Source for gnu.java.security.jce.sig.DSSKeyFactory

   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
  68:     extends KeyFactorySpi
  69: {
  70:   // implicit 0-arguments constructor
  71: 
  72:   protected PublicKey engineGeneratePublic(KeySpec keySpec)
  73:       throws InvalidKeySpecException
  74:   {
  75:     if (keySpec instanceof DSAPublicKeySpec)
  76:       {
  77:         DSAPublicKeySpec spec = (DSAPublicKeySpec) keySpec;
  78:         BigInteger p = spec.getP();
  79:         BigInteger q = spec.getQ();
  80:         BigInteger g = spec.getG();
  81:         BigInteger y = spec.getY();
  82:         return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
  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:             throw new InvalidKeySpecException(x.getMessage(), x);
  97:           }
  98:       }
  99:     throw new InvalidKeySpecException("Unsupported (public) key specification");
 100:   }
 101: 
 102:   protected PrivateKey engineGeneratePrivate(KeySpec keySpec)
 103:       throws InvalidKeySpecException
 104:   {
 105:     if (keySpec instanceof DSAPrivateKeySpec)
 106:       {
 107:         DSAPrivateKeySpec spec = (DSAPrivateKeySpec) keySpec;
 108:         BigInteger p = spec.getP();
 109:         BigInteger q = spec.getQ();
 110:         BigInteger g = spec.getG();
 111:         BigInteger x = spec.getX();
 112:         return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x);
 113:       }
 114:     if (keySpec instanceof PKCS8EncodedKeySpec)
 115:       {
 116:         PKCS8EncodedKeySpec spec = (PKCS8EncodedKeySpec) keySpec;
 117:         byte[] encoded = spec.getEncoded();
 118:         PrivateKey result;
 119:         try
 120:           {
 121:             result = new DSSKeyPairPKCS8Codec().decodePrivateKey(encoded);
 122:             return result;
 123:           }
 124:         catch (RuntimeException x)
 125:           {
 126:             throw new InvalidKeySpecException(x.getMessage(), x);
 127:           }
 128:       }
 129:     throw new InvalidKeySpecException("Unsupported (private) key specification");
 130:   }
 131: 
 132:   protected KeySpec engineGetKeySpec(Key key, Class keySpec)
 133:       throws InvalidKeySpecException
 134:   {
 135:     if (key instanceof DSAPublicKey)
 136:       {
 137:         if (keySpec.isAssignableFrom(DSAPublicKeySpec.class))
 138:           {
 139:             DSAPublicKey dsaKey = (DSAPublicKey) key;
 140:             BigInteger p = dsaKey.getParams().getP();
 141:             BigInteger q = dsaKey.getParams().getQ();
 142:             BigInteger g = dsaKey.getParams().getG();
 143:             BigInteger y = dsaKey.getY();
 144:             return new DSAPublicKeySpec(y, p, q, g);
 145:           }
 146:         if (keySpec.isAssignableFrom(X509EncodedKeySpec.class))
 147:           {
 148:             if (key instanceof DSSPublicKey)
 149:               {
 150:                 DSSPublicKey dssKey = (DSSPublicKey) key;
 151:                 byte[] encoded = dssKey.getEncoded(Registry.X509_ENCODING_ID);
 152:                 return new X509EncodedKeySpec(encoded);
 153:               }
 154:             if (Registry.X509_ENCODING_SORT_NAME.equalsIgnoreCase(key.getFormat()))
 155:               {
 156:                 byte[] encoded = key.getEncoded();
 157:                 return new X509EncodedKeySpec(encoded);
 158:               }
 159:             throw new InvalidKeySpecException(
 160:                 "Wrong key type or unsupported (public) key specification");
 161:           }
 162:         throw new InvalidKeySpecException("Unsupported (public) key specification");
 163:       }
 164:     if (key instanceof DSAPrivateKey)
 165:       {
 166:         if (keySpec.isAssignableFrom(DSAPrivateKeySpec.class))
 167:           {
 168:             DSAPrivateKey dsaKey = (DSAPrivateKey) key;
 169:             BigInteger p = dsaKey.getParams().getP();
 170:             BigInteger q = dsaKey.getParams().getQ();
 171:             BigInteger g = dsaKey.getParams().getG();
 172:             BigInteger x = dsaKey.getX();
 173:             return new DSAPrivateKeySpec(x, p, q, g);
 174:           }
 175:         if (keySpec.isAssignableFrom(PKCS8EncodedKeySpec.class))
 176:           {
 177:             if (key instanceof DSSPrivateKey)
 178:               {
 179:                 DSSPrivateKey dssKey = (DSSPrivateKey) key;
 180:                 byte[] encoded = dssKey.getEncoded(Registry.PKCS8_ENCODING_ID);
 181:                 return new PKCS8EncodedKeySpec(encoded);
 182:               }
 183:             if (Registry.PKCS8_ENCODING_SHORT_NAME.equalsIgnoreCase(key.getFormat()))
 184:               {
 185:                 byte[] encoded = key.getEncoded();
 186:                 return new PKCS8EncodedKeySpec(encoded);
 187:               }
 188:             throw new InvalidKeySpecException(
 189:                 "Wrong key type or unsupported (private) key specification");
 190:           }
 191:         throw new InvalidKeySpecException("Unsupported (private) key specification");
 192:       }
 193:     throw new InvalidKeySpecException("Wrong key type or unsupported key specification");
 194:   }
 195: 
 196:   protected Key engineTranslateKey(Key key) throws InvalidKeyException
 197:   {
 198:     if ((key instanceof DSSPublicKey) || (key instanceof DSSPrivateKey))
 199:       return key;
 200: 
 201:     if (key instanceof DSAPublicKey)
 202:       {
 203:         DSAPublicKey dsaKey = (DSAPublicKey) key;
 204:         BigInteger p = dsaKey.getParams().getP();
 205:         BigInteger q = dsaKey.getParams().getQ();
 206:         BigInteger g = dsaKey.getParams().getG();
 207:         BigInteger y = dsaKey.getY();
 208:         return new DSSPublicKey(Registry.X509_ENCODING_ID, p, q, g, y);
 209:       }
 210:     if (key instanceof DSAPrivateKey)
 211:       {
 212:         DSAPrivateKey dsaKey = (DSAPrivateKey) key;
 213:         BigInteger p = dsaKey.getParams().getP();
 214:         BigInteger q = dsaKey.getParams().getQ();
 215:         BigInteger g = dsaKey.getParams().getG();
 216:         BigInteger x = dsaKey.getX();
 217:         return new DSSPrivateKey(Registry.PKCS8_ENCODING_ID, p, q, g, x);
 218:       }
 219:     throw new InvalidKeyException("Wrong key type");
 220:   }
 221: }