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## 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
`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:
    `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.

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For further API reference and developer documentation, see Java 2 SDK SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms. Also see the documentation redistribution policy.