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1 files changed, 277 insertions, 0 deletions

diff --git a/libjava/classpath/java/security/AlgorithmParameterGenerator.java b/libjava/classpath/java/security/AlgorithmParameterGenerator.java
new file mode 100644
index 000000000..a92552b9e
--- /dev/null
+++ b/libjava/classpath/java/security/AlgorithmParameterGenerator.java
@@ -0,0 +1,277 @@
+/* AlgorithmParameterGenerator.java --- Algorithm Parameter Generator
+   Copyright (C) 1999, 2003, 2004  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., 51 Franklin Street, Fifth Floor, Boston, MA
+02110-1301 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 gnu.java.lang.CPStringBuilder;
+
+import gnu.java.security.Engine;
+
+import java.lang.reflect.InvocationTargetException;
+import java.security.spec.AlgorithmParameterSpec;
+
+/**
+ * <code>AlgorithmParameterGenerator</code> is used to generate algorithm
+ * parameters for specified algorithms.
+ *
+ * <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
+{
+  /** Service name for algorithm parameter generators. */
+  private static final String ALGORITHM_PARAMETER_GENERATOR =
+    "AlgorithmParameterGenerator";
+
+  private AlgorithmParameterGeneratorSpi paramGenSpi;
+  private Provider provider;
+  private String algorithm;
+
+  /**
+   * Constructs a new instance of <code>AlgorithmParameterGenerator</code>.
+   *
+   * @param paramGenSpi
+   *          the generator to use.
+   * @param provider
+   *          the provider to use.
+   * @param algorithm
+   *          the algorithm to use.
+   */
+  protected AlgorithmParameterGenerator(AlgorithmParameterGeneratorSpi
+                                        paramGenSpi, Provider provider,
+                                        String algorithm)
+  {
+    this.paramGenSpi = paramGenSpi;
+    this.provider = provider;
+    this.algorithm = algorithm;
+  }
+
+  /** @return the name of the algorithm. */
+  public final String getAlgorithm()
+  {
+    return algorithm;
+  }
+
+  /**
+   * Returns a new <code>AlgorithmParameterGenerator</code> instance which
+   * generates algorithm parameters for the specified algorithm.
+   *
+   * @param algorithm the name of algorithm to use.
+   * @return the new instance.
+   * @throws NoSuchAlgorithmException if <code>algorithm</code> is not
+   *           implemented by any provider.
+   * @throws IllegalArgumentException if <code>algorithm</code> is
+   *           <code>null</code> or is an empty string.
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm)
+      throws NoSuchAlgorithmException
+  {
+    Provider[] p = Security.getProviders();
+    NoSuchAlgorithmException lastException = null;
+    for (int i = 0; i < p.length; i++)
+      try
+        {
+          return getInstance(algorithm, p[i]);
+        }
+      catch (NoSuchAlgorithmException x)
+        {
+          lastException = x;
+        }
+    if (lastException != null)
+      throw lastException;
+    throw new NoSuchAlgorithmException(algorithm);
+  }
+
+  /**
+   * Returns a new <code>AlgorithmParameterGenerator</code> instance which
+   * generates algorithm parameters for the specified algorithm.
+   *
+   * @param algorithm the name of algorithm to use.
+   * @param provider the name of the {@link Provider} to use.
+   * @return the new instance.
+   * @throws NoSuchAlgorithmException if the algorithm is not implemented by the
+   *           named provider.
+   * @throws NoSuchProviderException if the named provider was not found.
+   * @throws IllegalArgumentException if either <code>algorithm</code> or
+   *           <code>provider</code> is <code>null</code> or empty.
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm,
+                                                        String provider)
+      throws NoSuchAlgorithmException, NoSuchProviderException
+  {
+    if (provider == null)
+      throw new IllegalArgumentException("provider MUST NOT be null");
+    provider = provider.trim();
+    if (provider.length() == 0)
+      throw new IllegalArgumentException("provider MUST NOT be empty");
+    Provider p = Security.getProvider(provider);
+    if (p == null)
+      throw new NoSuchProviderException(provider);
+    return getInstance(algorithm, p);
+  }
+
+  /**
+   * Returns a new <code>AlgorithmParameterGenerator</code> instance which
+   * generates algorithm parameters for the specified algorithm.
