public static string Encrypt(string clearText, string key)
{
char[][] firstTable = new char[(int)Math.Ceiling((float)clearText.Length / key.Length + 1)][];
for (int i = 0; i < firstTable.Length; i++)
{
firstTable[i] = new char[key.Length];
}
for (int j = 0; j < firstTable[0].Length; j++)
{
firstTable[0][j] = key[j];
}
for (int i = 1; i < firstTable.Length; i++)
{
for (int j = 0; j < firstTable[i].Length; j++)
{
int tempId = (i - 1) * firstTable[i].Length + j;
if (tempId < clearText.Length)
{
firstTable[i][j] = clearText[tempId];
}
else
{
firstTable[i][j] = ' ';
}
}
}
char[][] secondTable = new char[firstTable.Length][];
int[] shuffle = LetterMap(key);
for (int i = 0; i < firstTable.Length; i++)
{
secondTable[i] = new char[firstTable[i].Length];
for (int j = 0; j < firstTable[i].Length; j++)
{
secondTable[i][shuffle[j]] = firstTable[i][j];
}
}
for (int i = 1; i < secondTable.Length; i++)
{
for (int j = 0; j < secondTable[i].Length; j++)
{
if (secondTable[i][j] != ' ')
{
secondTable[i][j] = Vigenere.Encrypt(secondTable[i][j], secondTable[0][j]);
}
}
}
string result = "";
for (int multipleOfFive = 0;
multipleOfFive < (int)Math.Ceiling((float)secondTable.Length / 5);
multipleOfFive++)
{
for (int j = 0; j < secondTable[0].Length; j++)
{
for (int i = 0; i < 5; i++)
{
int x = i + multipleOfFive * 5 + 1;
if (x < secondTable.Length &&
secondTable[x][j] != ' ')
{
result += secondTable[x][j];
}
}
}
}
return(result);
}
public static string Decrypt(string encryptedText, string key)
{
var secondTable = new char[(int)Math.Ceiling((float)encryptedText.Length / key.Length + 1)][];
var invertedShuffle = Invert(LetterMap(key));
for (int i = 0; i < secondTable.Length; i++)
{
secondTable[i] = new char[key.Length];
}
int block = 0;
var sortedKey = new string (key.OrderBy(c => c).ToArray());
for (int i = 0; i < secondTable[0].Length; i++)
{
secondTable[0][i] = sortedKey[i];
}
while (encryptedText.Length != 0)
{
if (encryptedText.Length >= key.Length * 5)
{
//chop the entire block
for (int j = 0; j < secondTable[0].Length; j++)
{
for (int i = 0; i < 5; i++)
{
//Console.Write(encryptedText[0]);
secondTable[block * 5 + i + 1][j] = Vigenere.Decrypt(encryptedText[0], secondTable[0][j]);
encryptedText = encryptedText.Remove(0, 1);
}
}
block++;
}
else
{
//fiddle with the thing
int fullRows = encryptedText.Length / key.Length;
int lastRowCount = encryptedText.Length - (fullRows * key.Length);
//Console.Write(fullRows + " ");
//Console.Write(lastRowCount + " ");
foreach (var i in invertedShuffle)
{
//Console.Write(i);
}
//Console.WriteLine();
for (int j = 0; j < secondTable[0].Length; j++)
{
for (int i = 0; i <= fullRows; i++)
{
if (i < fullRows)
{
//Console.Write(encryptedText[0]);
secondTable[block * 5 + i + 1][j] = Vigenere.Decrypt(encryptedText[0], secondTable[0][j]);
encryptedText = encryptedText.Remove(0, 1);
}
else if (lastRowCount > 0)
{
if (invertedShuffle[j] < lastRowCount)
{
//Console.Write(encryptedText[0]);
secondTable[block * 5 + i + 1][j] = Vigenere.Decrypt(encryptedText[0], secondTable[0][j]);
encryptedText = encryptedText.Remove(0, 1);
}
else
{
//Console.Write(' ');
secondTable[block * 5 + i + 1][j] = ' ';
}
}
}
}
}
}
//Console.WriteLine();
foreach (var row in secondTable)
{
foreach (var c in row)
{
//Console.Write(c);
}
//Console.WriteLine();
}
//Console.WriteLine();
char[][] firstTable = new char[secondTable.Length][];
for (int i = 0; i < firstTable.Length; i++)
{
firstTable[i] = new char[secondTable[i].Length];
}
for (int i = 0; i < firstTable.Length; i++)
{
for (int j = 0; j < firstTable[i].Length; j++)
{
firstTable[i][invertedShuffle[j]] = secondTable[i][j];
}
}
string result = "";
for (int i = 1; i < firstTable.Length; i++)
{
for (int j = 0; j < firstTable[i].Length; j++)
{
result += firstTable[i][j];
}
}
return(result);
}