1 /*
   2  * Copyright (c) 1999, 2013, 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 import java.security.spec.AlgorithmParameterSpec;
  30 
  31 /**
  32  * This class specifies the set of parameters used to generate an RSA
  33  * key pair.
  34  *
  35  * @author Jan Luehe
  36  *
  37  * @see java.security.KeyPairGenerator#initialize(java.security.spec.AlgorithmParameterSpec)
  38  *
  39  * @since 1.3
  40  */
  41 
  42 public class RSAKeyGenParameterSpec implements AlgorithmParameterSpec {
  43 
  44     private int keysize;
  45     private BigInteger publicExponent;
  46 
  47     /**
  48      * The public-exponent value F0 = 3.
  49      */
  50     public static final BigInteger F0 = BigInteger.valueOf(3);
  51 
  52     /**
  53      * The public exponent-value F4 = 65537.
  54      */
  55     public static final BigInteger F4 = BigInteger.valueOf(65537);
  56 
  57     /**
  58      * Constructs a new {@code RSAParameterSpec} object from the
  59      * given keysize and public-exponent value.
  60      *
  61      * @param keysize the modulus size (specified in number of bits)
  62      * @param publicExponent the public exponent
  63      */
  64     public RSAKeyGenParameterSpec(int keysize, BigInteger publicExponent) {
  65         this.keysize = keysize;
  66         this.publicExponent = publicExponent;
  67     }
  68 
  69     /**
  70      * Returns the keysize.
  71      *
  72      * @return the keysize.
  73      */
  74     public int getKeysize() {
  75         return keysize;
  76     }
  77 
  78     /**
  79      * Returns the public-exponent value.
  80      *
  81      * @return the public-exponent value.
  82      */
  83     public BigInteger getPublicExponent() {
  84         return publicExponent;
  85     }
  86 }