Package com.itextpdf.signatures

Class PdfTwoPhaseSigner

java.lang.Object
com.itextpdf.signatures.PdfTwoPhaseSigner
public class PdfTwoPhaseSigner extends Object
Class that prepares document and adds the signature to it while performing signing operation in two steps (see PadesTwoPhaseSigningHelper for more info).

Firstly, this class allows to prepare the document for signing and calculate the document digest to sign. Secondly, it adds an existing signature to a PDF where space was already reserved.

  • Constructor Details

  • Method Details

    • prepareDocumentForSignature

      public byte[] prepareDocumentForSignature (SignerProperties signerProperties, String digestAlgorithm, PdfName filter, PdfName subFilter, int estimatedSize, boolean includeDate) throws IOException, GeneralSecurityException
      Prepares document for signing, calculates the document digest to sign and closes the document.
      Parameters:
      signerProperties - SignerProperties properties to be used for main signing operation
      digestAlgorithm - the algorithm to generate the digest with
      filter - PdfName of the signature handler to use when validating this signature
      subFilter - PdfName that describes the encoding of the signature
      estimatedSize - the estimated size of the signature, this is the size of the space reserved for the Cryptographic Message Container
      includeDate - specifies if the signing date should be set to the signature dictionary
      Returns:
      the message digest of the prepared document.
      Throws:
      IOException - if some I/O problem occurs.
      GeneralSecurityException - if some problem during apply security algorithms occurs.

    • addSignatureToPreparedDocument

      public static void addSignatureToPreparedDocument (PdfDocument document, String fieldName, OutputStream outs, CMSContainer cmsContainer) throws IOException, GeneralSecurityException
      Adds an existing signature to a PDF where space was already reserved.
      Parameters:
      document - the original PDF
      fieldName - the field to sign. It must be the last field
      outs - the output PDF
      cmsContainer - the finalized CMS container
      Throws:
      IOException - if some I/O problem occurs.
      GeneralSecurityException - if some problem during apply security algorithms occurs.

    • addSignatureToPreparedDocument

      public static void addSignatureToPreparedDocument (PdfDocument document, String fieldName, OutputStream outs, byte[] signedContent) throws IOException, GeneralSecurityException
      Adds an existing signature to a PDF where space was already reserved.
      Parameters:
      document - the original PDF
      fieldName - the field to sign. It must be the last field
      outs - the output PDF
      signedContent - the bytes for the signed data
      Throws:
      IOException - if some I/O problem occurs.
      GeneralSecurityException - if some problem during apply security algorithms occurs.

    • setExternalDigest

      public PdfTwoPhaseSigner setExternalDigest (IExternalDigest externalDigest)
      Use the external digest to inject specific digest implementations
      Parameters:
      externalDigest - the IExternalDigest instance to use to generate Digests
      Returns:
      same instance of PdfTwoPhaseSigner

    • setStampingProperties

      public PdfTwoPhaseSigner setStampingProperties (StampingProperties stampingProperties)
      Set stamping properties to be used during main signing operation.

      If none is set, stamping properties with append mode enabled will be used

      Parameters:
      stampingProperties - StampingProperties instance to be used during main signing operation
      Returns:
      same instance of PdfTwoPhaseSigner