if ( mechanismListMIC != null ) {
                fields.add(new DERTaggedObject(true, 3, new DEROctetString(mechanismListMIC)));
            }
            der.writeObject(new DERTaggedObject(true, 1, new DERSequence(fields)));
            return collector.toByteArray();
        }
        catch ( IOException ex ) {
            throw new IllegalStateException(ex.getMessage());
        }

            ASN1OutputStream der = ASN1OutputStream.create(collector, ASN1Encoding.DER);
            DERTaggedObject derApplicationSpecific = new DERTaggedObject(false, BERTags.APPLICATION, 0, new DERSequence(ev));
            der.writeObject(derApplicationSpecific);
            return collector.toByteArray();
        }
        catch ( IOException ex ) {
            throw new IllegalStateException(ex.getMessage());
        }
    }

        try {
            ByteArrayOutputStream bos = new ByteArrayOutputStream();
            ASN1OutputStream dos = ASN1OutputStream.create(bos, ASN1Encoding.DER);
            dos.writeObject(new DERSequence(mechs));
            dos.close();
            return bos.toByteArray();
        }
        catch ( IOException e ) {
            throw new CIFSException("Failed to encode mechList", e);
        }