Warning, file /libraries/qca/examples/publickeyexample/publickeyexample.cpp was not indexed or was modified since last indexation (in which case cross-reference links may be missing, inaccurate or erroneous).

 /*
  Copyright (C) 2003 Justin Karneges <justin@affinix.com>
  Copyright (C) 2005 Brad Hards <bradh@frogmouth.net>
 
  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.
 */
 
 #include <QtCrypto>
 
 #include <QCoreApplication>
 
 #include <iostream>
 
 #ifdef QT_STATICPLUGIN
 #include "import_plugins.h"
 #endif
 
 int main(int argc, char **argv)
 {
     // the Initializer object sets things up, and
     // also does cleanup when it goes out of scope
     QCA::Initializer init;
 
     QCoreApplication app(argc, argv);
 
     // We need to ensure that we have certificate handling support
     if (!QCA::isSupported("cert")) {
         std::cout << "Sorry, no PKI certificate support" << std::endl;
         return 1;
     }
 
     // Read in a private key
     QCA::PrivateKey    privKey;
     QCA::ConvertResult convRes;
     QCA::SecureArray   passPhrase = "start";
     privKey                       = QCA::PrivateKey::fromPEMFile(QStringLiteral("Userkey.pem"), passPhrase, &convRes);
     if (convRes != QCA::ConvertGood) {
         std::cout << "Sorry, could not import Private Key" << std::endl;
         return 1;
     }
 
     // Read in a matching public key cert
     // you could also build this using the fromPEMFile() method
     QCA::Certificate pubCert(QStringLiteral("User.pem"));
     if (pubCert.isNull()) {
         std::cout << "Sorry, could not import public key certificate" << std::endl;
         return 1;
     }
     // We are building the certificate into a SecureMessageKey object, via a
     // CertificateChain
     QCA::SecureMessageKey secMsgKey;
     QCA::CertificateChain chain;
     chain += pubCert;
     secMsgKey.setX509CertificateChain(chain);
 
     // build up a SecureMessage object, based on our public key certificate
     QCA::CMS           cms;
     QCA::SecureMessage msg(&cms);
     msg.setRecipient(secMsgKey);
 
     // Some plain text - we use the first command line argument if provided
     QByteArray plainText = (argc >= 2) ? argv[1] : "What do ya want for nuthin'";
 
     // Now use the SecureMessage object to encrypt the plain text.
     msg.startEncrypt();
     msg.update(plainText);
     msg.end();
     // I think it is reasonable to wait for 1 second for this
     msg.waitForFinished(1000);
 
     // check to see if it worked
     if (!msg.success()) {
         std::cout << "Error encrypting: " << msg.errorCode() << std::endl;
         return 1;
     }
 
     // get the result
     QCA::SecureArray cipherText = msg.read();
     QCA::Base64      enc;
     std::cout << plainText.data() << " encrypts to (in base 64): ";
     std::cout << qPrintable(enc.arrayToString(cipherText)) << std::endl;
 
     // Show we can decrypt it with the private key
     if (!privKey.canDecrypt()) {
         std::cout << "Private key cannot be used to decrypt" << std::endl;
         return 1;
     }
     QCA::SecureArray plainTextResult;
     if (0 == privKey.decrypt(cipherText, &plainTextResult, QCA::EME_PKCS1_OAEP)) {
         std::cout << "Decryption process failed" << std::endl;
         return 1;
     }
 
     std::cout << qPrintable(enc.arrayToString(cipherText));
     std::cout << " (in base 64) decrypts to: ";
     std::cout << plainTextResult.data() << std::endl;
 
     return 0;
 }