使用SSL确保通信中的数据安全

        #region Server
        /// <summary>
        /// 用于保存非对称加密(数字证书)的公钥
        /// </summary>
        private string publicKey = string.Empty;
        /// <summary>
        /// 用于保存非对称加密(数字证书)的私钥
        /// </summary>
        private string pfxKey = string.Empty;

        ///===========================
        ///服务端代码
        ///===========================

        /// <summary>
        /// 用于跟客户端通信的Socket
        /// </summary>
        private Socket serverCommunicateSocket;
        /// <summary>
        /// 定义接收缓存块的大小
        /// </summary>
        private static int serverBufferSize = 1024;
        /// <summary>
        /// 缓存块
        /// </summary>
        byte[] bytesReceivedFromClient = new byte[serverBufferSize];
        /// <summary>
        /// 密钥K
        /// </summary>
        private string key = string.Empty;
        StringBuilder messageFromClient = new StringBuilder();

        /// <summary>
        /// 开启服务器
        /// </summary>
        private void btnStartServer_Click(object sender, EventArgs e)
        {
            //先生成数字证书(模拟，及非对称密钥对)
            RSAKeyInit();
            //负责侦听
            StartListen();
        }

        void RSAKeyInit()
        {
            RSAProcessor.CreateRSAKey(ref publicKey, ref pfxKey);

            //本例中，先指定一对公钥、私钥
            publicKey = "<RSAKeyValue><Modulus>httkQLJ52ODWcIoDont7izs0Kn8OIr3IJ+Q5DC3RgzojjphvHN/5N4miVN+U0fz405o53CRP0PUghyq0rbHZNj7ZW1M1Vh/ne4lDvP/q44QerhYewTUwT92tHj8GyYxvegkp98vT95YkjFJRByQCXrhKBW64ziqnDL2n9LeUPBM=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";
            pfxKey = "<RSAKeyValue><Modulus>httkQLJ52ODWcIoDont7izs0Kn8OIr3IJ+Q5DC3RgzojjphvHN/5N4miVN+U0fz405o53CRP0PUghyq0rbHZNj7ZW1M1Vh/ne4lDvP/q44QerhYewTUwT92tHj8GyYxvegkp98vT95YkjFJRByQCXrhKBW64ziqnDL2n9LeUPBM=</Modulus><Exponent>AQAB</Exponent><P>vZPGLPJBxtjhoSSt7OXvAqalRU8IXmPbojk7/j9f1DW1DRCLwof6MjJqt4uAY9D/L/GPJh9zIddeVM3lkr9s6Q==</P><Q>tht1LlLi7XQJHsVfgJ1ewBjjOOzQSfmO+RTClWXKquuup4pblF51jSDK+5VlyibD5chzeO1mxjvzkEfcJNgTmw==</Q><DP>kZXfdfrhKqy5sX+ylaAKydViTHSiL6KuM8mSWfEfTZ+lF5BiVBUKvevb6nKWOZFxt8bhMNysFQwI5EVujSC2qQ==</DP><DQ>hEsqM77vMEWNopcMLCkm/jKWT3JqVnM/lF+qhFHwi36v4PK4WO7OQvpBu8bqrZK/2ZxnlsAQW46OAJDTsshuZQ==</DQ><InverseQ>BfZy74k5EqN6l7faYHSYvqWuRMSWwp4dCXF43uT8wcf3kciYxIkbaNNY56ulJbCAN2SyDQkD3PF+Sp3qtJZ/Vg==</InverseQ><D>ADbI6fFekCGLNZKCfveDMq1dX9PjydpTPvz1ujc4ZeTpuYg0ZO9WDeiCAXB5Y/vqySstfFPybHp3Gr/OmZf2qEbKQlK6Ztms3R30rnqk/2/XHtAm5AeVLhf03q/+76mtvgtUTspgth55JpIKGYNKcQTJBbgepbyVT26YjMwrMoE=</D></RSAKeyValue>";
        }

        void StartListen()
        {
            IPEndPoint iep = new IPEndPoint(IPAddress.Parse("192.168.1.103"), 8009);
            //负责侦听的socket
            Socket listenSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            listenSocket.Bind(iep);
            listenSocket.Listen(50);
            listenSocket.BeginAccept(new AsyncCallback(this.Accepted), listenSocket);
            ListBoxShow("开始侦听...");
            btnStartServer.Enabled = false;
        }

