WP::err QCACryptoInterface::generateKeyPair(QString &certificate, QString &publicKey,
QString &privateKey,
const SecureArray &keyPassword)
{
if(!QCA::isSupported("pkey") || !QCA::PKey::supportedIOTypes().contains(QCA::PKey::RSA)) {
qDebug() << "RSA not supported!\n";
return WP::kError;
}
QCA::PrivateKey secretKey = QCA::KeyGenerator().createRSA(2048);
if(secretKey.isNull()) {
qDebug() << "Failed to make private RSA key\n";
return WP::kError;
}
privateKey = secretKey.toPEM(keyPassword);
// public
QCA::CertificateOptions opts;
QCA::Certificate cert(opts, secretKey);
certificate = cert.toPEM();
QCA::PublicKey pubkey = secretKey.toPublicKey();
publicKey = pubkey.toPEM();
return WP::kOk;
}
void QCACryptoInterface::generateDHParam(QString &prime, QString &base, QString &secret, QString &pub)
{
QCA::KeyGenerator generator;
QCA::DLGroup group = generator.createDLGroup(QCA::DSA_512);
prime = group.p().toString();
base = group.g().toString();
QCA::PrivateKey privateKey = generator.createDH(group);
secret = privateKey.toDH().x().toString();
pub = privateKey.toDH().y().toString();
}
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;
}
WP::err QCACryptoInterface::sign(const QByteArray &input, QByteArray &signature,
const QString &privateKeyString, const SecureArray &keyPassword)
{
QCA::PrivateKey privateKey;
QCA::ConvertResult convRes;
privateKey = QCA::PrivateKey::fromPEM(privateKeyString, keyPassword, &convRes);
if (convRes != QCA::ConvertGood) {
std::cout << "Sorry, could not import Private Key" << std::endl;
return WP::kError;
}
if(!privateKey.canSign()) {
std::cout << "Error: this kind of key cannot sign" << std::endl;
return WP::kError;
}
privateKey.startSign(QCA::EMSA3_MD5);
privateKey.update(input);
signature = privateKey.signature();
return WP::kOk;
}
void QCACryptoInterface::generateKeyPair(const char* certificateFile, const char *publicKeyFile, const char *privateKeyFile, const char *keyPassword)
{
if(!QCA::isSupported("pkey") || !QCA::PKey::supportedIOTypes().contains(QCA::PKey::RSA)) {
qDebug() << "RSA not supported!\n";
return;
}
QCA::PrivateKey secretKey = QCA::KeyGenerator().createRSA(2048);
if(secretKey.isNull()) {
qDebug() << "Failed to make private RSA key\n";
return;
}
secretKey.toPEMFile(privateKeyFile, keyPassword);
// public
QCA::CertificateOptions opts;
QCA::Certificate cert(opts, secretKey);
cert.toPEMFile(certificateFile);
QCA::PublicKey pubkey = secretKey.toPublicKey();
pubkey.toPEMFile(publicKeyFile);
}
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;
}
