/*
 * This file is part of the Flowee project
 * Copyright (C) 2014 The Bitcoin Core developers
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef FLOWEE_CRYPTO_SHA512_H
#define FLOWEE_CRYPTO_SHA512_H

#include <cstdint>
#include <cassert>
#include <string>

/** A hasher class for SHA-512. */
class CSHA512
{
private:
    uint64_t s[8];
    unsigned char buf[128];
    size_t bytes;

public:
    static const size_t OUTPUT_SIZE = 64;

    CSHA512();
    inline CSHA512& write(const char* data, int len) {
        assert(len >= 0);
        return write(reinterpret_cast<const unsigned char*>(data), size_t(len));
    }
    CSHA512& write(const unsigned char* data, size_t len);
    inline void finalize(char *hash) {
        return finalize(reinterpret_cast<unsigned char*>(hash));
    }
    void finalize(unsigned char hash[OUTPUT_SIZE]);
    CSHA512& reset();
};

#endif