Encryption and decryption of URL parameters in asp.net

Encryption and decryption of URL parameters in asp.net

 

 

Encryption Code

  public static string Encode(string str, string key)　　         {　　             DESCryptoServiceProvider provider = new DESCryptoServiceProvider();　　             provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));　　            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));　　             byte[] bytes = Encoding.UTF8.GetBytes(str);　　             MemoryStream stream = new MemoryStream();　　            CryptoStream stream2 = new CryptoStream(stream, provider.CreateEncryptor(), CryptoStreamMode.Write);　　             stream2.Write(bytes, 0, bytes.Length);　　             stream2.FlushFinalBlock();　　             StringBuilder builder = new StringBuilder();　　             foreach (byte num in stream.ToArray())　　             {　　                 builder.AppendFormat("{0:X2}", num);　　             }　　             stream.Close();　　             return builder.ToString();　　         }

 

Decryption code

public static string Decode(string str, string key)　　         {　　             DESCryptoServiceProvider provider = new DESCryptoServiceProvider();　　             provider.Key = Encoding.ASCII.GetBytes(key.Substring(0, 8));　　            provider.IV = Encoding.ASCII.GetBytes(key.Substring(0, 8));　　             byte[] buffer = new byte[str.Length / 2];　　             for (int i = 0; i < (str.Length / 2); i++)　　             {　　                 int num2 = Convert.ToInt32(str.Substring(i * 2, 2), 0x10);　　                 buffer[i] = (byte)num2;　　             }　　             MemoryStream stream = new MemoryStream();　　             CryptoStream stream2 = new CryptoStream(stream, provider.CreateDecryptor(), CryptoStreamMode.Write);　　             stream2.Write(buffer, 0, buffer.Length);　　             stream2.FlushFinalBlock();　　             stream.Close();　　             return Encoding.GetEncoding("GB2312").GetString(stream.ToArray());　　         }

 

Front-end

<Asp: TextBox ID = "txtbox" runat = "server"> </asp: TextBox> <asp: button ID = "btnok" runat = "server" onclick = "btnok_Click" Text = "encrypted"/> <asp: button ID = "btncanel" runat = "server" Text = "decrypt" onclick = "btncanel_Click"/>

 

Background code

　　

  protected void btnok_Click(object sender, EventArgs e)　　         {　　             txtbox.Text = Helper.Encode(txtbox.Text.Trim(), "Rainight").Trim(　　         }　　　　         protected void btncanel_Click(object sender, EventArgs e)　　         {　　             txtbox.Text = Helper.Decode(txtbox.Text.Trim(), "Rainight").Trim();　　             Response.Write(Helper.Decode(txtbox.Text.Trim(), "Rainight"));　　         }