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Add Pad and FileChunk functions for each family of hash functions.
The Pad function does padding like in Final but does not finish processing.
The FileChunk function creates a digest from a portion of a file.
Also made the length parameters consistent (and size_t).

/*	$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_

#define	MD5_BLOCK_LENGTH		64
#define	MD5_DIGEST_LENGTH		16
#define	MD5_DIGEST_STRING_LENGTH	(MD5_DIGEST_LENGTH * 2 + 1)

typedef struct MD5Context {
	u_int32_t state[4];			/* state */
	u_int64_t count;			/* number of bits, mod 2^64 */
	u_int8_t buffer[MD5_BLOCK_LENGTH];	/* input buffer */
} MD5_CTX;

#include <sys/cdefs.h>

__BEGIN_DECLS
void	 MD5Init(MD5_CTX *);
void	 MD5Update(MD5_CTX *, const u_int8_t *, size_t)
		__attribute__((__bounded__(__string__,2,3)));
void	 MD5Pad(MD5_CTX *);
void	 MD5Final(u_int8_t [MD5_DIGEST_LENGTH], MD5_CTX *)
		__attribute__((__bounded__(__minbytes__,1,MD5_DIGEST_LENGTH)));
void	 MD5Transform(u_int32_t [4], const u_int8_t [MD5_BLOCK_LENGTH])
		__attribute__((__bounded__(__minbytes__,1,4)))
		__attribute__((__bounded__(__minbytes__,2,MD5_BLOCK_LENGTH)));
char	*MD5End(MD5_CTX *, char *)
		__attribute__((__bounded__(__minbytes__,2,MD5_DIGEST_STRING_LENGTH)));
char	*MD5File(char *, char *)
		__attribute__((__bounded__(__minbytes__,2,MD5_DIGEST_STRING_LENGTH)));
char	*MD5FileChunk(char *, char *, off_t, off_t)
		__attribute__((__bounded__(__minbytes__,2,MD5_DIGEST_STRING_LENGTH)));
char	*MD5Data(const u_int8_t *, size_t, char *)
		__attribute__((__bounded__(__string__,1,2)))
		__attribute__((__bounded__(__minbytes__,3,MD5_DIGEST_STRING_LENGTH)));
__END_DECLS

#endif /* _MD5_H_ */