| /* KeyPairGeneratorFactory.java -- |
| Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath is distributed in the hope that it will be useful, but |
| WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| General Public License for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.security.key; |
| |
| import gnu.java.security.Registry; |
| import gnu.java.security.key.dss.DSSKeyPairGenerator; |
| import gnu.java.security.key.rsa.RSAKeyPairGenerator; |
| |
| import java.lang.reflect.Constructor; |
| import java.util.Collections; |
| import java.util.HashSet; |
| import java.util.Set; |
| |
| /** |
| * A Factory to instantiate asymmetric keypair generators. |
| */ |
| public class KeyPairGeneratorFactory |
| { |
| /** Trivial constructor to enforce Singleton pattern. */ |
| private KeyPairGeneratorFactory() |
| { |
| super(); |
| } |
| |
| /** |
| * Returns an instance of a keypair generator given its name. |
| * |
| * @param name the case-insensitive key generator name. |
| * @return an instance of the keypair generator, or <code>null</code> if |
| * none found. |
| */ |
| public static IKeyPairGenerator getInstance(String name) |
| { |
| if (name == null) |
| return null; |
| |
| name = name.trim(); |
| IKeyPairGenerator result = null; |
| if (name.equalsIgnoreCase(Registry.DSA_KPG) |
| || name.equalsIgnoreCase(Registry.DSS_KPG)) |
| result = new DSSKeyPairGenerator(); |
| else if (name.equalsIgnoreCase(Registry.RSA_KPG)) |
| result = new RSAKeyPairGenerator(); |
| else if (name.equalsIgnoreCase(Registry.DH_KPG)) |
| result = makeInstance("gnu.javax.crypto.key.dh.GnuDHKeyPairGenerator"); |
| else if (name.equalsIgnoreCase(Registry.SRP_KPG)) |
| result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairGenerator"); |
| |
| return result; |
| } |
| |
| /** |
| * Returns a {@link Set} of keypair generator names supported by this |
| * <i>Factory</i>. Those keypair generators may be used in conjunction with |
| * the digital signature schemes with appendix supported by this library. |
| * |
| * @return a {@link Set} of keypair generator names (Strings). |
| */ |
| public static final Set getNames() |
| { |
| HashSet hs = new HashSet(); |
| hs.add(Registry.DSS_KPG); |
| hs.add(Registry.DSA_KPG); |
| hs.add(Registry.RSA_KPG); |
| hs.add(Registry.DH_KPG); |
| hs.add(Registry.SRP_KPG); |
| return Collections.unmodifiableSet(hs); |
| } |
| |
| private static IKeyPairGenerator makeInstance(String clazz) |
| { |
| try |
| { |
| Class c = Class.forName(clazz); |
| Constructor ctor = c.getConstructor(new Class[0]); |
| return (IKeyPairGenerator) ctor.newInstance(new Object[0]); |
| } |
| catch (Exception x) |
| { |
| throw new IllegalArgumentException( |
| "strong crypto key pair generator not available: " + clazz, x); |
| } |
| } |
| } |