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: mind_freak (12 Aug 2009)

Introduction

The QCryptographicHash class provides a way to generate cryptographic hashes.

QCryptographicHash can be used to generate cryptographic hashes of binary or text data.

Preconditions

• Download the latest Qt for S60 distribution from Qt.
• Install Qt for S60:Installing Qt on S60
• Check this link for installation guide: How to install the package.
• Go through this article: Getting started with Qt for S60

Some Related Function

• Adds the data to the cryptographic hash.

QByteArray string="Nokia";
hash->addData(string);

• Returns the final hash value.

QByteArray string1=hash->result();

Source Code

Main.cpp

#include <QtGui/QApplication>
#include "textcodec.h"
#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);
    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