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:

Constructor Summary

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 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.

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https://docs.oracle.com/en/java/javase/25/docs/api/java.base/java/security/spec/ECParameterSpec.html