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diff --git a/lib/compat/md5.h b/lib/compat/md5.h
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+++ b/lib/compat/md5.h
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+/*	$OpenBSD: md5.h,v 1.15 2004/05/03 17:30:14 millert Exp $	*/
+
+/*
+ * 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.
+ */
+
+#ifndef _MD5_H_
+#define _MD5_H_
+
+#include <stdint.h>
+
+#define	MD5_BLOCK_LENGTH		64
+#define	MD5_DIGEST_LENGTH		16
+#define	MD5_DIGEST_STRING_LENGTH	(MD5_DIGEST_LENGTH * 2 + 1)
+
+typedef struct MD5Context {
+	uint32_t state[4];			/* state */
+	uint64_t count;			/* number of bits, mod 2^64 */
+	uint8_t buffer[MD5_BLOCK_LENGTH];	/* input buffer */
+} MD5_CTX;
+
+void	 MD5Init(MD5_CTX *);
+void	 MD5Update(MD5_CTX *, const uint8_t *, size_t);
+void	 MD5Pad(MD5_CTX *);
+void	 MD5Final(uint8_t [MD5_DIGEST_LENGTH], MD5_CTX *);
+void	 MD5Transform(uint32_t [4], const uint8_t [MD5_BLOCK_LENGTH]);
+
+#endif /* _MD5_H_ */