private static byte[] UnprotectData(byte[] data, int dwFlags)
{
byte[] array = null;
SafeCryptoBlobIn safeCryptoBlobIn = null;
SafeCryptoBlobOut safeCryptoBlobOut = null;
try
{
safeCryptoBlobIn = new SafeCryptoBlobIn(data);
safeCryptoBlobOut = new SafeCryptoBlobOut();
if (NativeMethods.CryptUnprotectData(safeCryptoBlobIn, null, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, dwFlags, safeCryptoBlobOut))
{
NativeMethods.DATA_BLOB blob = safeCryptoBlobOut.Blob;
array = new byte[blob.cbData];
Marshal.Copy(blob.pbData, array, 0, blob.cbData);
safeCryptoBlobOut.ZeroBuffer();
return(array);
}
int lastWin32Error = Marshal.GetLastWin32Error();
string additionalTraceMessage = string.Format(CultureInfo.InvariantCulture, "CryptUnprotectData: Win32 error:{0}", lastWin32Error);
throw new ServerConfigurationErrorException(additionalTraceMessage);
}
finally
{
if (safeCryptoBlobIn != null)
{
safeCryptoBlobIn.Close();
}
if (safeCryptoBlobOut != null)
{
safeCryptoBlobOut.Close();
}
}
}
public static extern bool CryptUnprotectData(SafeCryptoBlobIn dataIn, StringBuilder ppszDataDescr, IntPtr optionalEntropy, IntPtr pvReserved, IntPtr pPromptStruct, int dwFlags, SafeCryptoBlobOut pDataOut);