/*
 * steghide 0.5.1 - a steganography program
 * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

#ifndef SH_ENCALGO_H
#define SH_ENCALGO_H

#include <string>

class EncryptionAlgorithm {
  public:
    /// number of bits needed to code the algorithm
    static const unsigned int IRep_size = 5;

    /// integer representation of encryption algorithm
    enum IRep {
        NONE = 0,
        TWOFISH = 1,
        RIJNDAEL128 = 2,
        RIJNDAEL192 = 3,
        RIJNDAEL256 = 4,
        SAFERPLUS = 5,
        RC2 = 6,
        XTEA = 7,
        SERPENT = 8,
        SAFERSK64 = 9,
        SAFERSK128 = 10,
        CAST256 = 11,
        LOKI97 = 12,
        GOST = 13,
        THREEWAY = 14,
        CAST128 = 15,
        BLOWFISH = 16,
        DES = 17,
        TRIPLEDES = 18,
        ENIGMA = 19,
        ARCFOUR = 20,
        PANAMA = 21,
        WAKE = 22
    };

    EncryptionAlgorithm(void);
    EncryptionAlgorithm(IRep irep);
    /**
     * construct a new EncryptionAlgorithm object from a std::string representation
     * \param srep a valid(!) std::string representation
     **/
    EncryptionAlgorithm(std::string srep);

    void setValue(IRep irep);

    std::string getStringRep(void) const;
    IRep getIntegerRep(void) const;

    bool operator==(const EncryptionAlgorithm &algo) const { return (Value == algo.Value); };

    /**
     * check if srep is a valid std::string representation (w.r.t the Translations array)
     * \param srep a std::string that maybe represents an encryption algorithm fron the Translations
     *table \return true iff the Translations table contains srep
     **/
    static bool isValidStringRep(std::string srep);

    static bool isValidIntegerRep(unsigned int irep);

    /**
     * translate an integer representation into the corresponding std::string representation
     **/
    static std::string translate(IRep irep);

    /**
     * translate a valid std::string representation into the corresponding integer representation
     **/
    static IRep translate(std::string srep);

  private:
    static const unsigned int NumValues = 23;
    IRep Value;

    typedef struct struct_Translation {
        IRep irep;
        const char *srep;
    } Translation;
    static const Translation Translations[];
};

#endif // ndef SH_ENCALGO_H