276 lines
9.4 KiB
Java
276 lines
9.4 KiB
Java
/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator
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Copyright (C) 1999, 2003, 2004 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>AlgorithmParameterGenerator</code> is used to generate algorithm
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* parameters for specified algorithms.
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*
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* <p>In case the client does not explicitly initialize the
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* <code>AlgorithmParameterGenerator</code> (via a call to an
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* <code>init()</code> method), each provider must supply (and document) a
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* default initialization. For example, the <b>GNU</b> provider uses a default
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* modulus prime size of <code>1024</code> bits for the generation of <i>DSA</i>
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* parameters.
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*
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* @author Mark Benvenuto
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* @since 1.2
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* @see AlgorithmParameters
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* @see AlgorithmParameterSpec
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*/
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public class AlgorithmParameterGenerator
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{
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/** Service name for algorithm parameter generators. */
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private static final String ALGORITHM_PARAMETER_GENERATOR =
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"AlgorithmParameterGenerator";
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private AlgorithmParameterGeneratorSpi paramGenSpi;
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private Provider provider;
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private String algorithm;
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/**
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* Constructs a new instance of <code>AlgorithmParameterGenerator</code>.
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*
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* @param paramGenSpi
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* the generator to use.
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* @param provider
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* the provider to use.
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* @param algorithm
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* the algorithm to use.
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*/
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protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi
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paramGenSpi, Provider provider,
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String algorithm)
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{
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this.paramGenSpi = paramGenSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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}
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/** @return the name of the algorithm. */
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public final 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 <code>AlgorithmParameterGenerator</code> instance which
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* generates algorithm parameters for the specified algorithm.
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*
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* @param algorithm the name of algorithm to use.
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* @return the new instance.
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* @throws NoSuchAlgorithmException if <code>algorithm</code> is not
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* implemented by any 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 AlgorithmParameterGenerator 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 <code>AlgorithmParameterGenerator</code> instance which
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* generates algorithm parameters for the specified algorithm.
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*
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* @param algorithm the name of algorithm to use.
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* @param provider the name of the {@link Provider} to use.
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* @return the new instance.
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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 AlgorithmParameterGenerator getInstance(String algorithm,
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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 <code>AlgorithmParameterGenerator</code> instance which
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* generates algorithm parameters for the specified algorithm.
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*
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* @param algorithm the name of algorithm to use.
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* @param provider the {@link Provider} to use.
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* @return the new instance.
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* @throws NoSuchAlgorithmException if the algorithm is not implemented by
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* {@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 AlgorithmParameterGenerator 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()
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.append("AlgorithmParameterGenerator for algorithm [")
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.append(algorithm).append("] from provider[")
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.append(provider).append("] could not be created");
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Throwable cause;
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try
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{
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Object spi = Engine.getInstance(ALGORITHM_PARAMETER_GENERATOR,
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algorithm,
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provider);
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return new AlgorithmParameterGenerator((AlgorithmParameterGeneratorSpi) spi,
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provider,
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algorithm);
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}
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catch (InvocationTargetException x)
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{
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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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}
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catch (ClassCastException x)
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{
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cause = x;
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}
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NoSuchAlgorithmException x = new NoSuchAlgorithmException(sb.toString());
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x.initCause(cause);
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throw x;
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}
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/** @return the {@link Provider} of this generator. */
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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 with the specified size. Since no source of
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* randomness is supplied, a default one will be used.
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*
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* @param size
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* size (in bits) to use.
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*/
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public final void init(int size)
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{
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init(size, new SecureRandom());
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}
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/**
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* Initializes this instance with the specified key-size and source of
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* randomness.
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*
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* @param size
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* the size (in bits) to use.
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* @param random
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* the {@link SecureRandom} to use.
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*/
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public final void init(int size, SecureRandom random)
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{
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paramGenSpi.engineInit(size, random);
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}
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/**
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* Initializes this instance with the specified {@link AlgorithmParameterSpec}.
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* Since no source of randomness is supplied, a default one will be used.
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*
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* @param genParamSpec
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* the {@link AlgorithmParameterSpec} to use.
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* @throws InvalidAlgorithmParameterException
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* if <code>genParamSpec</code> is invalid.
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*/
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public final void init(AlgorithmParameterSpec genParamSpec)
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throws InvalidAlgorithmParameterException
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{
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init(genParamSpec, 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 source of randomness.
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*
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* @param genParamSpec
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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 <code>genParamSpec</code> is invalid.
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*/
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public final void init(AlgorithmParameterSpec genParamSpec,
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SecureRandom random)
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throws InvalidAlgorithmParameterException
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{
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paramGenSpi.engineInit(genParamSpec, random);
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}
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/** @return a new instance of {@link AlgorithmParameters}. */
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public final AlgorithmParameters generateParameters()
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{
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return paramGenSpi.engineGenerateParameters();
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}
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}
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