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add srtp
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@1086 d0543943-73ff-0310-b7d9-9358b9ac24b2
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94
libs/srtp/crypto/include/rdb.h
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94
libs/srtp/crypto/include/rdb.h
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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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#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 err_status_t */
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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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} rdb_t;
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#define rdb_bits_in_bitmask (8*sizeof(v128_t))
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/*
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* rdb init
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*
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* initalizes rdb
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*
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* returns err_status_ok on success, err_status_t_fail otherwise
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*/
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err_status_t
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rdb_init(rdb_t *rdb);
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/*
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* 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 err_status_fail if the index already appears in rdb,
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* returns err_status_ok otherwise
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*/
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err_status_t
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rdb_check(const rdb_t *rdb, uint32_t index);
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/*
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* rdb_add_index
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*
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* adds index to rdb_t (and does *not* check if index appears in db)
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*
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* returns err_status_ok on success, err_status_fail otherwise
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*
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*/
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err_status_t
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rdb_add_index(rdb_t *rdb, uint32_t index);
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/*
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* the functions rdb_increment() and 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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* rdb_t upon which rdb_add_index is used!
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*/
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/*
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* 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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* err_status_ok no problem
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* err_status_key_expired sequence number too high
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*
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*/
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err_status_t
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rdb_increment(rdb_t *rdb);
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/*
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* rdb_get_value(db) returns the current sequence number of db
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*/
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uint32_t
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rdb_get_value(const rdb_t *rdb);
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#endif /* REPLAY_DB_H */
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