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1: /* DiffieHellmanKeyFactoryImpl.java -- 2: Copyright (C) 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 gnu.javax.crypto.GnuDHPrivateKey; 42: 43: import java.security.InvalidKeyException; 44: import java.security.Key; 45: import java.security.KeyFactorySpi; 46: import java.security.PrivateKey; 47: import java.security.PublicKey; 48: import java.security.spec.InvalidKeySpecException; 49: import java.security.spec.KeySpec; 50: 51: import javax.crypto.spec.DHParameterSpec; 52: import javax.crypto.spec.DHPrivateKeySpec; 53: import javax.crypto.spec.DHPublicKeySpec; 54: 55: import javax.crypto.interfaces.DHPrivateKey; 56: import javax.crypto.interfaces.DHPublicKey; 57: 58: public class DiffieHellmanKeyFactoryImpl extends KeyFactorySpi 59: { 60: protected PrivateKey engineGeneratePrivate (final KeySpec spec) 61: throws InvalidKeySpecException 62: { 63: if (spec instanceof DHPrivateKeySpec) 64: { 65: DHPrivateKeySpec dh = (DHPrivateKeySpec) spec; 66: return new GnuDHPrivateKey (dh.getX (), 67: new DHParameterSpec (dh.getP (), dh.getG ())); 68: } 69: throw new InvalidKeySpecException (); 70: } 71: 72: protected PublicKey engineGeneratePublic (final KeySpec spec) 73: throws InvalidKeySpecException 74: { 75: if (spec instanceof DHPublicKeySpec) 76: { 77: DHPublicKeySpec dh = (DHPublicKeySpec) spec; 78: return new GnuDHPublicKey (new DHParameterSpec (dh.getP (), dh.getG ()), 79: dh.getY(), null); 80: } 81: throw new InvalidKeySpecException (); 82: } 83: 84: protected KeySpec engineGetKeySpec (final Key key, final Class specClass) 85: throws InvalidKeySpecException 86: { 87: if (key instanceof DHPrivateKey) 88: { 89: if (DHPrivateKeySpec.class.isAssignableFrom (specClass)) 90: { 91: DHParameterSpec params = ((DHPrivateKey) key).getParams (); 92: return new DHPrivateKeySpec (((DHPrivateKey) key).getX (), 93: params.getP (), params.getG ()); 94: } 95: } 96: if (key instanceof DHPublicKey) 97: { 98: if (DHPublicKeySpec.class.isAssignableFrom (specClass)) 99: { 100: DHParameterSpec params = ((DHPublicKey) key).getParams (); 101: return new DHPublicKeySpec (((DHPublicKey) key).getY (), 102: params.getP (), params.getG ()); 103: } 104: } 105: throw new InvalidKeySpecException (); 106: } 107: 108: protected Key engineTranslateKey (final Key key) 109: throws InvalidKeyException 110: { 111: if (key instanceof DHPrivateKey) 112: { 113: return new GnuDHPrivateKey (((DHPrivateKey) key).getX (), 114: ((DHPrivateKey) key).getParams ()); 115: } 116: if (key instanceof DHPublicKey) 117: { 118: return new GnuDHPublicKey (((DHPublicKey) key).getParams (), 119: ((DHPublicKey) key).getY (), null); 120: } 121: throw new InvalidKeyException (); 122: } 123: }