[kaffe] CVS kaffe (robilad): Replaced AlgorithmParameterGenerator by implementation from GNU Classpath

Kaffe CVS cvs-commits at kaffe.org
Fri Sep 24 12:10:37 PDT 2004


PatchSet 5217 
Date: 2004/09/24 19:06:41
Author: robilad
Branch: HEAD
Tag: (none) 
Log:
Replaced AlgorithmParameterGenerator by implementation from GNU Classpath

2004-09-23  Dalibor Topic  <robilad at kaffe.org>

        * libraries/javalib/java/security/AlgorithmParameterGenerator.java:
        Replaced by implementation from GNU Classpath.

Members: 
	ChangeLog:1.2772->1.2773 
	libraries/javalib/java/security/AlgorithmParameterGenerator.java:1.2->1.3 

Index: kaffe/ChangeLog
diff -u kaffe/ChangeLog:1.2772 kaffe/ChangeLog:1.2773
--- kaffe/ChangeLog:1.2772	Fri Sep 24 18:49:11 2004
+++ kaffe/ChangeLog	Fri Sep 24 19:06:41 2004
@@ -1,5 +1,10 @@
 2004-09-23  Dalibor Topic  <robilad at kaffe.org>
 
+	* libraries/javalib/java/security/AlgorithmParameterGenerator.java:
+        Replaced by implementation from GNU Classpath.
+
+2004-09-23  Dalibor Topic  <robilad at kaffe.org>
+
 	* libraries/javalib/java/security/AlgorithmParameters.java:
         Replaced by implementation from GNU Classpath.
 
Index: kaffe/libraries/javalib/java/security/AlgorithmParameterGenerator.java
diff -u kaffe/libraries/javalib/java/security/AlgorithmParameterGenerator.java:1.2 kaffe/libraries/javalib/java/security/AlgorithmParameterGenerator.java:1.3
--- kaffe/libraries/javalib/java/security/AlgorithmParameterGenerator.java:1.2	Thu Feb 20 13:52:09 2003
+++ kaffe/libraries/javalib/java/security/AlgorithmParameterGenerator.java	Fri Sep 24 19:06:44 2004
@@ -1,102 +1,298 @@
-/*
- * AlgorithmParameterGenerator.java
- *
- * Copyright (c) 2001, 2003 University of Utah and the Flux Group.
- * All rights reserved.
- *
- * This file is licensed under the terms of the GNU Public License.
- * See the file "license.terms" for information on usage and redistribution
- * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
- *
- * Contributed by the Flux Research Group, Department of Computer Science,
- * University of Utah, http://www.cs.utah.edu/flux/
- */
+/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator
+   Copyright (C) 1999, 2003 Free Software Foundation, Inc.
+
+This file is part of GNU Classpath.
+
+GNU Classpath is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2, or (at your option)
+any later version.
+
+GNU Classpath is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GNU Classpath; see the file COPYING.  If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 USA.
+
+Linking this library statically or dynamically with other modules is
+making a combined work based on this library.  Thus, the terms and
+conditions of the GNU General Public License cover the whole
+combination.
+
+As a special exception, the copyright holders of this library give you
+permission to link this library with independent modules to produce an
+executable, regardless of the license terms of these independent
+modules, and to copy and distribute the resulting executable under
+terms of your choice, provided that you also meet, for each linked
+independent module, the terms and conditions of the license of that
+module.  An independent module is a module which is not derived from
+or based on this library.  If you modify this library, you may extend
+this exception to your version of the library, but you are not
+obligated to do so.  If you do not wish to do so, delete this
+exception statement from your version. */
 
 package java.security;
 
 import java.security.spec.AlgorithmParameterSpec;
 
