java.security
Class AlgorithmParameterGeneratorSpi

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

public abstract class AlgorithmParameterGeneratorSpi

extends Object

This class defines the Service Provider Interface (SPI) for the AlgorithmParameterGenerator class, which is used to generate a set of parameters to be used with a certain algorithm.

All the abstract methods in this class must be implemented by each cryptographic service provider who wishes to supply the implementation of a parameter generator for a particular algorithm.

In case the client does not explicitly initialize the AlgorithmParameterGenerator (via a call to an engineInit method), each provider must supply (and document) a default initialization. For example, the Sun provider uses a default modulus prime size of 1024 bits for the generation of DSA parameters.

Since:

JDK1.2

See Also:

AlgorithmParameterGenerator, AlgorithmParameters, AlgorithmParameterSpec

Constructor Summary

AlgorithmParameterGeneratorSpi()

Method Summary

protected abstract AlgorithmParameters	engineGenerateParameters() Generates the parameters.
protected abstract void	engineInit(AlgorithmParameterSpec genParamSpec, SecureRandom random) Initializes this parameter generator with a set of algorithm-specific parameter generation values.
protected abstract void	engineInit(int size, SecureRandom random) Initializes this parameter generator for a certain size and source of randomness.

Methods inherited from class java.lang.Object

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

Constructor Detail

AlgorithmParameterGeneratorSpi

public AlgorithmParameterGeneratorSpi()

Method Detail

engineInit

protected abstract void engineInit(int size,
                                   SecureRandom random)

Initializes this parameter generator for a certain size and source of randomness.

Parameters:

size - the size (number of bits).

random - the source of randomness.

engineInit

protected abstract void engineInit(AlgorithmParameterSpec genParamSpec,
                                   SecureRandom random)
                            throws InvalidAlgorithmParameterException

Initializes this parameter generator with a set of algorithm-specific parameter generation values.

Parameters:

params - the set of algorithm-specific parameter generation values.

random - the source of randomness.

Throws:

InvalidAlgorithmParameterException - if the given parameter generation values are inappropriate for this parameter generator.

engineGenerateParameters

protected abstract AlgorithmParameters engineGenerateParameters()

Generates the parameters.

Returns:

the new AlgorithmParameters object.