wn0UBuL3

1import javax.crypto.Cipher;
2import javax.crypto.KeyGenerator;
3import javax.crypto.SecretKey;
4
5class DesEncrypter {
6  Cipher ecipher;
7
8  Cipher dcipher;
9
10  DesEncrypter(SecretKey key) throws Exception {
11    ecipher = Cipher.getInstance("DES");
12    dcipher = Cipher.getInstance("DES");
13    ecipher.init(Cipher.ENCRYPT_MODE, key);
14    dcipher.init(Cipher.DECRYPT_MODE, key);
15  }
16
17  public String encrypt(String str) throws Exception {
18    // Encode the string into bytes using utf-8
19    byte[] utf8 = str.getBytes("UTF8");
20
21    // Encrypt
22    byte[] enc = ecipher.doFinal(utf8);
23
24    // Encode bytes to base64 to get a string
25    return new sun.misc.BASE64Encoder().encode(enc);
26  }
27
28  public String decrypt(String str) throws Exception {
29    // Decode base64 to get bytes
30    byte[] dec = new sun.misc.BASE64Decoder().decodeBuffer(str);
31
32    byte[] utf8 = dcipher.doFinal(dec);
33
34    // Decode using utf-8
35    return new String(utf8, "UTF8");
36  }
37}
38
39public class Main {
40  public static void main(String[] argv) throws Exception {
41    SecretKey key = KeyGenerator.getInstance("DES").generateKey();
42    DesEncrypter encrypter = new DesEncrypter(key);
43    String encrypted = encrypter.encrypt("Don't tell anybody!");
44    String decrypted = encrypter.decrypt(encrypted);
45  }
46}