mirror of
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343 lines
13 KiB
Java
343 lines
13 KiB
Java
/*
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* This file is modified by Ivan Maidanski <ivmai@ivmaisoft.com>
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* Project name: JCGO (http://www.ivmaisoft.com/jcgo/)
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* Class root location: $(JCGO)/goclsp/clsp_fix
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* Origin: GNU Classpath v0.93
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*/
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/* Engine -- generic getInstance method.
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Copyright (C) 2003, 2006 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 gnu.java.security;
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import java.lang.reflect.Constructor;
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import java.lang.reflect.InvocationTargetException;
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import java.security.NoSuchAlgorithmException;
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import java.security.Provider;
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import java.util.Enumeration;
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/**
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* Generic implementation of the getInstance methods in the various
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* engine classes in java.security.
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* <p>
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* These classes ({@link java.security.Signature} for example) can be
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* thought of as the "chrome, upholstery, and steering wheel", and the SPI
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* (service provider interface, e.g. {@link java.security.SignatureSpi})
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* classes can be thought of as the "engine" -- providing the actual
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* functionality of whatever cryptographic algorithm the instance
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* represents.
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*
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* @see Provider
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* @author Casey Marshall
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*/
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public final class Engine
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{
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// Constants.
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// ------------------------------------------------------------------------
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/** Prefix for aliases. */
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private static final String ALG_ALIAS = "Alg.Alias.";
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/** Maximum number of aliases to try. */
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private static final int MAX_ALIASES = 5;
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// Constructor.
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// ------------------------------------------------------------------------
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/** This class cannot be instantiated. */
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private Engine() { }
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/**
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* Return the implementation for <i>algorithm</i> for service <i>service</i>
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* from <i>provider</i>. The service is e.g. "Signature", and the algorithm
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* "DSA".
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*
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* @param service The service name.
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* @param algorithm The name of the algorithm to get.
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* @param provider The provider to get the implementation from.
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* @return The engine class for the specified algorithm; the object returned
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* is typically a subclass of the SPI class for that service, but
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* callers should check that this is so.
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* @throws NoSuchAlgorithmException If the implementation cannot be found or
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* cannot be instantiated.
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* @throws InvocationTargetException If the SPI class's constructor throws an
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* exception.
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* @throws IllegalArgumentException If any of the three arguments is null.
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*/
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public static Object getInstance(String service, String algorithm,
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Provider provider)
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throws InvocationTargetException, NoSuchAlgorithmException
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{
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Class clazz = getInstanceClass(service, algorithm, provider);
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String msg;
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Throwable cause;
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try
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{
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return clazz.getConstructor(null).newInstance(null);
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}
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catch (IllegalAccessException x)
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{
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msg = "cannot be accessed";
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cause = x;
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}
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catch (InstantiationException x)
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{
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msg = "cannot be instantiated";
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cause = x;
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}
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catch (ExceptionInInitializerError x)
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{
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msg = "cannot be initialized";
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cause = x;
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}
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catch (SecurityException x)
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{
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msg = "caused a security violation";
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cause = x;
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}
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catch (NoSuchMethodException x)
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{
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msg = "does not have/expose an appropriate constructor";
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cause = x;
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}
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StringBuilder sb = new StringBuilder();
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sb.append("Class [").append(clazz.getName()).append("] for algorithm [")
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.append(algorithm).append("] of type [").append(service)
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.append("] from provider [").append(provider).append("] ");
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sb.append(msg);
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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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* Return the implementation for <i>algorithm</i> for service <i>service</i>
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* from <i>provider</i>, passing <i>initArgs</i> to the SPI class's
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* constructor (which cannot be null; pass a zero-length array if the SPI
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* takes no arguments). The service is e.g. "Signature", and the algorithm
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* "DSA".
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*
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* @param service The service name.
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* @param algorithm The name of the algorithm to get.
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* @param provider The provider to get the implementation from.
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* @param initArgs The arguments to pass to the SPI class's constructor
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* (cannot be null).
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* @return The engine class for the specified algorithm; the object returned
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* is typically a subclass of the SPI class for that service, but
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* callers should check that this is so.
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* @throws NoSuchAlgorithmException If the implementation cannot be found or
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* cannot be instantiated.
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* @throws InvocationTargetException If the SPI class's constructor throws an
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* exception.
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* @throws IllegalArgumentException If any of the four arguments is
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* <code>null</code> or if either <code>service</code>, or
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* <code>algorithm</code> is an empty string.
