ECParameterSpec

AI-generated Key Takeaways

• ECParameterSpec defines the domain parameters used in Elliptic Curve Cryptography (ECC).

• It includes the elliptic curve, generator (base point), order of the generator, and cofactor.

• This class is immutable, meaning its values cannot be changed after creation.

• It provides methods to access the curve, generator, order, and cofactor.

• ECParameterSpec is an implementation of AlgorithmParameterSpec.

public class ECParameterSpec extends Object
implements AlgorithmParameterSpec

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

See Also

• AlgorithmParameterSpec

Public Constructor Summary

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

Public Method Summary

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.

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Constructors

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.

Public Methods

public int getCofactor ()

Returns the cofactor.

Returns

• the cofactor.

public EllipticCurve getCurve ()

Returns the elliptic curve that this parameter defines.

Returns

• the elliptic curve that this parameter defines.

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.

public BigInteger getOrder ()

Returns the order of the generator.

Returns

• the order of the generator.