com.aspose.slides

Class DigitalSignature

java.lang.Object

com.aspose.slides.DigitalSignature

All Implemented Interfaces:

IDigitalSignature

public class DigitalSignature
extends java.lang.Object
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();
 }
 
 

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
byte[]	getCertificate() Certificate object that was used to sign the document.
java.lang.String	getComments() The purpose of signature.
java.util.Date	getSignTime() The time when the document was signed.
boolean	isValid() If this digital signature is valid and the document has not been tampered with, this value will be true.
void	setComments(java.lang.String value) The purpose of signature.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

DigitalSignature

public DigitalSignature(byte[] certData,
                        java.lang.String password)

Creates a new DigitalSignature object with the specified certificate.

Parameters:

certData - a byte array containing the certificate

password - Password required to access certificate.

DigitalSignature

public DigitalSignature(java.lang.String filePath,
                        java.lang.String password)

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

Parameters:

filePath - Path to the file with certificate.

password - Password required to access certificate.

Method Detail

getCertificate

public final byte[] getCertificate()

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

Specified by:

getCertificate in interface IDigitalSignature

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();
 }
 
 

Specified by:

isValid in interface IDigitalSignature

getSignTime

public final java.util.Date getSignTime()

The time when the document was signed. Read-only 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();
 }
 
 

Specified by:

getSignTime in interface IDigitalSignature

getComments

public final java.lang.String getComments()

The purpose of signature. Read/write String.

Specified by:

getComments in interface IDigitalSignature

setComments

public final void setComments(java.lang.String value)

The purpose of signature. Read/write String.

Specified by:

setComments in interface IDigitalSignature