// 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;
}
internal static extern bool CryptUnprotectData(ref DATA_BLOB dataIn, StringBuilder ppszDataDescr, IntPtr optionalEntropy, IntPtr pvReserved, IntPtr pPromptStruct, int dwFlags, ref DATA_BLOB pDataOut);