Merge 'iotssl-1099-incorrect-renego-dtls'

Fix an incorrect condition in ssl_check_ctr_renegotiate() that compared
64 bits of record counter instead of 48 bits as described in RFC 6347
Section 4.3.1. This would cause the function's return value to be
occasionally incorrect and the renegotiation routines to be triggered
at unexpected times.

tests/ssl-opt.sh

@@ -1601,6 +1601,19 @@ run_test    "Renegotiation: DTLS, server-initiated" \
             -s "=> renegotiate" \
             -s "write hello request"
 
+run_test    "Renegotiation: DTLS, renego_period overflow" \
+            "$P_SRV debug_level=3 dtls=1 exchanges=4 renegotiation=1 renego_period=18446462598732840962 auth_mode=optional" \
+            "$P_CLI debug_level=3 dtls=1 exchanges=4 renegotiation=1" \
+            0 \
+            -c "client hello, adding renegotiation extension" \
+            -s "received TLS_EMPTY_RENEGOTIATION_INFO" \
+            -s "found renegotiation extension" \
+            -s "server hello, secure renegotiation extension" \
+            -s "record counter limit reached: renegotiate" \
+            -c "=> renegotiate" \
+            -s "=> renegotiate" \
+            -s "write hello request" \
+
 requires_gnutls
 run_test    "Renegotiation: DTLS, gnutls server, client-initiated" \
             "$G_SRV -u --mtu 4096" \