Segmentation fault while using QCA

Gowtam

I've been getting the following segmentation fault when compiling:

"The inferior stopped because it received a signal from the Operating System.
Signal name : SIGSEGV
Signal meaning : Segmentation fault"

Stacktrace:
0 lockInline qmutex.h 187 0x7ffff7b3f33b
1 QMutexLocker qmutex.h 109 0x7ffff7b3f33b
2 QCA::init qca_core.cpp 185 0x7ffff7b3f33b
3 RegistrationDialog::verifyKey registrationdialog.cpp 60 0x4b15e8

following is the function:
@bool RegistrationDialog::verifyKey(QString Registeredkey)
{
QString generated_key;
QString mac_address = getMacAddress();

// the Initializer object sets things up, and
// also does cleanup when it goes out of scope
QCA::Initializer init = QCA::Initializer();

QString PassKey = "iXBv9TobQ545Fc4AB";
QCA::SymmetricKey key(16);
QCA::InitializationVector iv(PassKey.toLatin1());
QCA::Cipher cipher(QString( "des" ), QCA::Cipher::CBC, QCA::Cipher::PKCS7, QCA::Encode, key, iv);


// we use the first argument if provided, or
// use "hello" if no arguments

// QCA::SecureArray arg = (argc >= 2) ? argv[1] : "hello";
QCA::SecureArray arg = mac_address.toUtf8();

// DES testing
if(!QCA::isSupported("des-cbc-pkcs7"))
    printf("DES-CBC not supported!\n");
else {

    QCA::SecureArray u = cipher.update(arg);

    // We need to check if that update() call worked.
    if (!cipher.ok()) {
        qDebug()<<"Update failed";
    }

    QCA::SecureArray f = cipher.final();

    // Check if the final() call worked
    if (!cipher.ok()) {
        qDebug()<<"Final failed";
    }

    generated_key = qPrintable(QCA::arrayToHex(f.toByteArray()));

    if ( Registeredkey == generated_key ) {
        return true;
    } else {
        qDebug()<<"not true!";
        return false;
    }
}

return false;

}@

SGaist

Hi and welcome to devnet,

Are you building your program with Qt 5 and are you using QCA from your system ?

Gowtam

Thanks for the reply.
Yes, I'm using Qt5. I'm using QCA from the system itself.

SGaist

Then you QCA is probably linked to Qt 4, which results in the crash (there was a "thread":http://qt-project.org/forums/viewthread/30218 about that not long ago)

So you have two choices:

Build your application with Qt 4
Build your own version of QCA with Qt 5

Gowtam

I downloaded QCA source from the respective website. But, how to make it compile with Qt5?
Or is this someway related to Qmutexlocker?

SGaist

No it's related to the fact that loading both Qt 4 and Qt 5 in the same address space is not supported.

You'll have to follow the instructions provided, I have not yet built QCA with Qt 5