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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.7.

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package org.spongycastle.jcajce.provider.symmetric;

import org.spongycastle.crypto.CipherKeyGenerator;
import org.spongycastle.crypto.engines.SerpentEngine;
import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jcajce.provider.symmetric.util.BaseBlockCipher;
import org.spongycastle.jcajce.provider.symmetric.util.BaseKeyGenerator;
import org.spongycastle.jcajce.provider.symmetric.util.IvAlgorithmParameters;
import org.spongycastle.jcajce.provider.util.AlgorithmProvider;

public final class Serpent
{
    private Serpent()
    {
    }
    
    public static class ECB
        extends BaseBlockCipher
    {
        public ECB()
        {
            super(new SerpentEngine());
        }
    }

    public static class KeyGen
        extends BaseKeyGenerator
    {
        public KeyGen()
        {
            super("Serpent", 192, new CipherKeyGenerator());
        }
    }

    public static class AlgParams
        extends IvAlgorithmParameters
    {
        protected String engineToString()
        {
            return "Serpent IV";
        }
    }

    public static class Mappings
        extends AlgorithmProvider
    {
        private static final String PREFIX = Serpent.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {

            provider.addAlgorithm("Cipher.Serpent", PREFIX + "$ECB");
            provider.addAlgorithm("KeyGenerator.Serpent", PREFIX + "$KeyGen");
            provider.addAlgorithm("AlgorithmParameters.Serpent", PREFIX + "$AlgParams");

        }
    }
}