/* * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */package java.security.spec;import java.math.BigInteger;/** * This immutable class specifies the set of domain parameters * used with elliptic curve cryptography (ECC). * * @see AlgorithmParameterSpec * * @author Valerie Peng * * @since 1.5 */public class ECParameterSpec implements AlgorithmParameterSpec { private final EllipticCurve curve; private final ECPoint g; private final BigInteger n; private final int h; /** * Creates elliptic curve domain parameters based on the * specified values. * @param curve the elliptic curve which this parameter * defines. * @param g the generator which is also known as the base point. * @param n the order of the generator <code>g</code>. * @param h the cofactor. * @exception NullPointerException if <code>curve</code>, * <code>g</code>, or <code>n</code> is null. * @exception IllegalArgumentException if <code>n</code> * or <code>h</code> is not positive. */ public ECParameterSpec(EllipticCurve curve, ECPoint g, BigInteger n, int h) { if (curve == null) { throw new NullPointerException("curve is null"); } if (g == null) { throw new NullPointerException("g is null"); } if (n == null) { throw new NullPointerException("n is null"); } if (n.signum() != 1) { throw new IllegalArgumentException("n is not positive"); } if (h <= 0) { throw new IllegalArgumentException("h is not positive"); } this.curve = curve; this.g = g; this.n = n; this.h = h; } /** * Returns the elliptic curve that this parameter defines. * @return the elliptic curve that this parameter defines. */ public EllipticCurve getCurve() { return curve; } /** * Returns the generator which is also known as the base point. * @return the generator which is also known as the base point. */ public ECPoint getGenerator() { return g; } /** * Returns the order of the generator. * @return the order of the generator. */ public BigInteger getOrder() { return n; } /** * Returns the cofactor. * @return the cofactor. */ public int getCofactor() { return h; }}
/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.security.spec;
import java.math.BigInteger;
/**
* This immutable class specifies the set of domain parameters
* used with elliptic curve cryptography (ECC).
*
* @see AlgorithmParameterSpec
*
* @author Valerie Peng
*
* @since 1.5
*/
public class ECParameterSpec implements AlgorithmParameterSpec {
private final EllipticCurve curve;
private final ECPoint g;
private final BigInteger n;
private final int h;
/**
* Creates elliptic curve domain parameters based on the
* specified values.
* @param curve the elliptic curve which this parameter
* defines.
* @param g the generator which is also known as the base point.
* @param n the order of the generator <code>g</code>.
* @param h the cofactor.
* @exception NullPointerException if <code>curve</code>,
* <code>g</code>, or <code>n</code> is null.
* @exception IllegalArgumentException if <code>n</code>
* or <code>h</code> is not positive.
*/
public ECParameterSpec(EllipticCurve curve, ECPoint g,
BigInteger n, int h) {
if (curve == null) {
throw new NullPointerException("curve is null");
}
if (g == null) {
throw new NullPointerException("g is null");
}
if (n == null) {
throw new NullPointerException("n is null");
}
if (n.signum() != 1) {
throw new IllegalArgumentException("n is not positive");
}
if (h <= 0) {
throw new IllegalArgumentException("h is not positive");
}
this.curve = curve;
this.g = g;
this.n = n;
this.h = h;
}
/**
* Returns the elliptic curve that this parameter defines.
* @return the elliptic curve that this parameter defines.
*/
public EllipticCurve getCurve() {
return curve;
}
/**
* Returns the generator which is also known as the base point.
* @return the generator which is also known as the base point.
*/
public ECPoint getGenerator() {
return g;
}
/**
* Returns the order of the generator.
* @return the order of the generator.
*/
public BigInteger getOrder() {
return n;
}
/**
* Returns the cofactor.
* @return the cofactor.
*/
public int getCofactor() {
return h;
}
}