if (mechToken == null || mechToken.getTagClass() != BERTags.APPLICATION
                    || !(mechToken.getBaseObject() instanceof ASN1Sequence)) {
                throw new PACDecodingException("Malformed kerberos token");
            }

            this.apRequest = new KerberosApRequest((ASN1Sequence) mechToken.getBaseObject(), keys);
        } catch (IOException e) {
            throw new PACDecodingException("Malformed kerberos token", e);

            if (constructed == null || constructed.getTagClass() != BERTags.APPLICATION
                    || !(constructed.getBaseObject() instanceof ASN1Sequence)) {
                throw new IOException("Malformed SPNEGO token " + constructed);
            }

            final ASN1Sequence vec = (ASN1Sequence) constructed.getBaseObject();

            final ASN1ObjectIdentifier spnego = (ASN1ObjectIdentifier) vec.getObjectAt(0);

            assertEquals(0, top.getTagNo(), "Top-level tag number should be 0");
            assertTrue(top.getBaseObject() instanceof ASN1Sequence, "Base object should be a sequence");
            ASN1Sequence seq = (ASN1Sequence) top.getBaseObject();
            assertEquals(2, seq.size(), "Sequence should contain OID and [0] NegTokenInit");

                    throw new PACDecodingException("Malformed Kerberos Ticket");
                }
                try {
                    this.ticket = new KerberosTicket(derTicket.getBaseObject().getEncoded(), this.apOptions, keys);
                } catch (IOException e) {
                    throw new PACDecodingException("Malformed Kerberos Ticket", e);
                }
                break;

     */
    public static <T extends ASN1Primitive> T as(final Class<T> type, final ASN1TaggedObject tagged) throws PACDecodingException {
        return as(type, tagged.getBaseObject());
    }

    /**
     * Gets an element from a DLSequence at the specified index and casts it to the specified type
     * @param <T> the target ASN.1 primitive type
     * @param type the target class type

            throw new PACDecodingException("Malformed kerberos ticket", e);
        }

        ASN1Sequence sequence;
        try {
            sequence = ASN1Util.as(ASN1Sequence.class, derToken.getBaseObject());
        } catch (IOException e) {
            throw new PACDecodingException("Malformed kerberos ticket", e);
        }

        Enumeration<?> fields = sequence.getObjects();