+   *
+   * @param algorithm the name of algorithm to use.
+   * @param provider the {@link Provider} to use.
+   * @return the new instance.
+   * @throws NoSuchAlgorithmException if the algorithm is not implemented by
+   *           {@link Provider}.
+   * @throws IllegalArgumentException if either <code>algorithm</code> or
+   *           <code>provider</code> is <code>null</code>, or if
+   *           <code>algorithm</code> is an empty string.
+   * @since 1.4
+   * @see Provider
+   */
+  public static AlgorithmParameterGenerator getInstance(String algorithm,
+                                                        Provider provider)
+      throws NoSuchAlgorithmException
+  {
+    CPStringBuilder sb = new CPStringBuilder()
+        .append("AlgorithmParameterGenerator for algorithm [")
+        .append(algorithm).append("] from provider[")
+        .append(provider).append("] could not be created");
+    Throwable cause;
+    try
+      {
+        Object spi = Engine.getInstance(ALGORITHM_PARAMETER_GENERATOR,
+                                        algorithm,
+                                        provider);
+        return new AlgorithmParameterGenerator((AlgorithmParameterGeneratorSpi) spi,
+                                               provider,
+                                               algorithm);
+      }
+    catch (InvocationTargetException x)
+      {
+        cause = x.getCause();
+        if (cause instanceof NoSuchAlgorithmException)
+          throw (NoSuchAlgorithmException) cause;
+        if (cause == null)
+          cause = x;
+      }
+    catch (ClassCastException x)
+      {
+        cause = x;
+      }
+    NoSuchAlgorithmException x = new NoSuchAlgorithmException(sb.toString());
+    x.initCause(cause);
+    throw x;
+  }
+
+  /** @return the {@link Provider} of this generator. */
+  public final Provider getProvider()
+  {
+    return provider;
+  }
+
+  /**
+   * Initializes this instance with the specified size. Since no source of
+   * randomness is supplied, a default one will be used.
+   *
+   * @param size
+   *          size (in bits) to use.
+   */
+  public final void init(int size)
+  {
+    init(size, new SecureRandom());
+  }
+
+  /**
+   * Initializes this instance with the specified key-size and source of
+   * randomness.
+   *
+   * @param size
+   *          the size (in bits) to use.
+   * @param random
+   *          the {@link SecureRandom} to use.
+   */
+  public final void init(int size, SecureRandom random)
+  {
+    paramGenSpi.engineInit(size, random);
+  }
+
+  /**
+   * Initializes this instance with the specified {@link AlgorithmParameterSpec}.
+   * Since no source of randomness is supplied, a default one will be used.
+   *
+   * @param genParamSpec
+   *          the {@link AlgorithmParameterSpec} to use.
+   * @throws InvalidAlgorithmParameterException
+   *           if <code>genParamSpec</code> is invalid.
+   */
+  public final void init(AlgorithmParameterSpec genParamSpec)
+      throws InvalidAlgorithmParameterException
+  {
+    init(genParamSpec, new SecureRandom());
+  }
+
+  /**
+   * Initializes this instance with the specified {@link AlgorithmParameterSpec}
+   * and source of randomness.
+   *
+   * @param genParamSpec
+   *          the {@link AlgorithmParameterSpec} to use.
+   * @param random
+   *          the {@link SecureRandom} to use.
+   * @throws InvalidAlgorithmParameterException
+   *           if <code>genParamSpec</code> is invalid.
+   */
+  public final void init(AlgorithmParameterSpec genParamSpec,
+                         SecureRandom random)
+    throws InvalidAlgorithmParameterException
+  {
+    paramGenSpi.engineInit(genParamSpec, random);
+  }
+
+  /** @return a new instance of {@link AlgorithmParameters}. */
+  public final AlgorithmParameters generateParameters()
+  {
+    return paramGenSpi.engineGenerateParameters();
+  }
+}