312 lines
9.9 KiB
Java
312 lines
9.9 KiB
Java
/* KeyPairGenerator.java --- Key Pair Generator Class
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Copyright (C) 1999, 2002, 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package java.security;
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import gnu.java.security.Engine;
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import java.lang.reflect.InvocationTargetException;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* <code>KeyPairGenerator</code> is a class used to generate key-pairs for a
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* security algorithm.
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*
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* <p>The <code>KeyPairGenerator</code> is created with the
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* <code>getInstance()</code> Factory methods. It is used to generate a pair of
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* public and private keys for a specific algorithm and associate this key-pair
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* with the algorithm parameters it was initialized with.</p>
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*
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* @see KeyPair
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* @see AlgorithmParameterSpec
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* @author Mark Benvenuto
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* @author Casey Marshall
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*/
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public abstract class KeyPairGenerator extends KeyPairGeneratorSpi
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{
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/** The service name for key pair generators. */
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private static final String KEY_PAIR_GENERATOR = "KeyPairGenerator";
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Provider provider;
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private String algorithm;
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/**
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* Constructs a new instance of <code>KeyPairGenerator</code>.
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*
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* @param algorithm
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* the algorithm to use.
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*/
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protected KeyPairGenerator(String algorithm)
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{
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this.algorithm = algorithm;
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this.provider = null;
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}
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/**
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* Returns the name of the algorithm used.
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*
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* @return the name of the algorithm used.
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*/
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public String getAlgorithm()
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{
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return algorithm;
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}
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/**
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* Returns a new instance of <code>KeyPairGenerator</code> which generates
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* key-pairs for the specified algorithm.
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*
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* @param algorithm the name of the algorithm to use.
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* @return a new instance repesenting the desired algorithm.
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* @throws NoSuchAlgorithmException if the algorithm is not implemented by any
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* provider.
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* @throws IllegalArgumentException if <code>algorithm</code> is
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* <code>null</code> or is an empty string.
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*/
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public static KeyPairGenerator getInstance(String algorithm)
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throws NoSuchAlgorithmException
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{
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Provider[] p = Security.getProviders();
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NoSuchAlgorithmException lastException = null;
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for (int i = 0; i < p.length; i++)
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try
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{
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return getInstance(algorithm, p[i]);
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}
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catch (NoSuchAlgorithmException x)
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{
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lastException = x;
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}
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if (lastException != null)
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throw lastException;
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throw new NoSuchAlgorithmException(algorithm);
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}
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/**
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* Returns a new instance of <code>KeyPairGenerator</code> which generates
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* key-pairs for the specified algorithm from a named provider.
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*
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* @param algorithm the name of the algorithm to use.
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* @param provider the name of a {@link Provider} to use.
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* @return a new instance repesenting the desired algorithm.
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* @throws NoSuchAlgorithmException if the algorithm is not implemented by the
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* named provider.
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* @throws NoSuchProviderException if the named provider was not found.
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* @throws IllegalArgumentException if either <code>algorithm</code> or
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* <code>provider</code> is <code>null</code> or empty.
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*/
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public static KeyPairGenerator getInstance(String algorithm, String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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if (provider == null)
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throw new IllegalArgumentException("provider MUST NOT be null");
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provider = provider.trim();
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if (provider.length() == 0)
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throw new IllegalArgumentException("provider MUST NOT be empty");
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Provider p = Security.getProvider(provider);
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if (p == null)
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throw new NoSuchProviderException(provider);
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return getInstance(algorithm, p);
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}
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/**
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* Returns a new instance of <code>KeyPairGenerator</code> which generates
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* key-pairs for the specified algorithm from a designated {@link Provider}.
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*
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* @param algorithm
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* the name of the algorithm to use.
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* @param provider
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* the {@link Provider} to use.
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* @return a new insatnce repesenting the desired algorithm.
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* @throws NoSuchAlgorithmException
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* if the algorithm is not implemented by the {@link Provider}.
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* @throws IllegalArgumentException if either <code>algorithm</code> or
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* <code>provider</code> is <code>null</code>, or if
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* <code>algorithm</code> is an empty string.
