1 /* KeyPairGeneratorFactory.java --
2 Copyright 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
4 This file is a part of GNU Classpath.
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 of the License, or (at
9 your option) any later version.
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.
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; if not, write to the Free Software
18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301
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
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. */
39 package gnu.java.security.key;
41 import gnu.java.security.Registry;
42 import gnu.java.security.key.dss.DSSKeyPairGenerator;
43 import gnu.java.security.key.rsa.RSAKeyPairGenerator;
45 import java.lang.reflect.Constructor;
46 import java.util.Collections;
47 import java.util.HashSet;
51 * A Factory to instantiate asymmetric keypair generators.
53 public class KeyPairGeneratorFactory
55 /** Trivial constructor to enforce Singleton pattern. */
56 private KeyPairGeneratorFactory()
62 * Returns an instance of a keypair generator given its name.
64 * @param name the case-insensitive key generator name.
65 * @return an instance of the keypair generator, or <code>null</code> if
68 public static IKeyPairGenerator getInstance(String name)
74 IKeyPairGenerator result = null;
75 if (name.equalsIgnoreCase(Registry.DSA_KPG)
76 || name.equalsIgnoreCase(Registry.DSS_KPG))
77 result = new DSSKeyPairGenerator();
78 else if (name.equalsIgnoreCase(Registry.RSA_KPG))
79 result = new RSAKeyPairGenerator();
80 else if (name.equalsIgnoreCase(Registry.DH_KPG))
81 result = makeInstance("gnu.javax.crypto.key.dh.GnuDHKeyPairGenerator");
82 else if (name.equalsIgnoreCase(Registry.SRP_KPG))
83 result = makeInstance("gnu.javax.crypto.key.srp6.SRPKeyPairGenerator");
89 * Returns a {@link Set} of keypair generator names supported by this
90 * <i>Factory</i>. Those keypair generators may be used in conjunction with
91 * the digital signature schemes with appendix supported by this library.
93 * @return a {@link Set} of keypair generator names (Strings).
95 public static final Set getNames()
97 HashSet hs = new HashSet();
98 hs.add(Registry.DSS_KPG);
99 hs.add(Registry.DSA_KPG);
100 hs.add(Registry.RSA_KPG);
101 hs.add(Registry.DH_KPG);
102 hs.add(Registry.SRP_KPG);
103 return Collections.unmodifiableSet(hs);
106 private static IKeyPairGenerator makeInstance(String clazz)
110 Class c = Class.forName(clazz);
111 Constructor ctor = c.getConstructor(new Class[0]);
112 return (IKeyPairGenerator) ctor.newInstance(new Object[0]);
116 throw new IllegalArgumentException(
117 "strong crypto key pair generator not available: " + clazz, x);