static public string DeCipherENG(string FileText, int key)
{
if (key == 0 || key == 1)
{
return(FileText);
}
string text = SomeInstruments.ForText(FileText.ToLower());
int row, period = 2 * (key - 1), k = 0;
var a = new string[key, text.Length];
var _DeChipherText = new char[text.Length];
for (int j = 0; j < key; j++)
{
for (int i = 0; i < text.Length; i++)
{
row = key - 1 - Math.Abs(key - 1 - i % period);
if (row == j)
{
_DeChipherText[i] = text[k++];
}
}
}
string result = SomeInstruments.CreateText(FileText, string.Join("", _DeChipherText));
return(result);
}
static public string Cipher(string FileText, string key)
{
key = key.ToLower();
var _text = SomeInstruments.ForText(FileText.ToLower());
var _bigRam = new List <string>();
var _resBigRam = new List <string>();
foreach (var item in PrepString(_text))
{
_bigRam.Add(item);
}
string temp, _key = CreateKey(key);
int _first, _second, dif;
foreach (var item in _bigRam)
{
if (_key.IndexOf(item[0]) / 5 == _key.IndexOf(item[1]) / 5) // one row
{
_first = (_key.IndexOf(item[0]) + 1) % 5 == 0 ? _key.IndexOf(item[0]) - 4 : _key.IndexOf(item[0]) + 1;
_second = (_key.IndexOf(item[1]) + 1) % 5 == 0 ? _key.IndexOf(item[1]) - 4 : _key.IndexOf(item[1]) + 1;
temp = _key[_first].ToString() + _key[_second].ToString();
}
else if (_key.IndexOf(item[0]) % 5 == _key.IndexOf(item[1]) % 5) // one column
{
_first = (_key.IndexOf(item[0]) + 5) % 25;
_second = (_key.IndexOf(item[1]) + 5) % 25;
temp = _key[_first].ToString() + _key[_second].ToString();
}
else // dif angle square
{
dif = _key.IndexOf(item[0]) % 5 - _key.IndexOf(item[1]) % 5;
_first = _key.IndexOf(item[0]) - dif;
_second = _key.IndexOf(item[1]) + dif;
temp = _key[_first].ToString() + _key[_second].ToString();
}
_resBigRam.Add(temp);
}
string _result = "";
foreach (var item in _resBigRam)
{
_result += item;
}
_result = SomeInstruments.CreateText(FileText, _result);
return(_result);
}
static public string CipherENG(string FileText, int key)
{
if (key == 0 || key == 1)
{
return(FileText);
}
string text = SomeInstruments.ForText(FileText.ToLower());
var _CipherText = new string[key];
int row, period = 2 * (key - 1);
for (int i = 0; i < text.Length; i++)
{
row = key - 1 - Math.Abs(key - 1 - i % period);
_CipherText[row] += text[i];
}
string result = SomeInstruments.CreateText(FileText, string.Join("", _CipherText));
return(result);
}
static public string Cipher(string FileText, string key)
{
string text = SomeInstruments.ForText(FileText.ToLower());
string result = "";
text.ToLower();
// create a key
int _priLenKey = key.Length;
while (key.Length < text.Length)
{
key += alphabet[(alphabet.IndexOf(key[key.Length - _priLenKey]) + 1) % 26];
}
// create chiphertext
int _index;
for (int i = 0; i < text.Length; i++)
{
_index = (alphabet.IndexOf(text[i]) + alphabet.IndexOf(key[i])) % 26;
result += alphabet[_index];
}
return(SomeInstruments.CreateText(FileText, result));
}
static public string DeCipher(string FileText, string key)
{
key = key.ToLower();
var _text = SomeInstruments.ForText(FileText.ToLower());
var _bigRam = new List <string>();
var _resBigRam = new List <string>();
foreach (var item in PrepString(_text))
{
_bigRam.Add(item);
}
string temp, _key = CreateKey(key);
int _first, _second, dif;
foreach (var item in _bigRam)
{
if (_key.IndexOf(item[0]) / 5 == _key.IndexOf(item[1]) / 5) // one row
{
_first = _key.IndexOf(item[0]) % 5 == 0 ? _key.IndexOf(item[0]) + 4 : _key.IndexOf(item[0]) - 1;
_second = _key.IndexOf(item[1]) % 5 == 0 ? _key.IndexOf(item[1]) + 4 : _key.IndexOf(item[1]) - 1;
temp = _key[_first].ToString() + _key[_second].ToString();
}
else if (_key.IndexOf(item[0]) % 5 == _key.IndexOf(item[1]) % 5) // one column
{
_first = _key.IndexOf(item[0]) - 5 < 0 ? 25 - 5 + _key.IndexOf(item[0]) : _key.IndexOf(item[0]) - 5;
_second = _key.IndexOf(item[1]) - 5 < 0 ? 25 - 5 + _key.IndexOf(item[1]) : _key.IndexOf(item[1]) - 5;
temp = _key[_first].ToString() + _key[_second].ToString();
}
else // dif angle square
{
dif = _key.IndexOf(item[0]) % 5 - _key.IndexOf(item[1]) % 5;
_first = _key.IndexOf(item[0]) - dif;
_second = _key.IndexOf(item[1]) + dif;
temp = _key[_first].ToString() + _key[_second].ToString();
}
_resBigRam.Add(temp);
}
string _result = "";
foreach (var item in _resBigRam)
{
_result += item;
}
if (_result[_result.Length - 1] == 'x')
{
_result = _result.Substring(0, _result.Length - 1);
}
string _temp = "";
for (int i = 0; i < _result.Length; i++)
{
if (!(_result[i] == 'x' && _result[i - 1] == _result[i + 1]))
{
_temp += _result[i];
}
}
_result = SomeInstruments.CreateText(FileText, _temp);
return(_result);
}
