客户端代码

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Security;

using System.Security.Cryptography;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

using demo;

public partial class _Default : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

    }

    protected void Button1_Click(object sender, EventArgs e)

    {

        demo.Service aa = new Service();

        string info = this.TextBox1.Text;

        demo.UserInfo uu = aa.getSOAPHeader();

        System.Security.Cryptography.CspParameters param = new CspParameters();

        param.Flags = CspProviderFlags.UseMachineKeyStore;

        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider(param);

        rsa.FromXmlString(uu.RSAPublicKey);

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        des.GenerateKey();

        uu.DESKey = rsa.Encrypt(des.Key, false);

        des.GenerateIV();

        uu.DESIV = rsa.Encrypt(des.IV, false);

        ICryptoTransform ict = des.CreateEncryptor();

        System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();

        byte[] input = ascii.GetBytes(info);

        uu.name = ict.TransformFinalBlock(input, 0, input.GetLength(0));

        info = aa.getUserInfo(uu);

        this.Label1.Text = info;

    }

}

Web服务端代码

//SOAP头信息

using System;

using System.Data;

using System.Configuration;

using System.Web;

using System.Security.Cryptography;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

using System.Web.UI.WebControls.WebParts;

using System.Web.UI.HtmlControls;

/// <summary>

/// UserInfo 的摘要说明

/// </summary>

public class UserInfo : System.Web.Services.Protocols.SoapHeader

{

    public byte[] name;

    public string RSAPublicKey;

    public byte[] DESKey;

    public byte[] DESIV;

    public UserInfo()

    {

        //name = "";

     }

}

//web服务

using System;

using System.Web;

using System.Security.Cryptography;

using System.Web.Services;

using System.Web.Services.Protocols;

[WebService(Namespace = "http://tempuri.org/")]

[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

public class Service : System.Web.Services.WebService

{

    public UserInfo uinfo ;

    public Service()

    {

        RSACryptoServiceProvider rsa=new RSACryptoServiceProvider();

        uinfo = new UserInfo();

        uinfo.RSAPublicKey = rsa.ToXmlString(true);

    }

    [SoapHeader("uinfo")]

    [WebMethod]

    public string getUserInfo(UserInfo uinfo)

    {

        RSACryptoServiceProvider rsa= new RSACryptoServiceProvider();

        DESCryptoServiceProvider des = new DESCryptoServiceProvider();

        rsa.FromXmlString(uinfo.RSAPublicKey);

        byte[] _DESKey = rsa.Decrypt(uinfo.DESKey,false);

        byte[] _DESIV = rsa.Decrypt(uinfo.DESKey, false);

        des.Key = _DESKey;

        des.IV  = _DESIV;

        ICryptoTransform ict = des.CreateDecryptor();

        byte[] ret = ict.TransformFinalBlock(uinfo.name ,0,uinfo.name.Length);

        System.Text.ASCIIEncoding ascii = new System.Text.ASCIIEncoding();

        return ascii.GetString(ret,0,ret.Length);

    }

    [WebMethod]

    public UserInfo getSOAPHeader()

    {

        return uinfo;

    }

}