/*
 * Copyright (C) 2018 Rafael Ostertag
 *
 * This file is part of YAPET.
 *
 * YAPET 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.
 *
 * YAPET 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
 * YAPET.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Additional permission under GNU GPL version 3 section 7
 *
 * If you modify this program, or any covered work, by linking or combining it
 * with the OpenSSL project's OpenSSL library (or a modified version of that
 * library), containing parts covered by the terms of the OpenSSL or SSLeay
 * licenses, Rafael Ostertag grants you additional permission to convey the
 * resulting work.  Corresponding Source for a non-source form of such a
 * combination shall include the source code for the parts of OpenSSL used as
 * well as that of the covered work.
 */

#ifndef _KEY448_HH
#define _KEY448_HH 1

#include "key.hh"
#include "securearray.hh"

/**
 * @brief Namespace for cryptographic stuff
 *
 * Namespace for cryptographic stuff. Has no front-end and relies on
 * openssl.
 */
namespace yapet {
/**
 * @brief Converts the password into the 448bits key
 *
 * Converts the password into the key which is used by the other
 * cryptographic related classes.
 *
 * The key uses the maximum length of 448bits (56bytes) allowed
 * for blowfish.
 *
 * The key is computed using three passes. The first pass hashes
 * the password using the sha1 algorithm. This hash is then
 * re-hashed using md5 which is then appended to the key generated
 * by the previous pass (sha1 + md5). The last pass hashes the
 * result of the former two passes using RIPEMD-160 and appended
 * the result to the key (sha1 + md5 + ripemd160).
 *
 * The initialization vector is computed by hashing the key using
 * the md5 algorithm and taking only the first eight bytes.
 */
class Key448 : public Key {
   private:
    /**
     * @brief Holds the key
     *
     * This is the key used to encrypt and decrypt data.
     */
    SecureArray _key;
    /**
     * @brief Holds the initialization vector
     *
     * The initialization vector used for encryption and
     * decryption.
     */
    SecureArray _ivec;

    /**
     * Only used to satisfy interface. No influence on key generation.
     */
    MetaData _parameters;

   public:
    Key448();

    Key448(const Key448& k);
    Key448& operator=(const Key448& k);

    Key448(Key448&& k);
    Key448& operator=(Key448&& key);
    ~Key448(){};

    /**
     * This is a noop, this key does not support parameters.
     */
    void keyingParameters(const MetaData& parameters);

    /**
     * Will always return empty meta data.
     */
    const MetaData& keyingParameters() const;

    void password(const SecureArray& password);

    SecureArray key() const { return _key; }

    SecureArray::size_type keySize() const { return _key.size(); }

    SecureArray ivec() const { return _ivec; }

    SecureArray::size_type ivecSize() const { return _ivec.size(); }

    //! Compares two keys for equality
    bool operator==(const Key448& k) const;
    bool operator==(const Key& k) const;

    //! Compares two keys for inequality
    bool operator!=(const Key448& k) const;
    bool operator!=(const Key& k) const;
};

}  // namespace yapet

#endif  // _KEY448_HH