//构造发送RN的报文
/// <summary>
/// 产生一个随机数RN，并将RN和CA，CB一起发给A和B。
///KDCA: Dp(Ep(<CA,CB,RN,T1>，KeA),KdKDC)
///KDCB: Dp(Ep(<CA,CB,RN,T1>，KeB),KdKDC)
/// </summary>
/// <param name="comClientGroup"></param>
/// <returns></returns>
private string[] createStrSendRN(ComClientGroup comClientGroup)
{
//str=username1+"c"+username2+"c"+RN+"c"+ticks;
string[] rsaStr = new string[2];
string str = comClientGroup.CerClient1.Username + "c" + comClientGroup.CerClient2.Username + "c" + comClientGroup.Rn + "c" + TimeUtil.getTicks();
rsaStr[0] = this.rsaEnByKe(str, comClientGroup.CerClient1).Replace('$', 'd');
rsaStr[1] = this.rsaEnByKe(str, comClientGroup.CerClient2).Replace('$', 'd');
return(rsaStr);
}
//检测该通信组是否已近存在
private bool isExistComClientGroup(ComClientGroup comClientGroup)
{
for (int i = 0; i < comClientGroups.Count; i++)
{
if (((ComClientGroup)comClientGroups[i]).ToString() == comClientGroup.ToString())
{
return(true);
}
}
return(false);
}
private void ReceiveData()
{
UdpClient udpClient = new UdpClient(int.Parse(serverPort));
//远程主机节点
IPEndPoint remote = null;
//返回的报文
string backMsg = string.Empty;
//接收从远程主机发送过来的信息
while (true)
{
//关闭udpClient时此句会产生异常
//此句阻塞
byte[] bytes = udpClient.Receive(ref remote);
string recStr = aes.AesDecipher(Encoding.UTF8.GetString(bytes, 0, bytes.Length)).Trim();
// this.txtComInfo.AppendText("\r\n" + recStr);
// this.txtComInfo.AppendText("\r\n" + string.Format("来自{0}：{1}", remote, recStr));
//必须加这句，原因未知。
Thread.Sleep(100);
string[] recStrArr = recStr.Split('|');
//连接
if (recStrArr[0] == "1")
{
sendMessage(aes.AesEncipher("1" + "|" + recStrArr[3].ToUpper()), IPAddress.Parse(recStrArr[1]), int.Parse(recStrArr[2]));
this.txtComInfo.AppendText("\r\n处理来自" + remote + "的连接请求。");
}
//注册
if (recStrArr[0] == "2")
{
string username = rsa.Decryption(recStrArr[3], KDCp, KDCq, KDCd);
RegClient regClient = new RegClient(username);
//检查是否已经注册此用户
//标志
int flag = 0;
for (int i = 0; i < regClients.Count; i++)
{
if (regClient.Username == ((RegClient)regClients[i]).Username)
{
flag = 1;
}
}
this.txtComInfo.AppendText("\r\n处理来自" + username + "的注册请求。");
//用户未注册
if (0 == flag)
{
regClients.Add(regClient);
backMsg = rsa.Encryption(username, KDCp, KDCq, KDCd);
sendMessage(aes.AesEncipher("2|" + backMsg), regClient.ClientIP, regClient.ClientPort);
}
if (1 == flag)
{
//用户已经注册
backMsg = rsa.Encryption("exist", KDCp, KDCq, KDCd);
sendMessage(aes.AesEncipher("2|" + backMsg), regClient.ClientIP, regClient.ClientPort);
}
}
//获取证书
if ("3" == recStrArr[0])
{
//解密出请求报文
string cer = rsaDeByKd(recStrArr[3]);
string[] cerArr = cer.Split('c');
string username = cerArr[0];
string cerKe = cerArr[1];
string cerTick = cerArr[2];
this.txtComInfo.AppendText("\r\n处理来自" + username + "的获取会话证书请求。");
this.txtComInfo.AppendText("\r\n用户名：" + username);
this.txtComInfo.AppendText("\r\n用户公钥：" + cerKe);
this.txtComInfo.AppendText("\r\n时间戳：" + cerTick);
