Change HMAC signature size from 4 bytes (ZORG hack) to 10 bytes (SRTP RFC 3711 s5.2 n_tag = 80 bits).  Add some logging.
Change HMAC signature size from 4 bytes (ZORG hack) to 10 bytes (SRTP RFC 3711 s5.2 n_tag = 80 bits).  Add some logging.

mikma/zrtp,mikma/zrtp,mikma/zrtp,mikma/zrtp,mikma/zrtp