android----Java DES加密算法工具类

 1 package entity;
 2 
 3 import javax.crypto.Cipher;
 4 import javax.crypto.SecretKey;
 5 import javax.crypto.SecretKeyFactory;
 6 import javax.crypto.spec.DESKeySpec;
 7 import javax.crypto.spec.IvParameterSpec;
 8 
 9 public class Des {
10     private byte[] desKey;   
11       
12     
13     //解密数据   
14     public static String decrypt(String message,String key) throws Exception {   
15             
16             byte[] bytesrc =convertHexString(message);      
17             Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");       
18             DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));      
19             SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");      
20             SecretKey secretKey = keyFactory.generateSecret(desKeySpec);      
21             IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));   
22                    
23             cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);         
24              
25             byte[] retByte = cipher.doFinal(bytesrc);        
26             return new String(retByte);    
27     }   
28   
29     public static byte[] encrypt(String message, String key)   
30             throws Exception {   
31         Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");   
32   
33         DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));   
34   
35         SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");   
36         SecretKey secretKey = keyFactory.generateSecret(desKeySpec);   
37         IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));   
38         cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);   
39   
40         return cipher.doFinal(message.getBytes("UTF-8"));   
41     }   
42        
43     public static byte[] convertHexString(String ss)    
44     {    
45     byte digest[] = new byte[ss.length() / 2];    
46     for(int i = 0; i < digest.length; i++)    
47     {    
48     String byteString = ss.substring(2 * i, 2 * i + 2);    
49     int byteValue = Integer.parseInt(byteString, 16);    
50     digest[i] = (byte)byteValue;    
51     }    
52   
53     return digest;    
54     }    
55     
56     public static String toHexString(byte b[]) {   
57         StringBuffer hexString = new StringBuffer();   
58         for (int i = 0; i < b.length; i++) {   
59             String plainText = Integer.toHexString(0xff & b[i]);   
60             if (plainText.length() < 2)   
61                 plainText = "0" + plainText;   
62             hexString.append(plainText);   
63         }   
64            
65         return hexString.toString();   
66     }   
67   
68   
69     public static void main(String[] args) throws Exception {   
70         String key = "12345678";   
71         String value="test1234";   
72         String jiami=java.net.URLEncoder.encode(value, "utf-8").toLowerCase();   
73            
74         System.out.println("加密数据:"+jiami);   
75         String a=toHexString(encrypt(jiami, key)).toUpperCase();   
76         System.out.println("加密后的数据为:"+a);  
77         
78         
79         String b=java.net.URLDecoder.decode(decrypt(a,key), "utf-8") ;   
80         System.out.println("解密后的数据:"+b);   
81   
82     }   
83   
84        
85     
86 }