/*	$FreeBSD$	*/
/*	$KAME: sha1.h,v 1.5 2000/03/27 04:36:23 sumikawa Exp $	*/

/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*
 * FIPS pub 180-1: Secure Hash Algorithm (SHA-1)
 * based on: http://csrc.nist.gov/fips/fip180-1.txt
 * implemented by Jun-ichiro itojun Itoh <itojun@itojun.org>
 */

#ifndef _CRYPTO_SHA1_H_
#define _CRYPTO_SHA1_H_


#ifndef __GNUC_PREREQ__
/* borrowed from FreeBSD sys/cdefs.h */
/*
 * Macro to test if we're using a specific version of gcc or later.
 */
#if defined(__GNUC__) && !defined(__INTEL_COMPILER)
#define	__GNUC_PREREQ__(ma, mi)	\
	(__GNUC__ > (ma) || __GNUC__ == (ma) && __GNUC_MINOR__ >= (mi))
#else
#define	__GNUC_PREREQ__(ma, mi)	0
#endif
#endif

#ifndef __min_size
/* borrowed from FreeBSD sys/cdefs.h */
/*
 * C99 Static array indices in function parameter declarations.  Syntax such as:
 * void bar(int myArray[static 10]);
 * is allowed in C99 but not in C++.  Define __min_size appropriately so
 * headers using it can be compiled in either language.  Use like this:
 * void bar(int myArray[__min_size(10)]);
 */
#if !defined(__cplusplus) && \
    (defined(__clang__) || __GNUC_PREREQ__(4, 6)) && \
    (!defined(__STDC_VERSION__) || (__STDC_VERSION__ >= 199901))
#define __min_size(x)	static (x)
#else
#define __min_size(x)	(x)
#endif
#endif /* __min_size */

struct sha1_ctxt {
	union {
		u_int8_t	b8[20];
		u_int32_t	b32[5];
	} h;
	union {
		u_int8_t	b8[8];
		u_int64_t	b64[1];
	} c;
	union {
		u_int8_t	b8[64];
		u_int32_t	b32[16];
	} m;
	u_int8_t	count;
};
typedef struct sha1_ctxt SHA1_CTX;

#define	SHA1_RESULTLEN	(160/8)

extern void sha1_init(struct sha1_ctxt *);
extern void sha1_pad(struct sha1_ctxt *);
extern void sha1_loop(struct sha1_ctxt *, const u_int8_t *, size_t);
extern void sha1_result(struct sha1_ctxt *, char[__min_size(SHA1_RESULTLEN)]);

/* compatibilty with other SHA1 source codes */
#define SHA1Init(x)		sha1_init((x))
#define SHA1Update(x, y, z)	sha1_loop((x), (y), (z))
#define SHA1Final(x, y)		sha1_result((y), (x))

#endif /*_CRYPTO_SHA1_H_*/
