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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.crypto.util;

import java.io.IOException;
import java.io.InputStream;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.bc.BCObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.pqc.asn1.PQCObjectIdentifiers;
import org.bouncycastle.pqc.asn1.SPHINCS256KeyParams;
import org.bouncycastle.pqc.asn1.XMSSKeyParams;
import org.bouncycastle.pqc.asn1.XMSSMTKeyParams;
import org.bouncycastle.pqc.asn1.XMSSMTPrivateKey;
import org.bouncycastle.pqc.asn1.XMSSPrivateKey;
import org.bouncycastle.pqc.crypto.newhope.NHPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.qtesla.QTESLAPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.sphincs.SPHINCSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.BDS;
import org.bouncycastle.pqc.crypto.xmss.BDSStateMap;
import org.bouncycastle.pqc.crypto.xmss.XMSSMTParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSMTPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.xmss.XMSSUtil;
import org.bouncycastle.util.Pack;

/**
 * Factory for creating private key objects from PKCS8 PrivateKeyInfo objects.
 */
public class PrivateKeyFactory
{
    /**
     * Create a private key parameter from a PKCS8 PrivateKeyInfo encoding.
     * 
     * @param privateKeyInfoData the PrivateKeyInfo encoding
     * @return a suitable private key parameter
     * @throws IOException on an error decoding the key
     */
    public static AsymmetricKeyParameter createKey(byte[] privateKeyInfoData) throws IOException
    {
        return createKey(PrivateKeyInfo.getInstance(ASN1Primitive.fromByteArray(privateKeyInfoData)));
    }

    /**
     * Create a private key parameter from a PKCS8 PrivateKeyInfo encoding read from a
     * stream.
     * 
     * @param inStr the stream to read the PrivateKeyInfo encoding from
     * @return a suitable private key parameter
     * @throws IOException on an error decoding the key
     */
    public static AsymmetricKeyParameter createKey(InputStream inStr) throws IOException
    {
        return createKey(PrivateKeyInfo.getInstance(new ASN1InputStream(inStr).readObject()));
    }

    /**
     * Create a private key parameter from the passed in PKCS8 PrivateKeyInfo object.
     * 
     * @param keyInfo the PrivateKeyInfo object containing the key material
     * @return a suitable private key parameter
     * @throws IOException on an error decoding the key
     */
    public static AsymmetricKeyParameter createKey(PrivateKeyInfo keyInfo) throws IOException
    {
        AlgorithmIdentifier algId = keyInfo.getPrivateKeyAlgorithm();
        ASN1ObjectIdentifier algOID = algId.getAlgorithm();

        if (algOID.on(BCObjectIdentifiers.qTESLA))
        {
            ASN1OctetString qTESLAPriv = ASN1OctetString.getInstance(keyInfo.parsePrivateKey());

            return new QTESLAPrivateKeyParameters(Utils.qTeslaLookupSecurityCategory(keyInfo.getPrivateKeyAlgorithm()), qTESLAPriv.getOctets());
        }
        else if (algOID.equals(BCObjectIdentifiers.sphincs256))
        {
            return new SPHINCSPrivateKeyParameters(ASN1OctetString.getInstance(keyInfo.parsePrivateKey()).getOctets(),
                Utils.sphincs256LookupTreeAlgName(SPHINCS256KeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters())));
        }
        else if (algOID.equals(BCObjectIdentifiers.newHope))
        {
            return new NHPrivateKeyParameters(convert(ASN1OctetString.getInstance(keyInfo.parsePrivateKey()).getOctets()));
        }
        else if (algOID.equals(BCObjectIdentifiers.xmss))
        {
            XMSSKeyParams keyParams = XMSSKeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters());
            ASN1ObjectIdentifier treeDigest = keyParams.getTreeDigest().getAlgorithm();

            XMSSPrivateKey xmssPrivateKey = XMSSPrivateKey.getInstance(keyInfo.parsePrivateKey());

            try
            {
                XMSSPrivateKeyParameters.Builder keyBuilder = new XMSSPrivateKeyParameters
                    .Builder(new XMSSParameters(keyParams.getHeight(), Utils.getDigest(treeDigest)))
                    .withIndex(xmssPrivateKey.getIndex())
                    .withSecretKeySeed(xmssPrivateKey.getSecretKeySeed())
                    .withSecretKeyPRF(xmssPrivateKey.getSecretKeyPRF())
                    .withPublicSeed(xmssPrivateKey.getPublicSeed())
                    .withRoot(xmssPrivateKey.getRoot());

                if (xmssPrivateKey.getVersion() != 0)
                {
                    keyBuilder.withMaxIndex(xmssPrivateKey.getMaxIndex());
                }

                if (xmssPrivateKey.getBdsState() != null)
                {
                    BDS bds = (BDS)XMSSUtil.deserialize(xmssPrivateKey.getBdsState(), BDS.class);
                    keyBuilder.withBDSState(bds.withWOTSDigest(treeDigest));
                }

                return keyBuilder.build();
            }
            catch (ClassNotFoundException e)
            {
                throw new IOException("ClassNotFoundException processing BDS state: " + e.getMessage());
            }
        }
        else if (algOID.equals(PQCObjectIdentifiers.xmss_mt))
        {
            XMSSMTKeyParams keyParams = XMSSMTKeyParams.getInstance(keyInfo.getPrivateKeyAlgorithm().getParameters());
            ASN1ObjectIdentifier treeDigest = keyParams.getTreeDigest().getAlgorithm();

            try
            {
                XMSSMTPrivateKey xmssMtPrivateKey = XMSSMTPrivateKey.getInstance(keyInfo.parsePrivateKey());

                XMSSMTPrivateKeyParameters.Builder keyBuilder = new XMSSMTPrivateKeyParameters
                    .Builder(new XMSSMTParameters(keyParams.getHeight(), keyParams.getLayers(), Utils.getDigest(treeDigest)))
                    .withIndex(xmssMtPrivateKey.getIndex())
                    .withSecretKeySeed(xmssMtPrivateKey.getSecretKeySeed())
                    .withSecretKeyPRF(xmssMtPrivateKey.getSecretKeyPRF())
                    .withPublicSeed(xmssMtPrivateKey.getPublicSeed())
                    .withRoot(xmssMtPrivateKey.getRoot());

                if (xmssMtPrivateKey.getVersion() != 0)
                {
                    keyBuilder.withMaxIndex(xmssMtPrivateKey.getMaxIndex());
                }

                if (xmssMtPrivateKey.getBdsState() != null)
                {
                    BDSStateMap bdsState = (BDSStateMap)XMSSUtil.deserialize(xmssMtPrivateKey.getBdsState(), BDSStateMap.class);
                    keyBuilder.withBDSState(bdsState.withWOTSDigest(treeDigest));
                }

                return keyBuilder.build();
            }
            catch (ClassNotFoundException e)
            {
                throw new IOException("ClassNotFoundException processing BDS state: " + e.getMessage());
            }
        }
        else
        {
            throw new RuntimeException("algorithm identifier in private key not recognised");
        }
    }

    private static short[] convert(byte[] octets)
    {
        short[] rv = new short[octets.length / 2];

        for (int i = 0; i != rv.length; i++)
        {
            rv[i] = Pack.littleEndianToShort(octets, i * 2);
        }

        return rv;
    }
}