+import gnu.java.security.Engine;
+
+/**
+ * <p>The <code>AlgorithmParameterGenerator</code> class is used to generate a
+ * set of parameters to be used with a certain algorithm. Parameter generators
+ * are constructed using the <code>getInstance()</code> factory methods (static
+ * methods that return instances of a given class).</p>
+ *
+ * <p>The object that will generate the parameters can be initialized in two
+ * different ways: in an algorithm-independent manner, or in an
+ * algorithm-specific manner:</p>
+ *
+ * <ul>
+ *  <li>The algorithm-independent approach uses the fact that all parameter
+ *  generators share the concept of a <i>"size"</i> and a <i>source of
+ *  randomness</i>. The measure of <i>size</i> is universally shared by all
+ *  algorithm parameters, though it is interpreted differently for different
+ *  algorithms. For example, in the case of parameters for the <i>DSA</i>
+ *  algorithm, <i>"size"</i> corresponds to the size of the prime modulus (in
+ *  bits). When using this approach, algorithm-specific parameter generation
+ *  values - if any - default to some standard values, unless they can be
+ *  derived from the specified size.</li>
+ *  <li>The other approach initializes a parameter generator object using
+ *  algorithm-specific semantics, which are represented by a set of
+ *  algorithm-specific parameter generation values. To generate Diffie-Hellman
+ *  system parameters, for example, the parameter generation values usually
+ *  consist of the size of the prime modulus and the size of the random
+ *  exponent, both specified in number of bits.</li>
+ * </ul>
+ *
+ * <p>In case the client does not explicitly initialize the
+ * <code>AlgorithmParameterGenerator</code> (via a call to an <code>init()</code>
+ * method), each provider must supply (and document) a default initialization.
+ * For example, the <b>GNU</b> provider uses a default modulus prime size of
+ * <code>1024</code> bits for the generation of <i>DSA</i> parameters.
+ *
+ * @author Mark Benvenuto
+ * @since 1.2
+ * @see AlgorithmParameters
+ * @see AlgorithmParameterSpec
+ */
 public class AlgorithmParameterGenerator
 {
-    private static final String ENGINE_CLASS = "AlgorithmParameterGenerator";
-    
-    private AlgorithmParameterGeneratorSpi paramGenSpi;
-    private Provider provider;
-    private String algorithm;
-    
-    protected AlgorithmParameterGenerator(
-	AlgorithmParameterGeneratorSpi paramGenSpi,
-	Provider provider,
-	String algorithm)
-    {
-	this.paramGenSpi = paramGenSpi;
-	this.provider = provider;
-	this.algorithm = algorithm;
-    }
-
-    public final Provider getProvider()
-    {
-	return this.provider;
-    }
-    
-    public final String getAlgorithm()
-    {
-	return this.algorithm;
-    }
-
-    public final void init(int size)
-    {
-	this.paramGenSpi.engineInit(size, new SecureRandom());
-    }
-
-    public final void init(int size, SecureRandom random)
-    {
-	this.paramGenSpi.engineInit(size, random);
-    }
-
-    public final void init(AlgorithmParameterSpec genParamSpec)
-	throws InvalidAlgorithmParameterException
-    {
-	this.paramGenSpi.engineInit(genParamSpec, new SecureRandom());
-    }
-
-    public final void init(AlgorithmParameterSpec genParamSpec,
-			   SecureRandom random)
-	throws InvalidAlgorithmParameterException
-    {
-	this.paramGenSpi.engineInit(genParamSpec, random);
-    }
-
-    public final AlgorithmParameters generateParameters()
-    {
-	return this.paramGenSpi.engineGenerateParameters();
-    }
-    
-    public static AlgorithmParameterGenerator getInstance(String algorithm)
-	throws NoSuchAlgorithmException
-    {
-	return getInstance(Security.getCryptInstance(ENGINE_CLASS, algorithm));
-    }
-
-    public static AlgorithmParameterGenerator getInstance(String algorithm,
-							  String provider)
-	throws NoSuchAlgorithmException,
-	       NoSuchProviderException
-    {
-	return getInstance(Security.getCryptInstance(ENGINE_CLASS,
-						     algorithm,
-						     provider));
-    }
-
-    private static AlgorithmParameterGenerator getInstance(Security.Engine e)
-    {
-	AlgorithmParameterGeneratorSpi spi;
-	AlgorithmParameterGenerator retval;
-
-	spi = (AlgorithmParameterGeneratorSpi)e.getEngine();
-	retval = new AlgorithmParameterGenerator(spi,
-						 e.getProvider(),
-						 e.getAlgorithm());
-	return retval;
-    }
+  /** Service name for algorithm parameter generators. */
+  private static final String ALGORITHM_PARAMETER_GENERATOR =
+    "AlgorithmParameterGenerator";
+
+  private AlgorithmParameterGeneratorSpi paramGenSpi;
+  private Provider provider;
+  private String algorithm;
+
+  /**
+   * Creates an <code>AlgorithmParameterGenerator</code> object.
+   *
+   * @param paramGenSpi the delegate.
+   * @param provider the provider.
+   * @param algorithm the algorithm.
+   */
+  protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi
+					paramGenSpi, Provider provider,
+					String algorithm)
+  {
+    this.paramGenSpi = paramGenSpi;
+    this.provider = provider;
+    this.algorithm = algorithm;
+  }
+
+  /**
+   * Returns the standard name of the algorithm this parameter generator is
+   * associated with.
+   *
+   * @return the string name of the algorithm.
+   */
+  public final String getAlgorithm()
+  {
+    return algorithm;
+  }
+
+  /**
+   * Generates an <code>AlgorithmParameterGenerator</code> object that
+   * implements the specified digest algorithm. If the default provider package
+   * provides an implementation of the requested digest algorithm, an instance
+   * of <code>AlgorithmParameterGenerator</code> containing that implementation
+   * is returned. If the algorithm is not available in the default package,
+   * other packages are searched.
+   *
+   * @param algorithm the string name of the algorithm this parameter generator
+   * is associated with.
