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    1   /*
    2    * Copyright (c) 1997, 2007, 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 javax.crypto.spec;
   27   
   28   import java.math.BigInteger;
   29   import java.security.spec.AlgorithmParameterSpec;
   30   
   31   /**
   32    * This class specifies the set of parameters used for generating
   33    * Diffie-Hellman (system) parameters for use in Diffie-Hellman key
   34    * agreement. This is typically done by a central
   35    * authority.
   36    *
   37    * <p> The central authority, after computing the parameters, must send this
   38    * information to the parties looking to agree on a secret key.
   39    *
   40    * @author Jan Luehe
   41    *
   42    * @see DHParameterSpec
   43    * @since 1.4
   44    */
   45   public class DHGenParameterSpec implements AlgorithmParameterSpec {
   46   
   47       // The size in bits of the prime modulus
   48       private int primeSize;
   49   
   50       // The size in bits of the random exponent (private value)
   51       private int exponentSize;
   52   
   53       /**
   54        * Constructs a parameter set for the generation of Diffie-Hellman
   55        * (system) parameters. The constructed parameter set can be used to
   56        * initialize an
   57        * {@link java.security.AlgorithmParameterGenerator AlgorithmParameterGenerator}
   58        * object for the generation of Diffie-Hellman parameters.
   59        *
   60        * @param primeSize the size (in bits) of the prime modulus.
   61        * @param exponentSize the size (in bits) of the random exponent.
   62        */
   63       public DHGenParameterSpec(int primeSize, int exponentSize) {
   64           this.primeSize = primeSize;
   65           this.exponentSize = exponentSize;
   66       }
   67   
   68       /**
   69        * Returns the size in bits of the prime modulus.
   70        *
   71        * @return the size in bits of the prime modulus
   72        */
   73       public int getPrimeSize() {
   74           return this.primeSize;
   75       }
   76   
   77       /**
   78        * Returns the size in bits of the random exponent (private value).
   79        *
   80        * @return the size in bits of the random exponent (private value)
   81        */
   82       public int getExponentSize() {
   83           return this.exponentSize;
   84       }
   85   }

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