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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.jce.provider;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPrivateKey;
import java.security.spec.DSAParameterSpec;
import java.security.spec.DSAPrivateKeySpec;
import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.DSAPrivateKeyParameters;
import org.bouncycastle.jcajce.provider.asymmetric.util.PKCS12BagAttributeCarrierImpl;
import org.bouncycastle.jce.interfaces.PKCS12BagAttributeCarrier;

public class JDKDSAPrivateKey
    implements DSAPrivateKey, PKCS12BagAttributeCarrier
{
    private static final long serialVersionUID = -4677259546958385734L;

    BigInteger          x;
    DSAParams           dsaSpec;

    private PKCS12BagAttributeCarrierImpl   attrCarrier = new PKCS12BagAttributeCarrierImpl();

    protected JDKDSAPrivateKey()
    {
    }

    JDKDSAPrivateKey(
        DSAPrivateKey    key)
    {
        this.x = key.getX();
        this.dsaSpec = key.getParams();
    }

    JDKDSAPrivateKey(
        DSAPrivateKeySpec    spec)
    {
        this.x = spec.getX();
        this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
    }

    JDKDSAPrivateKey(
        PrivateKeyInfo  info)
        throws IOException
    {
        DSAParameter    params = DSAParameter.getInstance(info.getPrivateKeyAlgorithm().getParameters());
        ASN1Integer      derX = ASN1Integer.getInstance(info.parsePrivateKey());

        this.x = derX.getValue();
        this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
    }

    JDKDSAPrivateKey(
        DSAPrivateKeyParameters  params)
    {
        this.x = params.getX();
        this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
    }

    public String getAlgorithm()
    {
        return "DSA";
    }

    /**
     * return the encoding format we produce in getEncoded().
     *
     * @return the string "PKCS#8"
     */
    public String getFormat()
    {
        return "PKCS#8";
    }

    /**
     * Return a PKCS8 representation of the key. The sequence returned
     * represents a full PrivateKeyInfo object.
     *
     * @return a PKCS8 representation of the key.
     */
    public byte[] getEncoded()
    {
        try
        {
            PrivateKeyInfo          info = new PrivateKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG())), new ASN1Integer(getX()));

            return info.getEncoded(ASN1Encoding.DER);
        }
        catch (IOException e)
        {
            return null;
        }
    }

    public DSAParams getParams()
    {
        return dsaSpec;
    }

    public BigInteger getX()
    {
        return x;
    }

    public boolean equals(
        Object o)
    {
        if (!(o instanceof DSAPrivateKey))
        {
            return false;
        }
        
        DSAPrivateKey other = (DSAPrivateKey)o;
        
        return this.getX().equals(other.getX()) 
            && this.getParams().getG().equals(other.getParams().getG()) 
            && this.getParams().getP().equals(other.getParams().getP()) 
            && this.getParams().getQ().equals(other.getParams().getQ());
    }

    public int hashCode()
    {
        return this.getX().hashCode() ^ this.getParams().getG().hashCode()
                ^ this.getParams().getP().hashCode() ^ this.getParams().getQ().hashCode();
    }
    
    public void setBagAttribute(
        ASN1ObjectIdentifier oid,
        ASN1Encodable attribute)
    {
        attrCarrier.setBagAttribute(oid, attribute);
    }

    public ASN1Encodable getBagAttribute(
        ASN1ObjectIdentifier oid)
    {
        return attrCarrier.getBagAttribute(oid);
    }

    public Enumeration getBagAttributeKeys()
    {
        return attrCarrier.getBagAttributeKeys();
    }

    private void readObject(
        ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        this.x = (BigInteger)in.readObject();
        this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject());
        this.attrCarrier = new PKCS12BagAttributeCarrierImpl();
        
        attrCarrier.readObject(in);
    }

    private void writeObject(
        ObjectOutputStream out)
        throws IOException
    {
        out.writeObject(x);
        out.writeObject(dsaSpec.getP());
        out.writeObject(dsaSpec.getQ());
        out.writeObject(dsaSpec.getG());

        attrCarrier.writeObject(out);
    }
}