thehub/libs/crypto/hmac_sha256.h

/*
 * 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_HMAC_SHA256_H
#define FLOWEE_CRYPTO_HMAC_SHA256_H

#include "sha256.h"

#include <cstdint>
#include <cstdlib>

/** A hasher class for HMAC-SHA-512. */
class CHMAC_SHA256
{
private:
    CSHA256 outer;
    CSHA256 inner;

public:
    static const size_t OUTPUT_SIZE = 32;

    CHMAC_SHA256(const unsigned char* key, size_t keylen);
    CHMAC_SHA256& write(const unsigned char* data, size_t len)
    {
        inner.write(data, len);
        return *this;
    }
    void finalize(unsigned char hash[OUTPUT_SIZE]);
};

#endif