diff --git a/library/utils.c b/library/utils.c
new file mode 100644
index 0000000..f943cb1
--- /dev/null
+++ b/library/utils.c
@@ -0,0 +1,33 @@
+/*
+ *  mbedtls utility functions
+ *
+ *  Copyright (C) 2017, ARM Limited, All Rights Reserved
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ *  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.
+ *
+ *  This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#include "mbedtls/utils.h"
+
+#include <stddef.h>
+
+/* This implementation should never be optimized out by the compiler */
+void mbedtls_zeroize( void *buf, size_t len )
+{
+    volatile unsigned char *p = (unsigned char *)buf;
+
+    while( len-- )
+        *p++ = 0;
+}