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Implementation of rev. 6 hash

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Jakub Melka
2019-08-11 15:46:26 +02:00
parent 0434a70de5
commit c4ea7a3ea8
3 changed files with 247 additions and 6 deletions
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23
PdfForQtLib/sources/pdfsecurityhandler.h
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@ -131,12 +131,22 @@ public:
struct AuthorizationData
{
bool isAuthorized() const { return authorizationResult == AuthorizationResult::UserAuthorized || authorizationResult == AuthorizationResult::OwnerAuthorized; }
AuthorizationResult authorizationResult = AuthorizationResult::Failed;
QByteArray fileEncryptionKey;
};
private:
friend static PDFSecurityHandlerPointer PDFSecurityHandler::createSecurityHandler(const PDFObject& encryptionDictionaryObject, const QByteArray& id);
struct UserOwnerData_r6
{
QByteArray hash;
QByteArray validationSalt;
QByteArray keySalt;
};
/// Creates file encryption key from passed password, based on the revision
/// \param password Password to be used to create file encryption key
/// \note Password must be in PDFDocEncoding for revision 4 or earlier,
@ -156,6 +166,16 @@ private:
/// then padding password is returned.
std::array<uint8_t, 32> createPaddedPassword32(const QByteArray& password) const;
/// Creates hash using algorithm 2.B for revision 6. Input is input of the hash,
/// and if \p useUserKey is used, user key is considered in the hash.
/// \param input Input of the hash
/// \param inputPassword Input password
/// \param useUserKey Use user key in the hash computation
QByteArray createHash_r6(const QByteArray& input, const QByteArray& inputPassword, bool useUserKey) const;
/// Parses parts of the user/owner data (U/O values of the encryption dictionary)
UserOwnerData_r6 parseParts(const QByteArray& data) const;
/// Revision number of standard security number
int m_R = 0;
@ -188,6 +208,9 @@ private:
/// First part of the id of the document
QByteArray m_ID;
/// Authorization data
AuthorizationData m_authorizationData;
};
} // namespace pdf