old-autovect-branch/libjava/classpath/gnu/java/security/provider/DSAKeyPairGenerator.java

   1 /* GnuDSAKeyPairGenerator.java --- Gnu DSA Key Pair Generator
   2    Copyright (C) 1999, 2005  Free Software Foundation, Inc.
   3
   4 This file is part of GNU Classpath.
   5
   6 GNU Classpath is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2, or (at your option)
   9 any later version.
  10
  11 GNU Classpath is distributed in the hope that it will be useful, but
  12 WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14 General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with GNU Classpath; see the file COPYING.  If not, write to the
  18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19 02110-1301 USA.
  20
  21 Linking this library statically or dynamically with other modules is
  22 making a combined work based on this library.  Thus, the terms and
  23 conditions of the GNU General Public License cover the whole
  24 combination.
  25
  26 As a special exception, the copyright holders of this library give you
  27 permission to link this library with independent modules to produce an
  28 executable, regardless of the license terms of these independent
  29 modules, and to copy and distribute the resulting executable under
  30 terms of your choice, provided that you also meet, for each linked
  31 independent module, the terms and conditions of the license of that
  32 module.  An independent module is a module which is not derived from
  33 or based on this library.  If you modify this library, you may extend
  34 this exception to your version of the library, but you are not
  35 obligated to do so.  If you do not wish to do so, delete this
  36 exception statement from your version. */
  37
  38
  39 package gnu.java.security.provider;
  40
  41 import java.math.BigInteger;
  42 import java.security.AlgorithmParameterGenerator;
  43 import java.security.AlgorithmParameters;
  44 import java.security.InvalidAlgorithmParameterException;
  45 import java.security.InvalidParameterException;
  46 import java.security.KeyPair;
  47 import java.security.KeyPairGeneratorSpi;
  48 import java.security.NoSuchAlgorithmException;
  49 import java.security.SecureRandom;
  50 import java.security.interfaces.DSAParams;
  51 import java.security.spec.AlgorithmParameterSpec;
  52 import java.security.spec.DSAParameterSpec;
  53 import java.security.spec.InvalidParameterSpecException;
  54 import java.util.Random;
  55
  56 public class DSAKeyPairGenerator extends KeyPairGeneratorSpi
  57         implements java.security.interfaces.DSAKeyPairGenerator
  58 {
  59 int keysize;
  60 SecureRandom random;
  61 private BigInteger q = null; // the small prime
  62 private BigInteger p = null; // the big prime
  63 private BigInteger g = null;
  64
  65 public DSAKeyPairGenerator()
  66 {
  67         keysize = 1024;
  68         getDefaults ();
  69 }
  70
  71 public void initialize(int keysize, SecureRandom random)
  72 {
  73         initialize (keysize, false, random);
  74 }
  75
  76 public void initialize(AlgorithmParameterSpec params,
  77                        SecureRandom random)
  78                 throws InvalidAlgorithmParameterException
  79 {
  80         if( !( params instanceof DSAParameterSpec ) )
  81                 throw new InvalidAlgorithmParameterException("Must be DSAParameterSpec");
  82
  83         try
  84         {
  85                 initialize ((DSAParams) params, random);
  86         }
  87         catch (InvalidParameterException ipe)
  88         {
  89                 InvalidAlgorithmParameterException iape =
  90                         new InvalidAlgorithmParameterException();
  91                 iape.initCause (ipe);
  92                 throw iape;
  93         }
  94 }
  95
  96 public void initialize (DSAParams params, SecureRandom random)
  97 {
  98         DSAParameterSpec dsaparameterspec = (DSAParameterSpec)params;
  99         if (dsaparameterspec.getP() == null
 100             || dsaparameterspec.getQ() == null
 101             || dsaparameterspec.getG() == null)
 102         {
 103                 throw new InvalidParameterException ("none of p, q, or g may be null");
 104         }
 105         p = dsaparameterspec.getP();
 106         q = dsaparameterspec.getQ();
 107         g = dsaparameterspec.getG();
 108         this.random = random;
 109 }
 110
 111 public void initialize(int modlen, boolean genParams, SecureRandom random)
 112         throws InvalidParameterException
 113 {
