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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.pqc.jcajce.provider;

import org.spongycastle.jcajce.provider.config.ConfigurableProvider;
import org.spongycastle.jcajce.provider.util.AsymmetricAlgorithmProvider;
import org.spongycastle.jcajce.provider.util.AsymmetricKeyInfoConverter;
import org.spongycastle.pqc.asn1.PQCObjectIdentifiers;
import org.spongycastle.pqc.jcajce.provider.sphincs.Sphincs256KeyFactorySpi;

public class SPHINCS
{
    private static final String PREFIX = "org.spongycastle.pqc.jcajce.provider" + ".sphincs.";

    public static class Mappings
        extends AsymmetricAlgorithmProvider
    {
        public Mappings()
        {
        }

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("KeyFactory.SPHINCS256", PREFIX + "Sphincs256KeyFactorySpi");
            provider.addAlgorithm("KeyPairGenerator.SPHINCS256", PREFIX + "Sphincs256KeyPairGeneratorSpi");

            addSignatureAlgorithm(provider, "SHA512", "SPHINCS256", PREFIX + "SignatureSpi$withSha512", PQCObjectIdentifiers.sphincs256_with_SHA512);
            addSignatureAlgorithm(provider, "SHA3-512", "SPHINCS256", PREFIX + "SignatureSpi$withSha3_512", PQCObjectIdentifiers.sphincs256_with_SHA3_512);

            AsymmetricKeyInfoConverter keyFact = new Sphincs256KeyFactorySpi();

            registerOid(provider, PQCObjectIdentifiers.sphincs256, "SPHINCS256", keyFact);
            registerOidAlgorithmParameters(provider, PQCObjectIdentifiers.sphincs256, "SPHINCS256");
        }
    }
}