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

This file is a part of GNU Classpath.

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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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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.crypto 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 Crypto provider
 * supplies (and document) default values to be used. For example, the GNU
 * Crypto provider uses a default <i>modulus</i> size (keysize) of 1024 bits for
 * the DSS (Digital Signature Standard) a.k.a <i>DSA</i>.<p>
 */
public abstract class KeyPairGeneratorAdapter extends KeyPairGenerator
{

  // Constants and variables
  // -------------------------------------------------------------------------

  /** Our underlying keypair instance. */
  protected IKeyPairGenerator adaptee;

  // Constructor(s)
  // -------------------------------------------------------------------------

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

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

  // Class methods
  // -------------------------------------------------------------------------

  // java.security.KeyPairGeneratorSpi interface implementation
  // -------------------------------------------------------------------------

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

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

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