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.security.spec.AlgorithmParameterSpec;

public class ElGamalGenParameterSpec
    implements AlgorithmParameterSpec
{
    private int primeSize;

    /*
     * @param primeSize the size (in bits) of the prime modulus.
     */
    public ElGamalGenParameterSpec(
        int     primeSize)
    {
        this.primeSize = primeSize;
    }

    
Returns the size in bits of the prime modulus.

Returns:the size in bits of the prime modulus
/**
     * Returns the size in bits of the prime modulus.
     *
     * @return the size in bits of the prime modulus
     */
    public int getPrimeSize()
    {
        return primeSize;
    }
}