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How to calculate hash for a text using QCryptographicHash in Qt

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== Introduction ==
 
== Introduction ==
The QCryptographicHash class provides a way to generate cryptographic hashes.
+
The QCryptographicHash class provides a way to generate cryptographic hashes from binary or text data.
  
QCryptographicHash can be used to generate cryptographic hashes of binary or text data.
+
For more information, see Wikipedia on http://en.wikipedia.org/wiki/Cryptographic_hash_function
  
This cryptography is used when you want to send any data in secure way to the other.The encrypted text is called chiper text.
 
 
==Preconditions==
 
==Preconditions==
 
* [http://pepper.troll.no/s60prereleases/ Download the latest Qt for S60 distribution from Qt].
 
* [http://pepper.troll.no/s60prereleases/ Download the latest Qt for S60 distribution from Qt].
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== Some Related Function ==
 
== Some Related Function ==
*Adds the data to the cryptographic hash.
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*Adds the data to the cryptographic hash:
 
   
 
   
  QByteArray string="Nokia";
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  QByteArray string = "Nokia";
  hash->addData(string);
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  QCryptographicHash hasher(QCryptographicHash::Sha1);
 +
hasher.addData(string);
  
 
*Returns the final hash value.
 
*Returns the final hash value.
  
  QByteArray string1=hash->result();
+
  QByteArray string1=hasher.result();
  
 
== Source Code ==
 
== Source Code ==
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===Main.cpp===
 
===Main.cpp===
 
<code cpp>
 
<code cpp>
 
 
#include <QtGui/QApplication>
 
#include <QtGui/QApplication>
 
#include "textcodec.h"
 
#include "textcodec.h"
#include<QWidget>
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#include <QWidget>
#include<QHBoxLayout>
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#include <QHBoxLayout>
 
#include <QCryptographicHash>
 
#include <QCryptographicHash>
#include<QString>
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#include <QString>
#include<QByteArray>
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#include <QByteArray>
#include<QLabel>
+
#include <QLabel>
 +
 
 
int main(int argc, char *argv[])
 
int main(int argc, char *argv[])
 
{
 
{

Revision as of 11:14, 28 September 2009

{{{width}}}


Article Metadata
Tested with
Devices(s): S60 Emulator
Compatibility
Platform(s): S60 3rd Edition FP1, S60 3rd Edition FP2, S60 5th Edition
Symbian
Article
Keywords: QCryptographicHash,QByteArray
Created: (10 Apr 2009)
Last edited: User:Mgoetz (28 Sep 2009)

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

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 "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

Crypto.JPG

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