1 /* 2 * steghide 0.5.1 - a steganography program 3 * Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at> 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License 7 * as published by the Free Software Foundation; either version 2 8 * of the License, or (at your option) any later version. 9 * 10 * This program is distributed in the hope that it will be useful, 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 * GNU General Public License for more details. 14 * 15 * You should have received a copy of the GNU General Public License 16 * along with this program; if not, write to the Free Software 17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 * 19 */ 20 21 #ifndef SH_ENCMODE_H 22 #define SH_ENCMODE_H 23 24 #include <string> 25 26 class EncryptionMode { 27 public: 28 /// number of bits needed to code the mode 29 static const unsigned int IRep_size = 3 ; 30 31 /// integer representation of encryption mode 32 enum IRep { 33 ECB = 0, 34 CBC = 1, 35 OFB = 2, 36 CFB = 3, 37 NOFB = 4, 38 NCFB = 5, 39 CTR = 6, 40 STREAM = 7 41 } ; 42 43 /** 44 * construct a new EncryptionMode object setting Value to ECB 45 **/ 46 EncryptionMode (void) ; 47 EncryptionMode (IRep irep) ; 48 /** 49 * construct a new EncryptionMode object from a std::string representation 50 * \param srep a valid(!) std::string representation 51 **/ 52 EncryptionMode (std::string srep) ; 53 54 void setValue (IRep irep) ; 55 56 std::string getStringRep (void) const ; 57 IRep getIntegerRep (void) const ; 58 59 bool operator== (const EncryptionMode& mode) const 60 { return (Value == mode.Value) ; } ; 61 62 static bool isValidStringRep (std::string srep) ; 63 static bool isValidIntegerRep (unsigned int irep) ; 64 65 static std::string translate (IRep irep) ; 66 static IRep translate (std::string srep) ; 67 68 private: 69 static const unsigned int NumValues = 8 ; 70 IRep Value ; 71 72 typedef struct struct_Translation { 73 IRep irep ; 74 char* srep ; 75 } Translation ; 76 static const Translation Translations[] ; 77 } ; 78 79 #endif // ndef SH_ENCMODE_H 80