Add handshake wrapup

Signed-off-by: Jerry Yu <jerry.h.yu@arm.com>
diff --git a/library/ssl_tls13_server.c b/library/ssl_tls13_server.c
index df3221d..d78af33 100644
--- a/library/ssl_tls13_server.c
+++ b/library/ssl_tls13_server.c
@@ -1504,7 +1504,7 @@
     if( ret != 0 )
         return( ret );
 
-    mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_FLUSH_BUFFERS );
+    mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_WRAPUP );
     return( 0 );
 
 }
@@ -1523,8 +1523,14 @@
  */
 int ssl_tls13_handshake_wrapup( mbedtls_ssl_context *ssl )
 {
-    ((void) ssl);
-    return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
+    MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
+
+    MBEDTLS_SSL_DEBUG_MSG( 1, ( "Switch to application keys for all traffic" ) );
+    mbedtls_ssl_set_inbound_transform ( ssl, ssl->transform_application );
+    mbedtls_ssl_set_outbound_transform( ssl, ssl->transform_application );
+    mbedtls_ssl_tls13_handshake_wrapup( ssl );
+    mbedtls_ssl_handshake_set_state( ssl, MBEDTLS_SSL_HANDSHAKE_OVER );
+    return( 0 );
 }
 
 /*