libjava/classpath/gnu/java/security/jce/sig/DSSKeyFactory.java

   1 /* DSSKeyFactory.java -- JCE DSA key factory Adapter
   2    Copyright (C) 2006 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.jce.sig;
  40
  41 import gnu.java.security.Registry;
  42 import gnu.java.security.key.dss.DSSKeyPairPKCS8Codec;
  43 import gnu.java.security.key.dss.DSSKeyPairX509Codec;
  44 import gnu.java.security.key.dss.DSSPrivateKey;
  45 import gnu.java.security.key.dss.DSSPublicKey;
  46
  47 import java.math.BigInteger;
  48 import java.security.InvalidKeyException;
  49 import java.security.Key;
  50 import java.security.KeyFactorySpi;
  51 import java.security.PrivateKey;
  52 import java.security.PublicKey;
  53 import java.security.interfaces.DSAPrivateKey;
  54 import java.security.interfaces.DSAPublicKey;
  55 import java.security.spec.DSAPrivateKeySpec;
  56 import java.security.spec.DSAPublicKeySpec;
  57 import java.security.spec.InvalidKeySpecException;
  58 import java.security.spec.KeySpec;
  59 import java.security.spec.PKCS8EncodedKeySpec;
  60 import java.security.spec.X509EncodedKeySpec;
  61
  62 /**
  63  * DSA key factory.
  64  *
  65  * @author Casey Marshall (rsdio@metastatic.org)
  66  */
  67 public class DSSKeyFactory extends KeyFactorySpi
  68 {
  69   // implicit 0-arguments constructor
  70
  71   protected PublicKey engineGeneratePublic(KeySpec keySpec)
  72       throws InvalidKeySpecException
  73   {
  74     if (keySpec instanceof DSAPublicKeySpec)
  75       {
  76         DSAPublicKeySpec spec = (DSAPublicKeySpec) keySpec;
  77         BigInteger p = spec.getP();
  78         BigInteger q = spec.getQ();
  79         BigInteger g = spec.getG();
  80         BigInteger y = spec.getY();
  81         return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
  82       }
  83
  84     if (keySpec instanceof X509EncodedKeySpec)
  85       {
  86         X509EncodedKeySpec spec = (X509EncodedKeySpec) keySpec;
  87         byte[] encoded = spec.getEncoded();
  88         PublicKey result;
  89         try
  90           {
  91             result = new DSSKeyPairX509Codec().decodePublicKey(encoded);
  92             return result;
  93           }
  94         catch (RuntimeException x)
  95           {
  96             InvalidKeySpecException y = new InvalidKeySpecException();
  97             y.initCause(x);
  98             throw y;
  99           }
 100       }
 101
 102     throw new InvalidKeySpecException("Unsupported (public) key specification");
 103   }
 104
 105   protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
 106       throws InvalidKeySpecException
 107   {
 108     if (keySpec instanceof DSAPrivateKeySpec)
 109       {
 110         DSAPrivateKeySpec spec = (DSAPrivateKeySpec) keySpec;
 111         BigInteger p = spec.getP();
 112         BigInteger q = spec.getQ();
 113         BigInteger g = spec.getG();
 114         BigInteger x = spec.getX();
 115         return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x);
 116       }
 117
 118     if (keySpec instanceof PKCS8EncodedKeySpec)
 119       {
 120         PKCS8EncodedKeySpec spec = (PKCS8EncodedKeySpec) keySpec;
 121         byte[] encoded = spec.getEncoded();
 122         PrivateKey result;
 123         try
 124           {
 125             result = new DSSKeyPairPKCS8Codec().decodePrivateKey(encoded);
 126             return result;
 127           }
 128         catch (RuntimeException x)
 129           {
 130             InvalidKeySpecException y = new InvalidKeySpecException();
 131             y.initCause(x);
 132             throw y;
 133           }
 134       }
 135
 136     throw new InvalidKeySpecException("Unsupported (private) key specification");
 137   }
 138
 139   protected KeySpec engineGetKeySpec(Key key, Class keySpec)
 140       throws InvalidKeySpecException
 141   {
 142     if (key instanceof DSAPublicKey)
 143       {
