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https://gitlab.torproject.org/tpo/core/tor.git
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2e9779e5d8
This migrates away from SHA1, and provides further hash flooding protection on top of the randomised siphash implementation. Add unit tests to make sure that different inputs don't have the same hash.
67 lines
1.5 KiB
C
67 lines
1.5 KiB
C
/* Copyright (c) 2012-2015, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file replaycache.h
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* \brief Header file for replaycache.c.
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**/
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#ifndef TOR_REPLAYCACHE_H
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#define TOR_REPLAYCACHE_H
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typedef struct replaycache_s replaycache_t;
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#ifdef REPLAYCACHE_PRIVATE
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struct replaycache_s {
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/* Scrub interval */
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time_t scrub_interval;
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/* Last scrubbed */
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time_t scrubbed;
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/*
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* Horizon
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* (don't return true on digests in the cache but older than this)
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*/
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time_t horizon;
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/*
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* Digest map: keys are digests, values are times the digest was last seen
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*/
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digest256map_t *digests_seen;
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};
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#endif /* REPLAYCACHE_PRIVATE */
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/* replaycache_t free/new */
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void replaycache_free(replaycache_t *r);
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replaycache_t * replaycache_new(time_t horizon, time_t interval);
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#ifdef REPLAYCACHE_PRIVATE
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/*
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* replaycache_t internal functions:
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*
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* These take the time to treat as the present as an argument for easy unit
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* testing. For everything else, use the wrappers below instead.
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*/
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STATIC int replaycache_add_and_test_internal(
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time_t present, replaycache_t *r, const void *data, size_t len,
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time_t *elapsed);
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STATIC void replaycache_scrub_if_needed_internal(
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time_t present, replaycache_t *r);
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#endif /* REPLAYCACHE_PRIVATE */
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/*
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* replaycache_t methods
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*/
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int replaycache_add_and_test(replaycache_t *r, const void *data, size_t len);
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int replaycache_add_test_and_elapsed(
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replaycache_t *r, const void *data, size_t len, time_t *elapsed);
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void replaycache_scrub_if_needed(replaycache_t *r);
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#endif
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