C binding for olm::unset

include/olm/memory.h

@@ -0,0 +1,41 @@
+/* Copyright 2015, 2016 OpenMarket Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* C bindings for memory functions */
+
+
+#ifndef OLM_MEMORY_H_
+#define OLM_MEMORY_H_
+
+#include <stddef.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * Clear the memory held in the buffer. This is more resilient to being
+ * optimised away than memset or bzero.
+ */
+void _olm_unset(
+    void volatile * buffer, size_t buffer_length
+);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+
+#endif /* OLM_MEMORY_H_ */

src/memory.cpp

@@ -13,7 +13,13 @@
  * limitations under the License.
  */
 #include "olm/memory.hh"
+#include "olm/memory.h"
 
+void _olm_unset(
+    void volatile * buffer, size_t buffer_length
+) {
+    olm::unset(buffer, buffer_length);
+}
 
 void olm::unset(
     void volatile * buffer, std::size_t buffer_length