        /// <summary>
        /// 负责客户端的连接，并开始将自己置于接收状态
        /// </summary>
        void Accepted(IAsyncResult result)
        {
            Socket listenSocket = result.AsyncState as Socket;

            //初始化和客户端进行通信的socket
            serverCommunicateSocket = listenSocket.EndAccept(result);
            ListBoxShow("有客户端连接到...");
            serverCommunicateSocket.BeginReceive(bytesReceivedFromClient, 0, serverBufferSize, SocketFlags.None,
                new AsyncCallback(this.ReceivedFromClient), null);
        }

        /// <summary>
        /// 负责处理接收自客户端的数据
        /// </summary>
        void ReceivedFromClient(IAsyncResult result)
        {
            int read = serverCommunicateSocket.EndReceive(result);
            if (read > 0)
            {
                messageFromClient.Append(UTF32Encoding.Default.GetString(bytesReceivedFromClient, 0, read));
                //处理并显示数据
                ProcessAndShowInServer();
                serverCommunicateSocket.BeginReceive(bytesReceivedFromClient, 0, serverBufferSize, 0,
                    new AsyncCallback(ReceivedFromClient), null);
            }
        }

        private void ProcessAndShowInServer()
        {
            string msg = messageFromClient.ToString();
            //如果接收到<EOF>表示完成一次，否则继续将自己置于接收状态
            if (msg.IndexOf("<EOF>") > -1)
            {
                //如果客户端发送Key,则负责初始化Key
                if (msg.IndexOf("<KEY>") > -1)
                {
                    //用私钥解密发送过来的Key信息
                    key = RSAProcessor.RSADecrypt(pfxKey, msg.Substring(0, msg.Length - 10));
                    ListBoxShow(string.Format("接收到客户端密钥：{0}", key));
                }
                else
                {
                    //解密SSL通道中发送过来的密文并显示
                    ListBoxShow(string.Format("接收到客户端消息：{0}", RijndaelProcessor.DecryptString(msg.Substring(0, msg.Length - 5), key)));
                }
            }
            messageFromClient.Clear();
        }

        /// <summary>
        /// 负责向客户端发送数据
        /// </summary>
        private void btnStartSendToClient_Click(object sender, EventArgs e)
        {
            //加密消息体
            string msg = string.Format("{0}{1}", RijndaelProcessor.EncryptString(DateTime.Now.ToString(), key), "<EOF>");
            RijndaelProcessor.DecryptString(msg.Substring(0, msg.Length - 5), key);
            byte[] msgBytes = UTF32Encoding.Default.GetBytes(msg);
            serverCommunicateSocket.BeginSend(msgBytes, 0, msgBytes.Length, SocketFlags.None, null, null);
            ListBoxShow(string.Format("发送:{0}", msg));
        }

        /// <summary>
        /// 界面显示
        /// </summary>
        private void ListBoxShow(string argMsg)
        {
            listBoxServer.BeginInvoke(new Action(() =>
            {
                listBoxServer.Items.Add(argMsg);
            }));
        }
        #endregion

        #region Client

        /// <summary>
        /// 用于保存非对称加密(数字证书)的公钥
        /// </summary>
        private string publicKey = "<RSAKeyValue><Modulus>httkQLJ52ODWcIoDont7izs0Kn8OIr3IJ+Q5DC3RgzojjphvHN/5N4miVN+U0fz405o53CRP0PUghyq0rbHZNj7ZW1M1Vh/ne4lDvP/q44QerhYewTUwT92tHj8GyYxvegkp98vT95YkjFJRByQCXrhKBW64ziqnDL2n9LeUPBM=</Modulus><Exponent>AQAB</Exponent></RSAKeyValue>";


