exLE9Fwv

1import java.io.File;
2import java.io.FileInputStream;
3import java.io.FileOutputStream;
4import java.io.IOException;
5import java.security.InvalidKeyException;
6import java.security.Key;
7import java.security.NoSuchAlgorithmException;
8
9import javax.crypto.BadPaddingException;
10import javax.crypto.Cipher;
11import javax.crypto.IllegalBlockSizeException;
12import javax.crypto.NoSuchPaddingException;
13import javax.crypto.spec.SecretKeySpec;
14
15public class Crypto {
16
17   static void fileProcessor(int cipherMode,String key,File inputFile,File outputFile){
18	 try {
19	       Key secretKey = new SecretKeySpec(key.getBytes(), "AES");
20	       Cipher cipher = Cipher.getInstance("AES");
21	       cipher.init(cipherMode, secretKey);
22
23	       FileInputStream inputStream = new FileInputStream(inputFile);
24	       byte[] inputBytes = new byte[(int) inputFile.length()];
25	       inputStream.read(inputBytes);
26
27	       byte[] outputBytes = cipher.doFinal(inputBytes);
28
29	       FileOutputStream outputStream = new FileOutputStream(outputFile);
30	       outputStream.write(outputBytes);
31
32	       inputStream.close();
33	       outputStream.close();
34
35	    } catch (NoSuchPaddingException | NoSuchAlgorithmException
36                     | InvalidKeyException | BadPaddingException
37	             | IllegalBlockSizeException | IOException e) {
38		e.printStackTrace();
39            }
40     }
41
42     public static void main(String[] args) {
43	String key = "This is a secret";
44	File inputFile = new File("text.txt");
45	File encryptedFile = new File("text.encrypted");
46	File decryptedFile = new File("decrypted-text.txt");
47
48	try {
49	     Crypto.fileProcessor(Cipher.ENCRYPT_MODE,key,inputFile,encryptedFile);
50	     Crypto.fileProcessor(Cipher.DECRYPT_MODE,key,encryptedFile,decryptedFile);
51	     System.out.println("Sucess");
52	 } catch (Exception ex) {
53	     System.out.println(ex.getMessage());
54             ex.printStackTrace();
55	 }
56     }
57
58}