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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 with debug enabled.

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package org.bouncycastle.pqc.crypto.xmss;

import org.bouncycastle.crypto.params.AsymmetricKeyParameter;

/**
 * XMSS Public Key.
 */
public final class XMSSPublicKeyParameters
    extends AsymmetricKeyParameter
    implements XMSSStoreableObjectInterface
{

    /**
     * XMSS parameters object.
     */
    private final XMSSParameters params;
    //private final int oid;
    private final byte[] root;
    private final byte[] publicSeed;

    private XMSSPublicKeyParameters(Builder builder)
    {
        super(false);
        params = builder.params;
        if (params == null)
        {
            throw new NullPointerException("params == null");
        }
        int n = params.getDigestSize();
        byte[] publicKey = builder.publicKey;
        if (publicKey != null)
        {
            /* import */
            // int oidSize = 4;
            int rootSize = n;
            int publicSeedSize = n;
            // int totalSize = oidSize + rootSize + publicSeedSize;
            int totalSize = rootSize + publicSeedSize;
            if (publicKey.length != totalSize)
            {
                throw new IllegalArgumentException("public key has wrong size");
            }
            int position = 0;
			/*
			 * oid = XMSSUtil.bytesToIntBigEndian(publicKey, position); if (oid !=
			 * xmss.getParams().getOid().getOid()) { throw new
			 * ParseException("public key not compatible with current instance parameters"
			 * , 0); } position += oidSize;
			 */
            root = XMSSUtil.extractBytesAtOffset(publicKey, position, rootSize);
            position += rootSize;
            publicSeed = XMSSUtil.extractBytesAtOffset(publicKey, position, publicSeedSize);
        }
        else
        {
			/* set */
            byte[] tmpRoot = builder.root;
            if (tmpRoot != null)
            {
                if (tmpRoot.length != n)
                {
                    throw new IllegalArgumentException("length of root must be equal to length of digest");
                }
                root = tmpRoot;
            }
            else
            {
                root = new byte[n];
            }
            byte[] tmpPublicSeed = builder.publicSeed;
            if (tmpPublicSeed != null)
            {
                if (tmpPublicSeed.length != n)
                {
                    throw new IllegalArgumentException("length of publicSeed must be equal to length of digest");
                }
                publicSeed = tmpPublicSeed;
            }
            else
            {
                publicSeed = new byte[n];
            }
        }
    }

    public static class Builder
    {

        /* mandatory */
        private final XMSSParameters params;
        /* optional */
        private byte[] root = null;
        private byte[] publicSeed = null;
        private byte[] publicKey = null;

        public Builder(XMSSParameters params)
        {
            super();
            this.params = params;
        }

        public Builder withRoot(byte[] val)
        {
            root = XMSSUtil.cloneArray(val);
            return this;
        }

        public Builder withPublicSeed(byte[] val)
        {
            publicSeed = XMSSUtil.cloneArray(val);
            return this;
        }

        public Builder withPublicKey(byte[] val)
        {
            publicKey = XMSSUtil.cloneArray(val);
            return this;
        }

        public XMSSPublicKeyParameters build()
        {
            return new XMSSPublicKeyParameters(this);
        }
    }

    public byte[] toByteArray()
    {
		/* oid || root || seed */
        int n = params.getDigestSize();
        // int oidSize = 4;
        int rootSize = n;
        int publicSeedSize = n;
        // int totalSize = oidSize + rootSize + publicSeedSize;
        int totalSize = rootSize + publicSeedSize;
        byte[] out = new byte[totalSize];
        int position = 0;
		/* copy oid */
		/*
		 * XMSSUtil.intToBytesBigEndianOffset(out, oid, position); position +=
		 * oidSize;
		 */
		/* copy root */
        XMSSUtil.copyBytesAtOffset(out, root, position);
        position += rootSize;
		/* copy public seed */
        XMSSUtil.copyBytesAtOffset(out, publicSeed, position);
        return out;
    }

    public byte[] getRoot()
    {
        return XMSSUtil.cloneArray(root);
    }

    public byte[] getPublicSeed()
    {
        return XMSSUtil.cloneArray(publicSeed);
    }

    public XMSSParameters getParameters()
     {
         return params;
     }
}