ASP.NET

EnablePartialRendering="true"

suresh suthar wrote:

Controls are added on Button's click event (after page load).

MemoryStream ms = new MemoryStream();
Rijndael alg = Rijndael.Create();
System.Text.Encoding enc = System.Text.Encoding.ASCII;
byte[] input = enc.GetBytes(TextBox1.Text.ToString());
CryptoStream cs = new CryptoStream(ms, alg.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(input, 0, input.Length);
cs.Close();
byte[] encrypt = ms.ToArray();
TextBox2.Text = enc.GetString(encrypt);

MemoryStream ms = new MemoryStream();
Rijndael alg = Rijndael.Create();
System.Text.Encoding enc = System.Text.Encoding.ASCII;
byte[] input = enc.GetBytes(TextBox2.Text.ToString());
CryptoStream cs = new CryptoStream(ms, alg.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(input, 0, input.Length);
cs.Close();
byte[] decrypt = ms.ToArray();
TextBox3.Text = enc.GetString(decrypt);

public class Rijndael
{
    public static string Encrypt(string text, string key)
    {
        RijndaelManaged rijndael = new RijndaelManaged();

        byte[] plainText = System.Text.Encoding.Unicode.GetBytes(text);

        byte[] salt = Encoding.ASCII.GetBytes(key.Length.ToString());

        PasswordDeriveBytes secretKey = new PasswordDeriveBytes(key, salt);

        ICryptoTransform Encryptor = rijndael.CreateEncryptor(secretKey.GetBytes(32), secretKey.GetBytes(16));

        MemoryStream memoryStream = new MemoryStream();

        CryptoStream cryptoStream = new CryptoStream(memoryStream, Encryptor, CryptoStreamMode.Write);

        cryptoStream.Write(plainText, 0, plainText.Length);

        cryptoStream.FlushFinalBlock();

        byte[] cipherBytes = memoryStream.ToArray();

        memoryStream.Close();
        cryptoStream.Close();

        return Convert.ToBase64String(cipherBytes);
    }

    public static string Decrypt(string text, string key)
    {
        RijndaelManaged rijndael = new RijndaelManaged();

        byte[] encryptedText = Convert.FromBase64String(text);

        byte[] salt = Encoding.ASCII.GetBytes(key.Length.ToString());

        PasswordDeriveBytes secretKey = new PasswordDeriveBytes(key, salt);

        ICryptoTransform Decryptor = rijndael.CreateDecryptor(secretKey.GetBytes(32), secretKey.GetBytes(16));

        MemoryStream memoryStream = new MemoryStream(encryptedText);

        CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);

        byte[] plainText = new byte[encryptedText.Length];

        int DecryptedCount = cryptoStream.Read(plainText, 0, plainText.Length);

        memoryStream.Close();
        cryptoStream.Close();

        return Encoding.Unicode.GetString(plainText, 0, DecryptedCount);
    }
}

TextBox2.Text = Rijndael.Encrypt(TextBox1.Text, "SecurityKey");
TextBox3.Text = Rijndael.Decrypt(TextBox2.Text, "SecurityKey");