1 /*
   2  * Copyright (c) 1997, 1999, Oracle and/or its affiliates. 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.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 
  26 package java.security.spec;
  27 
  28 import java.math.BigInteger;
  29 
  30 /**
  31  * This class specifies a DSA public key with its associated parameters.
  32  *
  33  * @author Jan Luehe
  34  *
  35  *
  36  * @see java.security.Key
  37  * @see java.security.KeyFactory
  38  * @see KeySpec
  39  * @see DSAPrivateKeySpec
  40  * @see X509EncodedKeySpec
  41  *
  42  * @since 1.2
  43  */
  44 
  45 public class DSAPublicKeySpec implements KeySpec {
  46 
  47     private BigInteger y;
  48     private BigInteger p;
  49     private BigInteger q;
  50     private BigInteger g;
  51 
  52     /**
  53      * Creates a new DSAPublicKeySpec with the specified parameter values.
  54      *
  55      * @param y the public key.
  56      *
  57      * @param p the prime.
  58      *
  59      * @param q the sub-prime.
  60      *
  61      * @param g the base.
  62      */
  63     public DSAPublicKeySpec(BigInteger y, BigInteger p, BigInteger q,
  64                             BigInteger g) {
  65         this.y = y;
  66         this.p = p;
  67         this.q = q;
  68         this.g = g;
  69     }
  70 
  71     /**
  72      * Returns the public key {@code y}.
  73      *
  74      * @return the public key {@code y}.
  75      */
  76     public BigInteger getY() {
  77         return this.y;
  78     }
  79 
  80     /**
  81      * Returns the prime {@code p}.
  82      *
  83      * @return the prime {@code p}.
  84      */
  85     public BigInteger getP() {
  86         return this.p;
  87     }
  88 
  89     /**
  90      * Returns the sub-prime {@code q}.
  91      *
  92      * @return the sub-prime {@code q}.
  93      */
  94     public BigInteger getQ() {
  95         return this.q;
  96     }
  97 
  98     /**
  99      * Returns the base {@code g}.
 100      *
 101      * @return the base {@code g}.
 102      */
 103     public BigInteger getG() {
 104         return this.g;
 105     }
 106 }