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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.crypto.params;

import java.security.SecureRandom;

import org.spongycastle.crypto.KeyGenerationParameters;

public class DHKeyGenerationParameters
    extends KeyGenerationParameters
{
    private DHParameters    params;

    public DHKeyGenerationParameters(
        SecureRandom    random,
        DHParameters    params)
    {
        super(random, getStrength(params));

        this.params = params;
    }

    public DHParameters getParameters()
    {
        return params;
    }

    static int getStrength(DHParameters params)
    {
        return params.getL() != 0 ? params.getL() : params.getP().bitLength();
    }
}