public char[] Decrypt(char[] cipherText, List <dynamic> key)
{
char[,,] grid;
char[] plainText;
char character;
int i, j;
GridShape gridShape;
gridShape = new GridShape(key[0], key[1]);
grid = new char[(cipherText.Length - 1) / gridShape.Area + 1, gridShape.Width, gridShape.Height];
//Filling up the grid by columns from the cipher text
using (var myGrid = new GridByColumns(grid))
{
for (i = 0; i < cipherText.Length; i++)
{
myGrid[i] = cipherText[i];
}
}
//Reading from grid row by row to fill plainText, ignoring underscore fillers
using (var myGrid = new GridByRows(grid))
{
plainText = new char[myGrid.Size];
for (i = 0, j = 0; i < myGrid.Size; i++)
{
character = myGrid[i];
if ('_' != character)
{
plainText[j] = character;
j++;
}
}
}
return(plainText);
}
public char[] Encrypt(char[] plainText, List <dynamic> key)
{
char[,,] grid;
char[] cipherText;
int i;
GridShape gridShape;
gridShape = new GridShape(key[0], key[1]);
//Array of 2D grids, size as given by gridShape
grid = new char[(plainText.Length - 1) / gridShape.Area + 1, gridShape.Width, gridShape.Height];
//Filling up the grid by rows, first with the plain text then underscores as fillers
using (var myGrid = new GridByRows(grid))
{
for (i = 0; i < plainText.Length; i++)
{
myGrid[i] = plainText[i];
}
for (; i < myGrid.Size; i++)
{
myGrid[i] = '_';
}
}
//Reading from grid column by column to fill cipherText
using (var myGrid = new GridByColumns(grid))
{
cipherText = new char[myGrid.Size];
for (i = 0; i < myGrid.Size; i++)
{
cipherText[i] = myGrid[i];
}
}
return(cipherText);
}