Provide CBS_get_u64().

This will be used in the libcrypto certificate transparency code.

ok tb@

1 files changed, 18 insertions, 1 deletions

diff --git a/src/lib/libssl/bs_cbs.c b/src/lib/libssl/bs_cbs.c
index 627c609bb9..97b0163f3f 100644
--- a/src/lib/libssl/bs_cbs.c
+++ b/src/lib/libssl/bs_cbs.c
@@ -1,4 +1,4 @@
-/*      $OpenBSD: bs_cbs.c,v 1.22 2021/12/15 17:23:34 jsing Exp $       */
+/*      $OpenBSD: bs_cbs.c,v 1.23 2021/12/15 17:30:20 jsing Exp $       */
 /*
  * Copyright (c) 2014, Google Inc.
  *
@@ -191,6 +191,23 @@ CBS_get_u32(CBS *cbs, uint32_t *out)
 }
 
 int
+CBS_get_u64(CBS *cbs, uint64_t *out)
+{
+        uint32_t a, b;
+
+        if (cbs->len < 8)
+                return 0;
+
+        if (!CBS_get_u32(cbs, &a))
+                return 0;
+        if (!CBS_get_u32(cbs, &b))
+                return 0;
+
+        *out = (uint64_t)a << 32 | b;
+        return 1;
+}
+
+int
 CBS_get_last_u8(CBS *cbs, uint8_t *out)
 {
         if (cbs->len == 0)