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
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 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 generatorg
. -
h
- the cofactor. - Throws:
-
NullPointerException
- ifcurve
,g
, orn
is null. -
IllegalArgumentException
- ifn
orh
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.