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 b17  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 }