Microsoft PowerPoint is a powerful and feature-rich software that allows you to create stunning slides to use in your meetings and discussions. You might find yourself in situations where your presentation contains confidential information that you want to guard. In such cases, protecting the presentation file with a password can prove to be helpful. On the other hand, if you want to mark a presentation as final and do not want its contents to be modified, you can digitally sign the presentation file. As long as the signature is valid, you can be confident that the presentation file has not been altered. In light of that, this article will teach you how to protect PowerPoint presentations with a password or digital signature using C++.
- C++ API to Protect PowerPoint Files
- Protect PowerPoint Files with a Password
- Protecting PowerPoint Files with a Digital Signature
- Verify Digitally Signed PowerPoint Files using C++
- Get a Free License
C++ API to Protect PowerPoint Files
Aspose.Slides for C++ is a feature-rich C++ library that allows you to create, read, and modify PowerPoint files. Furthermore, the API supports protecting PowerPoint files using passwords and digital signatures. You can either install the API through NuGet or download it directly from the Downloads section.
PM> Install-Package Aspose.Slides.CppProtect PowerPoint Files with a Password
The following are the steps to protect PowerPoint presentations with a password.
- Firstly, load the PowerPoint file using the Presentation class.
- Encrypt the presentation with password using the Presentation->get_ProtectionManager()->Encrypt (System::String encryptionPassword) method.
- Finally, save the protected presentation using the Presentation->Save (System::String name, Export::SaveFormat format) method.
The following is the sample code to protect PowerPoint presentation with a password using C++.
Protecting PowerPoint Files with a Digital Signature
The following are the steps to protect PowerPoint presentations with a digital signature.
- Firstly, load the PowerPoint presentation using the Presentation class.
- Create an object of the DigitalSignature class using a certificate file and password.
- Add comments using the DigitalSignature->set_Comments (System::String value) method.
- Add the digital signature to the presentation using the Presentation->get_DigitalSignatures()->Add (System::SharedPtr<IDigitalSignature> digitalSignature) method.
- Finally, save the signed presentation using the Presentation->Save (System::String name, Export::SaveFormat format) method.
The following is the sample code to protect PowerPoint files with a digital signature using C++.
Verify Digitally Signed PowerPoint Files using C++
Aspose.Slides for C++ API also provides you with the ability to verify digitally signed PowerPoint files. The following are the steps to verify the digital signature of a PowerPoint file.
- Load the PowerPoint presentation using the Presentation class.
- Check for the presence of digital signatures using Presentation->get_DigitalSignatures()->get_Count() method.
- If the presentation contains digital signatures, loop through them.
- Within the loop, access each digital signature using Presentation->get_DigitalSignatures()->idx_get (int32_t index) method.
- Check the validity of the digital signature using the DigitalSignature->get_IsValid() method that returns true for valid signatures.
The following is the sample code to verify the digital signature of a PowerPoint file using C++.
Get a Free License
You can try the API without evaluation limitations by requesting a free temporary license.
Conclusion
In this article, you have learned how to protect PowerPoint presentations with a password and digital signature using C++. Furthermore, you have seen how to verify the integrity of presentation files by validating their digital signature. Aspose.Slides for C++ API has a lot more features that make working with presentation files a breeze. You can explore the API in detail by using the official documentation. In case of any questions, please feel free to contact us on the free support forum.
