at.gv.egiz.pdfas.impl.vfilter.helper
Class VerificationFilterBinaryHelper

java.lang.Object
  at.gv.egiz.pdfas.impl.vfilter.helper.VerificationFilterBinaryHelper

public final class VerificationFilterBinaryHelper

extends Object

Contains helpful methods used by the VerificationFilter to analyze the PDF for binary signatures.

Author:

wprinz

Field Summary

static byte[]	EGIZ_DICT_NAME The name of the egiz dict key.
static byte[]	EGIZ_KZ_NAME The name of the ID (SIG_KZ) property in the egiz dict.

Constructor Summary

VerificationFilterBinaryHelper()

Method Summary

static boolean	containsEGIZDict(byte[] pdf, FooterParseResult block) Tells, if the given incremental update block contains a binary signature.
static PdfASID	extractKZFromEGIZBlock(byte[] pdf, FooterParseResult block) Extracts the PDF AS ID of the egiz block.
static String	restoreKZ(byte[] pdf, ArrayParseResult kz_apr) Restores the Kennzeichnung String from an Array.

Methods inherited from class java.lang.Object

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

Field Detail

EGIZ_DICT_NAME

public static final byte[] EGIZ_DICT_NAME

The name of the egiz dict key.

EGIZ_KZ_NAME

public static final byte[] EGIZ_KZ_NAME

The name of the ID (SIG_KZ) property in the egiz dict.

Constructor Detail

VerificationFilterBinaryHelper

public VerificationFilterBinaryHelper()

Method Detail

containsEGIZDict

public static boolean containsEGIZDict(byte[] pdf,
                                       FooterParseResult block)

Tells, if the given incremental update block contains a binary signature.

According to definition, if a block is a binary block, it must/cannot contain other signatures than this one.

Parameters:

block - The incremental update block.

Returns:

Returns true, if this block is a binary signature block, false otherwise.

extractKZFromEGIZBlock

public static PdfASID extractKZFromEGIZBlock(byte[] pdf,
                                             FooterParseResult block)
                                      throws PDFDocumentException,
                                             InvalidIDException

Extracts the PDF AS ID of the egiz block.

Parameters:

pdf - The pdf.

block - The IU block.

Returns:

Returns the extracted PDF AS ID.

Throws:

PDFDocumentException - Forwarded exception.

InvalidIDException - Forwarded exception.

restoreKZ

public static String restoreKZ(byte[] pdf,
                               ArrayParseResult kz_apr)
                        throws PDFDocumentException

Restores the Kennzeichnung String from an Array.

Parameters:

pdf - The PDF.

kz_apr - The Array, as parsed from the EGIZ Dict.

Returns:

Returns the restored KZ.

Throws:

PDFDocumentException - Forwarded exception.