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. 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.

Since:
1.2
See Also:

  • Constructor Summary

    Constructors
    Constructor
    Description
    AlgorithmParameterGeneratorSpi()
    Constructor for subclasses to call.

  • Method Summary

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

    Methods declared in class Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
    Modifier and Type
    Method
    Description
    protected Object
    clone()
    Answers a new instance of the same class as the receiver, whose slots have been filled in with the values in the slots of the receiver.
    boolean
    equals(Object o)
    Compares the argument to the receiver, and answers true if they represent the same object using a class specific comparison.
    protected void
    finalize()
    Deprecated, for removal: This API element is subject to removal in a future version.
    May cause performance issues, deadlocks and hangs.
    final Class<? extends Object>
    getClass()
    Answers the unique instance of java.lang.Class which represents the class of the receiver.
    int
    hashCode()
    Answers an integer hash code for the receiver.
    final void
    notify()
    Causes one thread which is waiting on the receiver to be made ready to run.
    final void
    notifyAll()
    Causes all threads which are waiting on the receiver to be made ready to run.
    String
    toString()
    Answers a string containing a concise, human-readable description of the receiver.
    final void
    wait()
    Causes the thread which sent this message to be made not ready to run pending some change in the receiver (as indicated by notify or notifyAll).
    final void
    wait(long time)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.
    final void
    wait(long time, int frac)
    Causes the thread which sent this message to be made not ready to run either pending some change in the receiver (as indicated by notify or notifyAll) or the expiration of the timeout.

  • Constructor Details

    • AlgorithmParameterGeneratorSpi

      public AlgorithmParameterGeneratorSpi()
      Constructor for subclasses to call.

  • Method Details

    • 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.