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| using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
{
class Program
{
public static T ReadValueFromConsole<T>(string message)
{
Console.ForegroundColor = ConsoleColor.Yellow;
Console.WriteLine(message);
Console.ForegroundColor = ConsoleColor.White;
while (true)
{
try
{
return (T)Convert.ChangeType(Console.ReadLine(), typeof(T));
}
catch (Exception)
{
Console.WriteLine("Возникла ошибка. Повторите ввод");
}
}
}
static void Main(string[] args)
{
ActivateMenu();
}
private static void ActivateMenu()
{
var alph = /*ReadValueFromConsole<string>("Введите алфавит");*/
// АБВГДЕЖЗИКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ
"АБВГДЕЖЗИКЛМНОПРСТУФХЦЧШЩЪЫЬЭЮЯ";
var key = ReadValueFromConsole<string>("\nВведите ключевое слово");
// ТОВАРИЩ
//"ТОВАРИЩ";
var pc = new PlayfairCipher(alph, key);
bool active = true;
while (active)
{
Console.Clear();
var choise = ReadValueFromConsole<int>(@"Выберите действие:
1. Зашифровать указанную строку
2. Десшифровать указанную строку
3. THERE IS NO ESCAPE");
switch (choise)
{
case 1:
Console.Clear();
Console.Write("Шифрование строки.");
var normalMessage = ReadValueFromConsole<string>("\nВведите строку для шифрования: ");
// КОД ПЛЕЙФЕЙЕРА ОСНОВАН НА ИСПОЛЬЗОВАНИИ МАТРИЦЫ БУКВ
// "КОД ПЛЕЙФЕЙЕРА ОСНОВАН НА ИСПОЛЬЗОВАНИИ МАТРИЦЫ БУКВ";
var crypted = pc.Crypt(normalMessage);
Console.WriteLine("\nResult: " + crypted);
Console.WriteLine("De-crypted back: " + pc.Uncrypt(crypted));
Console.ReadKey();
break;
case 2:
Console.Clear();
Console.Write("Дешифрование строки.");
var cryptedMessage = ReadValueFromConsole<string>("\nВведите строку для дешифровки: ");
// МОЩЕЯВЧЪЛТАПЯВМОМРЗФИЫПТБКВИХБЦБЩШЪЧШЩИВТЧОАДХОПАБТИВАРМЖИ
//"МОЩЕЯВЧЪЛТАПЯВМОМРЗФИЫПТБКВИХБЦБЩШЪЧШЩИВТЧОАДХОПАБТИВАРМЖИ";
var normal = pc.Uncrypt(cryptedMessage);
Console.WriteLine("\nResult: " + normal);
Console.WriteLine("Crypted back: " + pc.Crypt(normal));
Console.ReadKey();
break;
case 3:
active = new Random().Next(3) != 0;
if (!active)
{
Console.WriteLine("Lucky One");
Thread.Sleep(2 * 1000);
}
break;
default:
break;
}
}
}
}
class PlayfairCipher
{
string Alphabet { get; set; }
string KeyWord { get; set; }
public PlayfairCipher(string Alphabet, string KeyWord)
{
this.KeyWord = string.Join("",
KeyWord.ToLower()
.Replace("й", "и")
.Replace("ё", "е")
.Replace("ъ", "ь")
.Replace(" ", "")
.Distinct());
this.Alphabet = Alphabet.ToLower()
.Replace("й", "")
.Replace("ё", "")
.Replace(" ", "")
.Replace("ь", "");
}
public string Crypt(string Message)
{
Func<string[,], int[], int[], string> getPair = GetPairForCrypt;
return CryptOrUncrypt(Message, getPair);
}
public string Uncrypt(string Message)
{
Func<string[,], int[], int[], string> getPair = GetPairForUncrypt;
return CryptOrUncrypt(Message, getPair);
}
string CryptOrUncrypt(string Message, Func<string[,], int[], int[], string> GetPair)
{
var alphMatrix = CreateAlphMatrix();
var bigrams = CreateBigrams(Message);
var returnMessage = "";
var fIndex = new int[] { 0, 0 };
var sIndex = new int[] { 0, 0 };
foreach (var bi in bigrams)
{
fIndex = GetIndex(alphMatrix, bi.FirstLetter);
sIndex = GetIndex(alphMatrix, bi.SecondLetter);
returnMessage += GetPair(alphMatrix, fIndex, sIndex);
}
return returnMessage;
}
string GetPairForUncrypt(string[,] AplhMatrix, int[] FirstLetterIndexs, int[] SecondLetterIndexs)
