com.itextpdf.signatures

Class ExternalBlankSignatureContainer

java.lang.Object

com.itextpdf.signatures.ExternalBlankSignatureContainer

All Implemented Interfaces:

IExternalSignatureContainer

public class ExternalBlankSignatureContainer
extends Object
implements IExternalSignatureContainer

Produces a blank (or empty) signature. Useful for deferred signing with MakeSignature.signExternalContainer().

Author:

Paulo Soares

Constructor Summary

Constructors

Constructor and Description
ExternalBlankSignatureContainer(com.itextpdf.kernel.pdf.PdfDictionary sigDic) Creates an ExternalBlankSignatureContainer.
ExternalBlankSignatureContainer(com.itextpdf.kernel.pdf.PdfName filter, com.itextpdf.kernel.pdf.PdfName subFilter) Creates an ExternalBlankSignatureContainer.

Method Summary

Modifier and Type	Method and Description
void	modifySigningDictionary(com.itextpdf.kernel.pdf.PdfDictionary signDic) Modifies the signature dictionary to suit the container.
byte[]	sign(InputStream data) Produces the container with the signature.

Methods inherited from class java.lang.Object

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

Constructor Detail

ExternalBlankSignatureContainer

public ExternalBlankSignatureContainer(com.itextpdf.kernel.pdf.PdfDictionary sigDic)

Creates an ExternalBlankSignatureContainer.

Parameters:

sigDic - PdfDictionary containing signature iformation. /SubFilter and /Filter aren't set in this constructor.

ExternalBlankSignatureContainer

public ExternalBlankSignatureContainer(com.itextpdf.kernel.pdf.PdfName filter,
                                       com.itextpdf.kernel.pdf.PdfName subFilter)

Creates an ExternalBlankSignatureContainer. This constructor will create the PdfDictionary for the signature information and will insert the /Filter and /SubFilter values into this dictionary.

Parameters:

filter - PdfName of the signature handler to use when validating this signature

subFilter - PdfName that describes the encoding of the signature

Method Detail

sign

public byte[] sign(InputStream data)
            throws GeneralSecurityException

Description copied from interface: IExternalSignatureContainer

Produces the container with the signature.

Specified by:

sign in interface IExternalSignatureContainer

Parameters:

data - the data to sign

Returns:

a container with the signature and other objects, like CRL and OCSP. The container will generally be a PKCS7 one.

Throws:

GeneralSecurityException

modifySigningDictionary

public void modifySigningDictionary(com.itextpdf.kernel.pdf.PdfDictionary signDic)

Description copied from interface: IExternalSignatureContainer

Modifies the signature dictionary to suit the container. At least the keys PdfName.Filter and PdfName.SubFilter will have to be set.

Specified by:

modifySigningDictionary in interface IExternalSignatureContainer

Parameters:

signDic - the signature dictionary