md5_hasher.hh

/*
 * Copyright (C) 2015 ScyllaDB
 */

/*
 * This file is part of Scylla.
 *
 * Scylla is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Scylla 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 Scylla.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#define CRYPTOPP_ENABLE_NAMESPACE_WEAK 1

#include <cryptopp/md5.h>
#include "hashing.hh"
#include "bytes.hh"

class md5_hasher {
    CryptoPP::Weak::MD5 hash{};
public:
    void update(const char* ptr, size_t length) {
        static_assert(sizeof(char) == sizeof(byte), "Assuming lengths will be the same");
        hash.Update(reinterpret_cast<const byte*>(ptr), length * sizeof(byte));
    }

    bytes finalize() {
        bytes digest{bytes::initialized_later(), CryptoPP::Weak::MD5::DIGESTSIZE};
        hash.Final(reinterpret_cast<unsigned char*>(digest.begin()));
        return digest;
    }

    std::array<uint8_t, CryptoPP::Weak::MD5::DIGESTSIZE> finalize_array() {
        std::array<uint8_t, CryptoPP::Weak::MD5::DIGESTSIZE> array;
        hash.Final(reinterpret_cast<unsigned char*>(array.data()));
        return array;
    }
};