mirror of
https://github.com/JakubMelka/PDF4QT.git
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127 lines
3.9 KiB
C++
127 lines
3.9 KiB
C++
// Copyright (C) 2019 Jakub Melka
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//
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// This file is part of PdfForQt.
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//
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// PdfForQt is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// PdfForQt is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDFForQt. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDFSECURITYHANDLER_H
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#define PDFSECURITYHANDLER_H
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#include "pdfglobal.h"
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#include "pdfobject.h"
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#include <QByteArray>
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#include <QSharedPointer>
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#include <map>
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namespace pdf
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{
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enum class EncryptionMode
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{
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None, ///< Document is not encrypted
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Standard, ///< Document is encrypted and using standard security handler
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Custom ///< Document is encrypted and using custom security handler. Custom handlers must return this value.
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};
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enum class CryptFilterType
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{
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None, ///< The application shall decrypt the data using the security handler
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V2, ///< Use file encryption key for RC4 algorithm
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AESV2, ///< Use file encryption key for AES algorithm
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AESV3, ///< Use file encryption key for AES 256 bit algorithm
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Identity, ///< Don't decrypt anything, use identity function
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};
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enum class AuthEvent
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{
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DocOpen, ///< Authorize on document open
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EFOpen ///< Authorize when accessing embedded file stream
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};
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enum class CryptFilterApplication
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{
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String, ///< Apply filter to decrypt/encrypt strings
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Stream, ///< Apply filter to decrypt/encrypt streams
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EmbeddedFile ///< Apply filter to decrypt/encrypt embedded file streams
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};
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struct CryptFilter
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{
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CryptFilterType type = CryptFilterType::None;
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AuthEvent authEvent = AuthEvent::DocOpen;
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};
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class PDFSecurityHandler;
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using PDFSecurityHandlerPointer = QSharedPointer<PDFSecurityHandler>;
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class PDFSecurityHandler
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{
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public:
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explicit PDFSecurityHandler() = default;
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virtual ~PDFSecurityHandler() = default;
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virtual EncryptionMode getMode() const = 0;
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/// Creates a security handler from the object. If object is null, then
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/// "None" security handler is created. If error occurs, then exception is thrown.
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/// \param encryptionDictionaryObject Encryption dictionary object
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static PDFSecurityHandlerPointer createSecurityHandler(const PDFObject& encryptionDictionaryObject);
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private:
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/// Version of the encryption, shall be a number from 1 to 5, according the
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/// PDF specification. Other values are invalid.
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int m_V = 0;
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/// Length of the key to encrypt/decrypt the document in bits. Only valid
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/// for V = 2 or V = 3, otherwise it is invalid.
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int m_keyLength = 40;
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/// Map containing crypt filters.
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std::map<QByteArray, CryptFilter> m_cryptFilters;
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/// Crypt filter for decrypting strings
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CryptFilter m_filterStrings;
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/// Crypt filter for decrypting streams
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CryptFilter m_filterStreams;
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/// Crypt filter for decrypting embedded files
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CryptFilter m_filterEmbeddedFiles;
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};
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/// Specifies the security of unencrypted document
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class PDFNoneSecurityHandler : public PDFSecurityHandler
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{
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public:
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virtual EncryptionMode getMode() const { return EncryptionMode::None; }
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};
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/// Specifies the security using standard security handler (see PDF specification
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/// for details).
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class PDFStandardSecurityHandler : public PDFSecurityHandler
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{
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public:
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virtual EncryptionMode getMode() const { return EncryptionMode::Standard; }
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private:
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};
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} // namespace pdf
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#endif // PDFSECURITYHANDLER_H
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