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diff --git a/apps/include/netutils/md5.h b/apps/include/netutils/md5.h
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+/****************************************************************************
+ * apps/include/netutils/md5.h
+ *
+ * This file is part of the NuttX RTOS:
+ *
+ *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
+ *   Author: Darcy Gong
+ *
+ * Reference:
+ *
+ *   This code implements the MD5 message-digest algorithm.
+ *   The algorithm is due to Ron Rivest.  This code was
+ *   written by Colin Plumb in 1993, no copyright is claimed.
+ *   This code is in the public domain; do with it what you wish.
+ *
+ *   Equivalent code is available from RSA Data Security, Inc.
+ *   This code has been tested against that, and is equivalent,
+ *   except that you don't need to include two pages of legalese
+ *   with every copy.
+ *
+ *   To compute the message digest of a chunk of bytes, declare an
+ *   MD5Context structure, pass it to MD5Init, call MD5Update as
+ *   needed on buffers full of bytes, and then call MD5Final, which
+ *   will fill a supplied 16-byte array with the digest.
+ *
+ *   See README and COPYING for more details.
+ *
+ * And is re-released under the NuttX modified BSD license:
+ *
+ *   Redistribution and use in source and binary forms, with or without
+ *   modification, are permitted provided that the following conditions
+ *   are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *   2. 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.
+ *   3. Neither the name of the Institute 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 INSTITUTE 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 INSTITUTE 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.
+ *
+ ****************************************************************************/
+
+#ifndef __APPS_INCLUDE_NETUTILS_MD5_H
+#define __APPS_INCLUDE_NETUTILS_MD5_H
+
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
+#include <nuttx/config.h>
+
+#ifdef CONFIG_CODECS_HASH_MD5
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+/****************************************************************************
+ * Public Types
+ ****************************************************************************/
+
+struct MD5Context
+{
+  uint32_t buf[4];
+  uint32_t bits[2];
+  uint8_t in[64];
+};
+
+typedef struct MD5Context MD5_CTX;
+
+/****************************************************************************
+ * Public Function Prototypes
+ ****************************************************************************/
+
+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);
+void MD5Transform(uint32_t buf[4], uint32_t const in[16]);
+
+void md5_sum(const uint8_t *addr, const size_t len, uint8_t *mac);
+char *md5_hash(const uint8_t *addr, const size_t len);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* CONFIG_CODECS_HASH_MD5 */
+#endif /* __APPS_INCLUDE_NETUTILS_MD5_H */