private static void PerformEncryptOperation(out string plainText, out string cipherText, out int shift)
{
AppMessage("Welcome to encryption mode \nEnter message to encrypt");
plainText = Console.ReadLine();
shift = 0; cipherText = string.Empty;
if (plainText != "")
{
try
{
AppMessage("Enter the shift");
shift = int.Parse(Console.ReadLine());
if (shift <= 26 && shift > 0)
{
AppMessage("Cipher is");
cipherText = new string(CaesarCipher.Encrypt(plainText, shift));
Console.WriteLine(cipherText);
}
else
{
ErrorMessage("Enter a number between 1 to 26");
}
}
catch (Exception e)
{
ErrorMessage(e.Message);
}
}
else
{
ErrorMessage("Invalid input");
}
}
private static void PerformDecryptOperation(out string filePath, out string fileName, ref string cipherText, out int shift, ref StreamReader sr)
{
shift = 0; fileName = string.Empty;
AppMessage("Welcome to decryption mode \nEnter the path of file to decrypt");
filePath = Console.ReadLine();
if (filePath != "")
{
AppMessage("Enter file name");
fileName = Console.ReadLine();
if (fileName != "")
{
filePath = filePath + "\\" + fileName;
AppMessage("Enter the shift");
try
{
shift = int.Parse(Console.ReadLine());
if (shift <= 26 && shift > 0)
{
sr = new System.IO.StreamReader(filePath);
cipherText = sr.ReadToEnd();
cipherText = new string(CaesarCipher.Decrypt(cipherText, shift));
AppMessage("Cipher is");
Console.WriteLine(cipherText);
sr.Close();
}
else
{
ErrorMessage("Enter a number between 1 to 26");
}
}
catch (Exception e)
{
ErrorMessage(e.Message);
}
}
else
{
ErrorMessage("File name cannot be empty");
}
}
else
{
ErrorMessage("Path is invalid");
}
}
