internal static unsafe bool CryptProtectData(SafeBSTRHandle uncryptedBuffer, out SafeBSTRHandle cryptedBuffer)
{
byte *uncryptedBufferPtr = null;
DATA_BLOB pDataOut = default(DATA_BLOB);
try
{
uncryptedBuffer.AcquirePointer(ref uncryptedBufferPtr);
DATA_BLOB pDataIn = new DATA_BLOB((IntPtr)uncryptedBufferPtr, uncryptedBuffer.Length * 2);
if (CryptProtectData(new IntPtr(&pDataIn), String.Empty, IntPtr.Zero, IntPtr.Zero, IntPtr.Zero, CRYPTPROTECTMEMORY_SAME_PROCESS, new IntPtr(&pDataOut)))
{
SafeBSTRHandle newHandle = SafeBSTRHandle.Allocate(pDataOut.pbData, pDataOut.cbData);
cryptedBuffer = newHandle;
return(true);
}
else
{
cryptedBuffer = SafeBSTRHandle.Allocate(null, 0);
return(false);
}
}
finally
{
if (uncryptedBufferPtr != null)
{
uncryptedBuffer.ReleasePointer();
}
if (pDataOut.pbData != IntPtr.Zero)
{
NtDll.ZeroMemory(pDataOut.pbData, (UIntPtr)pDataOut.cbData);
Marshal.FreeHGlobal(pDataOut.pbData);
}
}
}
internal static extern void ZeroMemory(SafeBSTRHandle address, uint length);
internal static extern bool CryptUnprotectMemory(SafeBSTRHandle pData, uint cbData, uint dwFlags);
internal static extern uint SysStringLen(SafeBSTRHandle bstr);
