稳扎稳打Silverlight(22) - 2.0通信之调用WCF服务, 对传输信息做加密

作者：webabcd

介绍
Silverlight 2.0 调用 WCF 服务，对客户端与服务端传输的消息做加密
在 Visual Studio 2008 中使用"添加服务引用"会自动生成代理类。只支持BasicHttpBinding

在线DEMO
http://www.cnblogs.com/webabcd/archive/2008/10/09/1307486.html

示例
clientaccesspolicy.xml

<?xml version="1.0" encoding="utf-8" ?>

<access-policy>

<cross-domain-access>

<allow-from http-request-headers="*">

</allow-from>

<grant-to>

</grant-to>

</policy>

</cross-domain-access>

</access-policy>

<!--

System.Net 命名空间和 System.Net.Sockets 命名空间的跨域调用，需要在目标域的根目录下配置策略文件

Image 控件和 MediaElement 控件所访问的跨域地址，不受策略文件的限制

HTTP 调用仅支持 GET 和 POST ，只有 200（确定）和 404（未找到）状态代码可用

同域：同一子域、协议和端口。不符合以上任一条件则为跨域

Silverlight 与 HTTP/HTTPS 的所有通信均为异步

关于策略文件详见文档

-->

1、调用 WCF 服务
WCFService.cs（WCF 服务）

using System;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.ServiceModel.Activation;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

using System.IO;

/// <summary>

/// 提供 WCF 服务的类

/// </summary>

[ServiceContract]

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

public class WCFService

{

/// <summary>

/// 返回指定的 User 对象（用于演示 Silverlight 调用 WCF 服务）

/// </summary>

/// <param name="name">名字</param>

/// <returns></returns>

[OperationContract]

public User GetUser(string name)

{

return new User { Name = name, DayOfBirth = new DateTime(1980, 2, 14) };

}

WCF.xaml

<UserControl x:Class="Silverlight20.Communication.WCF"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

</StackPanel>

</UserControl>

WCF.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Silverlight20.WCFServiceReference;

using System.Threading;

using System.ServiceModel;

namespace Silverlight20.Communication

{

public partial class WCF : UserControl

{

SynchronizationContext _syncContext;

/// <summary>

/// 演示 Silverlight 调用 WCF 服务

/// </summary>

public WCF()

{

InitializeComponent();

// 代理的配置信息在配置文件中，UI线程上的异步调用

Demo();

// 代理的配置信息在程序中指定，UI线程上的异步调用

Demo2();

// 后台线程（非UI线程）上的异步调用）

Demo3();

}

void Demo()

{

* 服务名Client - 系统自动生成的代理类

* 方法名Completed - 调用指定的方法完成后所触发的事件

* 方法名Async(参数1, 参数2

, object 用户标识) - 异步调用指定的方法

* Abort() - 取消调用

WCFServiceClient client = new WCFServiceClient();

client.GetUserCompleted += new EventHandler<GetUserCompletedEventArgs>(client_GetUserCompleted);

client.GetUserAsync("webabcd");

}

void Demo2()

{

* 服务名Client - 其构造函数可以动态地指定代理的配置信息（Silverlight 2.0 调用 WCF 只支持 BasicHttpBinding）

WCFServiceClient client = new WCFServiceClient(new BasicHttpBinding(), new EndpointAddress("http://localhost:3036/WCFService.svc"));

client.GetUserCompleted += new EventHandler<GetUserCompletedEventArgs>(client_GetUserCompleted);

client.GetUserAsync("webabcd2");

}

void client_GetUserCompleted(object sender, GetUserCompletedEventArgs e)

{

* 方法名CompletedEventArgs.Error - 该异步操作期间是否发生了错误

* 方法名CompletedEventArgs.Result - 异步操作返回的结果。本例为 User 类型

* 方法名CompletedEventArgs.UserState - 用户标识

if (e.Error != null)

{

lblMsg.Text += e.Error.ToString() + "\r\n";

return;

