Protect PowerPoint Presentations in Java

digitally-sign-pptx.java

// Instantiate a Presentation object that represents a presentation file
Presentation presentation = new Presentation("presentation.pptx");

// Create DigitalSignature object with PFX file and PFX password
DigitalSignature signature = new DigitalSignature("testsignature1.pfx", "testpass1");

// Comment new digital signature
signature.setComments("Aspose.Slides digital signing test.");

// Add digital signature to presentation
presentation.getDigitalSignatures().add(signature);

// Save the PPTX
presentation.save("protected-presentation.pptx", SaveFormat.Pptx);

password-protect-pptx.java

// Instantiate a Presentation object that represents a presentation file
Presentation presentation = new Presentation("presentation.pptx");

// Protect PPTX with password
presentation.getProtectionManager().encrypt("password");

// Save the PPTX
presentation.save("protected-presentation.pptx", SaveFormat.Pptx);

verify-digital-signature.java

// Instantiate a Presentation object that represents a presentation file
Presentation presentation = new Presentation("presentation.pptx");

// Check if digital signatures are available
if (presentation.getDigitalSignatures().size() > 0) {
	boolean allSignaturesAreValid = true;

  // Loop through digital signatures
	for (IDigitalSignature signature : presentation.getDigitalSignatures()) {
		System.out.println(
				signature.getSignTime().toString() + " -- " + (signature.isValid() ? "VALID" : "INVALID"));
		allSignaturesAreValid &= signature.isValid();
	}

	if (allSignaturesAreValid)
		System.out.println("Presentation is genuine, all signatures are valid.");
	else
		System.out.println("Presentation has been modified since signing.");
}

// Save the PPTX
presentation.save("protected-presentation.pptx", SaveFormat.Pptx);