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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 org.spongycastle.crypto.CipherParameters;

/**
 * parameters for using an integrated cipher in stream mode.
 */
public class IESParameters
    implements CipherParameters
{
    private byte[]  derivation;
    private byte[]  encoding;
    private int     macKeySize;

    /**
     * @param derivation the derivation parameter for the KDF function.
     * @param encoding the encoding parameter for the KDF function.
     * @param macKeySize the size of the MAC key (in bits).
     */
    public IESParameters(
        byte[]  derivation,
        byte[]  encoding,
        int     macKeySize)
    {
        this.derivation = derivation;
        this.encoding = encoding;
        this.macKeySize = macKeySize;
    }

    public byte[] getDerivationV()
    {
        return derivation;
    }

    public byte[] getEncodingV()
    {
        return encoding;
    }

    public int getMacKeySize()
    {
        return macKeySize;
    }
}