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114 lines
2.5 KiB
114 lines
2.5 KiB
/*
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* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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package java.security.spec;
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import java.math.BigInteger;
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/**
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* This immutable class specifies the set of domain parameters
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* used with elliptic curve cryptography (ECC).
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*
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* @see AlgorithmParameterSpec
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*
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* @author Valerie Peng
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*
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* @since 1.5
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*/
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public class ECParameterSpec implements AlgorithmParameterSpec {
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private final EllipticCurve curve;
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private final ECPoint g;
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private final BigInteger n;
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private final int h;
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/**
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* Creates elliptic curve domain parameters based on the
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* specified values.
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* @param curve the elliptic curve which this parameter
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* defines.
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* @param g the generator which is also known as the base point.
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* @param n the order of the generator {@code g}.
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* @param h the cofactor.
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* @exception NullPointerException if {@code curve},
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* {@code g}, or {@code n} is null.
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* @exception IllegalArgumentException if {@code n}
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* or {@code h} is not positive.
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*/
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public ECParameterSpec(EllipticCurve curve, ECPoint g,
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BigInteger n, int h) {
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if (curve == null) {
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throw new NullPointerException("curve is null");
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}
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if (g == null) {
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throw new NullPointerException("g is null");
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}
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if (n == null) {
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throw new NullPointerException("n is null");
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}
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if (n.signum() != 1) {
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throw new IllegalArgumentException("n is not positive");
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}
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if (h <= 0) {
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throw new IllegalArgumentException("h is not positive");
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}
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this.curve = curve;
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this.g = g;
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this.n = n;
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this.h = h;
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}
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/**
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* Returns the elliptic curve that this parameter defines.
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* @return the elliptic curve that this parameter defines.
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*/
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public EllipticCurve getCurve() {
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return curve;
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}
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/**
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* Returns the generator which is also known as the base point.
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* @return the generator which is also known as the base point.
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*/
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public ECPoint getGenerator() {
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return g;
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}
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/**
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* Returns the order of the generator.
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* @return the order of the generator.
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*/
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public BigInteger getOrder() {
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return n;
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}
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/**
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* Returns the cofactor.
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* @return the cofactor.
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*/
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public int getCofactor() {
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return h;
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}
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}
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