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