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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.jcajce.provider.symmetric;

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

public class Poly1305
{
    private Poly1305()
    {
    }

    public static class Mac
        extends BaseMac
    {
        public Mac()
        {
            super(new org.spongycastle.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");
        }
    }
}