 144         if (keySpec.isAssignableFrom(DSAPublicKeySpec.class))
 145           {
 146             DSAPublicKey dsaKey = (DSAPublicKey) key;
 147             BigInteger p = dsaKey.getParams().getP();
 148             BigInteger q = dsaKey.getParams().getQ();
 149             BigInteger g = dsaKey.getParams().getG();
 150             BigInteger y = dsaKey.getY();
 151             return new DSAPublicKeySpec(y, p, q, g);
 152           }
 153
 154         if (keySpec.isAssignableFrom(X509EncodedKeySpec.class))
 155           {
 156             if (key instanceof DSSPublicKey)
 157               {
 158                 DSSPublicKey dssKey = (DSSPublicKey) key;
 159                 byte[] encoded = dssKey.getEncoded(Registry.X509_ENCODING_ID);
 160                 return new X509EncodedKeySpec(encoded);
 161               }
 162
 163             if (Registry.X509_ENCODING_SORT_NAME.equalsIgnoreCase(key.getFormat()))
 164               {
 165                 byte[] encoded = key.getEncoded();
 166                 return new X509EncodedKeySpec(encoded);
 167               }
 168
 169             throw new InvalidKeySpecException("Wrong key type or unsupported (public) key specification");
 170           }
 171
 172         throw new InvalidKeySpecException("Unsupported (public) key specification");
 173       }
 174
 175     if (key instanceof DSAPrivateKey)
 176       {
 177         if (keySpec.isAssignableFrom(DSAPrivateKeySpec.class))
 178           {
 179             DSAPrivateKey dsaKey = (DSAPrivateKey) key;
 180             BigInteger p = dsaKey.getParams().getP();
 181             BigInteger q = dsaKey.getParams().getQ();
 182             BigInteger g = dsaKey.getParams().getG();
 183             BigInteger x = dsaKey.getX();
 184             return new DSAPrivateKeySpec(x, p, q, g);
 185           }
 186
 187         if (keySpec.isAssignableFrom(PKCS8EncodedKeySpec.class))
 188           {
 189             if (key instanceof DSSPrivateKey)
 190               {
 191                 DSSPrivateKey dssKey = (DSSPrivateKey) key;
 192                 byte[] encoded = dssKey.getEncoded(Registry.PKCS8_ENCODING_ID);
 193                 return new PKCS8EncodedKeySpec(encoded);
 194               }
 195
 196             if (Registry.PKCS8_ENCODING_SHORT_NAME.equalsIgnoreCase(key.getFormat()))
 197               {
 198                 byte[] encoded = key.getEncoded();
 199                 return new PKCS8EncodedKeySpec(encoded);
 200               }
 201
 202             throw new InvalidKeySpecException("Wrong key type or unsupported (private) key specification");
 203           }
 204
 205         throw new InvalidKeySpecException("Unsupported (private) key specification");
 206       }
 207
 208     throw new InvalidKeySpecException("Wrong key type or unsupported key specification");
 209   }
 210
 211   protected Key engineTranslateKey(Key key) throws InvalidKeyException
 212   {
 213     if ((key instanceof DSSPublicKey) || (key instanceof DSSPrivateKey))
 214       return key;
 215
 216     if (key instanceof DSAPublicKey)
 217       {
 218         DSAPublicKey dsaKey = (DSAPublicKey) key;
 219         BigInteger p = dsaKey.getParams().getP();
 220         BigInteger q = dsaKey.getParams().getQ();
 221         BigInteger g = dsaKey.getParams().getG();
 222         BigInteger y = dsaKey.getY();
 223         return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
 224       }
 225
 226     if (key instanceof DSAPrivateKey)
 227       {
 228         DSAPrivateKey dsaKey = (DSAPrivateKey) key;
 229         BigInteger p = dsaKey.getParams().getP();
 230         BigInteger q = dsaKey.getParams().getQ();
 231         BigInteger g = dsaKey.getParams().getG();
 232         BigInteger x = dsaKey.getX();
 233         return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x);
 234       }
 235
 236     throw new InvalidKeyException("Wrong key type");
 237   }
 238 }