9XFetxaH

1import java.net.*;
2import java.io.*;
3import java.security.InvalidAlgorithmParameterException;
4import java.security.InvalidKeyException;
5import java.security.NoSuchAlgorithmException;
6import javax.crypto.*;
7import javax.crypto.spec.IvParameterSpec;
8import javax.crypto.spec.SecretKeySpec;
9
10public class Server{
11    public static void main(String args[]){
12        int number=0;
13        try{
14            int serverPort = 4567;
15            ServerSocket listenSocket = new ServerSocket(serverPort);
16            while(true) {
17                Socket clientSocket = listenSocket.accept();
18                new Connection(clientSocket,number);
19                number++;
20            }
21        } catch(IOException e) {
22            System.out.println("Listen:" + e.getMessage());
23        }
24    }
25}
26
27class Connection extends Thread {
28    DataInputStream in;
29    DataOutputStream out;
30    Socket clientSocket;
31    int number;
32
33    public Connection (Socket aClientSocket,int clientNumber) {
34
35        try{
36            number=clientNumber;
37            clientSocket = aClientSocket;
38            in = new DataInputStream(clientSocket.getInputStream());
39            out = new DataOutputStream(clientSocket.getOutputStream());
40            this.start();
41        }catch(IOException e){System.out.println("Connection:" + e.getMessage());}
42    }
43
44    public void run(){
45        try{
46            while(true){
47                /*String data = in.readUTF();
48                writeFile("C:\\Users\\maria\\IdeaProjects\\AC1\\src\\input1.txt", data);
49
50                //key
51                KeyGenerator keyGen = KeyGenerator.getInstance("AES");
52                keyGen.init(128);
53                SecretKey secretKey = keyGen.generateKey();
54
55                //nonce
56                byte[] nonce={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
57                IvParameterSpec iv = new IvParameterSpec(nonce);
58
59                Cipher c = Cipher.getInstance("AES/CTR/NoPadding");
60                c.init(Cipher.ENCRYPT_MODE, secretKey, iv);
61                processFile(c, "C:\\Users\\maria\\IdeaProjects\\AC1\\src\\input1.txt", "C:\\Users\\maria\\IdeaProjects\\AC1\\src\\output1.txt");
62
63                c.init(Cipher.DECRYPT_MODE, secretKey, iv);
64                processFile(c, "C:\\Users\\maria\\IdeaProjects\\AC1\\src\\output1.txt", "C:\\Users\\maria\\IdeaProjects\\AC1\\src\\output2.txt");
65
66                //out.writeUTF("["+number+"]"+" "+data);
67                System.out.println("["+number+"]"+" "+data);*/
68
69                //key
70                byte [] key = {1,2,3,4,1,2,3,4,1,2,3,4,1,2,3,4};
71                SecretKey secretKey = new SecretKeySpec(key, 0, secretKey.length, "AES");
72
73                //nonce
74                byte[] nonce={1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1};
75                IvParameterSpec iv = new IvParameterSpec(nonce);
76
77                Cipher c = Cipher.getInstance("AES/CTR/NoPadding");
78                c.init(Cipher.DECRYPT_MODE, secretKey, iv);
79                processFile(c);
80            }
81        } catch (NoSuchPaddingException e) {
82            e.printStackTrace();
83        } catch (NoSuchAlgorithmException e) {
84            e.printStackTrace();
85        } catch (InvalidKeyException e) {
86            e.printStackTrace();
87        } catch (InvalidAlgorithmParameterException e) {
88            e.printStackTrace();
89        }
90    }
91
92    public void writeFile(String inputFile, String data)
93            throws IOException {
94        FileOutputStream file = new FileOutputStream(inputFile);
95        file.write(data.getBytes());
96    }
97
98    /*static private void processFile(Cipher c,String inFile,String outFile) throws FileNotFoundException {
99        try (FileInputStream inputFile = new FileInputStream(inFile);
100             FileOutputStream outputFile = new FileOutputStream(outFile)) {
101            byte[] inputBuf = new byte[1024];
102            int len;
103            while ((len = inputFile.read(inputBuf)) != -1) {
104                byte[] outputBuf = c.update(inputBuf, 0, len);
105                if ( outputBuf != null ) outputFile.write(outputBuf);
106            }
107            byte[] outputBuf = c.doFinal();
108            if ( outputBuf != null ) outputFile.write(outputBuf);
109        } catch (IOException e) {
110            e.printStackTrace();
111        } catch (BadPaddingException e) {
112            e.printStackTrace();
113        } catch (IllegalBlockSizeException e) {
114            e.printStackTrace();
115        }
116    }*/
117
118    static private void processFile(Cipher c){
119        try (FileInputStream inputFile = new FileInputStream("C:\\Users\\maria\\IdeaProjects\\AC1\\src\\encrypt.txt");
120             CipherInputStream cis = new CipherInputStream(inputFile, c);
121             FileOutputStream outputFile = new FileOutputStream("C:\\Users\\maria\\IdeaProjects\\AC1\\src\\decrypt.txt");
122             CipherOutputStream cos = new CipherOutputStream(outputFile, c)) {
123            byte[] inputBuf = new byte[1024];
124            int aux;
125            while ((aux = cis.read(inputBuf)) != -1) {
126                System.out.print((char) aux);
127
128                //byte[] outputBuf = c.update(inputBuf, 0, aux);
129                //if ( outputBuf != null ) outputFile.write(outputBuf);
130            }
131
132            /*while((text=System.in.read())!=-1) {
133                        cos.write((byte)text);
134                        cos.write("\n".getBytes());
135                        cos.write("\\\\\\\\\\\\".getBytes());
136                        cos.flush();
137                    }*/
138
139            byte[] outputBuf = c.doFinal();
140            if ( outputBuf != null ) outputFile.write(outputBuf);
141        } catch (IOException e) {
142            e.printStackTrace();
143        } catch (BadPaddingException e) {
144            e.printStackTrace();
145        } catch (IllegalBlockSizeException e) {
146            e.printStackTrace();
147        }
148    }
149}