| /* |
| * replay-database.h |
| * |
| * interface for a replay database for packet security |
| * |
| * David A. McGrew |
| * Cisco Systems, Inc. |
| */ |
| |
| /* |
| * |
| * Copyright (c) 2001-2017, Cisco Systems, Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials provided |
| * with the distribution. |
| * |
| * Neither the name of the Cisco Systems, Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
| * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| * OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| #ifndef REPLAY_DB_H |
| #define REPLAY_DB_H |
| |
| #include "integers.h" /* for uint32_t */ |
| #include "datatypes.h" /* for v128_t */ |
| #include "err.h" /* for srtp_err_status_t */ |
| |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| /* |
| * if the ith least significant bit is one, then the packet index |
| * window_end-i is in the database |
| */ |
| |
| typedef struct { |
| uint32_t window_start; /* packet index of the first bit in bitmask */ |
| v128_t bitmask; |
| } srtp_rdb_t; |
| |
| #define rdb_bits_in_bitmask (8 * sizeof(v128_t)) |
| |
| /* |
| * srtp_rdb_init |
| * |
| * initalizes rdb |
| * |
| * returns srtp_err_status_ok on success, srtp_err_status_t_fail otherwise |
| */ |
| srtp_err_status_t srtp_rdb_init(srtp_rdb_t *rdb); |
| |
| /* |
| * srtp_rdb_check |
| * |
| * checks to see if index appears in rdb |
| * |
| * returns srtp_err_status_fail if the index already appears in rdb, |
| * returns srtp_err_status_ok otherwise |
| */ |
| srtp_err_status_t srtp_rdb_check(const srtp_rdb_t *rdb, uint32_t rdb_index); |
| |
| /* |
| * srtp_rdb_add_index |
| * |
| * adds index to srtp_rdb_t (and does *not* check if index appears in db) |
| * |
| * returns srtp_err_status_ok on success, srtp_err_status_fail otherwise |
| * |
| */ |
| srtp_err_status_t srtp_rdb_add_index(srtp_rdb_t *rdb, uint32_t rdb_index); |
| |
| /* |
| * the functions srtp_rdb_increment() and srtp_rdb_get_value() are for use by |
| * senders, not receivers - DO NOT use these functions on the same |
| * srtp_rdb_t upon which srtp_rdb_add_index is used! |
| */ |
| |
| /* |
| * srtp_rdb_increment(db) increments the sequence number in db, if it is |
| * not too high |
| * |
| * return values: |
| * |
| * srtp_err_status_ok no problem |
| * srtp_err_status_key_expired sequence number too high |
| * |
| */ |
| srtp_err_status_t srtp_rdb_increment(srtp_rdb_t *rdb); |
| |
| /* |
| * srtp_rdb_get_value(db) returns the current sequence number of db |
| */ |
| uint32_t srtp_rdb_get_value(const srtp_rdb_t *rdb); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| |
| #endif /* REPLAY_DB_H */ |