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Encryption - RC4

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Jakub Melka
2021-05-29 18:13:30 +02:00
parent 936fe2fbe7
commit e3fecc0568
6 changed files with 399 additions and 7 deletions
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15
Pdf4QtLib/sources/pdfsecurityhandler.h
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@ -29,6 +29,7 @@
namespace pdf
{
class PDFObjectFactory;
enum class EncryptionMode
{
@ -61,6 +62,9 @@ enum class CryptFilterApplication
struct CryptFilter
{
bool operator ==(const CryptFilter&) const = default;
bool operator !=(const CryptFilter&) const = default;
CryptFilterType type = CryptFilterType::None;
AuthEvent authEvent = AuthEvent::DocOpen;
int keyLength = 0; ///< Key length in bytes
@ -179,6 +183,9 @@ public:
/// Returns result of authorization process
virtual AuthorizationResult getAuthorizationResult() const = 0;
/// Creates encryption dictionary object
virtual PDFObject createEncryptionDictionaryObject() const = 0;
/// Returns version of the encryption
int getVersion() const { return m_V; }
@ -189,6 +196,11 @@ public:
static PDFSecurityHandlerPointer createSecurityHandler(const PDFObject& encryptionDictionaryObject, const QByteArray& id);
protected:
/// Fills encryption dictionary with basic data
/// \param factory Factory
void fillEncryptionDictionary(PDFObjectFactory& factory);
/// Version of the encryption, shall be a number from 1 to 5, according the
/// PDF specification. Other values are invalid.
int m_V = 0;
@ -227,6 +239,7 @@ public:
virtual bool isAllowed(Permission) const override { return true; }
virtual bool isEncryptionAllowed() const override { return true; }
virtual AuthorizationResult getAuthorizationResult() const override { return AuthorizationResult::NoAuthorizationRequired; }
virtual PDFObject createEncryptionDictionaryObject() const override { return PDFObject(); }
};
/// Specifies the security using standard security handler (see PDF specification
@ -245,6 +258,7 @@ public:
virtual bool isAllowed(Permission permission) const override { return m_authorizationData.authorizationResult == AuthorizationResult::OwnerAuthorized || (m_permissions & static_cast<uint32_t>(permission)); }
virtual bool isEncryptionAllowed() const override { return m_authorizationData.isAuthorized(); }
virtual AuthorizationResult getAuthorizationResult() const override { return m_authorizationData.authorizationResult; }
virtual PDFObject createEncryptionDictionaryObject() const override;
struct AuthorizationData
{
@ -258,6 +272,7 @@ public:
static QByteArray adjustPassword(const QString& password, int revision);
private:
friend class PDFSecurityHandlerFactory;
friend PDFSecurityHandlerPointer PDFSecurityHandler::createSecurityHandler(const PDFObject& encryptionDictionaryObject, const QByteArray& id);
struct UserOwnerData_r6