iaik.security.dsa

Class SHA2withDSAParameterSpec

java.lang.Object

java.security.spec.DSAParameterSpec

iaik.security.dsa.SHA2withDSAParameterSpec

All Implemented Interfaces:

java.security.interfaces.DSAParams, java.security.spec.AlgorithmParameterSpec

public class SHA2withDSAParameterSpec
extends java.security.spec.DSAParameterSpec

DSA parameter specification that provides access to the validation parameters counter and domain parameter seed (if set).

This class extends the JCA DSAParameterSpec to also allow to get the validation parameters counter and domain parameter seed (if set) that have been calculated during the DSA parameter generation procedure.

This class only may be used with an IAIK DSA SHA-2 algorithm parameter generator like SHA224withDSAParameterGenerator or SHA256withDSAParameterGenerator, e.g.:

 int L = 3072;
 int N = 256;
 SHA2withDSAGenParameterSpec genParamSpec = new SHA2withDSAGenParameterSpec(L, N);
 AlgorithmParameterGenerator generator = 
   AlgorithmParameterGenerator.getInstance("SHA256withDSA", "IAIK");
 SecureRandom random = ...;
 generator.init(genParamSpec, random);
 AlgortithmParameters params = generator.generateParameters();
 // get parameter specification  
 SHA2withDSAParameterSpec paramSpec = 
   (SHA2withDSAParameterSpec)params.getParameterSpec(SHA2withDSAParameterSpec.class);
 // get p
 BigInteger p = paramSpec.getP();  
 // get q
 BigInteger q = paramSpec.getQ();
 // get g
 BigInteger g = paramSpec.getG();
 // get counter (-1 if not set)
 int counter = paramSpec.getCounter();
 // get domain parameter seed (null if not set)
 byte[] seed = paramSpec.getSeed();
 

Constructor Summary

Constructors

Constructor and Description
SHA2withDSAParameterSpec(java.math.BigInteger p, java.math.BigInteger q, java.math.BigInteger g) Creates a DSAParameterSpec for given prime modulus, prime divisor and generator.

Method Summary

Methods

Modifier and Type	Method and Description
int	getCounter() Gets the counter value.
byte[]	getSeed() Gets the domain parameter seed.

Methods inherited from class java.security.spec.DSAParameterSpec

getG, getP, getQ

Methods inherited from class java.lang.Object

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

Constructor Detail

SHA2withDSAParameterSpec

public SHA2withDSAParameterSpec(java.math.BigInteger p,
                        java.math.BigInteger q,
                        java.math.BigInteger g)

Creates a DSAParameterSpec for given prime modulus, prime divisor and generator.

Parameters:

p - the prime modulus

q - the prime divisor

g - the generator

Method Detail

getCounter

public int getCounter()

Gets the counter value. May be required for parameter validation.

Returns:

the counter value from the parameter generation procedure, or -1 if the counter has not been set

getSeed

public byte[] getSeed()

Gets the domain parameter seed. May be required for parameter validation.

Returns:

the domain parameter seed from the parameter generation procedure, or null if the domain parameter seed has not been set