971HRwhz

1
2
3
4
5public static String encrypt(String kunci, String plaintext, int tipe) throws Exception 
6	{
7		byte[] rawKey = rawKey(kunci.getBytes(),tipe);
8		byte[] hasil = encrypt(rawKey,plaintext.getBytes());
9		return k_hexa(hasil);
10	}
11
12private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
13		SecretKeySpec s_kunci_rahasia = new SecretKeySpec(raw, "AES");
14		Cipher cipher = Cipher.getInstance("AES");
15		cipher.init(Cipher.ENCRYPT_MODE, s_kunci_rahasia);
16		byte[] encrypted = cipher.doFinal(clear);
17		return encrypted;
18	}
19
20	private static byte[] rawKey(byte[] kunci,int tipe) throws Exception
21 {
22		KeyGenerator kunci_gen = KeyGenerator.getInstance("AES");
23		SecureRandom acak = SecureRandom.getInstance("SHA1PRNG");
24		acak.setSeed(kunci);
25		kunci_gen.init(tipe, acak);
26		SecretKey kunci_rahasia = kunci_gen.generateKey();
27		byte[] raw = kunci_rahasia.getEncoded();
28		return raw;
29	}
30
31public static String k_hexa(byte[] buffer) {
32		if (buffer == null)
33		{
34			return "";
35		}
36		StringBuffer hasil = new StringBuffer(2 * buffer.length);
37		for (int i = 0; i < buffer.length; i++) 
38		{
39			appendHex(hasil, buffer[i]);
40		}
41		return hasil.toString();
42
43	}
44
45
46private final static String hexa = "0123456789ABCDEF";
47
48	private static void appendHex(StringBuffer str_buffer, byte b) {
49		str_buffer.append(hexa.charAt((b >> 4) & 0x0f)).append(hexa.charAt(b & 0x0f));
50	}