/*

 * Copyright (c) 2005, 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 sun.security.provider;

import java.math.BigInteger;

import java.security.KeyRep;

import java.security.InvalidKeyException;

/**

 * An X.509 public key for the Digital Signature Algorithm.

 *

 * The difference between DSAPublicKeyImpl and DSAPublicKey is that

 * DSAPublicKeyImpl calls writeReplace with KeyRep, and DSAPublicKey

 * calls writeObject.

 *

 * See the comments in DSAKeyFactory, 4532506, and 6232513.

 *

 */

public final class DSAPublicKeyImpl extends DSAPublicKey {

    private static final long serialVersionUID = 7819830118247182730L;

    /**

     * Make a DSA public key out of a public key and three parameters.

     * The p, q, and g parameters may be null, but if so, parameters will need

     * to be supplied from some other source before this key can be used in

     * cryptographic operations.  PKIX RFC2459bis explicitly allows DSA public

     * keys without parameters, where the parameters are provided in the

     * issuer's DSA public key.

     *

     * @param y the actual key bits

     * @param p DSA parameter p, may be null if all of p, q, and g are null.

     * @param q DSA parameter q, may be null if all of p, q, and g are null.

     * @param g DSA parameter g, may be null if all of p, q, and g are null.

     */

    public DSAPublicKeyImpl(BigInteger y, BigInteger p, BigInteger q,

                        BigInteger g)

                throws InvalidKeyException {

        super(y, p, q, g);

    }

    /**

     * Make a DSA public key from its DER encoding (X.509).

     */

    public DSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException {

        super(encoded);

    }

    protected Object writeReplace() throws java.io.ObjectStreamException {

        return new KeyRep(KeyRep.Type.PUBLIC,

                        getAlgorithm(),

                        getFormat(),

                        getEncoded());

    }

}