}

if (e.Cancelled != true)

{

OutputResult(e.Result);

}

void Demo3()

{

// UI 线程

_syncContext = SynchronizationContext.Current;

* ChannelFactory<T>.CreateChannel() - 创建 T 类型的信道

* 服务名.Begin方法名() - 后台线程上异步调用指定方法（最后一个参数为代理对象）

WCFService client = new ChannelFactory<WCFService>(new BasicHttpBinding(), new EndpointAddress("http://localhost:3036/WCFService.svc")).CreateChannel();

client.BeginGetUser("webabcd3", new AsyncCallback(ResponseCallback), client);

}

private void ResponseCallback(IAsyncResult result)

{

WCFService client = result.AsyncState as WCFService;

// 服务名.End方法名() - 获取在后台线程（非UI线程）上异步调用的结果

User user = client.EndGetUser(result);

// 调用 UI 线程

_syncContext.Post(GetResponse, user);

}

private void GetResponse(object state)

{

OutputResult(state as User);

}

/// <summary>

/// 输出异步调用 WCF 服务的方法后返回的结果

/// </summary>

/// <param name="user"></param>

void OutputResult(User user)

{

lblMsg.Text += string.Format("姓名：{0}；生日：{1}\r\n",

user.Name,

user.DayOfBirth.ToString("yyyy-MM-dd"));

}

2、对客户端与服务端传输的消息做加密
WCFService.cs（WCF 服务）

using System;

using System.Linq;

using System.Runtime.Serialization;

using System.ServiceModel;

using System.ServiceModel.Activation;

using System.Collections.Generic;

using System.Text;

using System.Security.Cryptography;

using System.IO;

/// <summary>

/// 提供 WCF 服务的类

/// </summary>

[ServiceContract]

[AspNetCompatibilityRequirements(RequirementsMode = AspNetCompatibilityRequirementsMode.Allowed)]

public class WCFService

{

/// <summary>

/// 返回指定的 User 对象（用于演示传输信息的加密/解密）

/// </summary>

/// <param name="name"></param>

/// <returns></returns>

[OperationContract]

public User GetUserByCryptography(string name)

{

return new User { Name = Decrypt(name), DayOfBirth = new DateTime(1980, 2, 14) };

}

/// <summary>

/// 解密数据

/// </summary>

/// <param name="input">加密后的字符串</param>

/// <returns>加密前的字符串</returns>

public string Decrypt(string input)

{

// 盐值（与加密时设置的值一致）

string saltValue = "saltValue";

// 密码值（与加密时设置的值一致）

string pwdValue = "pwdValue";

byte[] encryptBytes = Convert.FromBase64String(input);

byte[] salt = Encoding.UTF8.GetBytes(saltValue);

AesManaged aes = new AesManaged();

Rfc2898DeriveBytes rfc = new Rfc2898DeriveBytes(pwdValue, salt);

aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;

aes.KeySize = aes.LegalKeySizes[0].MaxSize;

aes.Key = rfc.GetBytes(aes.KeySize / 8);

aes.IV = rfc.GetBytes(aes.BlockSize / 8);

// 用当前的 Key 属性和初始化向量 IV 创建对称解密器对象

ICryptoTransform decryptTransform = aes.CreateDecryptor();

// 解密后的输出流

MemoryStream decryptStream = new MemoryStream();

// 将解密后的目标流（decryptStream）与解密转换（decryptTransform）相连接

CryptoStream decryptor = new CryptoStream(decryptStream, decryptTransform, CryptoStreamMode.Write);

// 将一个字节序列写入当前 CryptoStream （完成解密的过程）

decryptor.Write(encryptBytes, 0, encryptBytes.Length);

decryptor.Close();

// 将解密后所得到的流转换为字符串

byte[] decryptBytes = decryptStream.ToArray();

string decryptedString = UTF8Encoding.UTF8.GetString(decryptBytes, 0, decryptBytes.Length);

return decryptedString;

