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.
AlgorithmParameterGenerator, AlgorithmParameters, AlgorithmParameterSpec
public AlgorithmParameterGeneratorSpi()
protected abstract void engineInit(int size,
SecureRandom random) Initializes this parameter generator for a certain size and source of randomness.
size - the size (number of bits).random - the source of randomness.protected abstract void engineInit(AlgorithmParameterSpec genParamSpec,
SecureRandom random)
throws InvalidAlgorithmParameterException Initializes this parameter generator with a set of algorithm-specific parameter generation values.
genParamSpec - the set of algorithm-specific parameter generation values.random - the source of randomness.InvalidAlgorithmParameterException - if the given parameter generation values are inappropriate for this parameter generator.protected abstract AlgorithmParameters engineGenerateParameters()
Generates the parameters.
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