fqhYspGq

1/*
2 * To change this license header, choose License Headers in Project Properties.
3 * To change this template file, choose Tools | Templates
4 * and open the template in the editor.
5 */
6package encrpyionproject;
7
8import java.io.FileInputStream;
9import java.io.FileOutputStream;
10import java.io.IOException;
11import java.io.InputStream;
12import java.io.OutputStream;
13import javax.crypto.Cipher;
14import javax.crypto.CipherInputStream;
15import javax.crypto.CipherOutputStream;
16import javax.crypto.SecretKey;
17import javax.crypto.SecretKeyFactory;
18import javax.crypto.spec.DESKeySpec;
19
20/**
21 *
22 * @author mahmudul.hasan
23 */
24
25public class EncrpyionProject {
26
27    /**
28     * @param args the command line arguments
29     */
30    
31    public static void main(String[] args) {
32        // TODO code application logic here
33        try {
34            String key = "XXXXXXXXXXX"; // needs to be at least 8 characters for DES
35
36            /*  FileInputStream fis = new FileInputStream("D:\\MedicineD\\keys.txt");
37            FileOutputStream fos = new FileOutputStream("D:\\MedicineD\\empty.jpg");            
38            encrypt(key, fis, fos);*/
39//
40            FileInputStream fis2 = new FileInputStream("D:\\XXXX\\empty.jpg");
41            FileOutputStream fos2 = new FileOutputStream("D:\\XXXXX\\keys_new.txt");
42            decrypt(key, fis2, fos2);
43        } catch (Throwable e) {
44            e.printStackTrace();
45        }
46    }
47
48    public static void encrypt(String key, InputStream is, OutputStream os) throws Throwable {
49        encryptOrDecrypt(key, Cipher.ENCRYPT_MODE, is, os);
50    }
51
52    public static void decrypt(String key, InputStream is, OutputStream os) throws Throwable {
53        encryptOrDecrypt(key, Cipher.DECRYPT_MODE, is, os);
54    }
55
56    public static void encryptOrDecrypt(String key, int mode, InputStream is, OutputStream os) throws Throwable {
57
58        DESKeySpec dks = new DESKeySpec(key.getBytes());
59        SecretKeyFactory skf = SecretKeyFactory.getInstance("DES");
60        SecretKey desKey = skf.generateSecret(dks);
61        Cipher cipher = Cipher.getInstance("DES"); // DES/ECB/PKCS5Padding for SunJCE
62
63        if (mode == Cipher.ENCRYPT_MODE) {
64            cipher.init(Cipher.ENCRYPT_MODE, desKey);
65            CipherInputStream cis = new CipherInputStream(is, cipher);
66            doCopy(cis, os);
67        } else if (mode == Cipher.DECRYPT_MODE) {
68            cipher.init(Cipher.DECRYPT_MODE, desKey);
69            CipherOutputStream cos = new CipherOutputStream(os, cipher);
70            doCopy(is, cos);
71        }
72    }
73
74    public static void doCopy(InputStream is, OutputStream os) throws IOException {
75        byte[] bytes = new byte[64];
76        int numBytes;
77        while ((numBytes = is.read(bytes)) != -1) {
78            os.write(bytes, 0, numBytes);
79        }
80        os.flush();
81        os.close();
82        is.close();
83    }
84
85}