DigitalSignature

Inheritance: java.lang.Object

All Implemented Interfaces: com.aspose.slides.IDigitalSignature

public class DigitalSignature implements IDigitalSignature

Digital signature in signed file.

---

The following example demonstrates how to add digital signature from a PFX certificate in PowerPoint Presentation.
 
 // Initialize Presentation instance
 Presentation pres = new Presentation();
 try {
    // 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
     pres.getDigitalSignatures().add(signature);
     // Save presentation
     pres.save("SomePresentationSigned.pptx", SaveFormat.Pptx);
 } finally {
     if (pres != null) pres.dispose();
 }
 
 The following sample code demonstrates how to validate digital signature of PowerPoint Presentation.
 
 // Initialize Presentation instance
 Presentation pres = new Presentation("SomePresentationSigned.pptx");
 try {
     if (pres.getDigitalSignatures().size() > 0)
     {
         boolean allSignaturesAreValid = true;
         System.out.println("Signatures used to sign the presentation: ");
         // Check if all digital signatures are valid
         for (IDigitalSignature signature : pres.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.");
     }
 } finally {
     if (pres != null) pres.dispose();
 }

Constructors

Constructor	Description
DigitalSignature(byte[] certData, String password)	Creates a new DigitalSignature object with the specified certificate.
DigitalSignature(String filePath, String password)	Creates a new DigitalSignature object with the specified certificate file path and password.

Methods

Method	Description
getCertificate()	Certificate object that was used to sign the document.
isValid()	If this digital signature is valid and the document has not been tampered with, this value will be true.
getSignTime()	The time when the document was signed.
getComments()	The purpose of signature.
setComments(String value)	The purpose of signature.

DigitalSignature(byte[] certData, String password)

public DigitalSignature(byte[] certData, String password)

Creates a new DigitalSignature object with the specified certificate.

Parameters:

Parameter	Type	Description
certData	byte[]	a byte array containing the certificate
password	java.lang.String	Password required to access certificate.

DigitalSignature(String filePath, String password)

public DigitalSignature(String filePath, String password)

Creates a new DigitalSignature object with the specified certificate file path and password.

Parameters:

Parameter	Type	Description
filePath	java.lang.String	Path to the file with certificate.
password	java.lang.String	Password required to access certificate.

getCertificate()

public final byte[] getCertificate()

Certificate object that was used to sign the document. Read-only byte[].

Returns: byte[]

isValid()

public final boolean isValid()

If this digital signature is valid and the document has not been tampered with, this value will be true. Read-only boolean.

---

Presentation pres = new Presentation("SomePresentationSigned.pptx");
 try
 {
     for (IDigitalSignature signature : pres.getDigitalSignatures())
         System.out.println("Signature check: " + (signature.isValid() ? "VALID" : "INVALID"));
 } finally {
     if (pres != null) pres.dispose();
 }

Returns: boolean

getSignTime()

public final Date getSignTime()

The time when the document was signed. Read-only java.util.Date.

---

Presentation pres = new Presentation("SomePresentationSigned.pptx");
 try
 {
     for (IDigitalSignature signature : pres.getDigitalSignatures())
         System.out.println("Signature check: " + (signature.isValid() ? "VALID" : "INVALID") + ", Signing time: " + signature.getSignTime());
 } finally {
     if (pres != null) pres.dispose();
 }

Returns: java.util.Date

getComments()

public final String getComments()

The purpose of signature. Read/write String.

Returns: java.lang.String

setComments(String value)

public final void setComments(String value)

The purpose of signature. Read/write String.

Parameters:

Parameter	Type	Description
value	java.lang.String