Examples of org.pdfbox.pdmodel.encryption.PDEncryptionDictionary

org.pdfbox.pdmodel.encryption.PDEncryptionDictionary
This class is a specialized view of the encryption dictionary of a PDF document. It contains a low level dictionary (COSDictionary) and provides the methods to manage its fields. The available fields are the ones who are involved by standard security handler and public key security handler. @author Ben Litchfield @author Benoit Guillon (benoit.guillon@snv.jussieu.fr) @version $Revision: 1.7 $

    {    
        if( encParameters == null ) 
        {
            if( isEncrypted() )
            {
                encParameters = new PDEncryptionDictionary(document.getEncryptionDictionary());
            }
            else
            {
                encParameters = new PDEncryptionDictionary();
            }
        }
        return encParameters;               
    }

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     * @throws CryptographyException If there is an error during decryption.
     */    
    public void openProtection(DecryptionMaterial pm) 
        throws BadSecurityHandlerException, IOException, CryptographyException 
    {
        PDEncryptionDictionary dict = this.getEncryptionDictionary();
        if(dict.getFilter() != null)
        {
            SecurityHandler handler = SecurityHandlersManager.getInstance().getSecurityHandler(dict.getFilter());
            securityHandler = handler;
            handler.decryptDocument(this, pm);
            document.dereferenceObjectStreams();
        }
        else

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          bitValue = EXTRACT_FOR_ACCESSIBILITY_BIT;
        else
          throw new IllegalArgumentException("Unknown pdf permission: " + permission);


        
        final PDEncryptionDictionary info;
    try {
      info = (PDEncryptionDictionary) getPDFDocument().getEncryptionDictionary();
    }
    catch (final IOException e)
    {
      throw new RuntimeException("Can't read permissions", e);
    }
        return (info.getPermissions() & (1 << (bitValue-1))) != 0;
    }

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  private boolean isPassword(String password, boolean userPassword) throws IOException, BadSecurityHandlerException, CryptographyException {
        final StandardSecurityHandler secHandler = getSecurityHandler();
      
        PDEncryptionDictionary dictionary = getPDFDocument().getEncryptionDictionary();


        int dicPermissions = dictionary.getPermissions();
        int dicRevision = dictionary.getRevision();
        int dicLength = dictionary.getLength()/8;


        COSString id = (COSString) getPDFDocument().getDocument().getDocumentID().getObject( 0 );
        byte[] u = dictionary.getUserKey();
        byte[] o = dictionary.getOwnerKey();


        if (userPassword)
        {
          return secHandler.isUserPassword(password.getBytes(), u, 
              o, dicPermissions, id.getBytes(), dicRevision, dicLength );

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        }
  }


  private StandardSecurityHandler getSecurityHandler() throws IOException,
      BadSecurityHandlerException {
    PDEncryptionDictionary dict = getPDFDocument().getEncryptionDictionary();
        StandardSecurityHandler secHandler = (StandardSecurityHandler) SecurityHandlersManager.getInstance().getSecurityHandler(dict.getFilter());
    return secHandler;
  }

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   */
  public int getEncryptionLength() {
    int length = 0;
    try {
      if (pdDocument.isEncrypted()) {
        final PDEncryptionDictionary dicen = pdDocument
            .getEncryptionDictionary();
        length = dicen.getLength();
      }
    } catch (IOException ioe) {
      length = 0;
    }
    return length;

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      fireSpecialNull(ctx, "version", Float.toString(cosDoc.getVersion()));
      
      ctx.fireStartParseEvent("security");
      ctx.fireParseEvent("encrypted", encrypted);
      if (encrypted) {
        PDEncryptionDictionary encDict = doc.getEncryptionDictionary();
  
        PDFPermissions perms = new PDFPermissions(
            encDict.getCOSDictionary().getInt("P"),
            encDict.getCOSDictionary().getInt("V"));
        
        fireSpecialNull(ctx, "scheme", encDict.getFilter());
        fireSpecialNull(ctx, "scheme-type", schemeVersionNames[encDict.getVersion()]);
        ctx.fireParseEvent("key-length", encDict.getLength());
        ctx.fireParseEvent("readonly", !perms.allowModify());
        ctx.fireParseEvent("allow-print", perms.allowPrint());
        ctx.fireParseEvent("allow-copy", perms.allowCopy());
        ctx.fireParseEvent("allow-notes", perms.allowTextNotes());
        ctx.fireParseEvent("user-password", encDict.getUserKey() != null);
        ctx.fireParseEvent("owner-password", encDict.getOwnerKey() != null);
      }
      ctx.fireEndParseEvent("security");    
      
      ctx.fireEndParseEvent("pdf-meta");
    }

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