# crypto.hpp

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    00001 //*********************************************************************/
    00002 // dar - disk archive - a backup/restoration program
    00003 // Copyright (C) 2002-2052 Denis Corbin
    00004 //
    00005 // This program is free software; you can redistribute it and/or
    00006 // modify it under the terms of the GNU General Public License
    00007 // as published by the Free Software Foundation; either version 2
    00008 // of the License, or (at your option) any later version.
    00009 //
    00010 // This program is distributed in the hope that it will be useful,
    00011 // but WITHOUT ANY WARRANTY; without even the implied warranty of
    00012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    00013 // GNU General Public License for more details.
    00014 //
    00015 // You should have received a copy of the GNU General Public License
    00016 // along with this program; if not, write to the Free Software
    00017 // Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
    00018 //
    00019 // to contact the author : dar.linux@free.fr
    00020 /*********************************************************************/
    00021 // $Id: crypto.hpp,v 1.8.2.3 2008/05/09 20:58:27 edrusb Rel $
    00022 //
    00023 /*********************************************************************/
    00024 //
    00025
    00028
    00029 #ifndef CRYPTO_HPP
    00030 #define CRYPTO_HPP
    00031
    00032 extern "C"
    00033 {
    00034 #if HAVE_OPENSSL_BLOWFISH_H
    00035 #include <openssl/blowfish.h>
    00036 #endif
    00037 }
    00038
    00039 #include "../my_config.h"
    00040 #include <string>
    00041
    00042 #include "tronconneuse.hpp"
    00043 #include "header_version.hpp"
    00044
    00045 namespace libdar
    00046 {
    00047
    00049
    00052     enum crypto_algo
    00053     {
    00054         crypto_none,
    00055         crypto_scrambling,
    00056         crypto_blowfish,
    00057         crypto_blowfish_weak
    00058     };
    00059
    00060     extern void crypto_split_algo_pass(const std::string & all, crypto_algo & algo, std::string & pass);
    00061
    00063
    00066     class blowfish : public tronconneuse
    00067     {
    00068     public:
    00069         blowfish(user_interaction & dialog, U_32 block_size, const std::string & password, generic_file & encrypted_side,
    00070                  const dar_version & reading_ver, bool weak_mode);
    00071             // destructor does not seems to be required for BF_KEY
    00072
    00073     protected:
    00074         U_32 encrypted_block_size_for(U_32 clear_block_size);
    00075         U_32 clear_block_allocated_size_for(U_32 clear_block_size);
    00076         U_32 encrypt_data(const infinint & block_num,
    00077                           const char *clear_buf, const U_32 clear_size, const U_32 clear_allocated,
    00078                           char *crypt_buf, U_32 crypt_size);
    00079         U_32 decrypt_data(const infinint & block_num,
    00080                           const char *crypt_buf, const U_32 crypt_size,
    00081                           char *clear_buf, U_32 clear_size);
    00082
    00083     private:
    00084 #if HAVE_OPENSSL_BLOWFISH_H
    00085         BF_KEY clef;       //< used to encrypt/decrypt the data
    00086         BF_KEY essiv_clef; //< used to build the Initialization Vector
    00087 #endif
    00088         bool x_weak_mode;
    00089         dar_version reading_version;
    00090
    00091         void make_ivec(const infinint & ref, unsigned char ivec[8]);
    00092         std::string pkcs5_pass2key(const std::string & password,         //< human provided password
    00093                                    const std::string & salt,             //< salt string
    00094                                    U_I iteration_count,                  //< number of time to shake the melange
    00095                                    U_I output_length);                   //< length of the string to return
    00096         void dar_set_key(const std::string & key);                       //< assign both keys from the given (hash) string
    00097         void self_test(void);
    00098     };
    00099
    00100 } // end of namespace
    00101
    00102 #endif