Example #1
0
 // I stole this code from somewhere. It was open source. It's all cool.
 public static byte[] UnprotectData(byte[] data, int dwFlags)
 {
     DATA_BLOB data_blob1;
     DATA_BLOB data_blob2;
     byte[] buffer1 = null;
     data_blob1 = new DATA_BLOB();
     data_blob1.cbData = data.Length;
     data_blob1.pbData = Marshal.AllocHGlobal(data_blob1.cbData);
     Marshal.Copy(data, 0, data_blob1.pbData, data_blob1.cbData);
     data_blob2 = new DATA_BLOB();
     try
     {
         if (CryptUnprotectData(ref data_blob1, null, IntPtr.Zero,
         IntPtr.Zero, IntPtr.Zero, dwFlags, ref data_blob2))
         {
             buffer1 = new byte[data_blob2.cbData];
             Marshal.Copy(data_blob2.pbData, buffer1, 0, data_blob2.cbData);
             byte[] buffer2 = new byte[data_blob2.cbData];
             Marshal.Copy(data_blob2.pbData, buffer2, 0, data_blob2.cbData);
             LocalFree(data_blob2.pbData);
             data_blob2.pbData = IntPtr.Zero;
             return buffer1;
         }
         int num1 = Marshal.GetLastWin32Error();
         string text1 = string.Format("CryptUnprotectData: Win32 error:{0}", num1);
         throw new Exception(text1);
     }
     finally
     {
         if (data_blob1.pbData != IntPtr.Zero)
             Marshal.FreeHGlobal(data_blob1.pbData);
         while (data_blob2.pbData != IntPtr.Zero)
         {
             LocalFree(data_blob2.pbData);
             data_blob2.pbData = IntPtr.Zero;
             break;
         }
     }
     return buffer1;
 }
Example #2
0
 internal static extern bool CryptUnprotectData(ref DATA_BLOB dataIn, StringBuilder ppszDataDescr, IntPtr optionalEntropy, IntPtr pvReserved, IntPtr pPromptStruct, int dwFlags, ref DATA_BLOB pDataOut);