asp.net中URL參數加密解密過程

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asp.net中URL參數加密解密過程  

 

  

 

加密代碼

      

  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();           }

 

  解密代碼

   

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());           }

 

  前台

<asp:TextBox ID="txtbox" runat="server"></asp:TextBox>  <asp:Button ID="btnok" runat="server" onclick="btnok_Click" Text="加密" />  <asp:Button ID="btncanel" runat="server" Text="解密" onclick="btncanel_Click" />

 

    後台代碼

  

  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"));           }

 

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