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Crypt filters & revision 5 encryption

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Jakub Melka
2019-08-13 15:48:01 +02:00
parent 2623ef6825
commit 6c261241ad
8 changed files with 209 additions and 57 deletions
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29
PdfForQtLib/sources/pdfsecurityhandler.h
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@ -75,6 +75,21 @@ public:
explicit PDFSecurityHandler() = default;
virtual ~PDFSecurityHandler() = default;
static constexpr const char* IDENTITY_FILTER_NAME = "Identity";
static constexpr const char* OBJECT_REFERENCE_DICTIONARY_NAME = "PdfForQt_ObjectReference";
enum class Permission : uint32_t
{
PrintLowResolution = (1 << 2),
Modify = (1 << 3),
CopyContent = (1 << 4),
ModifyInteractiveItems = (1 << 5),
ModifyFormFields = (1 << 8),
Accessibility = (1 << 9),
Assemble = (1 << 10),
PrintHighResolution = (1 << 11)
};
enum class AuthorizationResult
{
UserAuthorized,
@ -118,6 +133,16 @@ public:
/// \returns Decrypted object data
virtual QByteArray decrypt(const QByteArray& data, PDFObjectReference reference, EncryptionScope encryptionScope) const = 0;
/// Decrypts data using specified filter. Throws exception, if filter is not found.
/// \param data Data to be decrypted
/// \param filterName Filter name to be used to decrypt the data
/// \param reference Reference object
virtual QByteArray decryptByFilter(const QByteArray& data, const QByteArray& filterName, PDFObjectReference reference) const = 0;
/// Returns true, if given permission is allowed in the current authorization context.
/// If owner is authorized, then this function allways returns true.
virtual bool isAllowed(Permission permission) const = 0;
/// Returns true, if metadata are encrypted
virtual bool isMetadataEncrypted() const = 0;
@ -158,7 +183,9 @@ public:
virtual EncryptionMode getMode() const { return EncryptionMode::None; }
virtual AuthorizationResult authenticate(const std::function<QString(bool*)>&) override { return AuthorizationResult::OwnerAuthorized; }
virtual QByteArray decrypt(const QByteArray& data, PDFObjectReference, EncryptionScope) const override { return data; }
virtual QByteArray decryptByFilter(const QByteArray& data, const QByteArray&, PDFObjectReference) const override { return data; }
virtual bool isMetadataEncrypted() const override { return true; }
virtual bool isAllowed(Permission) const { return true; }
};
/// Specifies the security using standard security handler (see PDF specification
@ -169,7 +196,9 @@ public:
virtual EncryptionMode getMode() const { return EncryptionMode::Standard; }
virtual AuthorizationResult authenticate(const std::function<QString(bool*)>& getPasswordCallback) override;
virtual QByteArray decrypt(const QByteArray& data, PDFObjectReference reference, EncryptionScope encryptionScope) const override;
virtual QByteArray decryptByFilter(const QByteArray& data, const QByteArray& filterName, PDFObjectReference reference) const override;
virtual bool isMetadataEncrypted() const override { return m_encryptMetadata; }
virtual bool isAllowed(Permission permission) const { return m_authorizationData.authorizationResult == AuthorizationResult::OwnerAuthorized || (m_permissions & static_cast<uint32_t>(permission)); }
struct AuthorizationData
{