tls_make_aad
tls_make_aad(aad, len - cipher_desc->tag, (char *)&rcd_sn, buf[0], prot);
tls_make_aad(dctx->aad, rxm->full_len - prot->overhead_size +
tls_make_aad(rec->aad_space, msg_pl->sg.size + prot->tail_size,