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Thread: TCP chat attaching cipher is not running

  1. #1
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    Default TCP chat attaching cipher is not running

    Hi,
    I did TCP chat no problem and I attached cipher and It no run. What is wrong on my code.
    import java.io.BufferedReader;
    import java.io.BufferedWriter;
    import java.io.IOException;
    import java.io.InputStreamReader;
    import java.io.OutputStream;
    import java.io.OutputStreamWriter;
    import java.net.ServerSocket;
    import java.net.Socket;
    import java.security.InvalidKeyException;
    import java.security.NoSuchAlgorithmException;
    import java.security.Security;
    import java.security.spec.AlgorithmParameterSpec;
    import java.util.logging.Level;
    import java.util.logging.Logger;
    import javax.crypto.Cipher;
    import javax.crypto.CipherInputStream;
    import javax.crypto.CipherOutputStream;
    import javax.crypto.NoSuchPaddingException;
    import javax.crypto.spec.IvParameterSpec;
    import javax.crypto.spec.SecretKeySpec;
    import org.bouncycastle.jce.provider.BouncyCastleProvider;
     
    /**
     *
     * @author Lolek
     */
    public class Main {
     
        /**
         * @param args the command line arguments
         */
        public static void main(String[] args) {
     
            String adresaIP;
            if(args.length==0)
            {
                adresaIP="127.0.0.1";
            }
            else
            {
                adresaIP=args[0];
            }
            PrijemVlakno prijimat = new PrijemVlakno();
            OdeslatVlakno odeslat = new OdeslatVlakno(adresaIP);
     
            prijimat.server.start();
            odeslat.klient.start();
        }
     
    }
     
    class PrijemVlakno implements Runnable
    {
      Thread server;  
     
      public PrijemVlakno()
      {
     
          server = new Thread(this,"Server vlakno");
      }
      public void run()
      {
            try {
     
                Security.addProvider(new BouncyCastleProvider());
                SecretKeySpec key = new SecretKeySpec("1234567891234567".getBytes("UTF-8"), "AES");
                AlgorithmParameterSpec iv = new IvParameterSpec("4567891234567AAA".getBytes("UTF-8"));
     
                String nameAlgorithm = "AES/ECB/PKCS7Padding";                
                Cipher decryption = Cipher.getInstance(nameAlgorithm);
                decryption.init(Cipher.DECRYPT_MODE, key); 
     
                ServerSocket serverSocket = new ServerSocket(4000);
                Socket clientSocket = null;
                clientSocket = serverSocket.accept();
     
                while(true)
                {   
                    CipherInputStream cip = new CipherInputStream(clientSocket.getInputStream(),decryption);
                    BufferedReader cteni = new BufferedReader(new InputStreamReader(cip));
                    String radek = null;
                        while((radek = cteni.readLine())!=null)
                        {
                            System.out.println(radek);
                            System.out.flush();
                        }
                }
     
            } catch (InvalidKeyException ex) {
                Logger.getLogger(PrijemVlakno.class.getName()).log(Level.SEVERE, null, ex);
            } catch (NoSuchAlgorithmException ex) {
                Logger.getLogger(PrijemVlakno.class.getName()).log(Level.SEVERE, null, ex);
            } catch (NoSuchPaddingException ex) {
                Logger.getLogger(PrijemVlakno.class.getName()).log(Level.SEVERE, null, ex);
            } catch (IOException ex) {
                Logger.getLogger(PrijemVlakno.class.getName()).log(Level.SEVERE, null, ex);
            }
     
     
      }
    }
     
    class OdeslatVlakno implements Runnable
    {   
        private String adresaIP;  
        Thread klient;
        private Socket socket;
        public OdeslatVlakno(String ip)
        {   
            this.adresaIP=ip;
            klient = new Thread(this,"Klient Vlakno");
        }
        public void run()
        {
            try {          
                try{
                 while (true) {
                     try {
                            socket = new Socket(this.adresaIP, 5000);
                            break;
                         }
                    catch (IOException e) {                       
                            Thread.sleep(1000);
                        }
                    }
                }
                catch (InterruptedException e) {
                    return;
                } 
     
     
     
                Security.addProvider(new BouncyCastleProvider());
                SecretKeySpec key = new SecretKeySpec("1234567891234567".getBytes("UTF-8"), "AES");
                AlgorithmParameterSpec iv = new IvParameterSpec("4567891234567AAA".getBytes("UTF-8"));
     
                String nameAlgorithm = "AES/ECB/PKCS7Padding";
                Cipher cipher = Cipher.getInstance(nameAlgorithm);
                cipher.init(Cipher.ENCRYPT_MODE, key);
     
                BufferedReader klavesnice = new BufferedReader(new InputStreamReader(System.in));
                OutputStream vystup = socket.getOutputStream();
                CipherOutputStream cip = new CipherOutputStream(vystup,cipher);
                BufferedWriter zapis = new BufferedWriter(new OutputStreamWriter(cip));
     
                String radek;
                while ((radek = klavesnice.readLine())!=null)
                {   
     
                    zapis.write(radek);
                    zapis.newLine();
                    zapis.flush();
     
                    System.out.println("Cteni radku:"+radek);
                }
            } 
            catch (InvalidKeyException ex) {
                Logger.getLogger(OdeslatVlakno.class.getName()).log(Level.SEVERE, null, ex);
            }        catch (NoSuchAlgorithmException ex) {
                Logger.getLogger(OdeslatVlakno.class.getName()).log(Level.SEVERE, null, ex);
            } catch (NoSuchPaddingException ex) {
                Logger.getLogger(OdeslatVlakno.class.getName()).log(Level.SEVERE, null, ex);
            }               catch (IOException ex) {
                Logger.getLogger(OdeslatVlakno.class.getName()).log(Level.SEVERE, null, ex);
            }
        }
    }


  2. #2
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    Default Re: TCP chat cipher

    Hello Koren3,

    What error messages are you getting when running this code?
    Please use [highlight=Java] code [/highlight] tags when posting your code.
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  3. #3
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    Default Re: TCP chat cipher

    No error, but another client doesnīt recive message.

  4. #4
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    Default Re: TCP chat cipher

    I donīt know what is problem...

  5. #5
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    Default Re: TCP chat cipher

    I know, where was a problem. I used block cipher. But I use stream cipher and it write this error: java.security.InvalidKeyException: no IV set when one expected. If i use stream cipher i don't need IV. I think. Where is the problem thank you.

    My code:
     Security.addProvider(new BouncyCastleProvider());
                SecretKeySpec key = new SecretKeySpec("1234567891234567".getBytes("UTF-8"), "Salsa20");
     
                String nameAlgorithm = "Salsa20";                
                Cipher decryption = Cipher.getInstance(nameAlgorithm);
                decryption.init(Cipher.DECRYPT_MODE, key);

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