CerClient cerClient = new CerClient(username, cerKe, cerTick);
//检测该用户是否已经取得证书
//标志
int flag = 0;
for (int i = 0; i < cerClients.Count; i++)
{
if (cerClient.Username == ((CerClient)cerClients[i]).Username)
{
flag = 1;
}
}
//用户未取得证书
if (0 == flag)
{
//KDC-->A: Dp(CA,KdKDC)
backMsg = rsaEnByKd(username + "c" + cerKe);
sendMessage(aes.AesEncipher("3|" + backMsg), cerClient.ClientIP, cerClient.ClientPort);
cerClients.Add(cerClient);
//广播当前获得证书的用户
Thread th = new Thread(broadcastCerClients);
th.Start();
this.lbxCerClient.Items.Clear();
//页面显示
for (int i = 0; i < cerClients.Count; i++)
{
this.lbxCerClient.Items.Add(cerClients[i]);
}
}
if (1 == flag)
{
//用户已经取得证书
backMsg = rsa.Encryption("exist", KDCp, KDCq, KDCd);
sendMessage(aes.AesEncipher("3|" + backMsg), cerClient.ClientIP, cerClient.ClientPort);
}
}
//申请会话
if ("5" == recStrArr[0])
{
string str = rsaDeByKd(recStrArr[1]);
string username1 = str.Split('c')[0];
string username2 = str.Split('c')[1];
CerClient c1 = null;
CerClient c2 = null;
for (int i = 0; i < cerClients.Count; i++)
{
if (username1 == ((CerClient)cerClients[i]).Username)
{
c1 = (CerClient)cerClients[i];
break;
}
}
for (int i = 0; i < cerClients.Count; i++)
{
if (username2 == ((CerClient)cerClients[i]).Username)
{
c2 = (CerClient)cerClients[i];
break;
}
}
ComClientGroup comClientGroup = new ComClientGroup(c1, c2);
this.txtComInfo.AppendText("\r\n处理来自" + username1 + "的会话请求。");
this.txtComInfo.AppendText("\r\n<--" + comClientGroup.ToString() + "-->");
if (isExistComClientGroup(comClientGroup))
{
//通信组已近存在
//MessageBox.Show("存在");
backMsg = rsa.Encryption("exist", KDCp, KDCq, KDCd);
sendMessage(aes.AesEncipher("5|" + backMsg), c1.ClientIP, c1.ClientPort);
}
else
{
//尚未存在
this.comClientGroups.Add(comClientGroup);
//this.txtComInfo.AppendText("\r\n--------\r\n" + createStrSendRN(comClientGroup)[0]);
string str1 = rsaEnByKd(createStrSendRN(comClientGroup)[0]);
string str2 = rsaEnByKd(createStrSendRN(comClientGroup)[1]);
//this.txtComInfo.AppendText("\r\n--------\r\n" + str1);
//this.txtComInfo.AppendText("\r\n--------\r\n" + str2);
sendMessage(aes.AesEncipher("5|" + str1), c1.ClientIP, c1.ClientPort);
sendMessage(aes.AesEncipher("5|" + str2), c2.ClientIP, c2.ClientPort);
//页面显示
this.lbxComClient.Items.Clear();
for (int i = 0; i < comClientGroups.Count; i++)
{
this.lbxComClient.Items.Add((ComClientGroup)comClientGroups[i]);
}
}
}
//取消会话
if ("6" == recStrArr[0])
{
this.txtComInfo.AppendText("\r\n取消通信组：" + recStrArr[1]);
int i = 0;
for (i = 0; i < comClientGroups.Count; i++)
{
if (((ComClientGroup)comClientGroups[i]).ToString() == recStrArr[1])
{
break;
}
}
if (i >= comClientGroups.Count)
{
//已经取消通信
}
else
{
//移除该通信组
CerClient c1 = ((ComClientGroup)comClientGroups[i]).CerClient1;
CerClient c2 = ((ComClientGroup)comClientGroups[i]).CerClient2;
//发送通知
sendMessage(aes.AesEncipher("6|" + c2.Username), c1.ClientIP, c1.ClientPort);