        ///==============================
        /// 客户端代码
        ///==============================

        ///用于跟踪服务器通信的socket
        private Socket clientCommunicateSocket;
        /// <summary>
        /// 用于暂存接收到的字符串
        /// </summary>
        StringBuilder messageFromServer = new StringBuilder();
        /// <summary>
        /// 定义接收存储块的大小
        /// </summary>
        private static int clientBufferSize = 1024;
        /// <summary>
        /// 缓存块
        /// </summary>
        byte[] bytesReceivedFromServer = new byte[clientBufferSize];

        /// <summary>
        /// 随机生产的key,在这里硬编码为"key123"
        /// </summary>
        private string keyCreateRandom = "key123";
        //Guid.NewGuid().ToString().ToUpper().Replace("-", "") +Guid.NewGuid().ToString().ToUpper().Replace("-", ""); 

        private void btnConnectToServer_Click(object sender, EventArgs e)
        {
            IPEndPoint iep = new IPEndPoint(IPAddress.Parse("192.168.1.103"), 8009);
            Socket connectSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            connectSocket.BeginConnect(iep, new AsyncCallback(this.Connected), connectSocket);
            btnConnectToServer.Enabled = false;
        }

        void Connected(IAsyncResult result)
        {
            clientCommunicateSocket = result.AsyncState as Socket;
            clientCommunicateSocket.EndConnect(result);
            clientCommunicateSocket.BeginReceive(bytesReceivedFromServer, 0, clientBufferSize, SocketFlags.None,
                new AsyncCallback(this.ReceivedFromServer), null);
            ListBoxClientShow("客户端连接上服务器...");
            //连接成功便发送密钥K给服务器
            SendKey();
        }

        void ReceivedFromServer(IAsyncResult result)
        {
            int read = clientCommunicateSocket.EndReceive(result);
            if (read > 0)
            {
                messageFromServer.Append(UTF32Encoding.Default.GetString(bytesReceivedFromServer, 0, read));
                //处理并显示客户端数据
                ProcessAndShowInClient();
                clientCommunicateSocket.BeginReceive(bytesReceivedFromServer, 0, clientBufferSize, 0,
                    new AsyncCallback(ReceivedFromServer), null);
            }
        }

        void ProcessAndShowInClient()
        {
            //如果接收到<EOF>表示完成一次接收，否则继续将自己置于接收状态
            if (messageFromServer.ToString().IndexOf("<EOF>") > -1)
            {
                //解密消息体并呈现出来
                ListBoxClientShow(string.Format("接收到服务器消息：{0}",
                    RijndaelProcessor.DecryptString(
                    messageFromServer.ToString().Substring(0, messageFromServer.ToString().Length - 5)
                    , keyCreateRandom)));
                messageFromServer.Clear();
            }
        }

        private void btnStartSendToServer_Click(object sender, EventArgs e)
        {
            //加密消息体
            string msg = string.Format("{0}{1}",
                RijndaelProcessor.EncryptString(DateTime.Now.ToString(), keyCreateRandom), "<EOF>");
            byte[] msgBytes = UTF32Encoding.Default.GetBytes(msg);
            clientCommunicateSocket.BeginSend(msgBytes, 0, msgBytes.Length, SocketFlags.None, null, null);
            ListBoxClientShow(string.Format("发送:{0}", msg));
        }

        void SendKey()
        {
            string msg = RSAProcessor.RSAEncrypt(publicKey, keyCreateRandom) + "<KEY><EOF>";
            byte[] msgBytes = UTF32Encoding.Default.GetBytes(msg);
            clientCommunicateSocket.BeginSend(msgBytes, 0, msgBytes.Length, SocketFlags.None, null, null);
            ListBoxClientShow(string.Format("发送：{0}", keyCreateRandom));
        }

        void ListBoxClientShow(string argMsg)
        {
            listBoxClient.BeginInvoke(new Action(() =>
            {
                listBoxClient.Items.Add(argMsg);
            }));
        }

