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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 | +import java.util.Arrays; | |
| 29 | + | |
| 30 | +/** | |
| 31 | + * This immutable class defines an elliptic curve (EC) prime | |
| 32 | + * finite field. | |
| 33 | + * | |
| 34 | + * @see ECField | |
| 35 | + * | |
| 36 | + * @author Valerie Peng | |
| 37 | + * | |
| 38 | + * @since 1.5 | |
| 39 | + */ | |
| 40 | +public class ECFieldFp implements ECField { | |
| 41 | + | |
| 42 | + private BigInteger p; | |
| 43 | + | |
| 44 | + /** | |
| 45 | + * Creates an elliptic curve prime finite field | |
| 46 | + * with the specified prime <code>p</code>. | |
| 47 | + * @param p the prime. | |
| 48 | + * @exception NullPointerException if <code>p</code> is null. | |
| 49 | + * @exception IllegalArgumentException if <code>p</code> | |
| 50 | + * is not positive. | |
| 51 | + */ | |
| 52 | + public ECFieldFp(BigInteger p) { | |
| 53 | + if (p.signum() != 1) { | |
| 54 | + throw new IllegalArgumentException("p is not positive"); | |
| 55 | + } | |
| 56 | + this.p = p; | |
| 57 | + } | |
| 58 | + | |
| 59 | + /** | |
| 60 | + * Returns the field size in bits which is size of prime p | |
| 61 | + * for this prime finite field. | |
| 62 | + * @return the field size in bits. | |
| 63 | + */ | |
| 64 | + public int getFieldSize() { | |
| 65 | + return p.bitLength(); | |
| 66 | + }; | |
| 67 | + | |
| 68 | + /** | |
| 69 | + * Returns the prime <code>p</code> of this prime finite field. | |
| 70 | + * @return the prime. | |
| 71 | + */ | |
| 72 | + public BigInteger getP() { | |
| 73 | + return p; | |
| 74 | + } | |
| 75 | + | |
| 76 | + /** | |
| 77 | + * Compares this prime finite field for equality with the | |
| 78 | + * specified object. | |
| 79 | + * @param obj the object to be compared. | |
| 80 | + * @return true if <code>obj</code> is an instance | |
| 81 | + * of ECFieldFp and the prime value match, false otherwise. | |
| 82 | + */ | |
| 83 | + public boolean equals(Object obj) { | |
| 84 | + if (this == obj) return true; | |
| 85 | + if (obj instanceof ECFieldFp) { | |
| 86 | + return (p.equals(((ECFieldFp)obj).p)); | |
| 87 | + } | |
| 88 | + return false; | |
| 89 | + } | |
| 90 | + | |
| 91 | + /** | |
| 92 | + * Returns a hash code value for this prime finite field. | |
| 93 | + * @return a hash code value. | |
| 94 | + */ | |
| 95 | + public int hashCode() { | |
| 96 | + return p.hashCode(); | |
| 97 | + } | |
| 98 | +} | |