mirror of git://gcc.gnu.org/git/gcc.git
305 lines
9.9 KiB
Java
305 lines
9.9 KiB
Java
/* AlgorithmParameters.java --- Algorithm Parameters Implementation Class
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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.io.IOException;
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import java.security.spec.AlgorithmParameterSpec;
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import java.security.spec.InvalidParameterSpecException;
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/**
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* <code>AlgorithmParameters</code> is an Algorithm Parameters class which
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* provides an interface through which the user can manage the parameters of an
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* Algorithm.
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*
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* @author Mark Benvenuto
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* @since 1.2
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* @see AlgorithmParameterSpec
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* @see java.security.spec.DSAParameterSpec
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* @see KeyPairGenerator
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*/
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public class AlgorithmParameters
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{
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/** Service name for algorithm parameters. */
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private static final String ALGORITHM_PARAMETERS = "AlgorithmParameters";
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private AlgorithmParametersSpi paramSpi;
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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>AlgorithmParameters</code>.
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*
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* @param paramSpi
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* the engine 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 AlgorithmParameters(AlgorithmParametersSpi paramSpi,
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Provider provider, String algorithm)
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{
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this.paramSpi = paramSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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}
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/** @return A string with the name of the algorithm used. */
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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 instance of <code>AlgorithmParameters</code> representing
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* the specified algorithm parameters.
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*
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* <p>The returned <code>AlgorithmParameters</code> must still be initialized
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* with an <code>init()</code> method.</p>
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*
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* @param algorithm
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* the algorithm to use.
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* @return the new instance repesenting the desired algorithm.
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* @throws NoSuchAlgorithmException
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* if the algorithm is not implemented by any provider.
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*/
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public static AlgorithmParameters 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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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 e)
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{
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// Ignore this.
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}
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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>AlgorithmParameters</code> representing
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* the specified algorithm parameters from a named provider.
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*
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* <p>The returned <code>AlgorithmParameters</code> must still be intialized
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* with an <code>init()</code> method.</p>
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*
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* @param algorithm
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* the algorithm to use.
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* @param provider
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* the name of the {@link Provider} to use.
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* @return the new instance repesenting the desired algorithm.
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* @throws NoSuchAlgorithmException
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* if the algorithm is not implemented by the named provider.
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* @throws NoSuchProviderException
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* if the named provider was not found.
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* @throws IllegalArgumentException
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* if <code>provider</code> is <code>null</code> or is an empty
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* string.
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*/
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public static AlgorithmParameters getInstance(String algorithm, String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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if (provider == null || provider.length() == 0)
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throw new IllegalArgumentException("Illegal provider");
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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>AlgorithmParameters</code> representing
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* the specified algorithm parameters from the specified {@link Provider}.
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*
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* <p>The returned <code>AlgorithmParameters</code> must still be intialized
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* with an <code>init()</code> method.</p>
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*
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* @param algorithm
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* the algorithm to use.
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* @param provider
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* the {@link Provider} to use.
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* @return the new instance 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
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* if <code>provider</code> is <code>null</code>.
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* @since 1.4
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*/
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public static AlgorithmParameters getInstance(String algorithm,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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if (provider == null)
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throw new IllegalArgumentException("Illegal provider");
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try
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{
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return new AlgorithmParameters((AlgorithmParametersSpi)
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Engine.getInstance(ALGORITHM_PARAMETERS, algorithm, provider),
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provider, algorithm);
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}
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catch (java.lang.reflect.InvocationTargetException ite)
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{
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throw new NoSuchAlgorithmException(algorithm);
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}
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catch (ClassCastException cce)
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{
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throw new NoSuchAlgorithmException(algorithm);
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}
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}
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/** @return the provider of this parameter object. */
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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 the engine with the specified {@link AlgorithmParameterSpec}.
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*
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* @param paramSpec
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* A {@link AlgorithmParameterSpec} to use.
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* @throws InvalidParameterSpecException
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* if <code>paramSpec</code> is invalid.
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*/
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public final void init(AlgorithmParameterSpec paramSpec)
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throws InvalidParameterSpecException
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{
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paramSpi.engineInit(paramSpec);
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}
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/**
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* Initializes the engine with the specified parameters stored in the byte
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* array and decodes them according to the ASN.1 specification. If the ASN.1
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* specification exists then it succeeds otherwise an {@link IOException} is
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* thrown.
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*
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* @param params
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* the parameters to use.
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* @throws IOException
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* if a decoding error occurs.
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*/
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public final void init(byte[]params) throws IOException
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{
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paramSpi.engineInit(params);
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}
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/**
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* Initializes the engine with the specified parameters stored in the byte
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* array and decodes them according to the specified decoding specification.
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* If <code>format</code> is <code>null</code>, then this method decodes the
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* byte array using the ASN.1 specification if it exists, otherwise it throws
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* an {@link IOException}.
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*
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* @param params
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* the parameters to use.
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* @param format
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* the name of decoding format to use.
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* @throws IOException
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* if a decoding error occurs.
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*/
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public final void init(byte[]params, String format) throws IOException
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{
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paramSpi.engineInit(params, format);
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}
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/**
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* Returns a new instance of <code>AlgorithmParameters</code> as a
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* designated parameter specification {@link Class}.
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*
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* @param paramSpec
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* the {@link Class} to use.
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* @return the parameter specification.
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* @throws InvalidParameterSpecException
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* if <code>paramSpec</code> is invalid.
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*/
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public final AlgorithmParameterSpec getParameterSpec(Class paramSpec)
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throws InvalidParameterSpecException
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{
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return paramSpi.engineGetParameterSpec(paramSpec);
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}
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/**
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* Returns the parameters in the default encoding format. The primary encoding
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* format is ASN.1 if it exists for the specified type.
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*
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* @return byte array representing the parameters.
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*/
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public final byte[] getEncoded() throws IOException
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{
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return paramSpi.engineGetEncoded();
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}
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/**
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* Returns the parameters in the specified encoding format. If
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* <code>format</code> is <code>null</code> then the ASN.1 encoding
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* format is used if it exists for the specified type.
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*
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* @param format
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* the name of the encoding format to use.
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* @return the parameters encoded using the specified encoding scheme.
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* @throws IOException
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* if an encoding exception occurs, or if this parameter object has
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* not been initialized.
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*/
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public final byte[] getEncoded(String format) throws IOException
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{
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return paramSpi.engineGetEncoded(format);
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}
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/**
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* Returns a string representation of the encoded form.
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*
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* @return a string representation of the encoded form.
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*/
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public final String toString()
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{
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return paramSpi.engineToString();
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}
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}
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