static void Main(string[] args)
{
//loop that runs the program
int runProgramChoice = 1;
while (runProgramChoice == 1)
{
//variables
Stopwatch timer = new Stopwatch();
TimeSpan encryptTime = TimeSpan.Zero;
string text = "";
byte[][] key = new byte[1][];
byte[][] iv = new byte[1][];
byte[] encrypted = null;
byte[] decrypted = null;
int encryptionChoice;
//input from user to select encryption method and what text to encrypt
Console.WriteLine("1. AES\n2. DES\n3. Triple DES");
encryptionChoice = MenuChoose(1, 3);
Console.WriteLine("What do you want to encrypt?");
text = Console.ReadLine();
//timer to get how long the encryption took
timer.Start();
switch (encryptionChoice)
{
//AES encryption
case 1:
//key and iv is generated
key[0] = NumberGenerator.Generate(32);
iv[0] = NumberGenerator.Generate(16);
//text is encrypted
encrypted = AES.Encrypt(Encoding.UTF8.GetBytes(text), key[0], iv[0]);
//time is saved and reset, so we can get decryption time
timer.Stop();
encryptTime = timer.Elapsed;
timer.Reset();
timer.Start();
//text is decryption
decrypted = AES.Decrypt(encrypted, key[0], iv[0]);
break;
//DES encryption
case 2:
//key and iv is generated
key[0] = NumberGenerator.Generate(8);
iv[0] = NumberGenerator.Generate(8);
//text is encrypted
encrypted = DES.Encrypt(Encoding.UTF8.GetBytes(text), key[0], iv[0]);
//time is saved and reset, so we can get decryption time
encryptTime = timer.Elapsed;
timer.Reset();
timer.Start();
//text is decryption
decrypted = DES.Decrypt(encrypted, key[0], iv[0]);
break;
//Triple DES encryption
case 3:
//key and iv is generated
key = new byte[3][];
iv = new byte[3][];
for (int i = 0; i < 3; i++)
{
key[i] = NumberGenerator.Generate(8);
iv[i] = NumberGenerator.Generate(8);
}
//text is encrypted
encrypted = Encoding.UTF8.GetBytes(text);
for (int i = 0; i < 3; i++)
{
encrypted = DES.Encrypt(encrypted, key[i], iv[i]);
}
//time is saved and reset, so we can get decryption time
encryptTime = timer.Elapsed;
timer.Reset();
timer.Start();
//text is decryption
decrypted = encrypted;
for (int i = 2; i > -1; i--)
{
decrypted = DES.Decrypt(decrypted, key[i], iv[i]);
}
break;
}
//decryption timer is stopped
timer.Stop();
//writes the key, iv encrypted tex and decrypted text
Console.WriteLine();
foreach (byte[] b in key)
{
Console.WriteLine("Key: " + Convert.ToBase64String(b));
}
foreach (byte[] b in iv)
{
Console.WriteLine("IV: " + Convert.ToBase64String(b));
}
Console.WriteLine("\nEncrypted");
Console.WriteLine(Convert.ToBase64String(encrypted));
Console.WriteLine("Decrypted");
Console.WriteLine(Encoding.UTF8.GetString(decrypted));
Console.WriteLine("\nEncrypt time: " + encryptTime + "\nDecrypt time: " + timer.Elapsed);
//choose to try again or exit program
Console.WriteLine("\n1. Try again\n2. Exit");
runProgramChoice = MenuChoose(1, 2);
Console.Clear();
}
}