http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
package org.bouncycastle.jce.spec;

import java.math.BigInteger;
import java.security.spec.AlgorithmParameterSpec;

public class ElGamalParameterSpec
    implements AlgorithmParameterSpec
{
    private BigInteger  p;
    private BigInteger  g;

    
Constructs a parameter set for Diffie-Hellman, using a prime modulus
p and a base generator g.

Params:
  • p – the prime modulus
  • g – the base generator
/**
     * Constructs a parameter set for Diffie-Hellman, using a prime modulus
     * <code>p</code> and a base generator <code>g</code>.
     * 
     * @param p the prime modulus
     * @param g the base generator
     */
    public ElGamalParameterSpec(
        BigInteger  p,
        BigInteger  g)
    {
        this.p = p;
        this.g = g;
    }

    
Returns the prime modulus p.

Returns:the prime modulus p
/**
     * Returns the prime modulus <code>p</code>.
     *
     * @return the prime modulus <code>p</code>
     */
    public BigInteger getP()
    {
        return p;
    }

    
Returns the base generator g.

Returns:the base generator g
/**
     * Returns the base generator <code>g</code>.
     *
     * @return the base generator <code>g</code>
     */
    public BigInteger getG()
    {
        return g;
    }
}