iaik.security.dsa

Class DSAParameterGenerator

java.lang.Object

java.security.AlgorithmParameterGeneratorSpi

iaik.security.dsa.DSAParameterGenerator

public class DSAParameterGenerator
extends java.security.AlgorithmParameterGeneratorSpi

This class implements an AlgorithmParameterGenerator that generates parameters for the DSA algorithm as specified in FIPS PUB 186.

Valid length for the modulus is any multiple of 64 in the range of 512 to 1024.

Use a SHA2withDSAKeyPairGenerator for generating parameters for 2048 and 3072 bits.

Version:

File Revision 9

See Also:

AlgorithmParameterGenerator, DSAParameters, DSAParams

Constructor Summary

Constructors

Constructor and Description
DSAParameterGenerator() The default constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected java.security.AlgorithmParameters	engineGenerateParameters() Actually generates the required DSA AlgorithmParameters.
protected void	engineInit(java.security.spec.AlgorithmParameterSpec param, java.security.SecureRandom random) Initializes this generator with some random seed.
protected void	engineInit(int primeLength, java.security.SecureRandom random) Initializes the parameter generator with given prime modulus length and random seed.

Methods inherited from class java.lang.Object

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

Constructor Detail

DSAParameterGenerator

public DSAParameterGenerator()

The default constructor. Only internally used for creating an DSAParameterGenerator object. Applications shall use one of the AlgorithmParameterGenerator.getInstance factory methods for obtaining an AlgorithmParamterGenerator for generating parameters for DSA signature algorithm.

Method Detail

engineInit

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

Initializes the parameter generator with given prime modulus length and random seed.

Specified by:

engineInit in class java.security.AlgorithmParameterGeneratorSpi

Parameters:

primeLength - the length of the prime modulus in bits

random - the random seed for this generator.

engineInit

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

Initializes this generator with some random seed. The parameters must be null.

Applications shall call init(param_spec, random) for provider independent access of this method.

Specified by:

engineInit in class java.security.AlgorithmParameterGeneratorSpi

Parameters:

param - must be null

random - the random seed to be used by this generator.

Throws:

java.security.InvalidAlgorithmParameterException - if param is not null.

engineGenerateParameters

protected java.security.AlgorithmParameters engineGenerateParameters()

Actually generates the required DSA AlgorithmParameters.

Applications shall call generatePrameters() for provider independently accessing this method.

Specified by:

engineGenerateParameters in class java.security.AlgorithmParameterGeneratorSpi

Returns:

the new created DSA AlgorithmParameters