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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.crypto.params;

import java.math.BigInteger;

public class DHPrivateKeyParameters
    extends DHKeyParameters
{
    private BigInteger      x;

    public DHPrivateKeyParameters(
        BigInteger      x,
        DHParameters    params)
    {
        super(true, params);

        this.x = x;
    }   

    public BigInteger getX()
    {
        return x;
    }

    public int hashCode()
    {
        return x.hashCode() ^ super.hashCode();
    }
    
    public boolean equals(
        Object  obj)
    {
        if (!(obj instanceof DHPrivateKeyParameters))
        {
            return false;
        }

        DHPrivateKeyParameters  other = (DHPrivateKeyParameters)obj;

        return other.getX().equals(this.x) && super.equals(obj);
    }
}