1/*
2 * hmac.h
3 *
4 * interface to hmac auth_type_t
5 *
6 * David A. McGrew
7 * Cisco Systems, Inc.
8 *
9 */
10/*
11 *
12 * Copyright (c) 2001-2006, Cisco Systems, Inc.
13 * All rights reserved.
14 *
15 * Redistribution and use in source and binary forms, with or without
16 * modification, are permitted provided that the following conditions
17 * are met:
18 *
19 *   Redistributions of source code must retain the above copyright
20 *   notice, this list of conditions and the following disclaimer.
21 *
22 *   Redistributions in binary form must reproduce the above
23 *   copyright notice, this list of conditions and the following
24 *   disclaimer in the documentation and/or other materials provided
25 *   with the distribution.
26 *
27 *   Neither the name of the Cisco Systems, Inc. nor the names of its
28 *   contributors may be used to endorse or promote products derived
29 *   from this software without specific prior written permission.
30 *
31 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
32 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
33 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
34 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
35 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
36 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
37 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
38 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
40 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
41 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
42 * OF THE POSSIBILITY OF SUCH DAMAGE.
43 *
44 */
45
46#ifndef HMAC_H
47#define HMAC_H
48
49#include "auth.h"
50#include "sha1.h"
51
52typedef struct {
53  uint8_t    opad[64];
54  sha1_ctx_t ctx;
55  sha1_ctx_t init_ctx;
56} hmac_ctx_t;
57
58err_status_t
59hmac_alloc(auth_t **a, int key_len, int out_len);
60
61err_status_t
62hmac_dealloc(auth_t *a);
63
64err_status_t
65hmac_init(hmac_ctx_t *state, const uint8_t *key, int key_len);
66
67err_status_t
68hmac_start(hmac_ctx_t *state);
69
70err_status_t
71hmac_update(hmac_ctx_t *state, const uint8_t *message, int msg_octets);
72
73err_status_t
74hmac_compute(hmac_ctx_t *state, const void *message,
75	     int msg_octets, int tag_len, uint8_t *result);
76
77
78#endif /* HMAC_H */
79