source: trunk/gcc/libjava/java/security/KeyPairGeneratorSpi.java

/* KeyPairGeneratorSpi.java --- Key Pair Generator SPI Class
   Copyright (C) 1999, 2002 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
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02111-1307 USA.

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permission to link this library with independent modules to produce an
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package java.security;
import java.security.spec.AlgorithmParameterSpec;

/**
   KeyPairGeneratorSpi is the interface used to generate key pairs
   for security algorithms.

   @author Mark Benvenuto
 */
public abstract class KeyPairGeneratorSpi
{
  /**
     Constructs a new KeyPairGeneratorSpi
   */
  public KeyPairGeneratorSpi()
  {
  }

  /**
     Initialize the KeyPairGeneratorSpi with the specified
     key size and source of randomness

     @param keysize size of the key to generate
     @param random A SecureRandom source of randomness  
   */
  public abstract void initialize(int keysize, SecureRandom random);

  /**
     Initialize the KeyPairGeneratorSpi with the specified
     AlgorithmParameterSpec and source of randomness

     This is a concrete method. It may be overridden by the provider
     and if the AlgorithmParameterSpec class is invalid
     throw InvalidAlgorithmParameterException. By default this
     method just throws UnsupportedOperationException.

     @param params A AlgorithmParameterSpec to intialize with
     @param random A SecureRandom source of randomness  

     @throws InvalidAlgorithmParameterException
   */
  public void initialize(AlgorithmParameterSpec params, SecureRandom random)
    throws InvalidAlgorithmParameterException
  {
    throw new java.lang.UnsupportedOperationException();
  }

  /**
     Generates a KeyPair according the rules for the algorithm.
     Unless intialized, algorithm defaults will be used. It 
     creates a unique key pair each time.

     @return a key pair
   */
  public abstract KeyPair generateKeyPair();

  /**
     Returns a clone of this class.

     If cloning is not supported, then by default the class throws a
     CloneNotSupportedException.  The MessageDigestSpi provider
     implementation has to overload this class in order to be
     cloneable.
   */
  public Object clone() throws CloneNotSupportedException
  {
    if (this instanceof Cloneable)
      return super.clone();
    else
      throw new CloneNotSupportedException();
  }
}