QCA

keyloader.cpp

The code below shows how to load a private key from a PEM format file, including handling any requirement for a passphrase. This is done using the QCA::KeyLoader class.

/*
Copyright (C) 2007 Justin Karneges <[email protected]>
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
// QtCrypto has the declarations for all of QCA
#include <QtCrypto>
#include <QCoreApplication>
#include <QFile>
#include <QTimer>
#include <cstdio>
#ifdef QT_STATICPLUGIN
#include "import_plugins.h"
#endif
class PassphraseHandler : public QObject
{
public:
PassphraseHandler(QObject *parent = nullptr)
{
connect(&handler, &QCA::EventHandler::eventReady, this, &PassphraseHandler::eh_eventReady);
handler.start();
}
private Q_SLOTS:
void eh_eventReady(int id, const QCA::Event &event)
{
if (event.type() == QCA::Event::Password) {
prompt.getHidden(QStringLiteral("Passphrase"));
prompt.waitForFinished();
pass = prompt.result();
handler.submitPassword(id, pass);
} else
handler.reject(id);
}
};
class App : public QObject
{
public:
QCA::KeyLoader keyLoader;
QString str;
App()
{
connect(&keyLoader, &QCA::KeyLoader::finished, this, &App::kl_finished);
}
public Q_SLOTS:
void start()
{
keyLoader.loadPrivateKeyFromPEMFile(str);
}
void quit();
private Q_SLOTS:
void kl_finished()
{
if (keyLoader.convertResult() == QCA::ConvertGood) {
QCA::PrivateKey key = keyLoader.privateKey();
printf("Loaded successfully. Bits: %d\n", key.bitSize());
} else
printf("Unable to load.\n");
emit quit();
}
};
int main(int argc, char **argv)
{
QCoreApplication qapp(argc, argv);
if (argc < 2) {
printf("usage: keyloader [privatekey.pem]\n");
return 0;
}
PassphraseHandler passphraseHandler;
App app;
app.str = QFile::decodeName(argv[1]);
QObject::connect(&app, &App::quit, &qapp, QCoreApplication::quit);
qapp.exec();
return 0;
}
#include "keyloader.moc"
Q_OBJECTQ_OBJECT
Q_SLOTSQ_SLOTS
PrivateKey privateKey() const
The private key that has been loaded.
QCA_EXPORT void init()
Initialise QCA.
Q_SCRIPTABLE Q_NOREPLY void start()
int bitSize() const
Report the number of bits in the key.
SecureArray result() const
Obtain the result of the user input.
QMetaObject::Connection connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)
void waitForFinished()
Block waiting for user input.
QObject(QObject *parent)
void getHidden(const QString &promptStr)
Allow the user to enter data without it being echo'd to the terminal.
virtual bool event(QEvent *e)
@ Password
Asking for a password, PIN or passphrase.
Definition: qca_core.h:1400
AKONADI_CALENDAR_EXPORT KCalendarCore::Event::Ptr event(const Akonadi::Item &item)
void reject(int id)
function to call to indicate that the user declined to provide a password, passphrase,...
void submitPassword(int id, const SecureArray &password)
function to call to return the user provided password, passphrase or PIN.
void start()
mandatory function to call after connecting the signal to a slot in your application specific passwor...
Q_SIGNALSQ_SIGNALS
const QList< QKeySequence > & quit()
ConvertResult convertResult() const
The result of the loading process.
void finished()
Signal that is emitted when the load process has completed.
void eventReady(int id, const QCA::Event &context)
signal emitted when an Event requires attention.
@ ConvertGood
Conversion succeeded, results should be valid.
void loadPrivateKeyFromPEMFile(const QString &fileName)
Initiate an asynchronous loading of a PrivateKey from a PEM format file.
QObject * parent() const const
QString decodeName(const QByteArray &localFileName)
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