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xmlsecurity PDF sign: improve suggested signature ID

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So that when we have a single signature with ID="Signature2", then we
use "Signature3" for the next ID, not "Signature2". (Acrobat uses that ID
for the first signature.)

Change-Id: I7032fbf014184da2a5be24730a92abc32a9a1258
Reviewed-on: https://gerrit.libreoffice.org/30725
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
This commit is contained in:
Miklos Vajna 2016-11-09 16:32:48 +01:00
parent 2a7e39eac2
commit f68b1541ea
2 changed files with 23 additions and 2 deletions
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2
xmlsecurity/inc/pdfio/pdfdocument.hxx
View File

@ -113,6 +113,8 @@ class XMLSECURITY_DLLPUBLIC PDFDocument
static int AsHex(char ch);
/// Decode a hex dump.
static std::vector<unsigned char> DecodeHexString(PDFHexStringElement* pElement);
/// Suggest a minimal, yet free signature ID to use for the next signature.
sal_uInt32 GetNextSignature();
public:
PDFDocument();

23
xmlsecurity/source/pdfio/pdfdocument.cxx
View File

@ -335,11 +335,30 @@ bool PDFDocument::RemoveSignature(size_t nPosition)
return m_aEditBuffer.good();
}
sal_uInt32 PDFDocument::GetNextSignature()
{
sal_uInt32 nRet = 0;
for (const auto& pSignature : GetSignatureWidgets())
{
auto pT = dynamic_cast<PDFLiteralStringElement*>(pSignature->Lookup("T"));
if (!pT)
continue;
const OString& rValue = pT->GetValue();
const OString aPrefix = "Signature";
if (!rValue.startsWith(aPrefix))
continue;
nRet = std::max(nRet, rValue.copy(aPrefix.getLength()).toUInt32());
}
return nRet + 1;
}
bool PDFDocument::Sign(const uno::Reference<security::XCertificate>& xCertificate, const OUString& rDescription)
{
// Decide what identifier to use for the new signature.
std::vector<PDFObjectElement*> aSignatures = GetSignatureWidgets();
sal_uInt32 nNextSignature = aSignatures.size() + 1;
sal_uInt32 nNextSignature = GetNextSignature();
m_aEditBuffer.Seek(STREAM_SEEK_TO_END);
m_aEditBuffer.WriteCharPtr("\n");