{
string pair = "";
if (FirstLetterIndexs[0] == SecondLetterIndexs[0])
{
pair += AplhMatrix[
FirstLetterIndexs[0],
((FirstLetterIndexs[1] - 1 + AplhMatrix.GetLength(1)) % AplhMatrix.GetLength(1))];
pair += AplhMatrix[
SecondLetterIndexs[0],
((SecondLetterIndexs[1] - 1 + AplhMatrix.GetLength(1)) % AplhMatrix.GetLength(1))];
}
// В одном столбце
else if (FirstLetterIndexs[1] == SecondLetterIndexs[1])
{
pair += AplhMatrix[
((FirstLetterIndexs[0] - 1 + AplhMatrix.GetLength(0)) % AplhMatrix.GetLength(0)),
FirstLetterIndexs[1]];
pair += AplhMatrix[
((SecondLetterIndexs[0] - 1 + AplhMatrix.GetLength(0)) % AplhMatrix.GetLength(0)),
SecondLetterIndexs[1]];
}
// В одном блое
else
{
pair += AplhMatrix[
FirstLetterIndexs[0],
SecondLetterIndexs[1]];
pair += AplhMatrix[
SecondLetterIndexs[0],
FirstLetterIndexs[1]];
}
return pair;
}
string GetPairForCrypt(string[,] AplhMatrix, int[] FirstLetterIndexs, int[] SecondLetterIndexs)
{
string pair = "";
if (FirstLetterIndexs[0] == SecondLetterIndexs[0])
{
pair += AplhMatrix[
FirstLetterIndexs[0],
((FirstLetterIndexs[1] + 1) % AplhMatrix.GetLength(1))];
pair += AplhMatrix[
SecondLetterIndexs[0],
((SecondLetterIndexs[1] + 1) % AplhMatrix.GetLength(1))];
}
// В одном столбце
else if (FirstLetterIndexs[1] == SecondLetterIndexs[1])
{
pair += AplhMatrix[
((FirstLetterIndexs[0] + 1) % AplhMatrix.GetLength(0)),
FirstLetterIndexs[1]];
pair += AplhMatrix[
((SecondLetterIndexs[0] + 1) % AplhMatrix.GetLength(0)),
SecondLetterIndexs[1]];
}
// В одном блоке
else
{
pair += AplhMatrix[
FirstLetterIndexs[0],
SecondLetterIndexs[1]];
pair += AplhMatrix[
SecondLetterIndexs[0],
FirstLetterIndexs[1]];
}
return pair;
}
int[] GetIndex(string[,] matrix, string Letter)
{
for (int i = 0; i < matrix.GetLength(0); i++)
{
for (int j = 0; j < matrix.GetLength(1); j++)
{
if (matrix[i, j] == Letter)
return new int[] { i, j };
}
}
throw new Exception();
}
IEnumerable<Bigram> CreateBigrams(string normalMessage)
{
normalMessage = normalMessage.ToLower()
.Replace("й", "и")
.Replace("ё", "е")
.Replace("ь", "ъ")
.Replace(" ", "");
var temp = new List<Bigram>();
for (int i = 0; i < normalMessage.Length; i += 2)
{
if (i == normalMessage.Length - 1)
{
temp.Add(new Bigram()
{
FirstLetter = normalMessage[i].ToString(),
SecondLetter = "х"
});
}
else if (normalMessage[i] == normalMessage[i + 1])
{
temp.Add(new Bigram()
{
FirstLetter = normalMessage[i].ToString(),
SecondLetter = "х"
});
i--;
}
else
{
temp.Add(new Bigram()
{
FirstLetter = normalMessage[i].ToString(),
SecondLetter = normalMessage[i + 1].ToString()
});
}
}
return temp;
}
string[,] CreateAlphMatrix()
{
var let = (KeyWord + Alphabet).Select(x => x.ToString()).Distinct().ToArray();
var alphMatrix = new string[5, 6];
var temp_index = 0;
Debug.WriteLine("New alphabet:");
for (int i = 0; i < alphMatrix.GetLength(0); i++)
{
for (int j = 0; j < alphMatrix.GetLength(1); j++)
{
alphMatrix[i, j] = let[temp_index];
Debug.Write(alphMatrix[i, j] + " ");
temp_index++;
}
Debug.WriteLine("");
}
return alphMatrix;
}
class Bigram
{
public string FirstLetter { get; set; }
public string SecondLetter { get; set; }
public override string ToString()
{
return FirstLetter + " " + SecondLetter;
}
}
}
} |
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Сообщение было отмечено Ivan2117 как решение
Сообщение от Ivan2117
