iaik.security.elgamal

Class ElGamalParameterGenerator

java.lang.Object

java.security.AlgorithmParameterGeneratorSpi

iaik.security.elgamal.ElGamalParameterGenerator

public final class ElGamalParameterGenerator
extends java.security.AlgorithmParameterGeneratorSpi

This class implements an AlgorithmParameterGenerator that generates parameters for key-agreement according to the ElGamal encryption scheme.

Note that parameter generation is fairly slow but this should not be a problem as this is a hardly performed activity anyway. Typically they will be generated once per user group by the CA and then the users will generate their keys using the parameters provided.

Applications shall use AlgorithmParameterGenerator.getInstance("ElGamal") for obtaining an AlgorithmParamterGenerator for generating ElGamal parameters in opaque representation. Once the generator has been created, it shall be properly initialized by one of the several init methods. If none explicit initialization is done, per default the length of the prime modulus is set to 1024 bits and the length of the exponent (private value) is chosen to be 300 bits. After initializing the generator (or relying on default settings), the reguired parameters actually are created by calling the generateParameters method.

Version:

File Revision 21

Constructor Summary

Constructors

Constructor and Description
ElGamalParameterGenerator()

Method Summary

Methods

Modifier and Type	Method and Description
protected java.security.AlgorithmParameters	engineGenerateParameters()
protected void	engineInit(java.security.spec.AlgorithmParameterSpec genParamSpec, java.security.SecureRandom random)
protected void	engineInit(int strength, java.security.SecureRandom random)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ElGamalParameterGenerator

public ElGamalParameterGenerator()

Method Detail

engineInit

protected void engineInit(int strength,
              java.security.SecureRandom random)

Specified by:

engineInit in class java.security.AlgorithmParameterGeneratorSpi

engineInit

protected void engineInit(java.security.spec.AlgorithmParameterSpec genParamSpec,
              java.security.SecureRandom random)
                   throws java.security.InvalidAlgorithmParameterException

Specified by:

engineInit in class java.security.AlgorithmParameterGeneratorSpi

Throws:

java.security.InvalidAlgorithmParameterException

engineGenerateParameters

protected java.security.AlgorithmParameters engineGenerateParameters()

Specified by:

engineGenerateParameters in class java.security.AlgorithmParameterGeneratorSpi