http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.asn1.cmp;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERTaggedObject;
import org.bouncycastle.asn1.crmf.CertId;
import org.bouncycastle.asn1.x509.CertificateList;

public class RevRepContentBuilder
{
    private ASN1EncodableVector status = new ASN1EncodableVector();
    private ASN1EncodableVector revCerts = new ASN1EncodableVector();
    private ASN1EncodableVector crls = new ASN1EncodableVector();

    public RevRepContentBuilder add(PKIStatusInfo status)
    {
        this.status.add(status);

        return this;
    }

    public RevRepContentBuilder add(PKIStatusInfo status, CertId certId)
    {
        if (this.status.size() != this.revCerts.size())
        {
            throw new IllegalStateException("status and revCerts sequence must be in common order");
        }
        this.status.add(status);
        this.revCerts.add(certId);

        return this;
    }

    public RevRepContentBuilder addCrl(CertificateList crl)
    {
        this.crls.add(crl);

        return this;
    }

    public RevRepContent build()
    {
        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(new DERSequence(status));

        if (revCerts.size() != 0)
        {
            v.add(new DERTaggedObject(true, 0, new DERSequence(revCerts)));
        }

        if (crls.size() != 0)
        {
            v.add(new DERTaggedObject(true, 1, new DERSequence(crls)));
        }

        return RevRepContent.getInstance(new DERSequence(v));
    }
}