/src/libsrtp/crypto/kernel/key.c
Line | Count | Source (jump to first uncovered line) |
1 | | /* |
2 | | * key.c |
3 | | * |
4 | | * key usage limits enforcement |
5 | | * |
6 | | * David A. Mcgrew |
7 | | * Cisco Systems, Inc. |
8 | | */ |
9 | | /* |
10 | | * |
11 | | * Copyright (c) 2001-2017 Cisco Systems, Inc. |
12 | | * All rights reserved. |
13 | | * |
14 | | * Redistribution and use in source and binary forms, with or without |
15 | | * modification, are permitted provided that the following conditions |
16 | | * are met: |
17 | | * |
18 | | * Redistributions of source code must retain the above copyright |
19 | | * notice, this list of conditions and the following disclaimer. |
20 | | * |
21 | | * Redistributions in binary form must reproduce the above |
22 | | * copyright notice, this list of conditions and the following |
23 | | * disclaimer in the documentation and/or other materials provided |
24 | | * with the distribution. |
25 | | * |
26 | | * Neither the name of the Cisco Systems, Inc. nor the names of its |
27 | | * contributors may be used to endorse or promote products derived |
28 | | * from this software without specific prior written permission. |
29 | | * |
30 | | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
31 | | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
32 | | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
33 | | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
34 | | * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
35 | | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
36 | | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
37 | | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
38 | | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
39 | | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
40 | | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
41 | | * OF THE POSSIBILITY OF SUCH DAMAGE. |
42 | | * |
43 | | */ |
44 | | |
45 | | #ifdef HAVE_CONFIG_H |
46 | | #include <config.h> |
47 | | #endif |
48 | | |
49 | | #include "key.h" |
50 | | |
51 | 162k | #define soft_limit 0x10000 |
52 | | |
53 | | srtp_err_status_t srtp_key_limit_set(srtp_key_limit_t key, |
54 | | const srtp_xtd_seq_num_t s) |
55 | 19.3k | { |
56 | 19.3k | if (s < soft_limit) { |
57 | 0 | return srtp_err_status_bad_param; |
58 | 0 | } |
59 | 19.3k | key->num_left = s; |
60 | 19.3k | key->state = srtp_key_state_normal; |
61 | 19.3k | return srtp_err_status_ok; |
62 | 19.3k | } |
63 | | |
64 | | srtp_err_status_t srtp_key_limit_clone(srtp_key_limit_t original, |
65 | | srtp_key_limit_t *new_key) |
66 | 130k | { |
67 | 130k | if (original == NULL) { |
68 | 0 | return srtp_err_status_bad_param; |
69 | 0 | } |
70 | 130k | *new_key = original; |
71 | 130k | return srtp_err_status_ok; |
72 | 130k | } |
73 | | |
74 | | srtp_key_event_t srtp_key_limit_update(srtp_key_limit_t key) |
75 | 143k | { |
76 | 143k | key->num_left--; |
77 | 143k | if (key->num_left >= soft_limit) { |
78 | 143k | return srtp_key_event_normal; /* we're above the soft limit */ |
79 | 143k | } |
80 | 0 | if (key->state == srtp_key_state_normal) { |
81 | | /* we just passed the soft limit, so change the state */ |
82 | 0 | key->state = srtp_key_state_past_soft_limit; |
83 | 0 | } |
84 | 0 | if (key->num_left < 1) { |
85 | | /* we just hit the hard limit */ |
86 | 0 | key->state = srtp_key_state_expired; |
87 | 0 | return srtp_key_event_hard_limit; |
88 | 0 | } |
89 | 0 | return srtp_key_event_soft_limit; |
90 | 0 | } |