/* KeyPairGeneratorAdapter.java -- 
   Copyright 2001, 2002, 2006 Free Software Foundation, Inc.

This file is a 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
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General Public License for more details.

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USA

Linking this library statically or dynamically with other modules is
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permission to link this library with independent modules to produce an
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package gnu.java.security.jce.sig;

import gnu.java.security.key.IKeyPairGenerator;
import gnu.java.security.key.KeyPairGeneratorFactory;

import java.security.InvalidAlgorithmParameterException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.SecureRandom;
import java.security.spec.AlgorithmParameterSpec;

/**
 * The implementation of a generic {@link java.security.KeyPairGenerator}
 * adapter class to wrap GNU keypair generator instances.
 * <p>
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>) for
 * the {@link java.security.KeyPairGenerator} class, which is used to generate
 * pairs of public and private keys.
 * <p>
 * All the abstract methods in the {@link java.security.KeyPairGeneratorSpi}
 * class are implemented by this class and all its sub-classes.
 * <p>
 * In case the client does not explicitly initialize the KeyPairGenerator (via a
 * call to an <code>initialize()</code> method), the GNU provider supplies
 * (and document) default values to be used. For example, the GNU provider uses
 * a default <i>modulus</i> size (keysize) of 1024 bits for the DSS (Digital
 * Signature Standard) a.k.a <i>DSA</i>.
 */
public abstract class KeyPairGeneratorAdapter
    extends KeyPairGenerator
{
  /** Our underlying keypair instance. */
  protected IKeyPairGenerator adaptee;

  /**
   * Trivial protected constructor.
   * 
   * @param kpgName the canonical name of the keypair generator algorithm.
   */
  protected KeyPairGeneratorAdapter(String kpgName)
  {
    super(kpgName);

    this.adaptee = KeyPairGeneratorFactory.getInstance(kpgName);
  }

  public abstract void initialize(int keysize, SecureRandom random);

  public abstract void initialize(AlgorithmParameterSpec params,
                                  SecureRandom random)
      throws InvalidAlgorithmParameterException;

  public KeyPair generateKeyPair()
  {
    return adaptee.generate();
  }
}