The Tor Browser / file comparison
comparison: netwerk/srtp/src/crypto/kernel/key.c
netwerk/srtp/src/crypto/kernel/key.c
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
equal
deleted
inserted
replaced
| -1:000000000000 | 0:11837f886a46 |
|---|---|
| 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 #include "key.h" | |
| 46 | |
| 47 #define soft_limit 0x10000 | |
| 48 | |
| 49 err_status_t | |
| 50 key_limit_set(key_limit_t key, const xtd_seq_num_t s) { | |
| 51 #ifdef NO_64BIT_MATH | |
| 52 if (high32(s) == 0 && low32(s) < soft_limit) | |
| 53 return err_status_bad_param; | |
| 54 #else | |
| 55 if (s < soft_limit) | |
| 56 return err_status_bad_param; | |
| 57 #endif | |
| 58 key->num_left = s; | |
| 59 key->state = key_state_normal; | |
| 60 return err_status_ok; | |
| 61 } | |
| 62 | |
| 63 err_status_t | |
| 64 key_limit_clone(key_limit_t original, key_limit_t *new_key) { | |
| 65 if (original == NULL) | |
| 66 return err_status_bad_param; | |
| 67 *new_key = original; | |
| 68 return err_status_ok; | |
| 69 } | |
| 70 | |
| 71 err_status_t | |
| 72 key_limit_check(const key_limit_t key) { | |
| 73 if (key->state == key_state_expired) | |
| 74 return err_status_key_expired; | |
| 75 return err_status_ok; | |
| 76 } | |
| 77 | |
| 78 key_event_t | |
| 79 key_limit_update(key_limit_t key) { | |
| 80 #ifdef NO_64BIT_MATH | |
| 81 if (low32(key->num_left) == 0) | |
| 82 { | |
| 83 // carry | |
| 84 key->num_left = make64(high32(key->num_left)-1,low32(key->num_left) - 1); | |
| 85 } | |
| 86 else | |
| 87 { | |
| 88 // no carry | |
| 89 key->num_left = make64(high32(key->num_left),low32(key->num_left) - 1); | |
| 90 } | |
| 91 if (high32(key->num_left) != 0 || low32(key->num_left) >= soft_limit) { | |
| 92 return key_event_normal; /* we're above the soft limit */ | |
| 93 } | |
| 94 #else | |
| 95 key->num_left--; | |
| 96 if (key->num_left >= soft_limit) { | |
| 97 return key_event_normal; /* we're above the soft limit */ | |
| 98 } | |
| 99 #endif | |
| 100 if (key->state == key_state_normal) { | |
| 101 /* we just passed the soft limit, so change the state */ | |
| 102 key->state = key_state_past_soft_limit; | |
| 103 } | |
| 104 #ifdef NO_64BIT_MATH | |
| 105 if (low32(key->num_left) == 0 && high32(key->num_left == 0)) | |
| 106 #else | |
| 107 if (key->num_left < 1) | |
| 108 #endif | |
| 109 { /* we just hit the hard limit */ | |
| 110 key->state = key_state_expired; | |
| 111 return key_event_hard_limit; | |
| 112 } | |
| 113 return key_event_soft_limit; | |
| 114 } | |
| 115 |
