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| 1 | /* | ||
| 2 | * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | package java.security.spec; | ||
| 26 | |||
| 27 | import java.math.BigInteger; | ||
| 28 | |||
| 29 | /** | ||
| 30 | * This immutable class specifies the set of domain parameters | ||
| 31 | * used with elliptic curve cryptography (ECC). | ||
| 32 | * | ||
| 33 | * @see AlgorithmParameterSpec | ||
| 34 | * | ||
| 35 | * @author Valerie Peng | ||
| 36 | * | ||
| 37 | * @since 1.5 | ||
| 38 | */ | ||
| 39 | public class ECParameterSpec implements AlgorithmParameterSpec { | ||
| 40 | |||
| 41 | private final EllipticCurve curve; | ||
| 42 | private final ECPoint g; | ||
| 43 | private final BigInteger n; | ||
| 44 | private final int h; | ||
| 45 | |||
| 46 | /** | ||
| 47 | * Creates elliptic curve domain parameters based on the | ||
| 48 | * specified values. | ||
| 49 | * @param curve the elliptic curve which this parameter | ||
| 50 | * defines. | ||
| 51 | * @param g the generator which is also known as the base point. | ||
| 52 | * @param n the order of the generator <code>g</code>. | ||
| 53 | * @param h the cofactor. | ||
| 54 | * @exception NullPointerException if <code>curve</code>, | ||
| 55 | * <code>g</code>, or <code>n</code> is null. | ||
| 56 | * @exception IllegalArgumentException if <code>n</code> | ||
| 57 | * or <code>h</code> is not positive. | ||
| 58 | */ | ||
| 59 | public ECParameterSpec(EllipticCurve curve, ECPoint g, | ||
| 60 | BigInteger n, int h) { | ||
| 61 | if (curve == null) { | ||
| 62 | throw new NullPointerException("curve is null"); | ||
| 63 | } | ||
| 64 | if (g == null) { | ||
| 65 | throw new NullPointerException("g is null"); | ||
| 66 | } | ||
| 67 | if (n == null) { | ||
| 68 | throw new NullPointerException("n is null"); | ||
| 69 | } | ||
| 70 | if (n.signum() != 1) { | ||
| 71 | throw new IllegalArgumentException("n is not positive"); | ||
| 72 | } | ||
| 73 | if (h <= 0) { | ||
| 74 | throw new IllegalArgumentException("h is not positive"); | ||
| 75 | } | ||
| 76 | this.curve = curve; | ||
| 77 | this.g = g; | ||
| 78 | this.n = n; | ||
| 79 | this.h = h; | ||
| 80 | } | ||
| 81 | |||
| 82 | /** | ||
| 83 | * Returns the elliptic curve that this parameter defines. | ||
| 84 | * @return the elliptic curve that this parameter defines. | ||
| 85 | */ | ||
| 86 | public EllipticCurve getCurve() { | ||
| 87 | return curve; | ||
| 88 | } | ||
| 89 | |||
| 90 | /** | ||
| 91 | * Returns the generator which is also known as the base point. | ||
| 92 | * @return the generator which is also known as the base point. | ||
| 93 | */ | ||
| 94 | public ECPoint getGenerator() { | ||
| 95 | return g; | ||
| 96 | } | ||
| 97 | |||
| 98 | /** | ||
| 99 | * Returns the order of the generator. | ||
| 100 | * @return the order of the generator. | ||
| 101 | */ | ||
| 102 | public BigInteger getOrder() { | ||
| 103 | return n; | ||
| 104 | } | ||
| 105 | |||
| 106 | /** | ||
| 107 | * Returns the cofactor. | ||
| 108 | * @return the cofactor. | ||
| 109 | */ | ||
| 110 | public int getCofactor() { | ||
| 111 | return h; | ||
| 112 | } | ||
| 113 | } | ||