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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;

/**
 * base interface for general purpose byte derivation functions.
 */
public interface DerivationFunction
{
    public void init(DerivationParameters param);

    /**
     * return the message digest used as the basis for the function
     */
    public Digest getDigest();

    public int generateBytes(byte[] out, int outOff, int len)
        throws DataLengthException, IllegalArgumentException;
}