libcruft-crypto/hash/sha2.hpp

/*
 * 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 http://mozilla.org/MPL/2.0/.
 *
 * Copyright:
 *      2014, Danny Robson <danny@nerdcruft.net>
 */

#ifndef CRUFT_CRYPTO_HASH_SHA2_HPP
#define CRUFT_CRYPTO_HASH_SHA2_HPP

#include <cruft/util/view.hpp>

#include <array>
#include <cstdint>


///////////////////////////////////////////////////////////////////////////////
namespace cruft::crypto::hash {
    class SHA256 {
    public:
        typedef std::array<uint8_t,32> digest_t;

    public:
        digest_t operator() (cruft::view<const uint8_t*>) noexcept;

    private:
        void process (void);

        uint64_t m_total;
        std::array<uint32_t, 8> H;

        union {
            std::array<uint32_t, 16> M;
            std::array<uint8_t,  64> C;
        };
    };
}

#endif