sendMessage(aes.AesEncipher("6|" + c1.Username), c2.ClientIP, c2.ClientPort);
//刷新界面
comClientGroups.RemoveAt(i);
//页面显示
this.lbxComClient.Items.Clear();
for (int j = 0; j < comClientGroups.Count; j++)
{
this.lbxComClient.Items.Add((ComClientGroup)comClientGroups[j]);
}
}
}
//转发通信消息
if ("7" == recStrArr[0])
{
//this.txtComInfo.AppendText("\r\n收到转发通信消息报文：" + recStr);
//构造比较字符串
string str1 = null;
string username1 = recStrArr[1]; //源地址
string username2 = recStrArr[2]; //目的地址
//目的地址
CerClient cd = new CerClient(username2, "", "");
//源地址
CerClient cs = new CerClient(username1, "", "");
if (username1.CompareTo(username2) > 0)
{
str1 = username1 + "," + username2;
}
else
{
str1 = username2 + "," + username1;
}
int i = 0;
for (i = 0; i < comClientGroups.Count; i++)
{
if (((ComClientGroup)comClientGroups[i]).ToString() == str1)
{
break;
}
}
if (i >= comClientGroups.Count)
{
//不存在此通信组，返回消息发送失败
}
else
{
//向目的地址发送消息报文
ComClientGroup comClientGroup = ((ComClientGroup)comClientGroups[i]);
string repMsg = "7|" + cs.Username + "|" + recStrArr[3];
sendMessage(aes.AesEncipher(repMsg), cd.ClientIP, cd.ClientPort);
//this.txtComInfo.AppendText("\r\n转发消息报文：" + repMsg);
this.txtComInfo.AppendText("\r\n转发" + cs.Username + "---->" + cd.Username + " 消息报文：" + new AES(comClientGroup.Kaes).AesDecipher(recStrArr[3]).Trim());
}
}
//客户端断开消息
if ("8" == recStrArr[0])
{
this.txtComInfo.AppendText("\r\n--------断开用户：" + recStr);
string username = recStrArr[1];
//去除regClients中的该用户
int i = 0;
for (i = 0; i < regClients.Count; i++)
{
if (((RegClient)regClients[i]).Username == username)
{
regClients.RemoveAt(i);
break;
}
}
//去除取得证书的用户列表中的该用户
i = 0;
for (i = 0; i < cerClients.Count; i++)
{
if (((CerClient)cerClients[i]).Username == username)
{
cerClients.RemoveAt(i);
break;
}
}
//证书获得者页面刷新
this.lbxCerClient.Items.Clear();
for (int x = 0; x < cerClients.Count; x++)
{
this.lbxCerClient.Items.Add(cerClients[x]);
}
if (comClientGroups.Count != 0)
{
ArrayList comClientGroupsTemp = new ArrayList();
i = 0;
for (i = 0; i < comClientGroups.Count; i++)
{
comClientGroupsTemp.Add(comClientGroups[i]);
}
//ArrayList comClientGroupsTemp = comClientGroups;
//去除通信组中的该用户
i = 0;
for (i = 0; i < comClientGroupsTemp.Count; i++)
{
ComClientGroup ccg = (ComClientGroup)comClientGroupsTemp[i];
if ((ccg.CerClient1.Username == username || ccg.CerClient2.Username == username))
{
comClientGroups.Remove(ccg);
//comClientGroups.Remove();
}
}
//刷新页面
//通信组显示
this.lbxComClient.Items.Clear();
for (int j = 0; j < comClientGroups.Count; j++)
{
this.lbxComClient.Items.Add((ComClientGroup)comClientGroups[j]);
}
}
//广播用户断开消息
string rep = "8|" + rsa.Encryption(username, KDCp, KDCq, KDCd);
for (i = 0; i < cerClients.Count; i++)
{
sendMessage(aes.AesEncipher(rep), ((CerClient)cerClients[i]).ClientIP, ((CerClient)cerClients[i]).ClientPort);
}
}
//测试
//sendMessage("connect",IPAddress.Parse("127.0.0.1") ,int.Parse("1000"));
}
}
