/*
 * 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, int FinalisationsV>
    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