ECParameterSpec

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

Method Summary

All Methods

Instance Methods

Concrete Methods
Modifier and Type	Method and 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 inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - 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 Detail
  - 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.