gcc/libjava/classpath/java/security/AlgorithmParametersSpi.java

/* AlgorithmParametersSpi.java --- Algorithm Parameters SPI
   Copyright (C) 1999, 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.

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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
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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
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terms of your choice, provided that you also meet, for each linked
independent module, the terms and conditions of the license of that
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package java.security;

import java.io.IOException;
import java.security.spec.AlgorithmParameterSpec;
import java.security.spec.InvalidParameterSpecException;

/**
 * AlgorithmParametersSpi is the Service Provider Interface
 * for the Algorithm Parameters class. This class is used
 * to manage the algorithm parameters.
 *
 * @since 1.2
 * @author Mark Benvenuto
 */
public abstract class AlgorithmParametersSpi
{
  /**
   * Creates a new instance of AlgorithmParametersSpi
   */
  public AlgorithmParametersSpi()
  {
  }

  /**
   * Initializes the engine with the specified
   * AlgorithmParameterSpec class.
   *
   * @param paramSpec A AlgorithmParameterSpec to initialize with
   *
   * @throws InvalidParameterSpecException For an inapporiate
   * ParameterSpec class
   */
  protected abstract void engineInit(AlgorithmParameterSpec paramSpec)
    throws InvalidParameterSpecException;

  /**
   * Initializes the engine with the specified
   * parameters stored in the byte array and decodes them
   * according to the ASN.1 specification. If the ASN.1
   * specification exists then it succeeds or else it throws
   * IOException.
   *
   * @param params Parameters to initialize with
   *
   * @throws IOException Decoding Error
   */
  protected abstract void engineInit(byte[]params) throws IOException;

  /**
   * Initializes the engine with the specified
   * parameters stored in the byte array and decodes them
   * according to the specified decoding specification.
   * If format is null, then it is decoded using the ASN.1
   * specification if it exists or else it throws
   * IOException.
   *
   * @param params Parameters to initialize with
   * @param format Name of decoding format to use
   *
   * @throws IOException Decoding Error
   */
  protected abstract void engineInit(byte[]params, String format)
    throws IOException;


  /**
   * Returns a specification of this AlgorithmParameters object.
   * paramSpec identifies the class to return the AlgortihmParameters
   * in.
   *
   * @param paramSpec Class to return AlgorithmParameters in
   *
   * @return the parameter specification
   *
   * @throws InvalidParameterSpecException if the paramSpec is an
   * invalid parameter class
   */
  protected abstract <T extends AlgorithmParameterSpec>
  T engineGetParameterSpec(Class<T> paramSpec)
    throws InvalidParameterSpecException;


  /**
   * Returns the parameters in the default encoding format.
   * The primary encoding format is ASN.1 format if it exists
   * for the specified type.
   *
   * @return byte array representing the parameters
   */
  protected abstract byte[] engineGetEncoded() throws IOException;


  /**
   * Returns the parameters in the specified encoding format.
   * If <code>format</code> is <code>null</code> then the
   * primary encoding format is used, the ASN.1 format,
   * if it exists for the specified type.
   *
   * @return byte array representing the parameters
   */
  protected abstract byte[] engineGetEncoded(String format)
    throws IOException;

  /**
   * Returns a string describing the parameters in the
   * AlgorithmParametersSpi class.
   *
   * @return A string representing the format of the parameters.
   */
  protected abstract String engineToString();
}