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* @since 1.4
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* @see Provider
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*/
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public static KeyPairGenerator getInstance(String algorithm,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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StringBuilder sb = new StringBuilder("KeyPairGenerator for algorithm [")
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.append(algorithm).append("] from provider[")
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.append(provider).append("] ");
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Object o;
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try
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{
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o = Engine.getInstance(KEY_PAIR_GENERATOR, algorithm, provider);
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}
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catch (InvocationTargetException x)
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{
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Throwable cause = x.getCause();
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if (cause instanceof NoSuchAlgorithmException)
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throw (NoSuchAlgorithmException) cause;
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if (cause == null)
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cause = x;
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sb.append("could not be created");
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NoSuchAlgorithmException y = new NoSuchAlgorithmException(sb.toString());
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y.initCause(cause);
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throw y;
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}
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KeyPairGenerator result;
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if (o instanceof KeyPairGenerator)
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{
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result = (KeyPairGenerator) o;
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result.algorithm = algorithm;
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}
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else if (o instanceof KeyPairGeneratorSpi)
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result = new DummyKeyPairGenerator((KeyPairGeneratorSpi) o, algorithm);
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else
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{
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sb.append("is of an unexpected Type: ").append(o.getClass().getName());
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throw new NoSuchAlgorithmException(sb.toString());
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}
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result.provider = provider;
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return result;
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}
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/**
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* Returns the {@link Provider} of this instance.
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*
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* @return the {@link Provider} of this instance.
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*/
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public final Provider getProvider()
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{
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return provider;
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}
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/**
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* Initializes this instance for the specified key size. Since no source of
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* randomness is specified, a default one will be used.
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*
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* @param keysize
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* the size of keys to use.
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*/
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public void initialize(int keysize)
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{
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initialize(keysize, new SecureRandom());
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}
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/**
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* Initializes this instance for the specified key size and
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* {@link SecureRandom}.
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*
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* @param keysize
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* the size of keys to use.
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* @param random
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* the {@link SecureRandom} to use.
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* @since 1.2
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*/
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public void initialize(int keysize, SecureRandom random)
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{
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}
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/**
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* Initializes this instance with the specified
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* {@link AlgorithmParameterSpec}. Since no source of randomness is specified,
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* a default one will be used.
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*
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* @param params
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* the {@link AlgorithmParameterSpec} to use.
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* @throws InvalidAlgorithmParameterException
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* if the designated specifications are invalid.
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* @since 1.2
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*/
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public void initialize(AlgorithmParameterSpec params)
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throws InvalidAlgorithmParameterException
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{
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initialize(params, new SecureRandom());
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}
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/**
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* Initializes this instance with the specified {@link AlgorithmParameterSpec}
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* and {@link SecureRandom}.
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*
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* @param params
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* the {@link AlgorithmParameterSpec} to use.
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* @param random
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* the {@link SecureRandom} to use.
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* @throws InvalidAlgorithmParameterException
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* if the designated specifications are invalid.
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* @since 1.2
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*/
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public void initialize(AlgorithmParameterSpec params, SecureRandom random)
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throws InvalidAlgorithmParameterException
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{
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super.initialize(params, random);
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}
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/**
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* Generates a new "DSA" {@link KeyPair} from the "GNU" security provider.
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*
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* <p>This method generates a unique key-pair each time it is called.</p>
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*
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* @return a new unique {@link KeyPair}.
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* @see #generateKeyPair()
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* @since 1.2
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*/
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public final KeyPair genKeyPair()
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{
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try
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{
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return getInstance("DSA", "GNU").generateKeyPair();
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}
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catch (Exception e)
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{
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System.err.println("genKeyPair failed: " + e);
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e.printStackTrace();
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return null;
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}
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}
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/**
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* Generates a new "DSA" {@link KeyPair} from the "GNU" security provider.
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*
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* <p>This method generates a unique key pair each time it is called.</p>
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*
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* @return a new unique {@link KeyPair}.
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* @see #genKeyPair()
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*/
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public KeyPair generateKeyPair()
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{
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return genKeyPair();
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}
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}
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