anass kartit wrote:
> Hi Benny,
> I have been experimenting with streamutil example with encrypting
> packets. I decrypt packets on_rx_rtp as the following but I receive
> Invalid_RTP_Version.
This means that udp->rtp_pkt does not contain a valid RTP packet.
Maybe something wrong with the encryption/decryption?
More below.
> /* Simulate packet lost on RX direction */
>
> if (udp->rx_drop_pct) {
>
> if ((pj_rand() % 100) <= (int)udp->rx_drop_pct) {
>
> PJ_LOG(5,(udp->base.name <http://base.name>,
>
> "RX RTP packet dropped because of pkt lost "
>
> "simulation"));
>
> goto read_next_packet;
>
> }
>
> }
>
> encrypt_decrypt(udp->rtp_pkt,udp->rtp_pkt,key);
This is indeed the correct place to do decryption. But I'm curious
on why do you use same function encrypt_decrypt() for both
encrypting and decrypting. I hope that's intentional.
> ......and here
>
> read_next_packet:
>
> encrypt_decrypt(udp->rtp_pkt,udp->rtp_pkt,key);
This is not necessary.
regards,
-benny
> bytes_read =
>
> sizeof(udp->rtp_pkt);
>
> udp->rtp_addrlen =
>
> sizeof(pj_sockaddr_in);
>
> and I encrypt the packets in transport_send_rtp as the following:
>
> if (udp->tx_drop_pct) {
>
> if ((pj_rand() % 100) <= (int)udp->tx_drop_pct) {
>
> PJ_LOG(5,(udp->base.name <http://base.name>,
>
> "TX RTP packet dropped because of pkt lost "
>
>
>
> "simulation"));
>
> return PJ_SUCCESS;
>
> }
>
> }
>
>
>
> id = udp->rtp_write_op_id;
>
> pw = &udp->rtp_pending_write[id];
>
> /* We need to copy packet to our buffer because when the
>
> * operation is pending, caller might write something else
>
> * to the original buffer.
>
> */
>
>
>
> ///crypto
>
>
>
> encrypt_decrypt(pkt,cryptbuf,key);
>
> ///////////
>
>
>
> pj_memcpy(pw->buffer, cryptbuf, size);
>
> sent = size;
>
>
>
> what is the problem ?
>
>
> ------------------------------------------------------------------------
>
> _______________________________________________
> Visit our blog: http://blog.pjsip.org
>
> pjsip mailing list
> pjsip at lists.pjsip.org
> http://lists.pjsip.org/mailman/listinfo/pjsip_lists.pjsip.org
--
Benny Prijono
http://www.pjsip.org
