ev.add(new DERTaggedObject(true, 0, new DERSequence(fields)));
            ByteArrayOutputStream collector = new ByteArrayOutputStream();
            ASN1OutputStream der = ASN1OutputStream.create(collector, ASN1Encoding.DER);
            DERTaggedObject derApplicationSpecific = new DERTaggedObject(false, BERTags.APPLICATION, 0, new DERSequence(ev));
            der.writeObject(derApplicationSpecific);