package java.security.spec

Class ECParameterSpec

java.lang.Object

java.security.spec.ECParameterSpec

All Implemented Interfaces:

AlgorithmParameterSpec

public class ECParameterSpec
extends Object
implements AlgorithmParameterSpec

This immutable class specifies the set of domain parameters used with elliptic curve cryptography (ECC).

Since:

1.5

See Also:

• AlgorithmParameterSpec

Constructor Summary

Constructors

Constructor	Description
ECParameterSpec(EllipticCurve curve, ECPoint g, BigInteger n, int h)	Creates elliptic curve domain parameters based on the specified values.

Method Summary

Modifier and Type	Method	Description
int	getCofactor()	Returns the cofactor.
EllipticCurve	getCurve()	Returns the elliptic curve that this parameter defines.
ECPoint	getGenerator()	Returns the generator which is also known as the base point.
BigInteger	getOrder()	Returns the order of the generator.

Methods declared in class java.lang.Object

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

Constructor Details

ECParameterSpec

public ECParameterSpec(EllipticCurve curve,
 ECPoint g,
 BigInteger n,
 int h)

Creates elliptic curve domain parameters based on the specified values.

Parameters:

curve - the elliptic curve which this parameter defines.

g - the generator which is also known as the base point.

n - the order of the generator g.

h - the cofactor.

Throws:

NullPointerException - if curve, g, or n is null.

IllegalArgumentException - if n or h is not positive.

Method Details

getCurve

public EllipticCurve getCurve()

Returns the elliptic curve that this parameter defines.

Returns:

the elliptic curve that this parameter defines.

getGenerator

public ECPoint getGenerator()

Returns the generator which is also known as the base point.

Returns:

the generator which is also known as the base point.

getOrder

public BigInteger getOrder()

Returns the order of the generator.

Returns:

the order of the generator.

getCofactor

public int getCofactor()

Returns the cofactor.

Returns:

the cofactor.