Showing certificate details in Qt

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Article Metadata

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Tested with

Devices(s): Nokia N79, Nokia 5800 XpressMusic

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Compatibility

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

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Article

Keywords: QSslCertificate, Certificate

Created: User:Kbwiki (14 Dec 2009)

Last edited: hamishwillee (11 Oct 2012)

Description

This article provides a way for a Qt application to display certificate information such as issuer info or expiry date.

Solution

The QSslCertificate class can be used to display the information of an X509 certificate. The type can be either DER or PEM. Required headers and module

 //QT += network
 #include <QSslCertificate>
 #include <QSslKey>

Displaying certificate information

 // Selecting a certificate from the file dialog
 QString crtFilename = QFileDialog::getOpenFileName(this,QString()
 ,tr("Certificate Files (*.der *.pem)"));
 QFile crtFile(crtFilename);
 if(!crtFile.open(QIODevice::ReadOnly))
  {
   return ;
  }
 else
  {
   if(crtFilename.contains(".der"))
    {
     // Loading DER certificate
     iCrt = new QSslCertificate(&crtFile,QSsl::Der);
    }
   else
    {
     // Loading PEM certificate
     iCrt = new QSslCertificate(&crtFile,QSsl::Pem);
    }
   QStringList issuerInfo;
   //Fetchin the issuer info
   issuerInfo.append(iCrt->issuerInfo(QSslCertificate::Organization));
   issuerInfo.append(iCrt->issuerInfo(QSslCertificate::CountryName));
   issuerInfo.append(iCrt->issuerInfo(QSslCertificate::LocalityName));
   //Fetching effective and expiry dates
   QString effDate;
   QString xDate;
   effDate.append(iCrt->effectiveDate().toString());
   xDate.append(iCrt->expiryDate().toString());
   //Fetching the serial number
   QString serial;
   serial.append(iCrt->serialNumber());
   //Checking whether the certificate is valid or not
   bool isValid = iCrt-> isValid();
   //Fetching the public key
   QSslKey pubKey;
   pubKey = iCrt->publicKey();
   QString algo;
   //Fetching the algorithm
   if(pubKey.algorithm() == QSsl::Rsa)
    {
     algo.append("RSA");
    }
   else
    {
     algo.append("DSA");
    }
  }

Note

We can get a handle to the certificate using QSslCertificate::handle() to access extended information about the certificate.