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jlechner |
/* ExemptionMechanism.java -- Generic crypto-weakening mechanism.
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Copyright (C) 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 javax.crypto;
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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.AlgorithmParameters;
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import java.security.InvalidAlgorithmParameterException;
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import java.security.InvalidKeyException;
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import java.security.Key;
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import java.security.NoSuchAlgorithmException;
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import java.security.NoSuchProviderException;
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import java.security.Provider;
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import java.security.Security;
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import java.security.spec.AlgorithmParameterSpec;
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/**
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* An exemption mechanism, which will conditionally allow cryptography
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* where it is not normally allowed, implements things such as <i>key
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* recovery</i>, <i>key weakening</i>, or <i>key escrow</i>.
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*
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* <p><b>Implementation note</b>: this class is present for
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* API-compatibility only; it is not actually used anywhere in this library
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* and this library does not, in general, support crypto weakening.
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*
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* @author Casey Marshall (csm@gnu.org)
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* @since 1.4
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*/
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public class ExemptionMechanism
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{
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// Constants and fields.
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// ------------------------------------------------------------------------
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private static final String SERVICE = "ExemptionMechanism";
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private ExemptionMechanismSpi emSpi;
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private Provider provider;
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private String mechanism;
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private boolean virgin;
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// Constructor.
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// ------------------------------------------------------------------------
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protected ExemptionMechanism(ExemptionMechanismSpi emSpi, Provider provider,
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String mechanism)
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{
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this.emSpi = emSpi;
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this.provider = provider;
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this.mechanism = mechanism;
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virgin = true;
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}
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// Class methods.
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// ------------------------------------------------------------------------
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public static final ExemptionMechanism getInstance(String mechanism)
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throws NoSuchAlgorithmException
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{
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Provider[] provs = Security.getProviders();
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String msg = "";
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for (int i = 0; i < provs.length; i++)
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{
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try
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{
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return getInstance(mechanism, provs[i]);
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}
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catch (NoSuchAlgorithmException nsae)
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{
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msg = nsae.getMessage();
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}
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}
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throw new NoSuchAlgorithmException(msg);
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}
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public static final ExemptionMechanism getInstance(String mechanism,
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String provider)
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throws NoSuchAlgorithmException, NoSuchProviderException
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{
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Provider p = Security.getProvider(provider);
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if (p == null)
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{
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throw new NoSuchProviderException(provider);
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}
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return getInstance(mechanism, p);
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}
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public static final ExemptionMechanism getInstance(String mechanism,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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try
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{
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return new ExemptionMechanism((ExemptionMechanismSpi)
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Engine.getInstance(SERVICE, mechanism, provider),
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provider, mechanism);
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}
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catch (InvocationTargetException ite)
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{
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if (ite.getCause() instanceof NoSuchAlgorithmException)
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throw (NoSuchAlgorithmException) ite.getCause();
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else
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throw new NoSuchAlgorithmException(mechanism);
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}
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catch (ClassCastException cce)
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{
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throw new NoSuchAlgorithmException(mechanism);
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}
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}
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// Instance methods.
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// ------------------------------------------------------------------------
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public final byte[] genExemptionBlob()
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throws IllegalStateException, ExemptionMechanismException
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{
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if (virgin)
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{
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throw new IllegalStateException("not initialized");
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}
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return emSpi.engineGenExemptionBlob();
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}
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public final int genExemptionBlob(byte[] output)
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throws IllegalStateException, ExemptionMechanismException,
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ShortBufferException
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{
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return genExemptionBlob(output, 0);
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}
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public final int genExemptionBlob(byte[] output, int outputOffset)
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throws IllegalStateException, ExemptionMechanismException,
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ShortBufferException
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{
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if (virgin)
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{
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throw new IllegalStateException("not initialized");
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}
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return emSpi.engineGenExemptionBlob(output, outputOffset);
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}
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public final String getName()
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{
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return mechanism;
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}
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public final int getOutputSize(int inputLength) throws IllegalStateException
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{
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if (virgin)
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{
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throw new IllegalStateException("not initialized");
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}
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return emSpi.engineGetOutputSize(inputLength);
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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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public final void init(Key key)
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throws ExemptionMechanismException, InvalidKeyException
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{
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emSpi.engineInit(key);
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virgin = false;
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}
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public final void init(Key key, AlgorithmParameters params)
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throws ExemptionMechanismException, InvalidAlgorithmParameterException,
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InvalidKeyException
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{
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emSpi.engineInit(key, params);
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virgin = false;
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}
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public final void init(Key key, AlgorithmParameterSpec params)
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throws ExemptionMechanismException, InvalidAlgorithmParameterException,
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InvalidKeyException
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{
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emSpi.engineInit(key, params);
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virgin = false;
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}
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public final boolean isCryptoAllowed(Key key)
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throws ExemptionMechanismException
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{
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return true;
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}
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protected void finalize()
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{
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}
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}
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