http://snippets.dzone.com/posts Sun, 18 May 2008 10:39:56 GMT DZone Snippets: protection code http://snippets.dzone.com/posts/show/3891 <code> <br /> public static int GetRunCount() <br /> { <br /> int count = 0; <br /> string guid = ""; <br /> RegistryKey regKey = Registry.CurrentUser.OpenSubKey(@"Software\Classes\Software\Settings", true); <br /> <br /> if (regKey != null) <br /> { <br /> string temp = (string)regKey.GetValue("Options"); <br /> guid = (string)regKey.GetValue("Guid"); <br /> count = (int)(temp[0] ^ guid[0]); <br /> } <br /> <br /> return count; <br /> } <br /> public static int IncrementRun() <br /> { <br /> int count = 0; <br /> string guid = ""; <br /> RegistryKey regKey = Registry.CurrentUser.OpenSubKey(@"Software\Classes\Software\Settings", true); <br /> <br /> if (regKey == null) <br /> { <br /> regKey = Registry.CurrentUser.CreateSubKey(@"Software\Classes\Software\Settings"); <br /> guid = Guid.NewGuid().ToString(); <br /> regKey.SetValue("Guid", guid); <br /> count = 0; <br /> } <br /> else <br /> { <br /> string temp = (string)regKey.GetValue("Options"); <br /> guid = (string)regKey.GetValue("Guid"); <br /> count = (int)(temp[0] ^ guid[0]); <br /> } <br /> <br /> Random rnd = new Random(); <br /> count++; <br /> string value = string.Format("{0}{1}", (char)(guid[0] ^ count), GenerateGarbage(15)); <br /> <br /> regKey.SetValue("Options", value); <br /> <br /> return count; <br /> } <br /> private static string GenerateGarbage(int length) <br /> { <br /> string retVal; <br /> if (length < 0) <br /> retVal = null; <br /> else if (length == 0) <br /> retVal = ""; <br /> else <br /> { <br /> Random rnd = new Random(); <br /> StringBuilder str = new StringBuilder(); <br /> <br /> for (int i = 0; i < length; i++) <br /> str.Append((char)rnd.Next(33, 126)); <br /> retVal = str.ToString(); <br /> } <br /> return retVal; <br /> } <br /></code> Tue, 24 Apr 2007 22:43:07 GMT http://snippets.dzone.com/posts/show/3891 mstampar (Miroslav Stampar) http://snippets.dzone.com/posts/show/3884 <code> <br />IntPtr bstr = Marshal.SecureStringToBSTR(password); <br /> <br />try <br />{ <br /> // ... <br /> // use the bstr <br /> // ... <br />} <br />finally <br />{ <br /> Marshal.ZeroFreeBSTR(bstr); <br />} <br /> <br /></code> Tue, 24 Apr 2007 22:35:35 GMT http://snippets.dzone.com/posts/show/3884 mstampar (Miroslav Stampar)