0N/A/*
2362N/A * Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
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2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
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0N/A *
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0N/A */
0N/Apackage java.security.spec;
0N/A
0N/Aimport java.math.BigInteger;
0N/Aimport java.util.Arrays;
0N/A
0N/A/**
0N/A * This immutable class defines an elliptic curve (EC) prime
0N/A * finite field.
0N/A *
0N/A * @see ECField
0N/A *
0N/A * @author Valerie Peng
0N/A *
0N/A * @since 1.5
0N/A */
0N/Apublic class ECFieldFp implements ECField {
0N/A
0N/A private BigInteger p;
0N/A
0N/A /**
0N/A * Creates an elliptic curve prime finite field
0N/A * with the specified prime <code>p</code>.
0N/A * @param p the prime.
0N/A * @exception NullPointerException if <code>p</code> is null.
0N/A * @exception IllegalArgumentException if <code>p</code>
0N/A * is not positive.
0N/A */
0N/A public ECFieldFp(BigInteger p) {
0N/A if (p.signum() != 1) {
0N/A throw new IllegalArgumentException("p is not positive");
0N/A }
0N/A this.p = p;
0N/A }
0N/A
0N/A /**
0N/A * Returns the field size in bits which is size of prime p
0N/A * for this prime finite field.
0N/A * @return the field size in bits.
0N/A */
0N/A public int getFieldSize() {
0N/A return p.bitLength();
0N/A };
0N/A
0N/A /**
0N/A * Returns the prime <code>p</code> of this prime finite field.
0N/A * @return the prime.
0N/A */
0N/A public BigInteger getP() {
0N/A return p;
0N/A }
0N/A
0N/A /**
0N/A * Compares this prime finite field for equality with the
0N/A * specified object.
0N/A * @param obj the object to be compared.
0N/A * @return true if <code>obj</code> is an instance
0N/A * of ECFieldFp and the prime value match, false otherwise.
0N/A */
0N/A public boolean equals(Object obj) {
0N/A if (this == obj) return true;
0N/A if (obj instanceof ECFieldFp) {
0N/A return (p.equals(((ECFieldFp)obj).p));
0N/A }
0N/A return false;
0N/A }
0N/A
0N/A /**
0N/A * Returns a hash code value for this prime finite field.
0N/A * @return a hash code value.
0N/A */
0N/A public int hashCode() {
0N/A return p.hashCode();
0N/A }
0N/A}