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https://github.com/TokTok/c-toxcore
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iphydf
028b017d79
This mainly saves spam in test logs, but may save some packets here and there, if nodes are randomly selected twice for GET_NODES and onion routing packets.
55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2022 The TokTok team.
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*/
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#ifndef C_TOXCORE_TOXCORE_SHARED_KEY_CACHE_H
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#define C_TOXCORE_TOXCORE_SHARED_KEY_CACHE_H
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#include <stdint.h> // uint*_t
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#include "crypto_core.h"
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#include "logger.h"
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#include "mem.h"
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#include "mono_time.h"
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/**
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* This implements a cache for shared keys, since key generation is expensive.
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*/
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typedef struct Shared_Key_Cache Shared_Key_Cache;
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/**
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* @brief Initializes a new shared key cache.
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* @param mono_time Time object for retrieving current time.
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* @param self_secret_key Our own secret key of length CRYPTO_SECRET_KEY_SIZE,
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* it must not change during the lifetime of the cache.
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* @param timeout Number of milliseconds, after which a key should be evicted.
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* @param keys_per_slot There are 256 slots, this controls how many keys are stored per slot and the size of the cache.
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* @return nullptr on error.
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*/
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non_null()
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Shared_Key_Cache *shared_key_cache_new(
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const Logger *log, const Mono_Time *mono_time, const Memory *mem,
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const uint8_t *self_secret_key,
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uint64_t timeout, uint8_t keys_per_slot);
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/**
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* @brief Deletes the cache and frees all resources.
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* @param cache Cache to delete or nullptr.
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*/
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nullable(1)
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void shared_key_cache_free(Shared_Key_Cache *cache);
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/**
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* @brief Looks up a key from the cache or computes it if it didn't exist yet.
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* @param cache Cache to perform the lookup on.
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* @param public_key Public key, used for the lookup and computation.
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*
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* @return The shared key of length CRYPTO_SHARED_KEY_SIZE, matching the public key and our secret key.
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* @return nullptr on error.
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*/
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non_null()
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const uint8_t* shared_key_cache_lookup(Shared_Key_Cache *cache, const uint8_t public_key[CRYPTO_PUBLIC_KEY_SIZE]);
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#endif // C_TOXCORE_TOXCORE_SHARED_KEY_CACHE_H
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