| /* KeyPairGenerator.java --- Key Pair Generator Class |
| Copyright (C) 1999, 2002 Free Software Foundation, Inc. |
| |
| This file is 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, 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; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 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 java.security; |
| |
| import java.security.spec.AlgorithmParameterSpec; |
| |
| /** |
| KeyPairGenerator is the class used to generate key pairs |
| for a security algorithm. |
| |
| The KeyPairGenerator is created with the getInstance() |
| methods. The class is used to generate public and private |
| keys for an algorithm and associate it with |
| algorithm parameters. |
| |
| @author Mark Benvenuto |
| */ |
| public abstract class KeyPairGenerator extends KeyPairGeneratorSpi |
| { |
| Provider provider; |
| private String algorithm; |
| |
| /** |
| Constructs a new KeyPairGenerator |
| |
| @param algorithm the algorithm to use |
| */ |
| protected KeyPairGenerator(String algorithm) |
| { |
| this.algorithm = algorithm; |
| this.provider = null; |
| } |
| |
| /** |
| Returns the name of the algorithm used |
| |
| @return A string with the name of the algorithm |
| */ |
| public String getAlgorithm() |
| { |
| return algorithm; |
| } |
| |
| /** |
| Gets an instance of the KeyPairGenerator class |
| which generates key pairs for the specified algorithm. |
| If the algorithm is not found then, it throws NoSuchAlgorithmException. |
| |
| @param algorithm the name of algorithm to choose |
| @return a AlgorithmParameterGenerator repesenting the desired algorithm |
| |
| @throws NoSuchAlgorithmException if the algorithm is not implemented by |
| providers |
| */ |
| public static KeyPairGenerator getInstance(String algorithm) throws |
| NoSuchAlgorithmException |
| { |
| Provider[] p = Security.getProviders(); |
| |
| for (int i = 0; i < p.length; i++) |
| { |
| try |
| { |
| return getInstance(algorithm, p[i]); |
| } |
| catch (NoSuchAlgorithmException ignored) {} |
| } |
| |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| |
| /** |
| Gets an instance of the KeyPairGenerator class |
| which generates key pairs for the specified algorithm. |
| If the algorithm is not found then, it throws NoSuchAlgorithmException. |
| |
| @param algorithm the name of algorithm to choose |
| @param provider the name of the provider to find the algorithm in |
| @return a AlgorithmParameterGenerator repesenting the desired algorithm |
| |
| @throws NoSuchAlgorithmException if the algorithm is not implemented by |
| the provider |
| @throws NoSuchProviderException if the provider is not found |
| */ |
| public static KeyPairGenerator getInstance(String algorithm, String provider) |
| throws NoSuchAlgorithmException, NoSuchProviderException |
| { |
| Provider p = Security.getProvider(provider); |
| if (p == null) |
| throw new NoSuchProviderException(provider); |
| |
| return getInstance(algorithm, p); |
| } |
| |
| private static KeyPairGenerator getInstance(String algorithm, Provider p) |
| throws NoSuchAlgorithmException |
| { |
| // try the name as is |
| String className = p.getProperty("KeyPairGenerator." + algorithm); |
| if (className == null) { // try all uppercase |
| String upper = algorithm.toUpperCase(); |
| className = p.getProperty("KeyPairGenerator." + upper); |
| if (className == null) { // try if it's an alias |
| String alias = p.getProperty("Alg.Alias.KeyPairGenerator." + algorithm); |
| if (alias == null) { // try all-uppercase alias name |
| alias = p.getProperty("Alg.Alias.KeyPairGenerator." + upper); |
| if (alias == null) { // spit the dummy |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| } |
| className = p.getProperty("KeyPairGenerator." + alias); |
| if (className == null) { |
| throw new NoSuchAlgorithmException(algorithm); |
| } |
| } |
| } |
| return getInstance(className, algorithm, p); |
| } |
| |
| private static KeyPairGenerator getInstance(String classname, |
| String algorithm, |
| Provider provider) |
| throws NoSuchAlgorithmException |
| { |
| try |
| { |
| Object o = Class.forName(classname).newInstance(); |
| KeyPairGenerator kpg; |
| if (o instanceof KeyPairGeneratorSpi) |
| kpg = new DummyKeyPairGenerator((KeyPairGeneratorSpi) o, algorithm); |
| else |
| { |
| kpg = (KeyPairGenerator) o; |
| kpg.algorithm = algorithm; |
| } |
| |
| kpg.provider = provider; |
| return kpg; |
| } |
| catch (ClassNotFoundException cnfe) |
| { |
| throw new NoSuchAlgorithmException("Class not found"); |
| } |
| catch (InstantiationException ie) |
| { |
| throw new NoSuchAlgorithmException("Class instantiation failed"); |
| } |
| catch (IllegalAccessException iae) |
| { |
| throw new NoSuchAlgorithmException("Illegal Access"); |
| } |
| } |
| |
| /** |
| Gets the provider that the class is from. |
| |
| @return the provider of this class |
| */ |
| public final Provider getProvider() |
| { |
| return provider; |
| } |
| |
| /** |
| Initializes the KeyPairGenerator for the specified key size. |
| (Since no source of randomness is specified, a default one is |
| provided.) |
| |
| @param keysize Size of key to generate |
| */ |
| public void initialize(int keysize) |
| { |
| initialize(keysize, new SecureRandom()); |
| } |
| |
| /** |
| Initializes the KeyPairGenerator for the specified key size |
| and specified SecureRandom. |
| |
| @param keysize Size of key to generate |
| @param random SecureRandom to use |
| |
| @since JDK 1.2 |
| */ |
| public void initialize(int keysize, SecureRandom random) |
| { |
| initialize(keysize, random); |
| } |
| |
| /** |
| Initializes the KeyPairGenerator with the specified |
| AlgorithmParameterSpec class. |
| (Since no source of randomness is specified, a default one is |
| provided.) |
| |
| @param params AlgorithmParameterSpec to initialize with |
| |
| @since JDK 1.2 |
| */ |
| public void initialize(AlgorithmParameterSpec params) |
| throws InvalidAlgorithmParameterException |
| { |
| initialize(params, new SecureRandom()); |
| } |
| |
| /** |
| Initializes the KeyPairGenerator with the specified |
| AlgorithmParameterSpec class and specified SecureRandom. |
| |
| @param params AlgorithmParameterSpec to initialize with |
| @param random SecureRandom to use |
| |
| @since JDK 1.2 |
| */ |
| public void initialize(AlgorithmParameterSpec params, SecureRandom random) |
| throws InvalidAlgorithmParameterException |
| { |
| super.initialize(params, random); |
| } |
| |
| /** |
| Generates a KeyPair according the rules for the algorithm. |
| Unless intialized, algorithm defaults will be used. It |
| creates a unique key pair each time. |
| |
| Same as generateKeyPair(); |
| |
| @return a key pair |
| */ |
| public final KeyPair genKeyPair() |
| { |
| try |
| { |
| return getInstance("DSA", "GNU").generateKeyPair(); |
| } |
| catch (Exception e) |
| { |
| System.err.println("genKeyPair failed: " + e); |
| e.printStackTrace(); |
| return null; |
| } |
| } |
| |
| /** |
| Generates a KeyPair according the rules for the algorithm. |
| Unless intialized, algorithm defaults will be used. It |
| creates a unique key pair each time. |
| |
| Same as genKeyPair(); |
| |
| @return a key pair |
| */ |
| public KeyPair generateKeyPair() |
| { |
| return genKeyPair(); |
| } |
| } |