ios 字符串MD5加密，返回加密后的字符串

 1 #import <CommonCrypto/CommonDigest.h> // Need to import for CC_MD5 access
 2 
 3 
 4 - (NSString *)md5:(NSString *)str
 5 {
 6     const char *cStr = [str UTF8String];
 7     unsigned char result[16];
 8     CC_MD5(cStr, strlen(cStr), result); // This is the md5 call
 9     return [NSString stringWithFormat:
10         @"%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
11         result[0], result[1], result[2], result[3], 
12         result[4], result[5], result[6], result[7],
13         result[8], result[9], result[10], result[11],
14         result[12], result[13], result[14], result[15]
15         ]; 
16 }

 1 package com.hiveview.phone.util;
 2 
 3 import java.security.MessageDigest;
 4 
 5 
 6 public class Md5Utils {
 7  
 8         private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5","6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };
 9  
10 
11         /**
12  
13          * 转换字节数组为16进制字串
14  
15          * 
16          * @param b
17  
18          *            字节数组
19  
20          * @return 16进制字串
21  
22          */
23  
24         public static String byteArrayToHexString(byte[] b) {
25  
26                 StringBuffer resultSb = new StringBuffer();
27  
28                 for (int i = 0; i < b.length; i++)
29                 {
30  
31                         resultSb.append(byteToHexString(b[i]));
32  
33                 }
34  
35                 return resultSb.toString();
36  
37         }
38  
39 
40         private static String byteToHexString(byte b) {
41  
42                 int n = b;
43  
44                 if (n < 0)
45  
46                         n = 256 + n;
47  
48                 int d1 = n / 16;
49  
50                 int d2 = n % 16;
51  
52                 return hexDigits[d1] + hexDigits[d2];
53  
54         }
55  
56 
57         public static String MD5Encode(String origin) {
58  
59                 String resultString = null;
60  
61 
62                 try {
63  
64                         resultString = new String(origin);
65  
66                         MessageDigest md = MessageDigest.getInstance("MD5");
67  
68                         resultString = byteArrayToHexString(md.digest(resultString.getBytes()));
69  
70                 } catch (Exception ex) {
71  
72                     ex.printStackTrace();
73                 }
74  
75                 return resultString;
76  
77         }
78  
79 }