hush3/src/crypto/verus_hash.h

// (C) 2018 The Verus Developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.

/*
This provides the PoW hash function for Verus, enabling CPU mining.
*/
#ifndef VERUS_HASH_H_
#define VERUS_HASH_H_

#include <cstring>
#include <vector>

extern "C" 
{
#include "crypto/haraka.h"
}

class CVerusHash
{
    public:
        static void Hash(void *result, const void *data, size_t len);

        CVerusHash() {}

        CVerusHash &Write(const unsigned char *data, size_t len);

        CVerusHash &Reset()
        {
            curBuf = buf1;
            result = buf2;
            curPos = 0;
            std::fill(buf1, buf1 + sizeof(buf1), 0);
            std::fill(buf2, buf2 + sizeof(buf2), 0);
        }

        void Finalize(unsigned char hash[32])
        {
            if (curPos)
            {
                std::fill(curBuf + 32 + curPos, curBuf + 64, 0);
                haraka512(hash, curBuf);
            }
            else
                std::memcpy(hash, result, 32);
        }

    private:
        unsigned char buf1[64], buf2[64];
        unsigned char *curBuf = buf1, *result = buf2;
        size_t curPos = 0;
};

#endif