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Showing certificate details in Qt

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Article Metadata
Tested with
Devices(s): Nokia N79, Nokia 5800 XpressMusic
Compatibility
Platform(s): S60 3rd Edition FP2, S60 5th Edition
Symbian
S60 5th Edition
S60 3rd Edition FP2
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.

This page was last modified on 11 October 2012, at 04:18.
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