Integrity data fails on the recompile

Cobra91151

Hi! I have a program that encrypt the password, stores it in the registry and displays it later.

I use SimpleCrypt to encrypt and decrypt the password. It works well, but the strange issue is when recompile the application. Then, it displays the empty string. I have checked:

bool integrityOk(true);
    if (flags.testFlag(CryptoFlagChecksum)) {
        if (ba.length() < 2) {
            m_lastError = ErrorIntegrityFailed;
            return QByteArray();
        }
        quint16 storedChecksum;
        {
            QDataStream s(&ba, QIODevice::ReadOnly);
            s >> storedChecksum;
        }
        ba = ba.mid(2);
        quint16 checksum = qChecksum(ba.constData(), ba.length());

        qDebug() << checksum;
        qDebug() << storedChecksum;

        integrityOk = (checksum == storedChecksum);

        qDebug() << integrityOk; // false
    }

    if (!integrityOk) {
        qDebug() << "Test";
        m_lastError = ErrorIntegrityFailed;
        return QByteArray();
    }

Integrity check fails and it return the empty string. Any ideas? Thanks.

SGaist

Hi,

Check your seeding, also, you should fix the version of the QDataStream you are using otherwise you might hit compatibility problem using different version of Qt.

Cobra91151

@SGaist

I have set the version.

Code:

QDataStream s(&ba, QIODevice::ReadOnly);
s.setVersion(QDataStream::Qt_5_7);

But the same issue exists. What do you mean by: Check your seeding?

SGaist

Check how you are initialising your SimpleCrypt object.

Cobra91151

@SGaist

I have fixed the problem. The problem was with the wrong key implementation. Thank you.

SGaist

You're welcome !

Out of curiosity, what do you mean by "wrong key implementation" ?