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
41#include <sys/types.h>
42
43#ifdef BSD_KERNEL_PRIVATE
44#include <corecrypto/cchmac.h>
45#include <corecrypto/ccsha2.h>
46#include <libkern/crypto/md5.h>
47#include <libkern/crypto/sha1.h>
48#endif /* BSD_KERNEL_PRIVATE */
49
50struct ah {
51 u_int8_t ah_nxt; /* Next Header */
52 u_int8_t ah_len; /* Length of data, in 32bit */
53 u_int16_t ah_reserve; /* Reserved for future use */
54 u_int32_t ah_spi; /* Security parameter index */
55 /* variable size, 32bit bound*/ /* Authentication data */
56};
57
58struct newah {
59 u_int8_t ah_nxt; /* Next Header */
60 u_int8_t ah_len; /* Length of data + 1, in 32bit */
61 u_int16_t ah_reserve; /* Reserved for future use */
62 u_int32_t ah_spi; /* Security parameter index */
63 u_int32_t ah_seq; /* Sequence number field */
64 /* variable size, 32bit bound*/ /* Authentication data */
65};
66
67#ifdef BSD_KERNEL_PRIVATE
68struct secasvar;
69
70struct ah_algorithm_state {
71 union {
72 struct secasvar *sav;
73 const struct ccdigest_info *digest;
74 };
75 union {
76 MD5_CTX md5_ctx;
77 SHA1_CTX sha1_ctx;
78 cchmac_ctx_decl(CCSHA512_STATE_SIZE, CCSHA512_BLOCK_SIZE, hmac_ctx);
79 };
80};
81
82
83struct ah_algorithm {
84 int (*sumsiz)(struct secasvar *);
85 int (*mature)(struct secasvar *);
86 u_int16_t keymin; /* in bits */
87 u_int16_t keymax; /* in bits */
88 const char *name;
89 int (*init)(struct ah_algorithm_state *, struct secasvar *);
90 void (*update)(struct ah_algorithm_state *, caddr_t, size_t);
91 void (*result)(struct ah_algorithm_state *, caddr_t, size_t);
92 /* not supposed to be called directly */
93 const struct ccdigest_info *(*digest)(void);
94 size_t (*schedlen)(const struct ah_algorithm *);
95 int (*schedule)(const struct ah_algorithm *, struct secasvar *);
96};
97
98#define AH_MAXSUMSIZE 64 // sha2-512's output size
99
100extern const struct ah_algorithm *ah_algorithm_lookup(int);
101
102/* cksum routines */
103extern size_t ah_hdrlen(struct secasvar *);
104extern size_t ah_hdrsiz(struct ipsecrequest *);
105extern int ah_schedule(const struct ah_algorithm *, struct secasvar *);
106
107extern void ah4_input(struct mbuf *, int);
108extern int ah4_output(struct mbuf *, struct secasvar *);
109extern int ah4_calccksum(struct mbuf *, caddr_t, size_t,
110 const struct ah_algorithm *, struct secasvar *);
111#endif /* BSD_KERNEL_PRIVATE */
112
113#endif /* _NETINET6_AH_H_ */
114