Question

我使用tiny-AES-c library来加密Qt ByteArray，但加密或解密没有按预期工作，在解密结束时我没有得到未加密的ByteArray。

我使用的代码是：

    void MainWindow::compressImageWithEncryption()
{
    qDebug() << "compressImageWithEncryption";

    //grabbing a screenshot of the desktop
    auto img = QGuiApplication::primaryScreen()->grabWindow(QApplication::desktop()->winId()).toImage();

    //saving the screenshot as a JPG formated byte array
    QByteArray bytes;
    QBuffer buffer(&bytes);
    buffer.open(QIODevice::WriteOnly);
    img.save(&buffer, "JPG");

    //displaying the screenshot to the ui
    auto img_from_bytes = QImage::fromData(bytes, "JPG");
    ui->lblDesktop->setPixmap(QPixmap::fromImage(img_from_bytes));

    //compress the screenshot byte array
    QByteArray compressed_bytes = qCompress(bytes,9);

    //settings encryption key and iv
    const uint8_t key[] = { 0x60, 0x3d, 0xeb, 0x10, 0x15, 0xca, 0x71, 0xbe, 0x2b, 0x73, 0xae, 0xf0, 0x85, 0x7d, 0x77, 0x81,
                      0x1f, 0x35, 0x2c, 0x07, 0x3b, 0x61, 0x08, 0xd7, 0x2d, 0x98, 0x10, 0xa3, 0x09, 0x14, 0xdf, 0xf4 };

    const uint8_t iv[]  = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f };

    //encrypt compressed bytes
    std::vector<uint8_t> encrypted_bytes(compressed_bytes.size());
    auto uint8_compressed_bytes = reinterpret_cast<uint8_t*>(compressed_bytes.data());
    AES_CBC_encrypt_buffer(
                encrypted_bytes.data(),
                uint8_compressed_bytes,
                compressed_bytes.size(),
                key,
                iv
                );
    //ok encryption is done.


    //decrypt compressed bytes
    std::vector<uint8_t> decrypted_bytes(encrypted_bytes.size());
    AES_CBC_encrypt_buffer(
                decrypted_bytes.data(),
                encrypted_bytes.data(),
                encrypted_bytes.size(),
                key,
                iv
                );
    //ok decryption is done.

    //uncompress the encrypted compressed bytes
    auto uncompressed_bytes = qUncompress(reinterpret_cast<const unsigned char*>(decrypted_bytes.data()),decrypted_bytes.size());
    qDebug() << "uncompressed_bytes size:" << uncompressed_bytes.size();

    qDebug() << "compressImageWithEncryption completed";
}

这段代码的作用是它获取桌面的屏幕截图，压缩它，加密它，解密它然后解压缩它。但是在解压缩步骤中我收到错误： qUncompress：Z_DATA_ERROR：输入数据已损坏。我在这做错了什么？您可以从此链接https://www.sendspace.com/file/3j6qbi

下载完整的Qt项目

AES加密和解密会导致数据损坏

0 个答案: