DERObject oct = (DERObject) (new ASN1InputStream(new ByteArrayInputStream(altName)).readObject());
DERObject oct = (new ASN1InputStream(new ByteArrayInputStream(altName)).readObject());
    private static ASN1Sequence getAltnameSequence(List listitem) throws IOException {        Integer no = (Integer) listitem.get(0);        if (no.intValue() == 0) {            byte[] altName = (byte[]) listitem.get(1);            DERObject oct = (DERObject) (new ASN1InputStream(new ByteArrayInputStream(altName)).readObject());            ASN1Sequence seq = ASN1Sequence.getInstance(oct);            return seq;        }        return null;    }