IOS开发基础之—MD5加密算法【转】

原文地址：http://blog.csdn.net/pjk1129/article/details/6855024

#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