mirror of
https://github.com/TokTok/c-toxcore
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iphydf
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later
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* Copyright © 2019-2026 The TokTok team.
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*/
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#include "timed_auth.h"
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#include <string.h>
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#include "attributes.h"
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#include "ccompat.h"
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#include "crypto_core.h"
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#include "mono_time.h"
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static void create_timed_auth_to_hash(const Mono_Time *_Nonnull mono_time, uint16_t timeout, bool previous, const uint8_t *_Nullable data,
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uint16_t length, uint8_t *_Nonnull to_hash)
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{
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const uint64_t t = (mono_time_get(mono_time) / timeout) - (previous ? 1 : 0);
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memcpy(to_hash, &t, sizeof(t));
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if (data != nullptr) {
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memcpy(to_hash + sizeof(t), data, length);
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}
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}
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void generate_timed_auth(const Mono_Time *mono_time, uint16_t timeout, const uint8_t *key,
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const uint8_t *data, uint16_t length, uint8_t *timed_auth)
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{
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const uint16_t to_hash_size = sizeof(uint64_t) + length;
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VLA(uint8_t, to_hash, to_hash_size);
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create_timed_auth_to_hash(mono_time, timeout, false, data, length, to_hash);
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crypto_hmac(timed_auth, key, to_hash, to_hash_size);
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}
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bool check_timed_auth(const Mono_Time *mono_time, uint16_t timeout, const uint8_t *key, const uint8_t *data,
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uint16_t length, const uint8_t *timed_auth)
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{
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const uint16_t to_hash_size = sizeof(uint64_t) + length;
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VLA(uint8_t, to_hash, to_hash_size);
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for (uint8_t i = 0; i < 2; ++i) {
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create_timed_auth_to_hash(mono_time, timeout, i != 0, data, length, to_hash);
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if (crypto_hmac_verify(timed_auth, key, to_hash, to_hash_size)) {
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return true;
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}
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}
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return false;
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}
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