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281 lines
9.2 KiB
Java
281 lines
9.2 KiB
Java
/* KeyFactory.java --- Key Factory 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.lang.CPStringBuilder;
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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.InvalidKeySpecException;
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import java.security.spec.KeySpec;
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/**
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* Key factories are used to convert keys (opaque cryptographic keys of type
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* {@link Key}) into key specifications (transparent representations of the
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* underlying key material).
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*
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* <p>Key factories are bi-directional. They allow a key class to be converted
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* into a key specification (key material) and back again. For example DSA
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* public keys can be specified as <code>DSAPublicKeySpec</code> or
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* <code>X509EncodedKeySpec</code>. A key factory translates these key
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* specifications.</p>
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*
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* @since 1.2
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* @see Key
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* @see KeySpec
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* @see java.security.spec.DSAPublicKeySpec
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* @see java.security.spec.X509EncodedKeySpec
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@author Mark Benvenuto
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*/
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public class KeyFactory
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{
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/** The service name for key factories. */
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private static final String KEY_FACTORY = "KeyFactory";
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private KeyFactorySpi keyFacSpi;
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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>KeyFactory</code> with the specified
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* parameters.
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*
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* @param keyFacSpi
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* the key factory 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 name of the key algorithm to use.
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*/
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protected KeyFactory(KeyFactorySpi keyFacSpi, Provider provider,
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String algorithm)
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{
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this.keyFacSpi = keyFacSpi;
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this.provider = provider;
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this.algorithm = algorithm;
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}
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/**
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* Returns a new instance of <code>KeyFactory</code> representing the
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* specified key factory.
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*
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* @param algorithm the name of 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 KeyFactory 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>KeyFactory</code> representing the
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* specified key factory from the specified provider.
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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 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 KeyFactory 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>KeyFactory</code> representing the
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* specified key factory from the designated {@link Provider}.
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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 a new instance repesenting the desired algorithm.
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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 KeyFactory getInstance(String algorithm, Provider provider)
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throws NoSuchAlgorithmException
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{
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CPStringBuilder sb = new CPStringBuilder("KeyFactory 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(KEY_FACTORY, algorithm, provider);
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return new KeyFactory((KeyFactorySpi) spi, provider, 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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/**
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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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* 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 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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* Generates a public key from the provided key specification.
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*
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* @param keySpec
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* the key specification.
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* @return the public key.
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* @throws InvalidKeySpecException
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* if the key specification is invalid.
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*/
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public final PublicKey generatePublic(KeySpec keySpec)
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throws InvalidKeySpecException
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{
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return keyFacSpi.engineGeneratePublic(keySpec);
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}
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/**
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* Generates a private key from the provided key specification.
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*
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* @param keySpec
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* the key specification.
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* @return the private key.
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* @throws InvalidKeySpecException
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* if the key specification is invalid.
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*/
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public final PrivateKey generatePrivate(KeySpec keySpec)
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throws InvalidKeySpecException
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{
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return keyFacSpi.engineGeneratePrivate(keySpec);
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}
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/**
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* Returns a key specification for the given key. <code>keySpec</code>
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* identifies the specification class to return the key material in.
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*
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* @param key
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* the key to use.
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* @param keySpec
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* the specification class to use.
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* @return the key specification in an instance of the requested specification
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* class.
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* @throws InvalidKeySpecException
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* the requested key specification is inappropriate for this key or
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* the key is unrecognized.
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*/
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public final <T extends KeySpec> T getKeySpec(Key key, Class<T> keySpec)
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throws InvalidKeySpecException
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{
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return keyFacSpi.engineGetKeySpec(key, keySpec);
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}
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/**
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* Translates the key from an unknown or untrusted provider into a key from
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* this key factory.
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*
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* @param key
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* the key to translate from.
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* @return the translated key.
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* @throws InvalidKeyException
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* if the key cannot be processed by this key factory.
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*/
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public final Key translateKey(Key key) throws InvalidKeyException
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{
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return keyFacSpi.engineTranslateKey(key);
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}
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}
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