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 * 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.
 *
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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.
/**
 * 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.
Params:
y – the actual key bits
p – DSA parameter p, may be null if all of p, q, and g are null.
q – DSA parameter q, may be null if all of p, q, and g are null.
g – DSA parameter g, may be null if all of p, q, and g are null./**
     * 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).
/**
     * 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());
    }
}