C++ (Cpp) PrivateKey::canDecrypt Examples

Example #1

File: encryption-ng-simlite-decryptor.cpp Project: partition/kadu

QCA::PrivateKey EncryptioNgSimliteDecryptor::getPrivateKey(const Key &key)
{
	QByteArray keyData = key.key().toByteArray().trimmed();
	if (!keyData.startsWith(BEGIN_RSA_PRIVATE_KEY) || !keyData.endsWith(END_RSA_PRIVATE_KEY))
	{
		Valid = false;
		return QCA::PrivateKey();
	}

	keyData = keyData.mid(BEGIN_RSA_PRIVATE_KEY_LENGTH, keyData.length() - BEGIN_RSA_PRIVATE_KEY_LENGTH - END_RSA_PRIVATE_KEY_LENGTH).replace('\r', "").trimmed();

	QCA::SecureArray certificate;

	QCA::Base64 decoder;
	decoder.setLineBreaksEnabled(true);
	certificate = decoder.decode(keyData);

	// just some fake security added
	keyData.fill(' ', keyData.size());
	keyData.clear();

	if (!decoder.ok())
	{
		Valid = false;
		return QCA::PrivateKey();
	}

	PKCS1Certificate::ConversionStatus status;
	PKCS1Certificate pkcs1;

	QCA::PrivateKey privateKey = pkcs1.privateKeyFromDER(certificate, status);
	if (PKCS1Certificate::OK != status)
	{
		Valid = false;
		return QCA::PrivateKey();
	}

	if (!privateKey.canDecrypt())
	{
		Valid = false;
		return QCA::PrivateKey();
	}

	Valid = true;
	return privateKey;
}

Example #2

File: publickeyexample.cpp Project: digideskio/qca

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;
}