1 /*

     2  * Copyright 2005 Sun Microsystems, Inc.  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.  Sun designates this

     8  * particular file as subject to the "Classpath" exception as provided

     9  * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    22  * CA 95054 USA or visit www.sun.com if you need additional information or

    23  * have any questions.

    24  */

    25 

    26 package sun.security.provider;

    27 

    28 import java.math.BigInteger;

    29 import java.security.KeyRep;

    30 import java.security.InvalidKeyException;

    31 

    32 /**

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

    34  *

    35  * The difference between DSAPublicKeyImpl and DSAPublicKey is that

    36  * DSAPublicKeyImpl calls writeReplace with KeyRep, and DSAPublicKey

    37  * calls writeObject.

    38  *

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

    40  *

    41  */

    42 

    43 public final class DSAPublicKeyImpl extends DSAPublicKey {

    44 

    45     private static final long serialVersionUID = 7819830118247182730L;

    46 

    47     /**

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

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

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

    51      * cryptographic operations.  PKIX RFC2459bis explicitly allows DSA public

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

    53      * issuer's DSA public key.

    54      *

    55      * @param y the actual key bits

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

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

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

    59      */

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

    61                         BigInteger g)

    62                 throws InvalidKeyException {

    63         super(y, p, q, g);

    64     }

    65 

    66     /**

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

    68      */

    69     public DSAPublicKeyImpl(byte[] encoded) throws InvalidKeyException {

    70         super(encoded);

    71     }

    72 

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

    74         return new KeyRep(KeyRep.Type.PUBLIC,

    75                         getAlgorithm(),

    76                         getFormat(),

    77                         getEncoded());

    78     }

    79 }