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Revision as of 01:17, 11 October 2012 by hamishwillee (Talk | contribs)

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How to calculate hash for a text using QCryptographicHash in Qt

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This code snippet shows how to calculate hash for a text string using QCryptographicHash.

Article Metadata
Code ExampleTested with
Devices(s): Nokia C5-00S60, Emulator, Simulator
Compatibility
Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition, Symbian^3, Qt 4.6, Qt 4.7
Symbian
Device(s): All which support Qt
Article
Keywords: QCryptographicHash
Created: mind_freak (10 Apr 2009)
Updated: vineet.jain (24 Feb 2012)
Reviewed: NegInfinity (15 Sep 2011)
Last edited: hamishwillee (11 Oct 2012)


Contents

Source Code

Main.cpp

#include <QtGui/QApplication>
#include "qmlapplicationviewer.h"
#include <QCryptographicHash>
#include "QDeclarativeContext"
#include "hashcalculate.h"
 
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
 
HashCalculate*ihashcalc = new HashCalculate();
QmlApplicationViewer viewer;
viewer.setOrientation(QmlApplicationViewer::ScreenOrientationAuto);
QDeclarativeContext *ctxt = viewer.rootContext();
ctxt->setContextProperty("myContextProperty",ihashcalc);
viewer.setMainQmlFile(QLatin1String("qml/MD4HashSample/main.qml"));
viewer.showExpanded();
return app.exec();
}

hashcalculate.cpp

#include "hashcalculate.h"
#include <QCryptographicHash>
#include "QDebug"
HashCalculate::HashCalculate(QObject *parent) :
QObject(parent)
{
iHashValue = "";
}
 
void HashCalculate::calculateHash(const QString& aOriginalText )
{
QCryptographicHash hash(QCryptographicHash::Md4);
hash.addData(aOriginalText.toUtf8());
SetHash(QString(hash.result().toHex()));
//qDebug() << QString(hash.result().toHex());
}
 
void HashCalculate::SetHash(const QString& aHashValue)
{
iHashValue = aHashValue;
}
 
QString HashCalculate::getHash()
{
return iHashValue;
}

hashcalculate.h

#ifndef HASHCALCULATE_H
#define HASHCALCULATE_H
 
#include <QObject>
 
class HashCalculate : public QObject
{
Q_OBJECT
public:
explicit HashCalculate(QObject *parent = 0);
Q_INVOKABLE void calculateHash(const QString& aOriginalText );
 
signals:
 
public slots:
QString getHash();
void SetHash(const QString& aHashValue);
public:
QString iHashValue;
 
};
 
#endif // HASHCALCULATE_H

Main.qml

import QtQuick 1.0
import com.nokia.symbian 1.0
 
Window {
id: window
 
StatusBar {
id: statusBar
anchors.top: window.top
}
 
PageStack {
id: pageStack
anchors { left: parent.left; right: parent.right; top: statusBar.bottom; bottom: toolBar.top }
}
 
ToolBar {
id: toolBar
anchors.bottom: window.bottom
tools: ToolBarLayout {
id: toolBarLayout
ToolButton {
flat: true
iconSource: "toolbar-back"
onClicked: pageStack.depth <= 1 ? Qt.quit() : pageStack.pop()
}
}
}
 
Component.onCompleted: {
pageStack.push(Qt.resolvedUrl("MainPage.qml"))
}
}

MainPage.qml

import QtQuick 1.0
import com.nokia.symbian 1.0
 
Page {
id: mainPage
 
Text {
text: qsTr("Enter Text:")
id:textorg
color: platformStyle.colorNormalLight
font.pixelSize: 20
x:text_originaltxt.x
y:text_originaltxt.y-45
}
 
Text {
text: qsTr("MD4 Hash :")
id: txthshd
color: platformStyle.colorNormalLight
font.pixelSize: 20
x:text_hashedtxt.x
y:text_hashedtxt.y-40
 
}
 
TextField {
id: text_originaltxt
x: parent.x+5
y:parent.y+55
width: parent.width-15
text : "Nokia"
 
}
TextField {
id: text_hashedtxt
x: text_originaltxt.x
y:text_originaltxt.y+110
width: parent.width-15
readOnly: true
text : ""
 
}
 
Button {
id: btnhash
x:parent.x+50
y:text_hashedtxt.y+text_hashedtxt.height+txthshd.height+5
text: "Get Hash"
onClicked: {
myContextProperty.calculateHash(text_originaltxt.text)
text_hashedtxt.text = myContextProperty.getHash()
}
}
Button {
id: btnclr
x:parent.x+btnhash.width+130
y:text_hashedtxt.y+text_hashedtxt.height+txthshd.height+5
text: "Clear"
onClicked: {
text_originaltxt.text = ""
text_hashedtxt.text = ""
}
}
 
}

ScreenShots

MD4HashBlank.jpg MD4Hashenter.jpg MD4Hash1.jpg

About the Update

The implementation has now been converted using the Qt Quick components.As compared with the previous functionality in which a hard-coded text was getting converted into a hash, now the user has flexibility to enter any text & convert it into a hash code as visible in the screenshots.

Source Code

Full source code can be downloaded from here : Media:MD4HashSample.zip

This page was last modified on 11 October 2012, at 01:17.
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