AlgorithmParameterGeneratorSpi

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:

1.2

See Also:

AlgorithmParameterGenerator, AlgorithmParameters, AlgorithmParameterSpec

Constructor Summary

Constructors

Constructor and Description
`AlgorithmParameterGeneratorSpi()`

Method Summary

All Methods

Instance Methods

Abstract Methods
Modifier and Type	Method and Description
`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:
    
    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.
  - engineGenerateParameters
```
protected abstract AlgorithmParameters engineGenerateParameters()
```
    Generates the parameters.
    
    Returns:
    
    the new AlgorithmParameters object.