/usr/include/srtp/rdb.h is in libsrtp0-dev 1.4.4+20100615~dfsg-1build1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 | /*
* replay-database.h
*
* interface for a replay database for packet security
*
* David A. McGrew
* Cisco Systems, Inc.
*/
#ifndef REPLAY_DB_H
#define REPLAY_DB_H
#include "integers.h" /* for uint32_t */
#include "datatypes.h" /* for v128_t */
#include "err.h" /* for err_status_t */
/*
* 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;
} rdb_t;
#define rdb_bits_in_bitmask (8*sizeof(v128_t))
/*
* rdb init
*
* initalizes rdb
*
* returns err_status_ok on success, err_status_t_fail otherwise
*/
err_status_t
rdb_init(rdb_t *rdb);
/*
* rdb_check
*
* checks to see if index appears in rdb
*
* returns err_status_fail if the index already appears in rdb,
* returns err_status_ok otherwise
*/
err_status_t
rdb_check(const rdb_t *rdb, uint32_t rdb_index);
/*
* rdb_add_index
*
* adds index to rdb_t (and does *not* check if index appears in db)
*
* returns err_status_ok on success, err_status_fail otherwise
*
*/
err_status_t
rdb_add_index(rdb_t *rdb, uint32_t rdb_index);
/*
* the functions rdb_increment() and rdb_get_value() are for use by
* senders, not receivers - DO NOT use these functions on the same
* rdb_t upon which rdb_add_index is used!
*/
/*
* rdb_increment(db) increments the sequence number in db, if it is
* not too high
*
* return values:
*
* err_status_ok no problem
* err_status_key_expired sequence number too high
*
*/
err_status_t
rdb_increment(rdb_t *rdb);
/*
* rdb_get_value(db) returns the current sequence number of db
*/
uint32_t
rdb_get_value(const rdb_t *rdb);
#endif /* REPLAY_DB_H */
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