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

Constructors

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.

Methods

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.