diff --git a/extensions/app_radgw/md5.h b/extensions/app_radgw/md5.h
new file mode 100644
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--- /dev/null
+++ b/extensions/app_radgw/md5.h
@@ -0,0 +1,46 @@
+/*********************************************************************************/
+/* freeDiameter author note:
+ *  The content from this file comes directly from the hostap project.
+ * It is redistributed under the terms of the BSD license, as allowed
+ * by the original copyright reproduced below.
+ */
+
+/*********************************************************************************/
+
+/*
+ * MD5 hash implementation and interface functions
+ * Copyright (c) 2003-2005, Jouni Malinen <j@w1.fi>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Alternatively, this software may be distributed under the terms of BSD
+ * license.
+ *
+ * See README and COPYING for more details.
+ */
+
+#ifndef MD5_H
+#define MD5_H
+
+#define MD5_MAC_LEN 16
+
+void hmac_md5_vector(const u8 *key, size_t key_len, size_t num_elem,
+		     const u8 *addr[], const size_t *len, u8 *mac);
+void hmac_md5(const u8 *key, size_t key_len, const u8 *data, size_t data_len,
+	      u8 *mac);
+
+#ifdef CONFIG_CRYPTO_INTERNAL
+struct MD5Context;
+
+void MD5Init(struct MD5Context *context);
+void MD5Update(struct MD5Context *context, unsigned char const *buf,
+	       unsigned len);
+void MD5Final(unsigned char digest[16], struct MD5Context *context);
+#endif /* CONFIG_CRYPTO_INTERNAL */
+
+ /* Forward declaration: */
+void md5_vector(size_t num_elem, const u8 *addr[], const size_t *len, u8 *mac);
+
+#endif /* MD5_H */