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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.asn1.x509;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1UTCTime;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.x500.X500Name;

/**
 * Generator for Version 1 TBSCertificateStructures.
 *  * TBSCertificate ::= SEQUENCE {
 *      version          [ 0 ]  Version DEFAULT v1(0),
 *      serialNumber            CertificateSerialNumber,
 *      signature               AlgorithmIdentifier,
 *      issuer                  Name,
 *      validity                Validity,
 *      subject                 Name,
 *      subjectPublicKeyInfo    SubjectPublicKeyInfo,
 *      }
 * 
 *
 */
public class V1TBSCertificateGenerator
{
    DERTaggedObject         version = new DERTaggedObject(true, 0, new ASN1Integer(0));

    ASN1Integer              serialNumber;
    AlgorithmIdentifier     signature;
    X500Name                issuer;
    Time                    startDate, endDate;
    X500Name                subject;
    SubjectPublicKeyInfo    subjectPublicKeyInfo;

    public V1TBSCertificateGenerator()
    {
    }

    public void setSerialNumber(
        ASN1Integer  serialNumber)
    {
        this.serialNumber = serialNumber;
    }

    public void setSignature(
        AlgorithmIdentifier    signature)
    {
        this.signature = signature;
    }

        /**
     * @deprecated use X500Name method
     */
    public void setIssuer(
        X509Name    issuer)
    {
        this.issuer = X500Name.getInstance(issuer.toASN1Primitive());
    }

    public void setIssuer(
        X500Name issuer)
    {
        this.issuer = issuer;
    }

    public void setStartDate(
        Time startDate)
    {
        this.startDate = startDate;
    }

    public void setStartDate(
        ASN1UTCTime startDate)
    {
        this.startDate = new Time(startDate);
    }

    public void setEndDate(
        Time endDate)
    {
        this.endDate = endDate;
    }

    public void setEndDate(
        ASN1UTCTime endDate)
    {
        this.endDate = new Time(endDate);
    }

    /**
     * @deprecated use X500Name method
     */
    public void setSubject(
        X509Name    subject)
    {
        this.subject = X500Name.getInstance(subject.toASN1Primitive());
    }

    public void setSubject(
        X500Name subject)
    {
        this.subject = subject;
    }

    public void setSubjectPublicKeyInfo(
        SubjectPublicKeyInfo    pubKeyInfo)
    {
        this.subjectPublicKeyInfo = pubKeyInfo;
    }

    public TBSCertificate generateTBSCertificate()
    {
        if ((serialNumber == null) || (signature == null)
            || (issuer == null) || (startDate == null) || (endDate == null)
            || (subject == null) || (subjectPublicKeyInfo == null))
        {
            throw new IllegalStateException("not all mandatory fields set in V1 TBScertificate generator");
        }

        ASN1EncodableVector seq = new ASN1EncodableVector(6);

        // seq.add(version); - not required as default value.
        seq.add(serialNumber);
        seq.add(signature);
        seq.add(issuer);

        //
        // before and after dates
        //
        {
            ASN1EncodableVector validity = new ASN1EncodableVector(2);
            validity.add(startDate);
            validity.add(endDate);

            seq.add(new DERSequence(validity));
        }

        seq.add(subject);

        seq.add(subjectPublicKeyInfo);

        return TBSCertificate.getInstance(new DERSequence(seq));
    }
}