1/*	$FreeBSD: src/sys/netinet6/ah.h,v 1.3.2.2 2001/07/03 11:01:49 ume Exp $	*/
2/*	$KAME: ah.h,v 1.13 2000/10/18 21:28:00 itojun Exp $	*/
3
4/*
5 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the project nor the names of its contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33/*
34 * RFC1826/2402 authentication header.
35 */
36
37#ifndef _NETINET6_AH_H_
38#define _NETINET6_AH_H_
39#include <sys/appleapiopts.h>
40
41struct ah {
42	u_int8_t	ah_nxt;		/* Next Header */
43	u_int8_t	ah_len;		/* Length of data, in 32bit */
44	u_int16_t	ah_reserve;	/* Reserved for future use */
45	u_int32_t	ah_spi;		/* Security parameter index */
46	/* variable size, 32bit bound*/	/* Authentication data */
47};
48
49struct newah {
50	u_int8_t	ah_nxt;		/* Next Header */
51	u_int8_t	ah_len;		/* Length of data + 1, in 32bit */
52	u_int16_t	ah_reserve;	/* Reserved for future use */
53	u_int32_t	ah_spi;		/* Security parameter index */
54	u_int32_t	ah_seq;		/* Sequence number field */
55	/* variable size, 32bit bound*/	/* Authentication data */
56};
57
58#ifdef BSD_KERNEL_PRIVATE
59struct secasvar;
60
61struct ah_algorithm_state {
62	struct secasvar *sav;
63	void* foo;	/*per algorithm data - maybe*/
64};
65
66struct ah_algorithm {
67	int (*sumsiz)(struct secasvar *);
68	int (*mature)(struct secasvar *);
69	int keymin;	/* in bits */
70	int keymax;	/* in bits */
71	const char *name;
72	int (*init)(struct ah_algorithm_state *, struct secasvar *);
73	void (*update)(struct ah_algorithm_state *, caddr_t, size_t);
74	void (*result)(struct ah_algorithm_state *, caddr_t, size_t);
75};
76
77#define	AH_MAXSUMSIZE	64 // sha2-512's output size
78
79extern const struct ah_algorithm *ah_algorithm_lookup(int);
80
81/* cksum routines */
82extern int ah_hdrlen(struct secasvar *);
83
84extern size_t ah_hdrsiz(struct ipsecrequest *);
85extern void ah4_input(struct mbuf *, int);
86extern int ah4_output(struct mbuf *, struct secasvar *);
87extern int ah4_calccksum(struct mbuf *, caddr_t, size_t,
88	const struct ah_algorithm *, struct secasvar *);
89#endif /* BSD_KERNEL_PRIVATE */
90
91#endif /* _NETINET6_AH_H_ */
92