/* * 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;import java.util.Arrays;/** * This immutable class defines an elliptic curve (EC) prime * finite field. * * @see ECField * * @author Valerie Peng * * @since 1.5 */public class ECFieldFp implements ECField { private BigInteger p; /** * Creates an elliptic curve prime finite field * with the specified prime <code>p</code>. * @param p the prime. * @exception NullPointerException if <code>p</code> is null. * @exception IllegalArgumentException if <code>p</code> * is not positive. */ public ECFieldFp(BigInteger p) { if (p.signum() != 1) { throw new IllegalArgumentException("p is not positive"); } this.p = p; } /** * Returns the field size in bits which is size of prime p * for this prime finite field. * @return the field size in bits. */ public int getFieldSize() { return p.bitLength(); }; /** * Returns the prime <code>p</code> of this prime finite field. * @return the prime. */ public BigInteger getP() { return p; } /** * Compares this prime finite field for equality with the * specified object. * @param obj the object to be compared. * @return true if <code>obj</code> is an instance * of ECFieldFp and the prime value match, false otherwise. */ public boolean equals(Object obj) { if (this == obj) return true; if (obj instanceof ECFieldFp) { return (p.equals(((ECFieldFp)obj).p)); } return false; } /** * Returns a hash code value for this prime finite field. * @return a hash code value. */ public int hashCode() { return p.hashCode(); }}
/*
* 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;
import java.util.Arrays;
/**
* This immutable class defines an elliptic curve (EC) prime
* finite field.
*
* @see ECField
*
* @author Valerie Peng
*
* @since 1.5
*/
public class ECFieldFp implements ECField {
private BigInteger p;
/**
* Creates an elliptic curve prime finite field
* with the specified prime <code>p</code>.
* @param p the prime.
* @exception NullPointerException if <code>p</code> is null.
* @exception IllegalArgumentException if <code>p</code>
* is not positive.
*/
public ECFieldFp(BigInteger p) {
if (p.signum() != 1) {
throw new IllegalArgumentException("p is not positive");
}
this.p = p;
}
/**
* Returns the field size in bits which is size of prime p
* for this prime finite field.
* @return the field size in bits.
*/
public int getFieldSize() {
return p.bitLength();
};
/**
* Returns the prime <code>p</code> of this prime finite field.
* @return the prime.
*/
public BigInteger getP() {
return p;
}
/**
* Compares this prime finite field for equality with the
* specified object.
* @param obj the object to be compared.
* @return true if <code>obj</code> is an instance
* of ECFieldFp and the prime value match, false otherwise.
*/
public boolean equals(Object obj) {
if (this == obj) return true;
if (obj instanceof ECFieldFp) {
return (p.equals(((ECFieldFp)obj).p));
}
return false;
}
/**
* Returns a hash code value for this prime finite field.
* @return a hash code value.
*/
public int hashCode() {
return p.hashCode();
}
}