iOS MD5加密算法

//MD5加密
+ (NSString *)md5HexDigest:(NSString*)password
{
   const char *original_str = [password 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]];
   }
    NSString *mdfiveString = [hash lowercaseString];

    return mdfiveString;
}