AlgorithmParameterGeneratorSpi

AI-generated Key Takeaways

• AlgorithmParameterGeneratorSpi is a Service Provider Interface (SPI) for generating algorithm parameters.

• It requires cryptographic providers to implement methods for initializing and generating algorithm parameters.

• Providers must offer default initialization if the client doesn't explicitly initialize the AlgorithmParameterGenerator.

• The class includes methods for generating parameters and initializing the generator based on size or specific values.

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.

See Also

• AlgorithmParameterGenerator
• AlgorithmParameters
• AlgorithmParameterSpec

Public Constructor Summary

AlgorithmParameterGeneratorSpi()

Protected Method Summary

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

Inherited Method Summary

From class java.lang.Object

Object	clone() Creates and returns a copy of this Object.
boolean	equals(Object obj) Compares this instance with the specified object and indicates if they are equal.
void	finalize() Invoked when the garbage collector has detected that this instance is no longer reachable.
final Class<?>	getClass() Returns the unique instance of Class that represents this object's class.
int	hashCode() Returns an integer hash code for this object.
final void	notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
final void	notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up.
String	toString() Returns a string containing a concise, human-readable description of this object.
final void	wait(long timeout, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait(long timeout) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
final void	wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object.

Public Constructors

public AlgorithmParameterGeneratorSpi ()

Protected Methods

protected abstract AlgorithmParameters engineGenerateParameters ()

Generates the parameters.

Returns

• the new AlgorithmParameters object.

protected abstract void engineInit (AlgorithmParameterSpec genParamSpec, SecureRandom random)

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

Parameters

genParamSpec	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.

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.