}
            der.writeObject(new DERTaggedObject(true, 1, new DERSequence(fields)));
            return collector.toByteArray();
        }
        catch ( IOException ex ) {
            throw new IllegalStateException(ex.getMessage());
        }
    }


    @Override
    protected void parse ( byte[] token ) throws IOException {
        try ( ASN1InputStream der = new ASN1InputStream(token) ) {