Showing the changes to java/pkg/java/security/spec/ECFieldFp.java (1 of 18352 files). Show all
Unified · Split
| @@ -0,0 +1,98 @@ | |||
| 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 | } | ||