 114         if( ((modlen % 64) != 0) || (modlen < 512) || (modlen > 1024) )
 115                 throw new InvalidParameterException();
 116
 117         this.keysize = modlen;
 118         this.random = random;
 119         if (this.random == null)
 120         {
 121                 this.random = new SecureRandom ();
 122         }
 123         if (genParams)
 124         {
 125                 try
 126                 {
 127                         AlgorithmParameterGenerator apgDSA = AlgorithmParameterGenerator.getInstance("DSA");
 128                         apgDSA.init (modlen, random);
 129                         AlgorithmParameters apDSA = apgDSA.generateParameters();
 130                         DSAParameterSpec dsaparameterspec = (DSAParameterSpec)apDSA.getParameterSpec( DSAParameterSpec.class );
 131                         p = dsaparameterspec.getP();
 132                         q = dsaparameterspec.getQ();
 133                         g = dsaparameterspec.getG();
 134                 }
 135                 catch (NoSuchAlgorithmException nsae)
 136                 {
 137                         InvalidParameterException ipe =
 138                                 new InvalidParameterException ("can't generate DSA parameters");
 139                         ipe.initCause (nsae);
 140                         throw ipe;
 141                 }
 142                 catch (InvalidParameterSpecException ipse)
 143                 {
 144                         InvalidParameterException ipe =
 145                                 new InvalidParameterException ("can't generate DSA parameters");
 146                         ipe.initCause (ipse);
 147                         throw ipe;
 148                 }
 149         }
 150         else if (!getDefaults ())
 151         {
 152                 throw new InvalidParameterException ("unsupported key size: " + modlen);
 153         }
 154 }
 155
 156 public KeyPair generateKeyPair()
 157 {
 158         if (random == null)
 159                 {
 160                         random = new SecureRandom ();
 161                 }
 162
 163         BigInteger x = new BigInteger( 159, random );
 164
 165         BigInteger y = g.modPow( x, p );
 166
 167         return new KeyPair( new GnuDSAPublicKey(y,p,q,g), new GnuDSAPrivateKey(x,p,q,g));
 168         //return new KeyPair( public, private );
 169 }
 170
 171 //These constants are Sun's Constants copied from the
 172 //Cryptography Specification
 173 private boolean getDefaults()
 174 {
 175         if( keysize == 512) {
 176                 p = new BigInteger("fca682ce8e12caba26efccf7110e526db078b05edecbcd1eb4a208f3ae1617ae01f35b91a47e6df63413c5e12ed0899bcd132acd50d99151bdc43ee737592e17", 16);
 177                 q = new BigInteger("962eddcc369cba8ebb260ee6b6a126d9346e38c5", 16);
 178                 g = new BigInteger("678471b27a9cf44ee91a49c5147db1a9aaf244f05a434d6486931d2d14271b9e35030b71fd73da179069b32e2935630e1c2062354d0da20a6c416e50be794ca4", 16);
 179                 return true;
 180         } else if( keysize == 768) {
 181                 p = new BigInteger("e9e642599d355f37c97ffd3567120b8e25c9cd43e927b3a9670fbec5d890141922d2c3b3ad2480093799869d1e846aab49fab0ad26d2ce6a22219d470bce7d777d4a21fbe9c270b57f607002f3cef8393694cf45ee3688c11a8c56ab127a3daf", 16);
 182                 q = new BigInteger("9cdbd84c9f1ac2f38d0f80f42ab952e7338bf511", 16);
 183                 g = new BigInteger("30470ad5a005fb14ce2d9dcd87e38bc7d1b1c5facbaecbe95f190aa7a31d23c4dbbcbe06174544401a5b2c020965d8c2bd2171d3668445771f74ba084d2029d83c1c158547f3a9f1a2715be23d51ae4d3e5a1f6a7064f316933a346d3f529252", 16);
 184                 return true;
 185         } else if( keysize == 1024) {
 186                 p = new BigInteger("fd7f53811d75122952df4a9c2eece4e7f611b7523cef4400c31e3f80b6512669455d402251fb593d8d58fabfc5f5ba30f6cb9b556cd7813b801d346ff26660b76b9950a5a49f9fe8047b1022c24fbba9d7feb7c61bf83b57e7c6a8a6150f04fb83f6d3c51ec3023554135a169132f675f3ae2b61d72aeff22203199dd14801c7", 16);
 187                 q = new BigInteger("9760508f15230bccb292b982a2eb840bf0581cf5", 16);
 188                 g = new BigInteger("f7e1a085d69b3ddecbbcab5c36b857b97994afbbfa3aea82f9574c0b3d0782675159578ebad4594fe67107108180b449167123e84c281613b7cf09328cc8a6e13c167a8b547c8d28e0a3ae1e2bb3a675916ea37f0bfa213562f1fb627a01243bcca4f1bea8519089a883dfe15ae59f06928b665e807b552564014c3bfecf492a", 16);
 189                 return true;
 190         }
 191         return false;
 192 }
 193
 194 }