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diff --git a/libtac/lib/md5.h b/libtac/lib/md5.h
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+/* md5.h - header file for implementation of MD5
+ * 
+ * Copyright (C) 1990, RSA Data Security, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program - see the file COPYING.
+ *
+ * See `CHANGES' file for revision history.
+ */
+
+#ifndef __MD5_INCLUDE__
+
+/* typedef a 32-bit type */
+typedef unsigned int UINT4;
+
+/* Data structure for MD5 (Message-Digest) computation */
+typedef struct {
+  UINT4 i[2];                   /* number of _bits_ handled mod 2^64 */
+  UINT4 buf[4];                                    /* scratch buffer */
+  unsigned char in[64];                              /* input buffer */
+  unsigned char digest[16];     /* actual digest after MD5Final call */
+} MD5_CTX;
+
+void MD5Init ();
+void MD5Update ();
+void MD5Final ();
+
+#define MD5_LEN 16
+
+#define __MD5_INCLUDE__
+#endif /* __MD5_INCLUDE__ */