fix various issues

- Add comments for ticket test hooks
- improve code style.

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>

library/ssl_tls13_server.c

@@ -195,8 +195,9 @@ static int ssl_tls13_offered_psks_check_identity_match_ticket(
 
     if (now < session->start) {
         MBEDTLS_SSL_DEBUG_MSG(
-            3, ("Invalid ticket start time ( now=%" MBEDTLS_PRINTF_MS_TIME
+            3, ("Invalid ticket start time ( now = %" MBEDTLS_PRINTF_MS_TIME
-                ", start=%" MBEDTLS_PRINTF_MS_TIME " )", now, session->start));
+                ", start = %" MBEDTLS_PRINTF_MS_TIME " )",
+                now, session->start));
         goto exit;
     }
 
@@ -213,7 +214,7 @@ static int ssl_tls13_offered_psks_check_identity_match_ticket(
      *
      * For time being, the age MUST be less than 604800 seconds (7 days).
      */
-    if (server_age > 604800*1000) {
+    if (server_age > 604800 * 1000) {
         MBEDTLS_SSL_DEBUG_MSG(
             3, ("Ticket age exceeds limitation ticket_age=%" MBEDTLS_PRINTF_MS_TIME,
                 server_age));
@@ -238,7 +239,8 @@ static int ssl_tls13_offered_psks_check_identity_match_ticket(
     if (age_diff < -1000 ||
         age_diff > MBEDTLS_SSL_TLS1_3_TICKET_AGE_TOLERANCE) {
         MBEDTLS_SSL_DEBUG_MSG(
-            3, ("Ticket age outside tolerance window ( diff=%" MBEDTLS_PRINTF_MS_TIME ")",
+            3, ("Ticket age outside tolerance window ( diff = %"
+                MBEDTLS_PRINTF_MS_TIME ")",
                 age_diff));
         goto exit;
     }

programs/ssl/ssl_server2.c

@@ -1416,35 +1416,43 @@ int dummy_ticket_parse(void *p_ticket, mbedtls_ssl_session *session,
 
     switch (opt.dummy_ticket % 11) {
         case 1:
+            /* Callback function return INVALID_MAC */
             return MBEDTLS_ERR_SSL_INVALID_MAC;
         case 2:
+            /* Callback function return ticket expired */
             return MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
         case 3:
+            /* Built-in check, the start time is in future. */
             session->start = mbedtls_ms_time() + 10 * 1000;
             break;
         case 4:
+            /* Built-in check, ticket expired due to too old. */
             session->start = mbedtls_ms_time() - 10 * 1000 - 7 * 24 * 3600 * 1000;
             break;
         case 5:
+            /* Built-in check, age outside tolerance window, too young. */
             session->start = mbedtls_ms_time() - 10 * 1000;
             break;
+#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
         case 6:
+            /* Built-in check, age outside tolerance window, too old. */
             session->start = mbedtls_ms_time();
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
             session->ticket_age_add -= 1000;
-#endif
             break;
-#if defined(MBEDTLS_SSL_PROTO_TLS1_3)
         case 7:
+            /* Built-in check, ticket permission check. */
             session->ticket_flags = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_NONE;
             break;
         case 8:
+            /* Built-in check, ticket permission check. */
             session->ticket_flags = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK;
             break;
         case 9:
+            /* Built-in check, ticket permission check. */
             session->ticket_flags = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_EPHEMERAL;
             break;
         case 10:
+            /* Built-in check, ticket permission check. */
             session->ticket_flags = MBEDTLS_SSL_TLS1_3_KEY_EXCHANGE_MODE_PSK_ALL;
             break;
 #endif