diff --git a/drivers/auth/mbedtls/mbedtls_common.c b/drivers/auth/mbedtls/mbedtls_common.c
new file mode 100644
index 0000000..2978260
--- /dev/null
+++ b/drivers/auth/mbedtls/mbedtls_common.c
@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+
+/* mbedTLS headers */
+#include <polarssl/memory_buffer_alloc.h>
+
+/*
+ * mbedTLS heap
+ */
+#if (MBEDTLS_KEY_ALG_ID == MBEDTLS_ECDSA)
+#define MBEDTLS_HEAP_SIZE		(14*1024)
+#elif (MBEDTLS_KEY_ALG_ID == MBEDTLS_RSA)
+#define MBEDTLS_HEAP_SIZE		(8*1024)
+#endif
+static unsigned char heap[MBEDTLS_HEAP_SIZE];
+
+/*
+ * mbedTLS initialization function
+ *
+ * Return: 0 = success, Otherwise = error
+ */
+void mbedtls_init(void)
+{
+	static int ready;
+	int rc;
+
+	if (!ready) {
+		/* Initialize the mbedTLS heap */
+		rc = memory_buffer_alloc_init(heap, MBEDTLS_HEAP_SIZE);
+		if (rc == 0) {
+			ready = 1;
+		} else {
+			assert(0);
+		}
+	}
+}