Marcus:
> I need to make sure that the password is not kept in memory when
> QLineEdit is destroyed. I tried to use QLineEdit::clear() or
> QLineEdit::setText() but the password string stays in memory. I
> basically want to zeroise the private member string that holds the
> text, I believe QLineEditPrivate::text is the one. How can I access
> this member without changing Qt sources?
Object-oriented programming gives and object-oriented
programming takes away. This is one of those cases
where it takes away. Unless you're willing to go to
hacky lengths to get around the C++ object system,
then by design, you *CAN'T* get to private members.
But what you're proposing would be a very nice, very
sensible feature for QLineEdit when it's running in
QLineEdit::Password or QLineEdit::PasswordEchoOnEdit
or even QLineEdit::NoEcho mode: securely clean up the
private data upon destruction. So why not modify the
sources and pass your change back to the community?
This sounds like a pretty simple change.
Atlant
-----Original Message-----
From: interest-bounces+aschmidt=dekaresearch....@qt-project.org
[mailto:interest-bounces+aschmidt=dekaresearch....@qt-project.org] On Behalf Of
Marcus Frenkel
Sent: Wednesday, April 04, 2012 06:24
To: interest@qt-project.org
Subject: [Interest] QLineEdit - clearing the password from memory
Hi
I need to make sure that the password is not kept in memory when
QLineEdit is destroyed. I tried to use QLineEdit::clear() or
QLineEdit::setText() but the password string stays in memory. I
basically want to zeroise the private member string that holds the
text, I believe QLineEditPrivate::text is the one. How can I access
this member without changing Qt sources?
The alternative is to catch key events and store the text in a string
I can control, but there is too much to implement considering the
usage of selection, delete, backspace, arrow keys etc.
Thank you!
Marcus
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