(C++) Encranger

January 25, 2018 · View on GitHub

 

 

 

 

 

(C++) Encranger

 

STLQt CreatorLubuntu

 

Encranger is one of my own cryptography classes.

 

Encranger is used in, among others:

Technical facts

 

 

 

 

 

 

./CppEncranger/CppEncranger.pri

 

INCLUDEPATH += \     ../../Classes/CppEncranger SOURCES += \     ../../Classes/CppEncranger/encranger.cpp HEADERS  += \     ../../Classes/CppEncranger/encranger.h OTHER_FILES += \     ../../Classes/CppEncranger/Licence.txt

 

 

 

 

 

./CppEncranger/encranger.h

 

 

 

 

 

 

./CppEncranger/encranger.cpp

 

//--------------------------------------------------------------------------- /* Encranger, encryption and de-encryption class Copyright 2010-2015 Richel Bilderbeek 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 3 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, see <http://www.gnu.org/licenses/>. */ //--------------------------------------------------------------------------- // From http://www.richelbilderbeek.nl/ToolMultiEncranger.htm //--------------------------------------------------------------------------- #include "encranger.h" #include <algorithm> #include <cassert> #include <functional> #include <iostream> #include <stdexcept> #include <numeric> #include <vector> #include "testtimer.h" #include "trace.h" #include "loopreader.h" ribi::Encranger::Encranger(const int key) noexcept   : m_characters(CreateCharacters()),     m_table(CreateTable(key,CreateCharacters().size())) {   #ifndef NDEBUG   Test();   #endif } std::vector<int> ribi::Encranger::CreateTestKeys() noexcept {   std::vector<int> v;   int x=1;   for (int i=0; i!=16; ++i)   {     v.push_back(x);     x *= 2;   }   return v; } std::string ribi::Encranger::Encrypt(std::string s) const noexcept {   typedef std::string::iterator StringIterator;   typedef std::vector<int>::const_iterator LoopReaderIteratorType;   LoopReader<LoopReaderIteratorType> table_reader(m_table.begin(), m_table.end());   const StringIterator j = s.end();   for (StringIterator i = s.begin(); i!=j; ++i, table_reader.Next())   {     *i = Encrypt(*i,*table_reader.Read());   }   return s; } std::string ribi::Encranger::Deencrypt(std::string s) const noexcept {   typedef std::string::iterator StringIterator;   LoopReader<std::vector<int>::const_iterator> table_reader(m_table.begin(), m_table.end());   const StringIterator j = s.end();   for (StringIterator i = s.begin(); i!=j; ++i, table_reader.Next())   {     *i = Deencrypt(*i,*table_reader.Read());   }   return s; } char ribi::Encranger::Encrypt(const char c, const int d) const noexcept {   const int i = GetIndex(c);   const int n_chars = static_cast<int>(m_characters.size());   const int i_new = (i + d) % n_chars;   assert(i_new >= 0);   assert(i_new < static_cast<int>(m_characters.size()));   return m_characters[i_new]; } char ribi::Encranger::Deencrypt(const char c, const int d) const noexcept {   const int i = GetIndex(c);   const int n_chars = static_cast<int>(m_characters.size());   const int i_new = (i - d + n_chars) % n_chars;   assert(i_new >= 0);   assert(i_new < static_cast<int>(m_characters.size()));   return m_characters[i_new]; } int ribi::Encranger::GetIndex(const char c) const noexcept {   if (c == '\t' || c == '\n') return GetIndex(' ');   const std::vector<char>::const_iterator i     = std::find(m_characters.begin(), m_characters.end(), c);   assert(i!