DES加解密过程

 1 package com.pff.pff;
 2 
 3 import java.security.SecureRandom;
 4 
 5 import javax.crypto.Cipher;
 6 import javax.crypto.KeyGenerator;
 7 import javax.crypto.SecretKey;
 8 import javax.crypto.SecretKeyFactory;
 9 import javax.crypto.spec.DESKeySpec;
10 
11 import org.apache.commons.codec.binary.Hex;
12 
13 public class Des {
14 
15     private static String test = "pff";
16 
17     public static void main(String[] args) {
18         testDes();
19     }
20 
21     public static void testDes() {
22         try {
23             // 生成秘钥
24             KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
25             keyGenerator.init(new SecureRandom());
26             SecretKey generateKey = keyGenerator.generateKey();
27             byte[] encoded = generateKey.getEncoded();
28             // 秘钥转换
29             DESKeySpec desKeySpec = new DESKeySpec(encoded);
30             SecretKeyFactory instance = SecretKeyFactory.getInstance("DES");
31             SecretKey generateSecret = instance.generateSecret(desKeySpec);
32             // DES加密过程
33             Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5padding");
34             cipher.init(Cipher.ENCRYPT_MODE, generateSecret);
35             byte[] result = cipher.doFinal(test.getBytes());
36             System.out.println("DES加密过程结果= " + Hex.encodeHexString(result));
37             // 解密过程
38             cipher.init(Cipher.DECRYPT_MODE, generateSecret);
39             byte[] result2 = cipher.doFinal(result);
40             System.out.println("DES解密过程结果= " + new String(result2));
41         } catch (Exception e) {
42             e.printStackTrace();
43         }
44     }
45 
46 }