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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;

public class RC5Parameters
    implements CipherParameters
{
    private byte[]  key;
    private int     rounds;

    public RC5Parameters(
        byte[]  key,
        int     rounds)
    {
        if (key.length > 255)
        {
            throw new IllegalArgumentException("RC5 key length can be no greater than 255");
        }

        this.key = new byte[key.length];
        this.rounds = rounds;

        System.arraycopy(key, 0, this.key, 0, key.length);
    }

    public byte[] getKey()
    {
        return key;
    }

    public int getRounds()
    {
        return rounds;
    }
}