How to calculate hash for a text using QCryptographicHash in Qt

Article Metadata

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Tested with

Devices(s): S60 Emulator

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Compatibility

Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition

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Article

Keywords: QCryptographicHash,QByteArray

Created: (10 Apr 2009)

Last edited: kiran10182 (01 Apr 2011)

Introduction

The QCryptographicHash class provides a way to generate cryptographic hashes from binary or text data.

For more information, see Wikipedia on http://en.wikipedia.org/wiki/Cryptographic_hash_function

Preconditions

• Download and Install latest version Qt for Symbian - Installation packages which has links on how to install the latest version

Some Related Function

• Adds the data to the cryptographic hash:

QByteArray string = "Nokia";
QCryptographicHash hasher(QCryptographicHash::Sha1);
hasher.addData(string);

• Returns the final hash value.

QByteArray string1=hasher.result();

Source Code

Main.cpp

#include <QtGui/QApplication>
#include <QWidget>
#include <QHBoxLayout>
#include <QCryptographicHash>
#include <QString>
#include <QByteArray>
#include <QLabel>
 
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QWidget *win=new QWidget();
    QHBoxLayout *lay=new QHBoxLayout();
    QLabel *lbl=new QLabel();
    QLabel *lbl1=new QLabel("Encrypted Text:");
    lbl1->setBuddy(lbl);
    QByteArray string="Nokia";
    QCryptographicHash *hash=new QCryptographicHash(QCryptographicHash::Md4);
    hash->addData(string);
    QByteArray string1=hash->result();
    lbl->setText(string1); // TODO: use e.g. toHex or toBase64
    lay->addWidget(lbl1);
    lay->addWidget(lbl);
    win->setLayout(lay);
    win->setStyleSheet("* { background-color:rgb(199,147,88); padding: 7px ;   color:rgb(255,255,255)}");
    win->showMaximized();
    return a.exec();
}

ScreenShot

More About QCryptographicHash