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

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package org.bouncycastle.jcajce.provider.symmetric;

import org.bouncycastle.crypto.generators.Poly1305KeyGenerator;
import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;
import org.bouncycastle.jcajce.provider.symmetric.util.BaseKeyGenerator;
import org.bouncycastle.jcajce.provider.symmetric.util.BaseMac;
import org.bouncycastle.jcajce.provider.util.AlgorithmProvider;

public class Poly1305
{
    private Poly1305()
    {
    }

    public static class Mac
        extends BaseMac
    {
        public Mac()
        {
            super(new org.bouncycastle.crypto.macs.Poly1305());
        }
    }

    public static class KeyGen
        extends BaseKeyGenerator
    {
        public KeyGen()
        {
            super("Poly1305", 256, new Poly1305KeyGenerator());
        }
    }

    public static class Mappings
        extends AlgorithmProvider
    {
        private static final String PREFIX = Poly1305.class.getName();

        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("Mac.POLY1305", PREFIX + "$Mac");

            provider.addAlgorithm("KeyGenerator.POLY1305", PREFIX + "$KeyGen");
        }
    }
}