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/*
This is not an official specification document, and usage is restricted.


NOTICE





(c) 2005-2007 Sun Microsystems, Inc. All Rights Reserved.

Neither this file nor any files generated from it describe a complete
specification, and they may only be used as described below. For
example, no permission is given for you to incorporate this file, in
whole or in part, in an implementation of a Java specification.

Sun Microsystems Inc. owns the copyright in this file and it is provided
to you for informative, as opposed to normative, use. The file and any
files generated from it may be used to generate other informative
documentation, such as a unified set of documents of API signatures for
a platform that includes technologies expressed as Java APIs. The file
may also be used to produce "compilation stubs," which allow
applications to be compiled and validated for such platforms.

Any work generated from this file, such as unified javadocs or compiled
stub files, must be accompanied by this notice in its entirety.

This work corresponds to the API signatures of JSR 219: Foundation
Profile 1.1. In the event of a discrepency between this work and the
JSR 219 specification, which is available at
http://www.jcp.org/en/jsr/detail?id=219, the latter takes precedence.
*/


  


package java.security;

import java.io.*;

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

/** 
 * This class defines the Service Provider Interface (SPI)
 * for the AlgorithmParameters class, which is used to manage
 * algorithm parameters.
 *
 *  All the abstract methods in this class must be implemented by each 
 * cryptographic service provider who wishes to supply parameter management
 * for a particular algorithm.
 *
 * @author Jan Luehe
 *
 * @version 1.8, 02/02/00
 *
 * @see AlgorithmParameters
 * @see java.security.spec.AlgorithmParameterSpec
 * @see java.security.spec.DSAParameterSpec
 *
 * @since 1.2
 */
public abstract class AlgorithmParametersSpi
{

    public AlgorithmParametersSpi() { }

    /** 
     * Initializes this parameters object using the parameters 
     * specified in paramSpec.
     *
     * @param paramSpec the parameter specification.
     *
     * @exception InvalidParameterSpecException if the given parameter
     * specification is inappropriate for the initialization of this parameter
     * object.
     */
    protected abstract void engineInit(AlgorithmParameterSpec paramSpec)
        throws InvalidParameterSpecException;

    /** 
     * Imports the specified parameters and decodes them
     * according to the primary decoding format for parameters.
     * The primary decoding format for parameters is ASN.1, if an ASN.1
     * specification for this type of parameters exists.
     *
     * @param params the encoded parameters.
     *
     * @exception IOException on decoding errors
     */
    protected abstract void engineInit(byte[] params) throws IOException;

    /** 
     * Imports the parameters from params and
     * decodes them according to the specified decoding format.
     * If format is null, the
     * primary decoding format for parameters is used. The primary decoding
     * format is ASN.1, if an ASN.1 specification for these parameters
     * exists.
     *
     * @param params the encoded parameters.
     *
     * @param format the name of the decoding format.
     *
     * @exception IOException on decoding errors
     */
    protected abstract void engineInit(byte[] params, String format)
        throws IOException;

    /** 
     * Returns a (transparent) specification of this parameters
     * object.
     * paramSpec identifies the specification class in which 
     * the parameters should be returned. It could, for example, be
     * DSAParameterSpec.class, to indicate that the
     * parameters should be returned in an instance of the 
     * DSAParameterSpec class.
     *
     * @param paramSpec the the specification class in which 
     * the parameters should be returned.
     *
     * @return the parameter specification.
     *
     * @exception InvalidParameterSpecException if the requested parameter
     * specification is inappropriate for this parameter object.
     */
    protected abstract AlgorithmParameterSpec engineGetParameterSpec(Class
        paramSpec) throws InvalidParameterSpecException;

    /** 
     * Returns the parameters in their primary encoding format.
     * The primary encoding format for parameters is ASN.1, if an ASN.1
     * specification for this type of parameters exists.
     *
     * @return the parameters encoded using the specified encoding scheme.
     *
     * @exception IOException on encoding errors.
     */
    protected abstract byte[] engineGetEncoded() throws IOException;

    /** 
     * Returns the parameters encoded in the specified format.
     * If format is null, the
     * primary encoding format for parameters is used. The primary encoding
     * format is ASN.1, if an ASN.1 specification for these parameters
     * exists.
     *
     * @param format the name of the encoding format.
     *
     * @return the parameters encoded using the specified encoding scheme.
     *
     * @exception IOException on encoding errors.
     */
    protected abstract byte[] engineGetEncoded(String format)
        throws IOException;

    /** 
     * Returns a formatted string describing the parameters.
     *
     * @return a formatted string describing the parameters.
     */
    protected abstract String engineToString();
}
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