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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.5 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.PrivateKey;

import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.crypto.CipherParameters;
import org.bouncycastle.pqc.crypto.qtesla.QTESLAPrivateKeyParameters;
import org.bouncycastle.pqc.crypto.qtesla.QTESLASecurityCategory;
import org.bouncycastle.pqc.crypto.util.PrivateKeyFactory;
import org.bouncycastle.pqc.crypto.util.PrivateKeyInfoFactory;
import org.bouncycastle.pqc.jcajce.interfaces.QTESLAKey;
import org.bouncycastle.pqc.jcajce.spec.QTESLAParameterSpec;
import org.bouncycastle.util.Arrays;

public class BCqTESLAPrivateKey
    implements PrivateKey, QTESLAKey
{
    private static final long serialVersionUID = 1L;

    private transient QTESLAPrivateKeyParameters keyParams;
    private transient ASN1Set attributes;

    public BCqTESLAPrivateKey(
        QTESLAPrivateKeyParameters keyParams)
    {
        this.keyParams = keyParams;
    }

    public BCqTESLAPrivateKey(PrivateKeyInfo keyInfo)
        throws IOException
    {
        init(keyInfo);
    }

    private void init(PrivateKeyInfo keyInfo)
        throws IOException
    {
        this.attributes = keyInfo.getAttributes();
        this.keyParams = (QTESLAPrivateKeyParameters)PrivateKeyFactory.createKey(keyInfo);
    }

    /**
     * @return name of the algorithm
     */
    public final String getAlgorithm()
    {
        return QTESLASecurityCategory.getName(keyParams.getSecurityCategory());
    }

    public String getFormat()
    {
        return "PKCS#8";
    }

    public QTESLAParameterSpec getParams()
    {
        return new QTESLAParameterSpec(getAlgorithm());
    }

    public byte[] getEncoded()
    {
        PrivateKeyInfo pki;
        try
        {
            pki = PrivateKeyInfoFactory.createPrivateKeyInfo(keyParams, attributes);

            return pki.getEncoded();
        }
        catch (IOException e)
        {
            return null;
        }
    }

    public boolean equals(Object o)
    {
        if (o == this)
        {
            return true;
        }

        if (o instanceof BCqTESLAPrivateKey)
        {
            BCqTESLAPrivateKey otherKey = (BCqTESLAPrivateKey)o;

            return keyParams.getSecurityCategory() == otherKey.keyParams.getSecurityCategory()
                && Arrays.areEqual(keyParams.getSecret(), otherKey.keyParams.getSecret());
        }

        return false;
    }

    public int hashCode()
    {
        return keyParams.getSecurityCategory() + 37 * Arrays.hashCode(keyParams.getSecret());
    }

    CipherParameters getKeyParams()
    {
        return keyParams;
    }

    private void readObject(
        ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        in.defaultReadObject();

        byte[] enc = (byte[])in.readObject();

        init(PrivateKeyInfo.getInstance(enc));
    }

    private void writeObject(
        ObjectOutputStream out)
        throws IOException
    {
        out.defaultWriteObject();

        out.writeObject(this.getEncoded());
    }
}