Rijndael algorithm (How to create our own Key )

Question

All the samples for Rijndael algorithm are defining the key from the Rijndael class itself, can\'t we provide the Key of our own. Any hint on this will help me a lot.

Th

Answer 1

What do you mean by cannot provide the key of our own? Here's an example on how you do it.

public static string Encrypt(string Text, byte[] key, byte[] VectorBytes){
    try{
        byte[] TextBytes = Encoding.UTF8.GetBytes(Text);        
        RijndaelManaged rijKey = new RijndaelManaged();
        rijKey.Mode = CipherMode.CBC; 
        ICryptoTransform encryptor = rijKey.CreateEncryptor(key,VectorBytes); 
        MemoryStream memoryStream = new MemoryStream(); 
        cryptoStream.Write(TextBytes, 0, TextBytes.Length); 
        cryptoStream.FlushFinalBlock(); 
        byte[] cipherTextBytes = memoryStream.ToArray();
        memoryStream.Close();
        cryptoStream.Close(); 
        string cipherText = Convert.ToBase64String(cipherTextBytes); 
        return cipherText;
    } 
    catch (Exception e){
        MessageBox.Show("Falsches Passwort "+ e.Message.ToString());
        string t = "";
        return t;
    }
}