1 files changed, 8 insertions, 1 deletions

diff --git a/src/lib/libssl/bs_cbs.c b/src/lib/libssl/bs_cbs.c
index 1b513c9a0e..1368fe0fd7 100644
--- a/src/lib/libssl/bs_cbs.c
+++ b/src/lib/libssl/bs_cbs.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bs_cbs.c,v 1.10 2015/06/16 06:11:39 doug Exp $        */
+/*      $OpenBSD: bs_cbs.c,v 1.11 2015/06/17 07:00:22 doug Exp $        */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -28,6 +28,7 @@ void
 CBS_init(CBS *cbs, const uint8_t *data, size_t len)
 {
         cbs->data = data;
+        cbs->initial_len = len;
         cbs->len = len;
 }
 
@@ -43,6 +44,12 @@ cbs_get(CBS *cbs, const uint8_t **p, size_t n)
         return 1;
 }
 
+size_t
+CBS_offset(const CBS *cbs)
+{
+        return cbs->initial_len - cbs->len;
+}
+
 int
 CBS_skip(CBS *cbs, size_t len)
 {