=m_characters.end());   return i - m_characters.begin(); } std::vector<int> ribi::Encranger::CreateTable(const int key, const unsigned int sz) const noexcept {   assert(sz != 0 && "Supplied table must not be of size zero");   std::vector<int> v(sz);   std::iota(v.begin(),v.end(),0);   //The key is the seed   std::srand(key);   //Shuffle   std::random_shuffle(std::begin(v),std::end(v));   return v; } std::vector<char> ribi::Encranger::CreateCharacters() noexcept {   std::vector<char> v;   //Uppercase   v.push_back('A');   v.push_back('B');   v.push_back('C');   v.push_back('D');   v.push_back('E');   v.push_back('F');   v.push_back('G');   v.push_back('H');   v.push_back('I');   v.push_back('J');   v.push_back('K');   v.push_back('L');   v.push_back('M');   v.push_back('N');   v.push_back('O');   v.push_back('P');   v.push_back('Q');   v.push_back('R');   v.push_back('S');   v.push_back('T');   v.push_back('U');   v.push_back('V');   v.push_back('W');   v.push_back('X');   v.push_back('Y');   v.push_back('Z');   //Lowercase   v.push_back('a');   v.push_back('b');   v.push_back('c');   v.push_back('d');   v.push_back('e');   v.push_back('f');   v.push_back('g');   v.push_back('h');   v.push_back('i');   v.push_back('j');   v.push_back('k');   v.push_back('l');   v.push_back('m');   v.push_back('n');   v.push_back('o');   v.push_back('p');   v.push_back('q');   v.push_back('r');   v.push_back('s');   v.push_back('t');   v.push_back('u');   v.push_back('v');   v.push_back('w');   v.push_back('x');   v.push_back('y');   v.push_back('z');   //Digits   v.push_back('0');   v.push_back('1');   v.push_back('2');   v.push_back('3');   v.push_back('4');   v.push_back('5');   v.push_back('6');   v.push_back('7');   v.push_back('8');   v.push_back('9');   //Above digits   v.push_back('!');   v.push_back('@');   v.push_back('#');   v.push_back('$');   v.push_back('%');   v.push_back('^');   v.push_back('&');   v.push_back('*');   v.push_back('(');   v.push_back(')');   //Other interpunction   v.push_back('~');   v.push_back('`');   v.push_back('-');   v.push_back('_');   v.push_back('=');   v.push_back('+');   v.push_back('[');   v.push_back(']');   v.push_back('{');   v.push_back('}');   v.push_back(';');   v.push_back(':');   v.push_back('\'');   v.push_back('\"');   v.push_back('<');   v.push_back('>');   v.push_back(',');   v.push_back('.');   v.push_back('/');   v.push_back('?');   v.push_back('\\');   v.push_back('|');   v.push_back(' ');   return v; } std::string ribi::Encranger::GetVersion() noexcept {   return "1.3"; } std::vector<std::string> ribi::Encranger::GetVersionHistory() noexcept {   return {     "2010-01-05: version 1.0: initial version",     "2011-01-12: version 1.1: added version info",     "2014-04-01: version 1.2: replaced use of custom Increase class by std::iota",     "2014-07-21: version 1.3: rigid testing"   }; } #ifndef NDEBUG void ribi::Encranger::Test() noexcept {   {     static bool is_tested{false};     if (is_tested) return;     is_tested = true;   }   const TestTimer test_timer(__func__,__FILE__,1.0);   //Test Increase   {     const std::size_t sz { 5 };     std::vector<int> v(sz);     //std::for_each(v.begin(), v.end(), Increase() );     std::iota(v.begin(),v.end(),0);     for (std::size_t i=0; i!=sz; ++i) { assert( v[i] == static_cast<int>(i) ); }   }   {     const std::vector<std::string> v {       "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz",       "a cde ghijklm opqrstuvwxyzabc efghijklmnopqrstuvwxyzabcdefghi klmnopqrstuvwxyz",       "a",       " a",       "a ",       " a ",       "  a  "     };     for (const std::string& s: v)     {       for (const int key: CreateTestKeys())       {         const Encranger e(key);         assert(e.Deencrypt(e.Encrypt(s)) == s);         //Test encryption with real, decryption with faker         const Encranger faker(key + 1);         if (faker.Deencrypt(e.Encrypt(s)) == s)         {           TRACE("ERROR");           TRACE(key);           TRACE(s);           TRACE("BREAK");         }         assert(faker.Deencrypt(e.Encrypt(s)) != s);       }     }   } } #endif