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Save document with encryption

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Jakub Melka
2021-05-15 19:08:45 +02:00
parent aa059ea1f6
commit 9539faf548
5 changed files with 364 additions and 62 deletions
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42
Pdf4QtLib/sources/pdfsecurityhandler.h
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@ -127,6 +127,13 @@ public:
/// \returns Decrypted object
PDFObject decryptObject(const PDFObject& object, PDFObjectReference reference) const;
/// Encrypts the PDF object. This function works properly only (and only if)
/// \p authenticate function returns user/owner authorization code.
/// \param object Object to be encrypted
/// \param reference Reference of indirect object (some algorithms require to generate key also from reference)
/// \returns Encrypted object
PDFObject encryptObject(const PDFObject& object, PDFObjectReference reference) const;
/// Decrypts the PDF object data. This function works properly only (and only if)
/// \p authenticate function returns user/owner authorization code.
/// \param data Data to be decrypted
@ -141,6 +148,20 @@ public:
/// \param reference Reference object
virtual QByteArray decryptByFilter(const QByteArray& data, const QByteArray& filterName, PDFObjectReference reference) const = 0;
/// Encrypts the PDF object data. This function works properly only (and only if)
/// \p authenticate function returns user/owner authorization code.
/// \param data Data to be encrypted
/// \param reference Reference of indirect object (some algorithms require to generate key also from reference)
/// \param encryptionScope Scope of the encryption (if it is string/stream/...)
/// \returns Encrypted object data
virtual QByteArray encrypt(const QByteArray& data, PDFObjectReference reference, EncryptionScope encryptionScope) const = 0;
/// Encrypts data using specified filter. Throws exception, if filter is not found.
/// \param data Data to be encrypted
/// \param filterName Filter name to be used to encrypt the data
/// \param reference Reference object
virtual QByteArray encryptByFilter(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;
@ -148,6 +169,10 @@ public:
/// Returns true, if metadata are encrypted
virtual bool isMetadataEncrypted() const = 0;
/// Returns true, if encryption is allowed (and document
/// can be encrypted, if it was decrypted)
virtual bool isEncryptionAllowed() const = 0;
/// Returns result of authorization process
virtual AuthorizationResult getAuthorizationResult() const = 0;
@ -192,8 +217,11 @@ public:
virtual AuthorizationResult authenticate(const std::function<QString(bool*)>&, 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 QByteArray encrypt(const QByteArray& data, PDFObjectReference, EncryptionScope) const override { return data; }
virtual QByteArray encryptByFilter(const QByteArray& data, const QByteArray&, PDFObjectReference) const override { return data; }
virtual bool isMetadataEncrypted() const override { return true; }
virtual bool isAllowed(Permission) const override { return true; }
virtual bool isEncryptionAllowed() const override { return true; }
virtual AuthorizationResult getAuthorizationResult() const override { return AuthorizationResult::NoAuthorizationRequired; }
};
@ -206,8 +234,11 @@ public:
virtual AuthorizationResult authenticate(const std::function<QString(bool*)>& getPasswordCallback, bool authorizeOwnerOnly) 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 QByteArray encrypt(const QByteArray& data, PDFObjectReference reference, EncryptionScope encryptionScope) const override;
virtual QByteArray encryptByFilter(const QByteArray& data, const QByteArray& filterName, PDFObjectReference reference) const override;
virtual bool isMetadataEncrypted() const override { return m_encryptMetadata; }
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; }
struct AuthorizationData
@ -267,6 +298,17 @@ private:
/// \returns Decrypted data
QByteArray decryptUsingFilter(const QByteArray& data, CryptFilter filter, PDFObjectReference reference) const;
/// Encrypts data using specified filter. This function can be called only, if authorization was successfull.
/// \param data Data to be encrypted
/// \param filter Filter to be used for encryption
/// \param reference Object reference for key generation
/// \returns Encrypted data
QByteArray encryptUsingFilter(const QByteArray& data, CryptFilter filter, PDFObjectReference reference) const;
std::vector<uint8_t> createV2_ObjectEncryptionKey(PDFObjectReference reference, CryptFilter filter) const;
std::vector<uint8_t> createAESV2_ObjectEncryptionKey(PDFObjectReference reference) const;
CryptFilter getCryptFilter(EncryptionScope encryptionScope) const;
/// Returns true, if character with unicode code is non-ascii space character
/// according the RFC 3454, section C.1.2
/// \param unicode Unicode code to be tested