iOS MD5密碼編譯演算法

    原帖地址：http://blog.csdn.net/pjk1129/article/details/6855024

    MD5密碼編譯演算法，實作類別別如下：

#import <CommonCrypto/CommonDigest.h>@interface NSString (md5)-(NSString *) md5HexDigest;@end#import "NSString+MD5HexDigest.h"@implementation NSString (md5) -(NSString *) md5HexDigest{   const char *original_str = [self UTF8String];   unsigned char result[CC_MD5_DIGEST_LENGTH];   CC_MD5(original_str, strlen(original_str), result);   NSMutableString *hash = [NSMutableString string];   for (int i = 0; i < 16; i++)        [hash appendFormat:@"%02X", result[i]];   return [hash lowercaseString];} @end