diff --git a/lib/md5.h b/lib/md5.h
new file mode 100644
index 0000000..d899fbd
--- /dev/null
+++ b/lib/md5.h
@@ -0,0 +1,85 @@
+/* $USAGI: md5.h,v 1.2 2000/11/02 11:59:25 yoshfuji Exp $ */
+/*	$KAME: md5.h,v 1.4 2000/03/27 04:36:22 sumikawa Exp $	*/
+/*	$Id: md5.h,v 1.1 2005/09/28 15:47:44 vincent Exp $ */
+
+/*
+ * Copyright (C) 2004 6WIND
+ *                          <Vincent.Jardin@6WIND.com>
+ * All rights reserved.
+ *
+ * This MD5 code is Big endian and Little Endian compatible.
+ */
+
+/*
+ * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
+ * All rights reserved.
+ *
+ * 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 project 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 PROJECT 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 PROJECT 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 _LIBZEBRA_MD5_H_
+#define _LIBZEBRA_MD5_H_
+
+#define MD5_BUFLEN	64
+
+typedef struct {
+	union {
+		u_int32_t	md5_state32[4];
+		u_int8_t	md5_state8[16];
+	} md5_st;
+
+#define md5_sta		md5_st.md5_state32[0]
+#define md5_stb		md5_st.md5_state32[1]
+#define md5_stc		md5_st.md5_state32[2]
+#define md5_std		md5_st.md5_state32[3]
+#define md5_st8		md5_st.md5_state8
+
+	union {
+		u_int64_t	md5_count64;
+		u_int8_t	md5_count8[8];
+	} md5_count;
+#define md5_n	md5_count.md5_count64
+#define md5_n8	md5_count.md5_count8
+
+	u_int	md5_i;
+	u_int8_t	md5_buf[MD5_BUFLEN];
+} md5_ctxt;
+
+extern void md5_init __P((md5_ctxt *));
+extern void md5_loop __P((md5_ctxt *, u_int8_t *, u_int));
+extern void md5_pad __P((md5_ctxt *));
+extern void md5_result __P((u_int8_t *, md5_ctxt *));
+
+/* compatibility */
+#define MD5_CTX		md5_ctxt
+#define MD5Init(x)	md5_init((x))
+#define MD5Update(x, y, z)	md5_loop((x), (y), (z))
+#define MD5Final(x, y) \
+do {				\
+	md5_pad((y));		\
+	md5_result((x), (y));	\
+} while (0)
+
+#endif /* ! _LIBZEBRA_MD5_H_*/