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*/
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public static Object getInstance(String service, String algorithm,
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Provider provider, Object[] initArgs)
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throws InvocationTargetException, NoSuchAlgorithmException
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{
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if (initArgs == null)
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throw new IllegalArgumentException("Constructor's parameters MUST NOT be null");
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Class clazz = getInstanceClass(service, algorithm, provider);
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String msg;
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Throwable cause;
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try
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{
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Constructor constructor = getCompatibleConstructor(clazz, initArgs);
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return constructor.newInstance(initArgs);
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}
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catch (IllegalAccessException x)
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{
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msg = "cannot be accessed";
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cause = x;
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}
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catch (InstantiationException x)
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{
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msg = "cannot be instantiated";
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cause = x;
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}
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catch (ExceptionInInitializerError x)
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{
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msg = "cannot be initialized";
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cause = x;
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}
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catch (SecurityException x)
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{
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msg = "caused a security violation";
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cause = x;
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}
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catch (NoSuchMethodException x)
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{
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msg = "does not have/expose an appropriate constructor";
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cause = x;
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}
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StringBuilder sb = new StringBuilder();
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sb.append("Class [").append(clazz.getName()).append("] for algorithm [")
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.append(algorithm).append("] of type [").append(service)
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.append("] from provider [").append(provider).append("] ");
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sb.append(msg);
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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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private static Class getInstanceClass(String service, String algorithm,
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Provider provider)
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throws NoSuchAlgorithmException
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{
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if (service == null)
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throw new IllegalArgumentException("service MUST NOT be null");
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service = service.trim();
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if (service.length() == 0)
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throw new IllegalArgumentException("service MUST NOT be empty");
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if (algorithm == null)
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throw new IllegalArgumentException("algorithm MUST NOT be null");
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algorithm = algorithm.trim();
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if (algorithm.length() == 0)
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throw new IllegalArgumentException("algorithm MUST NOT be empty");
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if (provider == null)
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throw new IllegalArgumentException("provider MUST NOT be null");
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Enumeration enumer = provider.propertyNames();
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String key;
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String alias;
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int count = 0;
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boolean algorithmFound = false;
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while (enumer.hasMoreElements())
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{
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key = (String) enumer.nextElement();
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if (key.equalsIgnoreCase(service + "." + algorithm))
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{
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// remove the service portion from the key
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algorithm = key.substring(service.length() + 1);
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algorithmFound = true;
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break;
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}
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else if (key.equalsIgnoreCase(ALG_ALIAS + service + "." + algorithm))
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{
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alias = (String) provider.getProperty(key);
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if (! algorithm.equalsIgnoreCase(alias)) // does not refer to itself
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{
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algorithm = alias;
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if (count++ > MAX_ALIASES)
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{
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StringBuilder sb = new StringBuilder();
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sb.append("Algorithm [").append(algorithm)
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.append("] of type [").append(service)
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.append("] from provider [").append(provider)
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.append("] has too many aliases");
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throw new NoSuchAlgorithmException(sb.toString());
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}
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// need to reset enumeration to now look for the alias
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enumer = provider.propertyNames();
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}
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}
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}
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if (! algorithmFound)
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{
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StringBuilder sb = new StringBuilder();
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sb.append("Algorithm [").append(algorithm).append("] of type [")
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.append(service).append("] from provider [")
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.append(provider).append("] is not found");
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throw new NoSuchAlgorithmException(sb.toString());
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}
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// Find and instantiate the implementation
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Class clazz;
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ClassLoader loader = provider.getClass().getClassLoader();
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String className = provider.getProperty(service + "." + algorithm);
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try
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{
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if (loader != null)
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clazz = loader.loadClass(className);
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else
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clazz = Class.forName(className);
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}
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catch (ClassNotFoundException cause)
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{
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StringBuilder sb = new StringBuilder();
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sb.append("Class [").append(className).append("] for algorithm [")
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.append(algorithm).append("] of type [").append(service)
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.append("] from provider [").append(provider).append("] ");
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sb.append("cannot not be found");
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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 clazz;
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}
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/**
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* Find a constructor in the given class that can take the specified
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* argument list, allowing any of which to be null.
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*
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* @param clazz The class from which to get the constructor.
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* @param initArgs The argument list to be passed to the constructor.
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* @return The constructor.
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* @throws NoSuchMethodException If no constructor of the given class
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* can take the specified argument array.
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*/
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private static Constructor getCompatibleConstructor(Class clazz,
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Object[] initArgs)
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throws NoSuchMethodException
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{
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Constructor[] c = clazz.getConstructors();
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outer:for (int i = 0; i < c.length; i++)
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{
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Class[] argTypes = c[i].getParameterTypes();
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if (argTypes.length != initArgs.length)
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continue;
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for (int j = 0; j < argTypes.length; j++)
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{
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if (initArgs[j] != null &&
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!argTypes[j].isAssignableFrom(initArgs[j].getClass()))
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continue outer;
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}
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// If we reach this point, we know this constructor (c[i]) has
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// the same number of parameters as the target parameter list,
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// and all our parameters are either (1) null, or (2) assignable
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// to the target parameter type.
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return c[i];
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}
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throw new NoSuchMethodException();
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}
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}
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