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LibPDF: Add implementation of the Standard security handler

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Security handlers manage encryption and decription of PDF files. The
standard security handler uses RC4/MD5 to perform its crypto (AES as
well, but that is not yet implemented).
This commit is contained in:
Matthew Olsson 2022-03-20 14:24:23 -07:00 • committed by Andreas Kling
parent c98bda8ce6
commit 5b316462b2
9 changed files with 522 additions and 3 deletions
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24
Userland/Libraries/LibPDF/Document.cpp
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@ -41,9 +41,18 @@ PDFErrorOr<NonnullRefPtr<Document>> Document::create(ReadonlyBytes bytes)
TRY(parser->initialize());
document->m_trailer = parser->trailer();
document->m_catalog = TRY(parser->trailer()->get_dict(document, CommonNames::Root));
TRY(document->build_page_tree());
TRY(document->build_outline());
if (document->m_trailer->contains(CommonNames::Encrypt)) {
auto encryption_dict = TRY(document->m_trailer->get_dict(document, CommonNames::Encrypt));
document->m_security_handler = TRY(SecurityHandler::create(document, encryption_dict));
// Automatically attempt to unencrypt the document with the empty string. The
// result is not important; it is the caller's responsibility to ensure the
// document is unencrypted before calling initialize().
document->m_security_handler->try_provide_user_password("");
}
return document;
}
@ -54,6 +63,17 @@ Document::Document(NonnullRefPtr<Parser> const& parser)
m_parser->set_document(this);
}
PDFErrorOr<void> Document::initialize()
{
if (m_security_handler)
VERIFY(m_security_handler->has_user_password());
TRY(build_page_tree());
TRY(build_outline());
return {};
}
PDFErrorOr<Value> Document::get_or_load_value(u32 index)
{
auto value = get_value(index);