* @throws PACDecodingException if decoding fails
     */
    public KerberosEncData(byte[] token, Map<Integer, KerberosKey> keys) throws PACDecodingException {
        ASN1InputStream stream = new ASN1InputStream(new ByteArrayInputStream(token));
        ASN1TaggedObject derToken;
        try {
            derToken = ASN1Util.as(ASN1TaggedObject.class, stream);

            throw new IllegalStateException(ex.getMessage());
        }
    }

    @Override
    protected void parse(final byte[] token) throws IOException {

        try (ASN1InputStream is = new ASN1InputStream(token)) {
            final ASN1TaggedObject constructed = (ASN1TaggedObject) is.readObject();
            if (constructed == null || constructed.getTagClass() != BERTags.APPLICATION

                new NegTokenInit(new ASN1ObjectIdentifier[] { OID_KRB }, NegTokenInit.INTEGRITY, new byte[] { 0x01 }, new byte[] { 0x02 });

        byte[] der = init.toByteArray();

        try (ASN1InputStream is = new ASN1InputStream(der)) {
            Object obj = is.readObject();
            assertTrue(obj instanceof ASN1TaggedObject, "Top-level should be tagged (APPLICATION)");
            ASN1TaggedObject top = (ASN1TaggedObject) obj;