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Mark various standard library functions with the __bounded__ attribute.
You must have an up-to-date gcc for this!
deraadt@ ok

/*	$OpenBSD: sha1.h,v 1.12 2003/06/26 18:35:13 avsm Exp $	*/

/*
 * SHA-1 in C
 * By Steve Reid <steve@edmweb.com>
 * 100% Public Domain
 */

#ifndef _SHA1_H
#define _SHA1_H

typedef struct {
    u_int32_t state[5];
    u_int32_t count[2];
    u_char buffer[64];
} SHA1_CTX;

#include <sys/cdefs.h>

__BEGIN_DECLS
void SHA1Transform(u_int32_t state[5], const u_char buffer[64]);
void SHA1Init(SHA1_CTX *context);
void SHA1Update(SHA1_CTX *context, const u_char *data, u_int len);
void SHA1Final(u_char digest[20], SHA1_CTX *context);
char *SHA1End(SHA1_CTX *, char *);
char *SHA1File(char *, char *);
char *SHA1Data(const u_char *, size_t, char *)
		__attribute__((__bounded__ (__string__,3,2)));
__END_DECLS

#define SHA1_DIGESTSIZE       20
#define SHA1_BLOCKSIZE        64
#define HTONDIGEST(x) do {                                              \
        x[0] = htonl(x[0]);                                             \
        x[1] = htonl(x[1]);                                             \
        x[2] = htonl(x[2]);                                             \
        x[3] = htonl(x[3]);                                             \
        x[4] = htonl(x[4]); } while (0)

#define NTOHDIGEST(x) do {                                              \
        x[0] = ntohl(x[0]);                                             \
        x[1] = ntohl(x[1]);                                             \
        x[2] = ntohl(x[2]);                                             \
        x[3] = ntohl(x[3]);                                             \
        x[4] = ntohl(x[4]); } while (0)

#endif /* _SHA1_H */