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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) 2001-2006 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 #define soft_limit 0x10000 | |
52 | |
53 err_status_t | |
54 key_limit_set(key_limit_t key, const xtd_seq_num_t s) { | |
55 #ifdef NO_64BIT_MATH | |
56 if (high32(s) == 0 && low32(s) < soft_limit) | |
57 return err_status_bad_param; | |
58 #else | |
59 if (s < soft_limit) | |
60 return err_status_bad_param; | |
61 #endif | |
62 key->num_left = s; | |
63 key->state = key_state_normal; | |
64 return err_status_ok; | |
65 } | |
66 | |
67 err_status_t | |
68 key_limit_clone(key_limit_t original, key_limit_t *new_key) { | |
69 if (original == NULL) | |
70 return err_status_bad_param; | |
71 *new_key = original; | |
72 return err_status_ok; | |
73 } | |
74 | |
75 err_status_t | |
76 key_limit_check(const key_limit_t key) { | |
77 if (key->state == key_state_expired) | |
78 return err_status_key_expired; | |
79 return err_status_ok; | |
80 } | |
81 | |
82 key_event_t | |
83 key_limit_update(key_limit_t key) { | |
84 #ifdef NO_64BIT_MATH | |
85 if (low32(key->num_left) == 0) | |
86 { | |
87 // carry | |
88 key->num_left = make64(high32(key->num_left)-1,low32(key->num_left) -
1); | |
89 } | |
90 else | |
91 { | |
92 // no carry | |
93 key->num_left = make64(high32(key->num_left),low32(key->num_left) - 1)
; | |
94 } | |
95 if (high32(key->num_left) != 0 || low32(key->num_left) >= soft_limit) { | |
96 return key_event_normal; /* we're above the soft limit */ | |
97 } | |
98 #else | |
99 key->num_left--; | |
100 if (key->num_left >= soft_limit) { | |
101 return key_event_normal; /* we're above the soft limit */ | |
102 } | |
103 #endif | |
104 if (key->state == key_state_normal) { | |
105 /* we just passed the soft limit, so change the state */ | |
106 key->state = key_state_past_soft_limit; | |
107 } | |
108 #ifdef NO_64BIT_MATH | |
109 if (low32(key->num_left) == 0 && high32(key->num_left == 0)) | |
110 #else | |
111 if (key->num_left < 1) | |
112 #endif | |
113 { /* we just hit the hard limit */ | |
114 key->state = key_state_expired; | |
115 return key_event_hard_limit; | |
116 } | |
117 return key_event_soft_limit; | |
118 } | |
119 | |
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