1 /* DSAKeyFactory.java -- DSA key factory. 2 Copyright (C) 2003 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., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 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.security.InvalidKeyException; 42 import java.security.Key; 43 import java.security.KeyFactorySpi; 44 import java.security.PrivateKey; 45 import java.security.PublicKey; 46 import java.security.interfaces.DSAPrivateKey; 47 import java.security.interfaces.DSAPublicKey; 48 import java.security.spec.DSAPrivateKeySpec; 49 import java.security.spec.DSAPublicKeySpec; 50 import java.security.spec.InvalidKeySpecException; 51 import java.security.spec.KeySpec; 52 53 /** 54 * DSA key factory. 55 * 56 * @author Casey Marshall (rsdio@metastatic.org) 57 */ 58 public class DSAKeyFactory extends KeyFactorySpi 59 { 60 61 // Constructor. 62 // ------------------------------------------------------------------------ 63 DSAKeyFactory()64 public DSAKeyFactory() 65 { 66 super(); 67 } 68 69 // Instance methods. 70 // ------------------------------------------------------------------------ 71 engineGeneratePrivate(KeySpec keySpec)72 protected PrivateKey engineGeneratePrivate(KeySpec keySpec) 73 throws InvalidKeySpecException 74 { 75 if (!(keySpec instanceof DSAPrivateKeySpec)) 76 throw new InvalidKeySpecException(); 77 return new GnuDSAPrivateKey( 78 ((DSAPrivateKeySpec) keySpec).getX(), 79 ((DSAPrivateKeySpec) keySpec).getP(), 80 ((DSAPrivateKeySpec) keySpec).getQ(), 81 ((DSAPrivateKeySpec) keySpec).getG()); 82 } 83 engineGeneratePublic(KeySpec keySpec)84 protected PublicKey engineGeneratePublic(KeySpec keySpec) 85 throws InvalidKeySpecException 86 { 87 if (!(keySpec instanceof DSAPublicKeySpec)) 88 throw new InvalidKeySpecException(); 89 return new GnuDSAPublicKey( 90 ((DSAPublicKeySpec) keySpec).getY(), 91 ((DSAPublicKeySpec) keySpec).getP(), 92 ((DSAPublicKeySpec) keySpec).getQ(), 93 ((DSAPublicKeySpec) keySpec).getG()); 94 } 95 engineGetKeySpec(Key key, Class keySpec)96 protected KeySpec engineGetKeySpec(Key key, Class keySpec) 97 throws InvalidKeySpecException 98 { 99 if ((key instanceof DSAPublicKey) && 100 keySpec.isAssignableFrom(DSAPublicKeySpec.class)) 101 { 102 return new DSAPublicKeySpec(((DSAPublicKey) key).getY(), 103 ((DSAPublicKey) key).getParams().getP(), 104 ((DSAPublicKey) key).getParams().getQ(), 105 ((DSAPublicKey) key).getParams().getG()); 106 } 107 if ((key instanceof DSAPrivateKey) && 108 keySpec.isAssignableFrom(DSAPrivateKeySpec.class)) 109 { 110 return new DSAPrivateKeySpec(((DSAPrivateKey) key).getX(), 111 ((DSAPrivateKey) key).getParams().getP(), 112 ((DSAPrivateKey) key).getParams().getQ(), 113 ((DSAPrivateKey) key).getParams().getG()); 114 } 115 throw new InvalidKeySpecException(); 116 } 117 engineTranslateKey(Key key)118 protected Key engineTranslateKey(Key key) throws InvalidKeyException 119 { 120 if ((key instanceof GnuDSAPublicKey) || (key instanceof GnuDSAPrivateKey)) 121 return key; 122 if (key instanceof DSAPublicKey) 123 return new GnuDSAPublicKey(((DSAPublicKey) key).getY(), 124 ((DSAPublicKey) key).getParams().getP(), 125 ((DSAPublicKey) key).getParams().getQ(), 126 ((DSAPublicKey) key).getParams().getG()); 127 if (key instanceof DSAPrivateKey) 128 return new GnuDSAPrivateKey(((DSAPrivateKey) key).getX(), 129 ((DSAPrivateKey) key).getParams().getP(), 130 ((DSAPrivateKey) key).getParams().getQ(), 131 ((DSAPrivateKey) key).getParams().getG()); 132 throw new InvalidKeyException(); 133 } 134 } 135