TOTP | Help



  • Hy, I want to create an application which will generate a TOTP code.
    (To connect to facebook,...).

    I found this code:

    QString hmacSha1(QByteArray key, QByteArray baseString)
    {
     int blockSize = 64; // HMAC-SHA-1 block size, defined in SHA-1 standard
     if (key.length() > blockSize) { // if key is longer than block size (64), reduce key length with SHA-1 compression
     key = QCryptographicHash::hash(key, QCryptographicHash::Sha1);
     }
    
    QByteArray innerPadding(blockSize, char(0x36)); // initialize inner padding with char "6"
     QByteArray outerPadding(blockSize, char(0x5c)); // initialize outer padding with char "quot;
     // ascii characters 0x36 ("6") and 0x5c ("quot;) are selected because they have large
     // Hamming distance (http://en.wikipedia.org/wiki/Hamming_distance)
    
    for (int i = 0; i < key.length(); i++) {
     innerPadding[i] = innerPadding[i] ^ key.at(i); // XOR operation between every byte in key and innerpadding, of key length
     outerPadding[i] = outerPadding[i] ^ key.at(i); // XOR operation between every byte in key and outerpadding, of key length
     }
    
    // result = hash ( outerPadding CONCAT hash ( innerPadding CONCAT baseString ) ).toBase64
     QByteArray total = outerPadding;
     QByteArray part = innerPadding;
     part.append(baseString);
     total.append(QCryptographicHash::hash(part, QCryptographicHash::Sha1));
     QByteArray hashed = QCryptographicHash::hash(total, QCryptographicHash::Sha1);
     return hashed.toBase64();
    }
    

    What can I do ?

    Thanks :)

    (sorry for my english, I'm french)


  • Lifetime Qt Champion

    Hi and welcome to devnet,

    Are you looking for something like QGoogleAuth ?



  • Thanks for your help.
    I add the file to my project, but there's an error
    Do you want the projet ?

    mainwindow.obj:-1: erreur : LNK2019: unresolved external symbol "__declspec(dllimport) public: static class QString __cdecl QGoogleAuth::generatePin(class QByteArray)" (_imp?generatePin@QGoogleAuth@@SA?AVQString@@VQByteArray@@@Z) referenced in function "private: void __cdecl MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AEAAXXZ)


  • Lifetime Qt Champion

    Did you link your application to the library ?



  • I have to link which library ?
    (Sorry, I'm a novice)


  • Lifetime Qt Champion

    The generated when you build the QGoogleAuth project.



  • I add the ".lib" file, but the error still

    mainwindow.obj:-1: erreur : LNK2019: unresolved external symbol "__declspec(dllimport) public: static class QString __cdecl QGoogleAuth::generatePin(class QByteArray)" (_imp?generatePin@QGoogleAuth@@SA?AVQString@@VQByteArray@@@Z) referenced in function "private: void __cdecl MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AEAAXXZ)


  • Lifetime Qt Champion

    How did you add that file ?



  • Right click on projet,
    Add library
    Extern library
    I select the "qgoogleauth.lib" file :(



  • It's OK, I've found a solution.
    I add all the file of the project, and I do not add library.
    So, it build with my project.

    Thank you very munch for your precious help :)


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