web Service加密处理

using System;
using System.Data;
using System.Configuration;
using System.Runtime.InteropServices;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.Services;

using System.Web.Services.Protocols;

/// <summary>
///klmywgSoapHeader 的摘要说明
/// </summary>
public class klmywgSoapHeader:SoapHeader
{
    public string UserName;
    public string PassWord;
    private string m_UserName;
    private string m_PassWord;

    [DllImport("DataEncrypt.dll")]
    public static extern string DESEncrypt(string Value, string Key);

    [DllImport("DataEncrypt.dll")]
    public static extern string DESUnEncrypt(string Value, string Key);
    string key;

    public klmywgSoapHeader()
    {

        key = ConfigurationManager.AppSettings["key"].ToString();
        m_UserName = ConfigurationManager.AppSettings["WebServiceUsername"].ToString();
        m_PassWord = ConfigurationManager.AppSettings["WebServicePassword"].ToString();
        m_PassWord = DESUnEncrypt(m_PassWord, key);

        
    }
    public string Validate()
    {
        PassWord = DESUnEncrypt(PassWord,key);
        if (m_UserName == UserName && m_PassWord == PassWord)
        {
            return "true";
        }
        else
        {
            return "do not have permission";
        }
    }

}

using System;

using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;


[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
// [System.Web.Script.Services.ScriptService]
public class Service : System.Web.Services.WebService
{
    public klmywgSoapHeader header = new klmywgSoapHeader();
    public Service () {

        //如果使用设计的组件，请取消注释以下行 
        //InitializeComponent(); 
    }

    [WebMethod]
    [SoapHeader("header")]
    public string HelloWorld() {
       string result= header.Validate();
       if (result == "true")
       {
           return "Hello World";
       }
       else
           return result;
    }
    
}

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class _Default : System.Web.UI.Page 
{
    localhost.klmywgSoapHeader header = new localhost.klmywgSoapHeader();
    localhost.Service service = new localhost.Service();    

    protected void Page_Load(object sender, EventArgs e)
    {
        header.UserName = ConfigurationSettings.AppSettings["WebServiceUsername"].ToString();
        header.PassWord = ConfigurationSettings.AppSettings["WebServicePassword"].ToString();

        service.klmywgSoapHeaderValue = header;
        string result = service.HelloWorld();
        Response.Write(result);
    }
}