public abstract class AlgorithmParameterGeneratorSpi extends Object
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. See the Keysize Restriction sections of the JDK Providers document for information on the AlgorithmParameterGenerator defaults used by JDK providers. However, note that defaults may vary across different providers. Additionally, the default value for a provider may change in a future version. Therefore, it is recommended to explicitly initialize the AlgorithmParameterGenerator
instead of relying on provider-specific defaults.
Constructor | Description |
---|---|
AlgorithmParameterGeneratorSpi() |
Constructor for subclasses to call. |
Modifier and Type | Method | Description |
---|---|---|
protected abstract AlgorithmParameters |
engineGenerateParameters() |
Generates the parameters. |
protected abstract void |
engineInit |
Initializes this parameter generator for a certain size and source of randomness. |
protected abstract void |
engineInit |
Initializes this parameter generator with a set of algorithm-specific parameter generation values. |
public AlgorithmParameterGeneratorSpi()
protected abstract void engineInit(int size, SecureRandom random)
size
- the size (number of bits).random
- the source of randomness.protected abstract void engineInit(AlgorithmParameterSpec genParamSpec, SecureRandom random) throws InvalidAlgorithmParameterException
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()
AlgorithmParameters
object.
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https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/security/AlgorithmParameterGeneratorSpi.html