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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 to JDK 1.8.

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package org.bouncycastle.pqc.jcajce.provider.xmss;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.nist.NISTObjectIdentifiers;
import org.bouncycastle.crypto.Digest;
import org.bouncycastle.crypto.digests.SHA256Digest;
import org.bouncycastle.crypto.digests.SHA512Digest;
import org.bouncycastle.crypto.digests.SHAKEDigest;
import org.bouncycastle.pqc.jcajce.spec.XMSSParameterSpec;

class DigestUtil
{
    static Digest getDigest(ASN1ObjectIdentifier oid)
    {
        if (oid.equals(NISTObjectIdentifiers.id_sha256))
        {
            return new SHA256Digest();
        }
        if (oid.equals(NISTObjectIdentifiers.id_sha512))
        {
            return new SHA512Digest();
        }
        if (oid.equals(NISTObjectIdentifiers.id_shake128))
        {
            return new SHAKEDigest(128);
        }
        if (oid.equals(NISTObjectIdentifiers.id_shake256))
        {
            return new SHAKEDigest(256);
        }

        throw new IllegalArgumentException("unrecognized digest OID: " + oid);
    }

    static ASN1ObjectIdentifier getDigestOID(String digest)
    {
        if (digest.equals("SHA-256"))
        {
            return NISTObjectIdentifiers.id_sha256;
        }
        if (digest.equals("SHA-512"))
        {
            return NISTObjectIdentifiers.id_sha512;
        }
        if (digest.equals("SHAKE128"))
        {
            return NISTObjectIdentifiers.id_shake128;
        }
        if (digest.equals("SHAKE256"))
        {
            return NISTObjectIdentifiers.id_shake256;
        }

        throw new IllegalArgumentException("unrecognized digest: " + digest);
    }

    public static byte[] getDigestResult(Digest digest)
    {
        byte[] hash = new byte[digest.getDigestSize()];

        digest.doFinal(hash, 0);

        return hash;
    }

    public static String getXMSSDigestName(ASN1ObjectIdentifier treeDigest)
    {
        if (treeDigest.equals(NISTObjectIdentifiers.id_sha256))
        {
            return XMSSParameterSpec.SHA256;
        }
        if (treeDigest.equals(NISTObjectIdentifiers.id_sha512))
        {
            return XMSSParameterSpec.SHA512;
        }
        if (treeDigest.equals(NISTObjectIdentifiers.id_shake128))
        {
            return XMSSParameterSpec.SHAKE128;
        }
        if (treeDigest.equals(NISTObjectIdentifiers.id_shake256))
        {
            return XMSSParameterSpec.SHAKE256;
        }

        throw new IllegalArgumentException("unrecognized digest OID: " + treeDigest);
    }

    static class DoubleDigest
        implements Digest
    {
        private SHAKEDigest digest;

        DoubleDigest(SHAKEDigest digest)
        {
             this.digest = digest;
        }

        @Override
        public String getAlgorithmName()
        {
            return digest.getAlgorithmName() + "/" + (digest.getDigestSize() * 2 * 8);
        }

        @Override
        public int getDigestSize()
        {
            return digest.getDigestSize() * 2;
        }

        @Override
        public void update(byte in)
        {
             digest.update(in);
        }

        @Override
        public void update(byte[] in, int inOff, int len)
        {
            digest.update(in, inOff, len);
        }

        @Override
        public int doFinal(byte[] out, int outOff)
        {
            return digest.doFinal(out, outOff, this.getDigestSize());
        }

        @Override
        public void reset()
        {
            digest.reset();
        }
    }
}