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/*
* Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* SPDX-License-Identifier: MPL-2.0
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, you can obtain one at https://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
#include <inttypes.h>
#include <stdbool.h>
#include <stddef.h>
#include <isc/ascii.h>
#include <isc/hash.h> /* IWYU pragma: keep */
#include <isc/random.h>
#include <isc/result.h>
#include <isc/siphash.h>
#include <isc/string.h>
#include <isc/types.h>
#include <isc/util.h>
static uint8_t isc_hash_key[16];
void
isc__hash_initialize(void) {
/*
* Set a constant key to help in problem reproduction should
* fuzzing find a crash or a hang.
*/
uint8_t key[16] = { 1 };
#if !FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
isc_random_buf(key, sizeof(key));
#endif /* if FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION */
STATIC_ASSERT(sizeof(key) >= sizeof(isc_hash_key),
"sizeof(key) < sizeof(isc_hash_key)");
memmove(isc_hash_key, key, sizeof(isc_hash_key));
}
const void *
isc_hash_get_initializer(void) {
return isc_hash_key;
}
void
isc_hash_set_initializer(const void *initializer) {
REQUIRE(initializer != NULL);
memmove(isc_hash_key, initializer, sizeof(isc_hash_key));
}
void
isc_hash32_init(isc_hash32_t *restrict state) {
isc_halfsiphash24_init(state, isc_hash_key);
}
void
isc_hash32_hash(isc_hash32_t *restrict state, const void *data,
const size_t length, const bool case_sensitive) {
REQUIRE(length == 0 || data != NULL);
isc_halfsiphash24_hash(state, data, length, case_sensitive);
}
uint32_t
isc_hash32_finalize(isc_hash32_t *restrict state) {
uint32_t hval;
isc_halfsiphash24_finalize(state, (uint8_t *)&hval);
return hval;
}
void
isc_hash64_init(isc_hash64_t *restrict state) {
isc_siphash24_init(state, isc_hash_key);
}
void
isc_hash64_hash(isc_hash64_t *restrict state, const void *data,
const size_t length, const bool case_sensitive) {
REQUIRE(length == 0 || data != NULL);
isc_siphash24_hash(state, data, length, case_sensitive);
}
uint64_t
isc_hash64_finalize(isc_hash64_t *restrict state) {
uint64_t hval;
isc_siphash24_finalize(state, (uint8_t *)&hval);
return hval;
}
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