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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 and up.

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package org.bouncycastle.crypto.params;

import java.math.BigInteger;

import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.util.Memoable;

public class CramerShoupParameters
    implements CipherParameters
{

    private BigInteger p; // prime order of G
    private BigInteger g1, g2; // generate G

    private Digest H; // hash function

    public CramerShoupParameters(BigInteger p, BigInteger g1, BigInteger g2, Digest H)
    {
        this.p = p;
        this.g1 = g1;
        this.g2 = g2;
        this.H = (Digest)((Memoable)H).copy();
        this.H.reset();
    }

    public boolean equals(Object obj)
    {
        if (!(obj instanceof CramerShoupParameters))
        {
            return false;
        }

        CramerShoupParameters pm = (CramerShoupParameters)obj;

        return (pm.getP().equals(p) && pm.getG1().equals(g1) && pm.getG2().equals(g2));
    }

    public int hashCode()
    {
        return getP().hashCode() ^ getG1().hashCode() ^ getG2().hashCode();
    }

    public BigInteger getG1()
    {
        return g1;
    }

    public BigInteger getG2()
    {
        return g2;
    }

    public BigInteger getP()
    {
        return p;
    }

    public Digest getH()
    {
        return (Digest)((Memoable)H).copy();
    }

}