Index: libsrtp/crypto/include/rdb.h |
=================================================================== |
--- libsrtp/crypto/include/rdb.h (revision 0) |
+++ libsrtp/crypto/include/rdb.h (revision 0) |
@@ -0,0 +1,94 @@ |
+/* |
+ * 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 */ |
Property changes on: libsrtp/crypto/include/rdb.h |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |