Simple encrypt/decrypt with QCA-BLOWFISH

David_001

Hi there,

i would like to encrypt and decrypt a String with QCA-BLOWFISH but it doesnt work, when i change it to sha my example is working does anyone knows how to do it ?

    //encrypt//
    QString ciphertext = "Hallo wie geht es dir";
    QString password = "!WJKLAS";

    QCA::init();

    QCA::InitializationVector iv(16);
    iv.fill('\0');

    if (!QCA::isSupported("sha256"))  //blowfish-cbc etc. is supported
        throw std::runtime_error("QCA_OSSL_MISSING");

    QCA::SecureArray pw(password.toLocal8Bit());
    QCA::SymmetricKey key(QCA::Hash("sha256").hash(pw));  //blowfish does not work

 //blowfish does not work
    QCA::Cipher *cipher = new QCA::Cipher("aes256", QCA::Cipher::CBC, QCA::Cipher::PKCS7, QCA::Encode, key, iv);
    if (!cipher)
    {
        qDebug() << "ERROR no cipher object";
    }

    QCA::SecureArray encrypted = cipher->process(QCA::SecureArray(ciphertext.toLatin1()));
    bool ok = cipher->ok();
    delete cipher;

    QByteArray cryptedText;
    if (ok) {
        qDebug() << encrypted.toByteArray();
        cryptedText = encrypted.toByteArray();
    }
    else
        qDebug() << QByteArray();


    //decrypt//
    QCA::init();

    QCA::InitializationVector iv2(16);
    iv.fill('\0');

    if (!QCA::isSupported("sha256"))    //blowfish-cbc etc. is supported
        throw std::runtime_error("QCA_OSSL_MISSING");

    QCA::SecureArray pw2(password.toLocal8Bit());
    QCA::SymmetricKey key2(QCA::Hash("sha256").hash(pw));  //blowfish does not work

 //blowfish does not work
    QCA::Cipher *cipher2 = new QCA::Cipher("aes256", QCA::Cipher::CBC, QCA::Cipher::PKCS7, QCA::Decode, key, iv);
    if (!cipher)
    {
        qDebug() << "ERROR no cipher object";
    }

    QCA::SecureArray plain = cipher2->process(QCA::SecureArray(cryptedText));
    bool ok2 = cipher2->ok();
    delete cipher2;

    if (ok2)
        qDebug() << QString::fromUtf8(plain.data());
    else
    {
        qDebug()<<"Error in chipher";
        qDebug() <<  QString();
    }

JonB

@David_001 said in Simple encrypt/decrypt with QCA-BLOWFISH:

but it doesnt work

What does this mean?

QCA::SymmetricKey key(QCA::Hash("sha256").hash(pw)); //blowfish does not work

What does this mean? Is it that if you replace "sha56" by "blowfish" your machine switches off on this line?

David_001

i get an segmentation fault on this line, when i use blowfish, blowfish-cbc oder blowfish-cfb

    //encrypt//
    QString ciphertext = "Hallo wie geht es dir";
    QString password = "!WJKLAS";
    QByteArray temp = ciphertext.toUtf8().data();

    while ((temp.length() % 8) != 0)
        temp.append('\0');

    QCA::init();

    QCA::InitializationVector iv(8);
    iv.fill('\0');

    if (!QCA::isSupported("blowfish-cbc"))
        throw std::runtime_error("QCA_PSSL_MISSING");

    QCA::SecureArray pw(password.toLocal8Bit());
    QCA::SymmetricKey key(QCA::Hash("sha256").hash(pw));

    QCA::Cipher *cipher = new QCA::Cipher("blowfish", QCA::Cipher::CBC, QCA::Cipher::NoPadding, QCA::Encode, key.toByteArray(), iv);
    if (!cipher)
    {
        qDebug() << "ERROR no cipher object";
    }

    QCA::SecureArray encrypted = cipher->process(QCA::SecureArray(temp));
    bool ok = cipher->ok();
    delete cipher;

    QByteArray cryptedText;
    if (ok) {
        qDebug() << encrypted.toByteArray();
        cryptedText = encrypted.toByteArray();
    }
    else
        qDebug() << QByteArray();


    //decrypt//
    QCA::init();

    QCA::InitializationVector iv2(8);
    iv.fill('\0');

    if (!QCA::isSupported("blowfish-cbc"))
        throw std::runtime_error("QCA_PSSL_MISSING");

    QCA::SecureArray pw2(password.toLocal8Bit());
    QCA::SymmetricKey key2(QCA::Hash("sha256").hash(pw));

    QCA::Cipher *cipher2 = new QCA::Cipher("blowfish", QCA::Cipher::CBC, QCA::Cipher::NoPadding, QCA::Decode, key, iv);
    if (!cipher)
    {
        qDebug() << "ERROR no cipher object";
    }

    QCA::SecureArray plain = cipher2->process(QCA::SecureArray(cryptedText));
    bool ok2 = cipher2->ok();
    delete cipher2;

    if (ok2)
        qDebug() << QString::fromUtf8(plain.data());
    else
    {
        qDebug()<<"Error in chipher";
        qDebug() <<  QString();
    }

This code seems to run => output:
"\x8D\x92\x16\x93'\xA9\r\x18\xE4\xD3Jf\xD8\xA0k@\x94\x95\f4\xDCrSB"
"Hallo wie geht es dir"

But seems not correct