}

Cryptography.xaml

<UserControl x:Class="Silverlight20.Communication.Cryptography"

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">

</StackPanel>

</UserControl>

Cryptography.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using Silverlight20.WCFServiceReference;

using System.Text;

using System.Security.Cryptography;

using System.IO;

namespace Silverlight20.Communication

{

public partial class Cryptography : UserControl

{

public Cryptography()

{

InitializeComponent();

Demo();

}

void Demo()

{

WCFServiceClient client = new WCFServiceClient();

client.GetUserByCryptographyCompleted+=new EventHandler<GetUserByCryptographyCompletedEventArgs>(client_GetUserByCryptographyCompleted);

client.GetUserByCryptographyAsync(Encrypt("webabcd"));

}

void client_GetUserByCryptographyCompleted(object sender, GetUserByCryptographyCompletedEventArgs e)

{

if (e.Error != null)

{

lblMsg.Text += e.Error.ToString() + "\r\n";

return;

}

if (e.Cancelled != true)

{

lblMsg.Text += string.Format("姓名：{0}；生日：{1}\r\n",

e.Result.Name,

e.Result.DayOfBirth.ToString("yyyy-MM-dd"));

}

/// <summary>

/// 加密数据

/// </summary>

/// <param name="input">加密前的字符串</param>

/// <returns>加密后的字符串</returns>

private string Encrypt(string input)

{

// 盐值

string saltValue = "saltValue";

// 密码值

string pwdValue = "pwdValue";

byte[] data = UTF8Encoding.UTF8.GetBytes(input);

byte[] salt = UTF8Encoding.UTF8.GetBytes(saltValue);

// AesManaged - 高级加密标准(AES) 对称算法的管理类

AesManaged aes = new AesManaged();

// Rfc2898DeriveBytes - 通过使用基于 HMACSHA1 的伪随机数生成器，实现基于密码的密钥派生功能 (PBKDF2 - 一种基于密码的密钥派生函数)

// 通过密码和 salt 派生密钥

Rfc2898DeriveBytes rfc = new Rfc2898DeriveBytes(pwdValue, salt);

* AesManaged.BlockSize - 加密操作的块大小（单位：bit）

* AesManaged.LegalBlockSizes - 对称算法支持的块大小（单位：bit）

* AesManaged.KeySize - 对称算法的密钥大小（单位：bit）

* AesManaged.LegalKeySizes - 对称算法支持的密钥大小（单位：bit）

* AesManaged.Key - 对称算法的密钥

* AesManaged.IV - 对称算法的密钥大小

* Rfc2898DeriveBytes.GetBytes(int 需要生成的伪随机密钥字节数) - 生成密钥

aes.BlockSize = aes.LegalBlockSizes[0].MaxSize;

aes.KeySize = aes.LegalKeySizes[0].MaxSize;

aes.Key = rfc.GetBytes(aes.KeySize / 8);

aes.IV = rfc.GetBytes(aes.BlockSize / 8);

// 用当前的 Key 属性和初始化向量 IV 创建对称加密器对象

ICryptoTransform encryptTransform = aes.CreateEncryptor();

// 加密后的输出流

MemoryStream encryptStream = new MemoryStream();

// 将加密后的目标流（encryptStream）与加密转换（encryptTransform）相连接

CryptoStream encryptor = new CryptoStream(encryptStream, encryptTransform, CryptoStreamMode.Write);

// 将一个字节序列写入当前 CryptoStream （完成加密的过程）

encryptor.Write(data, 0, data.Length);

encryptor.Close();

// 将加密后所得到的流转换成字节数组，再用Base64编码将其转换为字符串

string encryptedString = Convert.ToBase64String(encryptStream.ToArray());

return encryptedString;

}

OK
[源码下载]

posted @ 2008-12-15 08:17 webabcd 阅读(6170) 评论(11) 编辑收藏举报

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稳扎稳打Silverlight(22) - 2.0通信之调用WCF服务, 对传输信息做加密

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