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Squashed 'external/toxcore/c-toxcore/' content from commit 67badf69

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git-subtree-dir: external/toxcore/c-toxcore
git-subtree-split: 67badf69416a74e74f6d7eb51dd96f37282b8455
This commit is contained in:
Green Sky
2023-07-25 11:53:09 +02:00
commit 227425b90e
467 changed files with 116591 additions and 0 deletions
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toxcore/timed_auth.c Normal file
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/* SPDX-License-Identifier: GPL-3.0-or-later
* Copyright © 2019-2021 The TokTok team.
*/
#include "timed_auth.h"
#include <string.h>
#include "ccompat.h"
non_null(1,6) nullable(4)
static void create_timed_auth_to_hash(const Mono_Time *mono_time, uint16_t timeout, bool previous, const uint8_t *data,
uint16_t length, uint8_t *to_hash)
{
const uint64_t t = (mono_time_get(mono_time) / timeout) - (previous ? 1 : 0);
memcpy(to_hash, &t, sizeof(t));
if (data != nullptr) {
memcpy(to_hash + sizeof(t), data, length);
}
}
void generate_timed_auth(const Mono_Time *mono_time, uint16_t timeout, const uint8_t *key,
const uint8_t *data, uint16_t length, uint8_t *timed_auth)
{
VLA(uint8_t, to_hash, sizeof(uint64_t) + length);
create_timed_auth_to_hash(mono_time, timeout, false, data, length, to_hash);
crypto_hmac(timed_auth, key, to_hash, SIZEOF_VLA(to_hash));
}
bool check_timed_auth(const Mono_Time *mono_time, uint16_t timeout, const uint8_t *key, const uint8_t *data,
uint16_t length, const uint8_t *timed_auth)
{
VLA(uint8_t, to_hash, sizeof(uint64_t) + length);
for (uint8_t i = 0; i < 2; ++i) {
create_timed_auth_to_hash(mono_time, timeout, i != 0, data, length, to_hash);
if (crypto_hmac_verify(timed_auth, key, to_hash, SIZEOF_VLA(to_hash))) {
return true;
}
}
return false;
}