        #endregion

using System; 
using System.IO; 
using System.Security.Cryptography;
using System.Text;

namespace LibAlgorithm
{
    /// <summary>
    /// Rijndael对称加密算法
    /// </summary>
    public class RijndaelProcessor
    {
        /// <summary>
        /// 缓冲区大小
        /// </summary>
        private static int bufferSize = 128 * 1024;

        /// <summary>
        /// 密钥salt
        /// </summary>
        private static byte[] salt = { 134, 216, 7, 36, 88, 164, 91, 227, 174, 76, 191, 197, 192, 154, 200, 248 };
        //salt用来防止穷举暴力破解(salt是在密钥导出之前在密码末尾引入的随机字节，它使得这类攻击变得非常困难)

        /// <summary>
        /// 初始化向量
        /// </summary>
        private static  byte[] iv = { 134, 216, 7, 36, 88, 164, 91, 227, 174, 76, 191, 197, 192, 154, 200, 248 };
        //初始化向量iv起到的也是增强破解难度的作用

        /// <summary>
        /// 初始化 并返回对称加密算法
        /// </summary>
        /// <param name="argKey"></param>
        /// <param name="argSalt"></param>
        /// <returns></returns>
        private static SymmetricAlgorithm CreateRijindael(string argKey, byte[] argSalt)
        {
            PasswordDeriveBytes pdb = new PasswordDeriveBytes(argKey, argSalt, "SHA256", 1000);
            SymmetricAlgorithm sma = Rijndael.Create();
            sma.KeySize = 256;
            sma.Key = pdb.GetBytes(32);
            sma.Padding = PaddingMode.PKCS7;
            return sma;
        }

        public static string EncryptString(string argInput, string argKey)
        {
            using (MemoryStream memoryStream = new MemoryStream())
            using (SymmetricAlgorithm algorithm = CreateRijindael(argKey, salt))
            {
                algorithm.IV = iv;
                using (CryptoStream cryptoStream = new CryptoStream(memoryStream, algorithm.CreateEncryptor(),
                        CryptoStreamMode.Write))
                {
                    byte[] bytes = UTF32Encoding.Default.GetBytes(argInput);
                    cryptoStream.Write(bytes, 0, bytes.Length);
                    cryptoStream.Flush();
                }
                return Convert.ToBase64String(memoryStream.ToArray());
            }
        }

        public static string DecryptString(string argInput, string argKey)
        {
            using (MemoryStream inputMemoryStream = new MemoryStream(Convert.FromBase64String(argInput)))
            using (SymmetricAlgorithm algorithm = CreateRijindael(argKey, salt))
            {
                algorithm.IV = iv;
                using (CryptoStream cryptoStream = new CryptoStream(inputMemoryStream, algorithm.CreateDecryptor(),
                        CryptoStreamMode.Read))
                {
                    StreamReader sr = new StreamReader(cryptoStream);
                    return sr.ReadToEnd();
                }
            }
        }

    }
}

using System;
using System.Collections.Generic; 
using System.Security.Cryptography;
using System.Text;

namespace LibAlgorithm
{
    /// <summary>
    /// RSA非对称加密
    /// </summary>
    public class RSAProcessor
    {
        public static void CreateRSAKey(ref string publicKey, ref string pfxKey)
        {
            RSACryptoServiceProvider provider = new RSACryptoServiceProvider();
            pfxKey = provider.ToXmlString(true);
            publicKey = provider.ToXmlString(false);
        }

        public static string RSAEncrypt(string argXmlPublicKey, string argEncryptString)
        {
            byte[] btEncryptedSecret = Encoding.UTF8.GetBytes(argEncryptString);
            btEncryptedSecret = CRSAWrap.EncryptBuffer(argXmlPublicKey, btEncryptedSecret);
            return Convert.ToBase64String(btEncryptedSecret);
        }

