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


                ASN1ObjectIdentifier spnego = (ASN1ObjectIdentifier) vec.getObjectAt(0);
                if ( !SPNEGO_OID.equals(spnego) ) {
                    throw new IOException("Malformed SPNEGO token, OID " + spnego);
                }
                ASN1TaggedObject tagged = (ASN1TaggedObject) vec.getObjectAt(1);