Prepare to provide OBJ_length() and OBJ_get0_data()

OBJ_length() turns the int obj->length into a size_t, so add
an overflow check. While obj->length should never be negative,
who knows...

ok jsing

1 files changed, 22 insertions, 1 deletions

diff --git a/src/lib/libcrypto/objects/obj_dat.c b/src/lib/libcrypto/objects/obj_dat.c
index bcbc8cef85..4f7396f669 100644
--- a/src/lib/libcrypto/objects/obj_dat.c
+++ b/src/lib/libcrypto/objects/obj_dat.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: obj_dat.c,v 1.44 2022/01/07 11:13:54 tb Exp $ */
+/* $OpenBSD: obj_dat.c,v 1.45 2022/01/08 21:36:39 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -816,3 +816,24 @@ OBJ_create(const char *oid, const char *sn, const char *ln)
         free(buf);
         return (ok);
 }
+
+size_t
+OBJ_length(const ASN1_OBJECT *obj)
+{
+        if (obj == NULL)
+                return 0;
+
+        if (obj->length < 0)
+                return 0;
+
+        return obj->length;
+}
+
+const unsigned char *
+OBJ_get0_data(const ASN1_OBJECT *obj)
+{
+        if (obj == NULL)
+                return NULL;
+
+        return obj->data;
+}