libcruft-util/hash/siphash.hpp

44 lines
1.2 KiB
C++

/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Copyright 2016-2018 Danny Robson <danny@nerdcruft.net>
*/
#ifndef CRUFT_UTIL_HASH_SIPHASH_HPP
#define CRUFT_UTIL_HASH_SIPHASH_HPP
#include "../view.hpp"
#include <cstdint>
#include <type_traits>
namespace util::hash {
template <int CompressionsV = 2, int FinalisationsV = 4>
class siphash {
public:
using digest_t = std::uint64_t;
static constexpr auto compression_rounds = CompressionsV;
static constexpr auto finalisation_rounds = FinalisationsV;
siphash (std::array<uint64_t,2>) noexcept;
digest_t operator() (util::view<const std::uint8_t*> data) const noexcept;
private:
std::array<uint64_t,2> m_key;
};
};
#endif