48HQ79Ev

1import java.security.*;
2import javax.crypto.*;
3
4public class DES {
5	public static void main(String[] argv) {
6
7		try {
8//			KeyGenerator keyGen = KeyGenerator.getInstance("DES");
9//			keyGen.init(56);
10//			SecretKey secretKey = keyGen.generateKey();
11			SecretKey secretKey = KeyGenerator.getInstance("DES").generateKey();
12
13			Cipher des;
14			des = Cipher.getInstance("DES/ECB/PKCS5Padding");
15			des.init(Cipher.ENCRYPT_MODE, secretKey);
16
17			// cipher message
18			byte[] plainText = "This is my private message no.12, Hello world".getBytes();
19
20			System.out.println("Text [Byte Format] : " + plainText);
21			System.out.println("Text : " + new String(plainText));
22
23			// Encrypt
24			byte[] textEncrypted = des.doFinal(plainText);
25
26			System.out.println("Text Encryted : " + textEncrypted);
27
28			// Initialize the same cipher for decryption
29			des.init(Cipher.DECRYPT_MODE, secretKey);
30
31			// Decrypt the text
32			byte[] textDecrypted = des.doFinal(textEncrypted);
33
34			System.out.println("Text Decryted : " + new String(textDecrypted));
35
36		} catch (NoSuchAlgorithmException e) {
37			e.printStackTrace();
38		} catch (NoSuchPaddingException e) {
39			e.printStackTrace();
40		} catch (InvalidKeyException e) {
41			e.printStackTrace();
42		} catch (IllegalBlockSizeException e) {
43			e.printStackTrace();
44		} catch (BadPaddingException e) {
45			e.printStackTrace();
46		}
47	}
48}