WP::err QCACryptoInterface::decryptAsymmetric(const QByteArray &input, QByteArray &plain,
const QString &privateKey, const SecureArray &keyPassword,
const QString &certificate)
{
QCA::PrivateKey privKey;
QCA::ConvertResult convRes;
privKey = QCA::PrivateKey::fromPEM(privateKey, keyPassword, &convRes);
if (convRes != QCA::ConvertGood) {
std::cout << "Sorry, could not import Private Key" << std::endl;
return (WP::err)convRes;
}
// Read in a matching public key cert
// you could also build this using the fromPEMFile() method
QCA::Certificate pubCert = QCA::Certificate::fromPEM(certificate, &convRes);
if (convRes != QCA::ConvertGood) {
std::cout << "Sorry, could not import public key certificate" << std::endl;
return (WP::err)convRes;
}
// We are building the certificate into a SecureMessageKey object, via a
// CertificateChain
QCA::CertificateChain chain;
chain += pubCert;
QCA::SecureMessageKeyList skeys;
QCA::SecureMessageKey skey;
skey.setX509CertificateChain(chain);
skey.setX509PrivateKey(privKey);
skeys += skey;
QCA::CMS sms;
sms.setPrivateKeys(skeys);
QCA::SecureMessage decryptedMessage(&sms);
decryptedMessage.startDecrypt();
decryptedMessage.update(input);
decryptedMessage.end();
decryptedMessage.waitForFinished(-1);
plain = decryptedMessage.read();
return WP::kOk;
}
WP::err QCACryptoInterface::encyrptAsymmetric(const QByteArray &input, QByteArray &encrypted,
const QString &certificate)
{
// Read in a matching public key cert
// you could also build this using the fromPEMFile() method
QCA::ConvertResult convRes;
QCA::Certificate pubCert = QCA::Certificate::fromPEM(certificate, &convRes);
if (convRes != QCA::ConvertGood) {
std::cout << "Sorry, could not import public key certificate" << std::endl;
return (WP::err)convRes;
}
// 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);
// Now use the SecureMessage object to encrypt the plain text.
msg.startEncrypt();
msg.update(input);
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 (WP::err)msg.errorCode();
}
// get the result
encrypted = msg.read();
return WP::kOk;
}
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( "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( "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;
}