libcruft-util/hash/md5.hpp

/*
 * 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 2013 Danny Robson <danny@nerdcruft.net>
 */

#ifndef __UTIL_HASH_MD5_HPP
#define __UTIL_HASH_MD5_HPP

#include <array>
#include <cstdint>
#include <cstdlib>


///////////////////////////////////////////////////////////////////////////////
namespace util::hash {
    class MD5 {
    public:
        typedef std::array<uint8_t,16> digest_t;
        static const size_t BLOCK_SIZE  = 64;
        static const size_t DIGEST_SIZE = 16;

    public:
        MD5();

        void update (const void    *restrict data, size_t len) noexcept;
        void update (const uint8_t *restrict first, const uint8_t *restrict last) noexcept;

        void finish (void);
        digest_t digest (void) const;
        void reset (void);

    private:
        void transform (void);

        uint64_t m_total;
        std::array<uint32_t, 4> ABCD;

        union {
            uint32_t X [16];
            uint8_t  Xb[64];
        };
    };
}

#endif