kr_attrset_encode
kr_attrset_encode(const krad_attrset *set, const char *secret,
retval = kr_attrset_encode(set, secret, pkt_auth(pkt), msgauth_required,
retval = kr_attrset_encode(set, secret, pkt_auth(request),
noerror(kr_attrset_encode(set, "foo", auth, FALSE, buffer, &encode_len));