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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.pqc.jcajce.provider;

import org.bouncycastle.jcajce.provider.config.ConfigurableProvider;
import org.bouncycastle.jcajce.provider.util.AsymmetricAlgorithmProvider;
import org.bouncycastle.jcajce.provider.util.AsymmetricKeyInfoConverter;
import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;
import org.bouncycastle.pqc.jcajce.provider.rainbow.RainbowKeyFactorySpi;

public class Rainbow
{
    private static final String PREFIX = "org.bouncycastle.pqc.jcajce.provider" + ".rainbow.";

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

        public void configure(ConfigurableProvider provider)
        {
            provider.addAlgorithm("KeyFactory.Rainbow", PREFIX + "RainbowKeyFactorySpi");
            provider.addAlgorithm("KeyPairGenerator.Rainbow", PREFIX + "RainbowKeyPairGeneratorSpi");

            addSignatureAlgorithm(provider, "SHA224", "Rainbow", PREFIX + "SignatureSpi$withSha224", PQCObjectIdentifiers.rainbowWithSha224);
            addSignatureAlgorithm(provider, "SHA256", "Rainbow", PREFIX + "SignatureSpi$withSha256", PQCObjectIdentifiers.rainbowWithSha256);
            addSignatureAlgorithm(provider, "SHA384", "Rainbow", PREFIX + "SignatureSpi$withSha384", PQCObjectIdentifiers.rainbowWithSha384);
            addSignatureAlgorithm(provider, "SHA512", "Rainbow", PREFIX + "SignatureSpi$withSha512", PQCObjectIdentifiers.rainbowWithSha512);

            AsymmetricKeyInfoConverter keyFact = new RainbowKeyFactorySpi();

            registerOid(provider, PQCObjectIdentifiers.rainbow, "Rainbow", keyFact);
        }
    }
}