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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
See Also:
Since:1.2
/**
 * This class defines the <i>Service Provider Interface</i> (<b>SPI</b>)
 * for the {@code AlgorithmParameters} class, which is used to manage
 * algorithm parameters.
 *
 * <p> 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
 *
 *
 * @see AlgorithmParameters
 * @see java.security.spec.AlgorithmParameterSpec
 * @see java.security.spec.DSAParameterSpec
 *
 * @since 1.2
 */

public abstract class AlgorithmParametersSpi {

    
Initializes this parameters object using the parameters specified in paramSpec. 
Params:
  • paramSpec – the parameter specification.
Throws:
/**
     * Initializes this parameters object using the parameters
     * specified in {@code 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.

Params:
  • params – the encoded parameters.
Throws:
  • IOException – on decoding errors
/**
     * 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. 
Params:
  • params – the encoded parameters.
  • format – the name of the decoding format.
Throws:
/**
     * Imports the parameters from {@code params} and
     * decodes them according to the specified decoding format.
     * If {@code 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. 
Params:
  • paramSpec – the specification class in which
the parameters should be returned.
Type parameters:
  • <T> – the type of the parameter specification to be returned
Throws:
Returns:the parameter specification.
/**
     * Returns a (transparent) specification of this parameters
     * object.
     * {@code paramSpec} identifies the specification class in which
     * the parameters should be returned. It could, for example, be
     * {@code DSAParameterSpec.class}, to indicate that the
     * parameters should be returned in an instance of the
     * {@code DSAParameterSpec} class.
     *
     * @param <T> the type of the parameter specification to be returned
     *
     * @param paramSpec 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
        <T extends AlgorithmParameterSpec>
        T engineGetParameterSpec(Class<T> 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.

Throws:
Returns:the parameters encoded using their primary encoding format.
/**
     * 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 their primary encoding format.
     *
     * @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. 
Params:
  • format – the name of the encoding format.
Throws:
Returns:the parameters encoded using the specified encoding scheme.
/**
     * Returns the parameters encoded in the specified format.
     * If {@code 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.

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