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diff --git a/lib/libskey/md4.h b/lib/libskey/md4.h
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+++ b/lib/libskey/md4.h
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+#ifdef	__STDC__
+#define	__ARGS(X) X	/* For ANSI C */
+#else
+#define	__ARGS(X) ()
+#endif
+
+/* 
+ *
+ * md4.h -- Header file for implementation of MD4 Message Digest Algorithm
+ * Updated: 2/13/90 by Ronald L. Rivest
+ * (C) 1990 RSA Data Security, Inc.
+ * Reformatted and de-linted - 2/12/91 Phil Karn
+ */
+
+/* MDstruct is the data structure for a message digest computation. */
+typedef struct {
+	unsigned long buffer[4];/* Holds 4-word result of MD computation */
+	unsigned char count[8];	/* Number of bits processed so far */
+	unsigned int done;	/* Nonzero means MD computation finished */
+} MDstruct, *MDptr;
+
+/* MDbegin(MD)
+ * Input: MD -- an MDptr
+ * Initialize the MDstruct prepatory to doing a message digest computation.
+ */
+extern void MDbegin __ARGS((MDptr MDp));
+
+/* MDupdate(MD,X,count)
+ * Input: MD -- an MDptr
+ *        X -- a pointer to an array of unsigned characters.
+ *        count -- the number of bits of X to use (an unsigned int).
+ * Updates MD using the first ``count'' bits of X.
+ * The array pointed to by X is not modified.
+ * If count is not a multiple of 8, MDupdate uses high bits of last byte.
+ * This is the basic input routine for a user.
+ * The routine terminates the MD computation when count < 512, so
+ * every MD computation should end with one call to MDupdate with a
+ * count less than 512.  Zero is OK for a count.
+ */
+extern void MDupdate __ARGS((MDptr MDp,unsigned char *X,unsigned int count));
+
+/* MDprint(MD)
+ * Input: MD -- an MDptr
+ * Prints message digest buffer MD as 32 hexadecimal digits.
+ * Order is from low-order byte of buffer[0] to high-order byte of buffer[3].
+ * Each byte is printed with high-order hexadecimal digit first.
+ */
+extern void MDprint __ARGS((MDptr MDp));
+
+/* End of md4.h */