        public static string RSADecrypt(string xmlPrivateKey, string argDecryptString)
        {
            byte[] btDecryptedSecred = Convert.FromBase64String(argDecryptString);
            btDecryptedSecred = CRSAWrap.DecryptBuffer(xmlPrivateKey,btDecryptedSecred);
            return Encoding.UTF8.GetString(btDecryptedSecred);
        }
    }

    class CRSAWrap
    {
        public static byte[] EncryptBuffer(string rsaKeyString, byte[] btSecret)
        {
            int keySize = 0;
            int blockSize = 0;
            int counter = 0;
            int iterations = 0;
            int index = 0;
            byte[] btPlaintextToken;
            byte[] btEncryptedToken;
            byte[] btEncryptedSecret;
            RSACryptoServiceProvider rsaSender = new RSACryptoServiceProvider();
            rsaSender.FromXmlString(rsaKeyString);
            keySize = rsaSender.KeySize / 8;
            blockSize = keySize - 11;

            if ((btSecret.Length % blockSize) != 0)
            {
                iterations = btSecret.Length / blockSize + 1;
            }
            else
            {
                iterations = btSecret.Length / blockSize;
            }
            btPlaintextToken = new byte[blockSize];
            btEncryptedSecret = new byte[iterations * keySize];
            for (index = 0, counter = 0; counter < iterations; counter++,index += blockSize)
            {
                if (counter == (iterations - 1))
                {
                    int lastblockSize = btSecret.Length % blockSize;
                    btPlaintextToken = new byte[lastblockSize];
                    Array.Copy(btSecret, index, btPlaintextToken, 0, lastblockSize);
                }
                else
                {
                    Array.Copy(btSecret, index, btPlaintextToken, 0, blockSize);
                }
                btEncryptedToken = rsaSender.Encrypt(btPlaintextToken, false);
                Array.Copy(btEncryptedToken, 0, btEncryptedSecret, counter * keySize, keySize);
            }
            return btEncryptedSecret;
        }

        public static byte[] DecryptBuffer(string argRsaKeyString, byte[] btEncryptedSecret)
        {
            int keySize = 0;
            int blockSize = 0;
            int counter = 0;
            int iterations = 0;
            int index = 0;
            int byteCount = 0;
            byte[] btPlaintextToken;
            byte[] btEncryptedToken;
            byte[] btDecryptedSecret;
            RSACryptoServiceProvider rsaReceiver=new RSACryptoServiceProvider();
            rsaReceiver.FromXmlString(argRsaKeyString);
            keySize = rsaReceiver.KeySize/8;
            blockSize = keySize - 11;
            if ((btEncryptedSecret.Length%keySize) != 0)
            {
                return null;
            }
            iterations = btEncryptedSecret.Length/keySize;
            btEncryptedToken=new byte[keySize];
            Queue<byte[]> tokenQueue=new Queue<byte[]>();
            for (index = 0,counter = 0; counter < iterations; index += blockSize,counter++)
            {
                Array.Copy(btEncryptedSecret,counter*keySize,btEncryptedToken,0,keySize);
                btPlaintextToken = rsaReceiver.Decrypt(btEncryptedToken, false);
                tokenQueue.Enqueue(btPlaintextToken);
            }
            byteCount = 0;
            foreach (var plainTextToken in tokenQueue)
            {
                byteCount += plainTextToken.Length;
            }
            counter = 0;
            btDecryptedSecret=new byte[byteCount];
            foreach (var plainTextToken in tokenQueue)
            {
                if (counter==(iterations-1))
                {
                    Array.Copy(plainTextToken,0,btDecryptedSecret,btDecryptedSecret.Length-plainTextToken.Length,plainTextToken.Length);
                }
                else
                {
                    Array.Copy(plainTextToken,0,btDecryptedSecret,counter*blockSize,blockSize);
                }
                counter++;
            }
            return btDecryptedSecret;
        }
    }
}

源码下载地址：Test117_使用SSL确保通信中的数据安全.rar