GazAqqWE

1import java.io.*;
2import java.security.*;
3import java.util.Scanner;
4import javax.crypto.*;
5
6public class AES {
7	public static void main(String[] argv) throws FileNotFoundException {
8		long startTime = System.nanoTime();
9		long endsTime1 = System.nanoTime() - startTime;
10		long endsTime2 = System.nanoTime() - startTime;
11		SecureRandom rand = new SecureRandom();
12
13		try {
14//			PrintStream out = new PrintStream(new FileOutputStream("AES-ECB.txt", true));
15			 PrintStream out = System.out;
16
17			KeyGenerator keyGen = KeyGenerator.getInstance("AES");
18			keyGen.init(128, rand);
19			SecretKey secretKey = keyGen.generateKey();
20			
21			Cipher aes;
22			aes = Cipher.getInstance("AES/ECB/PKCS5Padding");
23			aes.init(Cipher.ENCRYPT_MODE, secretKey);
24			
25			// cipher message
26//			byte[] plainText;
27			System.out.println("Give me message which you want encrypt: ");
28			Scanner sc = new Scanner(System.in);
29//			plainText = sc.nextLine().getBytes();
30			 byte[] plainText = "tomek".getBytes();
31
32			out.println("Message : " + new String(plainText));
33
34			// Encrypt message
35			startTime = System.nanoTime();
36			byte[] textEncrypted = aes.doFinal(plainText);
37			endsTime1 = System.nanoTime() - startTime;
38			out.println("Message encryted: " + textEncrypted);
39
40			// Initialize the same cipher for decryption
41			aes.init(Cipher.DECRYPT_MODE, secretKey);
42
43			// Decrypt message
44			startTime = System.nanoTime();
45			byte[] textDecrypted = aes.doFinal(textEncrypted);
46			endsTime2 = System.nanoTime() - startTime;
47			out.println("Message decryted: " + new String(textDecrypted));
48
49			out.println("Encryption: " + endsTime1 + " ns");
50			out.println("Decryption: " + endsTime2 + " ns");
51			out.println();
52			System.setOut(out);
53			out.close();
54
55		} catch (NoSuchAlgorithmException e) {
56			e.printStackTrace();
57		} catch (NoSuchPaddingException e) {
58			e.printStackTrace();
59		} catch (InvalidKeyException e) {
60			e.printStackTrace();
61		} catch (IllegalBlockSizeException e) {
62			e.printStackTrace();
63		} catch (BadPaddingException e) {
64			e.printStackTrace();
65//		} catch (FileNotFoundException e) {
66//			e.printStackTrace();
67		}
68	}
69
70}