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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.tsp.test;

import java.io.IOException;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.Date;

import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AuthorityKeyIdentifier;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.ExtendedKeyUsage;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.KeyPurposeId;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.asn1.x509.X509Name;
import org.bouncycastle.cert.jcajce.JcaX509ExtensionUtils;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.x509.X509V3CertificateGenerator;

public class TSPTestUtil
{

    public static SecureRandom rand = new SecureRandom();

    public static KeyPairGenerator kpg;

    public static KeyGenerator desede128kg;

    public static KeyGenerator desede192kg;

    public static KeyGenerator rc240kg;

    public static KeyGenerator rc264kg;

    public static KeyGenerator rc2128kg;

    public static BigInteger serialNumber = BigInteger.ONE;

    public static final boolean DEBUG = true;

    public static ASN1ObjectIdentifier EuroPKI_TSA_Test_Policy = new ASN1ObjectIdentifier(
            "1.3.6.1.4.1.5255.5.1");

    public static JcaX509ExtensionUtils extUtils;

    static
    {
        try
        {
            rand = new SecureRandom();

            kpg = KeyPairGenerator.getInstance("RSA", "BC");
            kpg.initialize(1024, rand);

            desede128kg = KeyGenerator.getInstance("DESEDE", "BC");
            desede128kg.init(112, rand);

            desede192kg = KeyGenerator.getInstance("DESEDE", "BC");
            desede192kg.init(168, rand);

            rc240kg = KeyGenerator.getInstance("RC2", "BC");
            rc240kg.init(40, rand);

            rc264kg = KeyGenerator.getInstance("RC2", "BC");
            rc264kg.init(64, rand);

            rc2128kg = KeyGenerator.getInstance("RC2", "BC");
            rc2128kg.init(128, rand);

            serialNumber = new BigInteger("1");

            extUtils = new JcaX509ExtensionUtils();

        }
        catch (Exception ex)
        {
            throw new RuntimeException(ex.toString());
        }
    }

    public static String dumpBase64(byte[] data)
    {
        StringBuffer buf = new StringBuffer();

        data = Base64.encode(data);

        for (int i = 0; i < data.length; i += 64)
        {
            if (i + 64 < data.length)
            {
                buf.append(new String(data, i, 64));
            }
            else
            {
                buf.append(new String(data, i, data.length - i));
            }
            buf.append('\n');
        }

        return buf.toString();
    }

    public static KeyPair makeKeyPair()
    {
        return kpg.generateKeyPair();
    }

    public static SecretKey makeDesede128Key()
    {
        return desede128kg.generateKey();
    }

    public static SecretKey makeDesede192Key()
    {
        return desede192kg.generateKey();
    }

    public static SecretKey makeRC240Key()
    {
        return rc240kg.generateKey();
    }

    public static SecretKey makeRC264Key()
    {
        return rc264kg.generateKey();
    }

    public static SecretKey makeRC2128Key()
    {
        return rc2128kg.generateKey();
    }

    public static X509Certificate makeCertificate(KeyPair _subKP,
            String _subDN, KeyPair _issKP, String _issDN)
            throws GeneralSecurityException, IOException
    {

        return makeCertificate(_subKP, _subDN, _issKP, _issDN, false);
    }

    public static X509Certificate makeCACertificate(KeyPair _subKP,
            String _subDN, KeyPair _issKP, String _issDN)
            throws GeneralSecurityException, IOException
    {

        return makeCertificate(_subKP, _subDN, _issKP, _issDN, true);
    }

    public static X509Certificate makeCertificate(KeyPair _subKP,
            String _subDN, KeyPair _issKP, String _issDN, boolean _ca)
            throws GeneralSecurityException, IOException
    {

        PublicKey _subPub = _subKP.getPublic();
        PrivateKey _issPriv = _issKP.getPrivate();
        PublicKey _issPub = _issKP.getPublic();

        X509V3CertificateGenerator _v3CertGen = new X509V3CertificateGenerator();

        _v3CertGen.reset();
        _v3CertGen.setSerialNumber(allocateSerialNumber());
        _v3CertGen.setIssuerDN(new X509Name(_issDN));
        _v3CertGen.setNotBefore(new Date(System.currentTimeMillis()));
        _v3CertGen.setNotAfter(new Date(System.currentTimeMillis()
                + (1000L * 60 * 60 * 24 * 100)));
        _v3CertGen.setSubjectDN(new X509Name(_subDN));
        _v3CertGen.setPublicKey(_subPub);
        _v3CertGen.setSignatureAlgorithm("MD5WithRSAEncryption");

        _v3CertGen.addExtension(Extension.subjectKeyIdentifier, false,
                createSubjectKeyId(_subPub));

        _v3CertGen.addExtension(Extension.authorityKeyIdentifier, false,
                createAuthorityKeyId(_issPub));

        if (_ca)
        {
            _v3CertGen.addExtension(Extension.basicConstraints, false,
                    new BasicConstraints(_ca));
        }
        else
        {
            _v3CertGen.addExtension(Extension.extendedKeyUsage, true,
                    new ExtendedKeyUsage(KeyPurposeId.id_kp_timeStamping));
        }

        X509Certificate _cert = _v3CertGen.generate(_issPriv);

        _cert.checkValidity(new Date());
        _cert.verify(_issPub);

        return _cert;
    }

    /*  
     *  
     *  INTERNAL METHODS
     *  
     */


    private static AuthorityKeyIdentifier createAuthorityKeyId(PublicKey _pubKey)
            throws IOException
    {
        return extUtils.createAuthorityKeyIdentifier(_pubKey);
    }

    private static SubjectKeyIdentifier createSubjectKeyId(PublicKey _pubKey)
            throws IOException
    {
        return extUtils.createSubjectKeyIdentifier(_pubKey);
    }

    private static BigInteger allocateSerialNumber()
    {
        BigInteger _tmp = serialNumber;
        serialNumber = serialNumber.add(BigInteger.ONE);
        return _tmp;
    }
}