/* AlgorithmParameterGeneratorSpi.java --- Algorithm Parameter Generator SPI
   Copyright (C) 1999 Free Software Foundation, Inc.

This file is part of GNU Classpath.

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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;

/**
   AlgorithmParameterGeneratorSpi is the Service Provider 
   Interface for the AlgorithmParameterGenerator class. 
   This class is used to generate the algorithm parameters
   for a specific algorithm.

   @since JDK 1.2
   @author Mark Benvenuto
 */
public abstract class AlgorithmParameterGeneratorSpi
{

  /**
     Constructs a new AlgorithmParameterGeneratorSpi
   */
  public AlgorithmParameterGeneratorSpi()
  {
  }

  /**
     Initializes the parameter generator with the specified size
     and SecureRandom

     @param size the size( in number of bits) 
     @param random the SecureRandom class to use for randomness
   */
  protected abstract void engineInit(int size, SecureRandom random);

  /**
     Initializes the parameter generator with the specified
     AlgorithmParameterSpec and SecureRandom classes.

     If genParamSpec is an invalid AlgorithmParameterSpec for this
     AlgorithmParameterGeneratorSpi then it throws
     InvalidAlgorithmParameterException

     @param genParamSpec the AlgorithmParameterSpec class to use
     @param random the SecureRandom class to use for randomness

     @throws InvalidAlgorithmParameterException genParamSpec is invalid
   */
  protected abstract void engineInit(AlgorithmParameterSpec genParamSpec,
				     SecureRandom random) throws
    InvalidAlgorithmParameterException;


  /**
     Generate a new set of AlgorithmParameters.

     @returns a new set of algorithm parameters
   */
  protected abstract AlgorithmParameters engineGenerateParameters();

}