Disk ARchive 2.4.2
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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 : http://dar.linux.free.fr/email.html 00020 /*********************************************************************/ 00021 // $Id: crypto.hpp,v 1.21 2011/01/09 17:25:58 edrusb Rel $ 00022 // 00023 /*********************************************************************/ 00024 // 00025 00029 00030 #ifndef CRYPTO_HPP 00031 #define CRYPTO_HPP 00032 00033 extern "C" 00034 { 00035 #if HAVE_GCRYPT_H 00036 #include <gcrypt.h> 00037 #endif 00038 } 00039 00040 #include "../my_config.h" 00041 #include <string> 00042 00043 #include "tronconneuse.hpp" 00044 #include "header_version.hpp" 00045 #include "secu_string.hpp" 00046 00047 namespace libdar 00048 { 00049 00051 00054 enum crypto_algo 00055 { 00056 crypto_none, 00057 crypto_scrambling, 00058 crypto_blowfish, 00059 crypto_aes256, 00060 crypto_twofish256, 00061 crypto_serpent256, 00062 crypto_camellia256 00063 }; 00064 00067 00068 extern void crypto_split_algo_pass(const secu_string & all, crypto_algo & algo, secu_string & pass); 00069 00070 00072 // 00073 // 00074 00077 class crypto_sym : public tronconneuse 00078 { 00079 public: 00080 crypto_sym(U_32 block_size, 00081 const secu_string & password, 00082 generic_file & encrypted_side, 00083 bool no_initial_shift, 00084 const archive_version & reading_ver, 00085 crypto_algo algo); //< must be a symetrical algo (else an exception is thrown) 00086 ~crypto_sym() { detruit(); }; 00087 00088 protected: 00089 U_32 encrypted_block_size_for(U_32 clear_block_size); 00090 U_32 clear_block_allocated_size_for(U_32 clear_block_size); 00091 U_32 encrypt_data(const infinint & block_num, 00092 const char *clear_buf, const U_32 clear_size, const U_32 clear_allocated, 00093 char *crypt_buf, U_32 crypt_size); 00094 U_32 decrypt_data(const infinint & block_num, 00095 const char *crypt_buf, const U_32 crypt_size, 00096 char *clear_buf, U_32 clear_size); 00097 00098 private: 00099 #if CRYPTO_AVAILABLE 00100 gcry_cipher_hd_t clef; //< used to encrypt/decrypt the data 00101 gcry_cipher_hd_t essiv_clef; //< used to build the Initialization Vector 00102 #endif 00103 size_t algo_block_size; //< the block size of the algorithm 00104 unsigned char *ivec; //< algo_block_size allocated in secure memory to be used as Initial Vector 00105 U_I algo_id; //< algo ID in libgcrypt 00106 archive_version reading_version; 00107 00108 secu_string pkcs5_pass2key(const secu_string & password, //< human provided password 00109 const std::string & salt, //< salt string 00110 U_I iteration_count, //< number of time to shake the melange 00111 U_I output_length); //< length of the string to return 00112 void dar_set_essiv(const secu_string & key); //< assign essiv from the given (hash) string 00113 void make_ivec(const infinint & ref, unsigned char *ivec, U_I size); 00114 void self_test(void); 00115 void detruit(); 00116 }; 00117 00119 00120 } // end of namespace 00121 00122 #endif