客户端未收到加密后数据被截断

Question

向服务器发送数据的代码

BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
OutputStream ostream = sock.getOutputStream(); 
 PrintWriter pwrite = new PrintWriter(ostream, true);
 // receiving from server ( receiveRead  object)
 InputStream istream = sock.getInputStream();
 BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));

 String receiveMessage, sendMessage;               
 while(true)
 {
    sendMessage = keyRead.readLine();  // keyboard reading
    String enc = crypt.encrypt(sendMessage, serverPublicKey);
    System.out.println("sending to server: "+enc);
    pwrite.println(enc);       // sending to server
    pwrite.flush();                    // flush the data
    if((receiveMessage = receiveRead.readLine()) != null) //receive from server
    {
        //System.out.println(crypt.decrypt(receiveMessage, clientPrivateKey)); // displaying at DOS prompt
        System.out.println(receiveMessage);
    }         
  }

输出加密后在控制台上如下所示

sending to server: YRJ7ZNgqSQ56nGc8ff7ktoybYEohQJS2R+Vh3YN1YfHipUS64MyFrrYAzL4CiTPv2WF7zvaJst1A
qsiPsv3/1Q==

要在服务器上接收的代码

      BufferedReader keyRead = new BufferedReader(new InputStreamReader(System.in));
      // sending to client (pwrite object)
      OutputStream ostream = sock.getOutputStream(); 
      PrintWriter pwrite = new PrintWriter(ostream, true);

      // receiving from server ( receiveRead  object)
      InputStream istream = sock.getInputStream();
      BufferedReader receiveRead = new BufferedReader(new InputStreamReader(istream));

      String receiveMessage, sendMessage;               
      while(true)
      {
        if((receiveMessage = receiveRead.readLine()) != null)  
        {
           //System.out.println(crypt.decrypt(receiveMessage, serverPrivateKey));
            System.out.println(receiveMessage);
        }         
        sendMessage = keyRead.readLine(); 
        String enc = crypt.encrypt(sendMessage, clientPublicKey);
        System.out.println("sending to clinet: "+enc);
        pwrite.println(enc);             
        pwrite.flush();
      }

但是接收到的数据像

YRJ7ZNgqSQ56nGc8ff7ktoybYEohQJS2R+Vh3YN1YfHipUS64MyFrrYAzL4CiTPv2WF7zvaJst1A

其余

qsiPsv3/1Q==

从服务器向客户端发送东西时收到，请帮我定位问题，由于截断数据导致解密失败

Answer 1

您不仅对输入进行了加密，而且还对加密字节进行了 Base64 编码。您的 Base64 编码器每 76 个字符插入换行符，这是 Base64 transfer encoding for MIME (RFC 2045) 的标准。这就是为什么在服务器端你的 readLine() 只读取前 76 个字符。

您需要将 Base64 编码器配置为不添加换行符。

客户端未收到加密后数据被截断

Data Truncated After Encryption Not Received at Client

java

sockets

tcp

rsa