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Java(TM) 2 Platform, Standard Edition, v1.2.2 API Specification: Class AlgorithmParametersSpi - JDK 5 Documentation v1.2.2, Java 2 SDK 英文文档

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java.security
Class AlgorithmParametersSpi

java.lang.Object
  |
  +--java.security.AlgorithmParametersSpi

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public abstract class AlgorithmParametersSpi

extends Object

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.

Since:

JDK1.2

See Also:

AlgorithmParameters, AlgorithmParameterSpec, DSAParameterSpec

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Constructor Summary

AlgorithmParametersSpi()

 

Method Summary
protected abstract  byte[]	engineGetEncoded()           Returns the parameters in their primary encoding format.
protected abstract  byte[]	engineGetEncoded(String format)           Returns the parameters encoded in the specified format.
protected abstract  AlgorithmParameterSpec	engineGetParameterSpec(Class paramSpec)           Returns a (transparent) specification of this parameters object.
protected abstract  void	engineInit(AlgorithmParameterSpec paramSpec)           Initializes this parameters object using the parameters specified in paramSpec.
protected abstract  void	engineInit(byte[] params)           Imports the specified parameters and decodes them according to the primary decoding format for parameters.
protected abstract  void	engineInit(byte[] params, String format)           Imports the parameters from params and decodes them according to the specified decoding format.
protected abstract  String	engineToString()           Returns a formatted string describing the parameters.

 

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

 

Constructor Detail

AlgorithmParametersSpi

public AlgorithmParametersSpi()

Method Detail

engineInit

protected abstract void engineInit(AlgorithmParameterSpec paramSpec)
                            throws InvalidParameterSpecException

Initializes this parameters object using the parameters specified in paramSpec.

Parameters:

paramSpec - the parameter specification.

Throws:

InvalidParameterSpecException - if the given parameter specification is inappropriate for the initialization of this parameter object.

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engineInit

protected abstract void engineInit(byte[] params)
                            throws IOException

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.

Parameters:

params - the encoded parameters.

Throws:

IOException - on decoding errors

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engineInit

protected abstract void engineInit(byte[] params,
                                   String format)
                            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.

Parameters:

params - the encoded parameters.

format - the name of the decoding format.

Throws:

IOException - on decoding errors

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engineGetParameterSpec

protected abstract AlgorithmParameterSpec engineGetParameterSpec(Class paramSpec)
                                                          throws InvalidParameterSpecException

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.

Parameters:

paramSpec - the the specification class in which the parameters should be returned.

Returns:

the parameter specification.

Throws:

InvalidParameterSpecException - if the requested parameter specification is inappropriate for this parameter object.

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engineGetEncoded

protected abstract byte[] engineGetEncoded()
                                    throws IOException

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.

Returns:

the parameters encoded using the specified encoding scheme.

Throws:

IOException - on encoding errors.

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engineGetEncoded

protected abstract byte[] engineGetEncoded(String format)
                                    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.

Parameters:

format - the name of the encoding format.

Returns:

the parameters encoded using the specified encoding scheme.

Throws:

IOException - on encoding errors.

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engineToString

protected abstract String engineToString()

Returns a formatted string describing the parameters.

Returns:

a formatted string describing the parameters.

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