+   * @return the new <code>AlgorithmParameterGenerator</code> object.
+   * @throws NoSuchAlgorithmException if the algorithm is not available in the
+   * environment.
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm)
+    throws NoSuchAlgorithmException
+  {
+    Provider[] p = Security.getProviders();
+    for (int i = 0; i < p.length; i++)
+      try
+        {
+          return getInstance(algorithm, p[i]);
+        }
+      catch (NoSuchAlgorithmException ignored) {}
+
+    throw new NoSuchAlgorithmException(algorithm);
+  }
+
+  /**
+   * Generates an <code>AlgorithmParameterGenerator</code> object for the
+   * requested algorithm, as supplied from the specified provider, if such a
+   * parameter generator is available from the provider.
+   *
+   * @param algorithm the string name of the algorithm.
+   * @param provider the string name of the provider.
+   * @return the new <code>AlgorithmParameterGenerator</code> object.
+   * @throws NoSuchAlgorithmException if the <code>algorithm</code> is not
+   * available from the <code>provider</code>.
+   * @throws NoSuchProviderException if the <code>provider</code> is not
+   * available in the environment.
+   * @throws IllegalArgumentException if the <code>provider</code> name is
+   * <code>null</code> or empty.
+   * @see Provider
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm,
+							String provider)
+    throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    if (provider == null || provider.length() == 0)
+      throw new IllegalArgumentException("Illegal provider");
+
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      throw new NoSuchProviderException();
+
+    return getInstance(algorithm, p);
+  }
+
+  /**
+   * Generates an AlgorithmParameterGenerator object for the requested
+   * algorithm, as supplied from the specified provider, if such a parameter
+   * generator is available from the provider. Note: the <code>provider</code>
+   * doesn't have to be registered.
+   *
+   * @param algorithm the string name of the algorithm.
+   * @param provider the provider.
+   * @return the new AlgorithmParameterGenerator object.
+   * @throws NoSuchAlgorithmException if the algorithm is not available from
+   * the provider.
+   * @throws IllegalArgumentException if the provider is null.
+   * @since 1.4
+   * @see Provider
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm,
+                                                        Provider provider)
+    throws NoSuchAlgorithmException
+  {
+    if (provider == null)
+      throw new IllegalArgumentException("Illegal provider");
+
+    try
+      {
+	return new AlgorithmParameterGenerator(
+	  (AlgorithmParameterGeneratorSpi) Engine.getInstance(
+	    ALGORITHM_PARAMETER_GENERATOR, algorithm, provider),
+	  provider, algorithm);
+      }
+    catch (java.lang.reflect.InvocationTargetException ite)
+      {
+	throw new NoSuchAlgorithmException(algorithm);
+      }
+    catch (ClassCastException cce)
+      {
+	throw new NoSuchAlgorithmException(algorithm);
+      }
+  }
+
+  /**
+   * Returns the provider of this algorithm parameter generator object.
+   *
+   * @return the provider of this algorithm parameter generator object.
+   */
+  public final Provider getProvider()
+  {
+    return provider;
+  }
+
+  /**
+   * Initializes this parameter generator for a certain <i>size</i>. To create
+   * the parameters, the {@link SecureRandom} implementation of the
+   * highest-priority installed provider is used as the source of randomness.
+   * (If none of the installed providers supply an implementation of
+   * {@link SecureRandom}, a system-provided source of randomness is used.)
+   *
+   * @param size the size (number of bits).
+   */
+  public final void init(int size)
+  {
+    init(size, new SecureRandom());
+  }
+
+  /**
+   * Initializes this parameter generator for a certain size and source of
+   * randomness.
+   *
+   * @param size the size (number of bits).
+   * @param random the source of randomness.
+   */
+  public final void init(int size, SecureRandom random)
+  {
+    paramGenSpi.engineInit(size, random);
+  }
+
+  /**
+   * Initializes this parameter generator with a set of algorithm-specific
+   * parameter generation values. To generate the parameters, the {@link
+   * SecureRandom} implementation of the highest-priority installed provider is
+   * used as the source of randomness. (If none of the installed providers
+   * supply an implementation of {@link SecureRandom}, a system-provided source
+   * of randomness is used.)
+   *
+   * @param genParamSpec the set of algorithm-specific parameter generation
+   * values.
+   * @throws InvalidAlgorithmParameterException if the given parameter
+   * generation values are inappropriate for this parameter generator.
+   */
+  public final void init(AlgorithmParameterSpec genParamSpec)
+    throws InvalidAlgorithmParameterException
+  {
+    init(genParamSpec, new SecureRandom());
+  }
+
+  /**
+   * Initializes this parameter generator with a set of algorithm-specific
+   * parameter generation values.
+   *
+   * @param genParamSpec the set of algorithm-specific parameter generation
+   * values.
+   * @param random the source of randomness.
+   * @throws InvalidAlgorithmParameterException if the given parameter
+   * generation values are inappropriate for this parameter generator.
+   */
+  public final void init(AlgorithmParameterSpec genParamSpec,
+                         SecureRandom random)
+    throws InvalidAlgorithmParameterException
+  {
+    paramGenSpi.engineInit(genParamSpec, random);
+  }
+
+  /**
+   * Generates the parameters.
+   *
+   * @return the new {@link AlgorithmParameters} object.
+   */
+  public final AlgorithmParameters generateParameters()
+  {
+    return paramGenSpi.engineGenerateParameters();
+  }
 }




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