세우세상 -> 이전 : http://doldolcoding.tistory.com/

// 초기화

private void DesCryptoDemo_Load(object sender, EventArgs e)

        {

            textBox1.Text = "가나다라마바사아자차카타파하";

            textBox1.Text += "\r\n1234567890";

            textBox1.Text += "\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ";

            textBox1.Text += "\r\nabcdefghijklmnopqrstuvwxyz";

            txtKey.Text = "12345678";//필히 8자리

            txtIV.Text = "12345678";//필히 8자리

        }

//암호화

        private void button1_Click(object sender, EventArgs e)

        {                  

            DESCryptoServiceProvider DesKey = new DESCryptoServiceProvider();

            DesKey.Key = Encoding.Default.GetBytes(txtKey.Text);

            DesKey.IV = Encoding.Default.GetBytes(txtIV.Text);

            MemoryStream ms = new MemoryStream();

            CryptoStream encStream = new CryptoStream(ms, DesKey.CreateEncryptor(), CryptoStreamMode.Write);

            StreamWriter sw = new StreamWriter(encStream);

            sw.Write(textBox1.Text);

            sw.Close();

            encStream.Close();

            textBox2.Text = Convert.ToBase64String(ms.ToArray());

            ms.Close();

        }

//복호화 

        private void btn복호화_Click(object sender, EventArgs e)

        {

            DESCryptoServiceProvider DesKey = new DESCryptoServiceProvider();

            DesKey.Key = Encoding.Default.GetBytes(txtKey.Text);

            DesKey.IV = Encoding.Default.GetBytes(txtIV.Text);

            byte[] buffer = Convert.FromBase64String(textBox2.Text);

            MemoryStream ms = new MemoryStream(buffer);

            ICryptoTransform ct = DesKey.CreateDecryptor();

            CryptoStream encStream = new CryptoStream(ms, ct, CryptoStreamMode.Read);

            StreamReader sr = new StreamReader(encStream);

            textBox3.Text = sr.ReadToEnd();

            sr.Close();

            encStream.Close();

            ms.Close();

        }