oox/source/crypto/DocumentDecryption.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  */
  10
  11 #include <oox/crypto/DocumentDecryption.hxx>
  12
  13 #include <comphelper/sequenceashashmap.hxx>
  14 #include <cppuhelper/implbase.hxx>
  15
  16 #include <com/sun/star/beans/NamedValue.hpp>
  17 #include <com/sun/star/io/XStream.hpp>
  18 #include <com/sun/star/uno/XComponentContext.hpp>
  19 #include <oox/crypto/AgileEngine.hxx>
  20 #include <oox/crypto/Standard2007Engine.hxx>
  21 #include <oox/helper/binaryinputstream.hxx>
  22 #include <oox/helper/binaryoutputstream.hxx>
  23 #include <oox/ole/olestorage.hxx>
  24
  25 namespace oox {
  26 namespace core {
  27
  28 using namespace css;
  29
  30 DocumentDecryption::DocumentDecryption(oox::ole::OleStorage& rOleStorage) :
  31     mrOleStorage(rOleStorage),
  32     mCryptoType(UNKNOWN)
  33 {}
  34
  35 bool DocumentDecryption::generateEncryptionKey(const OUString& rPassword)
  36 {
  37     if (mEngine)
  38         return mEngine->generateEncryptionKey(rPassword);
  39     return false;
  40 }
  41
  42 bool DocumentDecryption::readEncryptionInfo()
  43 {
  44     if (!mrOleStorage.isStorage())
  45         return false;
  46
  47     uno::Reference<io::XInputStream> xEncryptionInfo = mrOleStorage.openInputStream("EncryptionInfo");
  48
  49     BinaryXInputStream aBinaryInputStream(xEncryptionInfo, true);
  50     sal_uInt32 aVersion = aBinaryInputStream.readuInt32();
  51
  52     switch (aVersion)
  53     {
  54         case msfilter::VERSION_INFO_2007_FORMAT:
  55         case msfilter::VERSION_INFO_2007_FORMAT_SP2:
  56             mCryptoType = STANDARD_2007; // Set encryption info format
  57             mEngine.reset(new Standard2007Engine);
  58             break;
  59         case msfilter::VERSION_INFO_AGILE:
  60             mCryptoType = AGILE; // Set encryption info format
  61             mEngine.reset(new AgileEngine);
  62             break;
  63         default:
  64             break;
  65     }
  66     if (mEngine)
  67         return mEngine->readEncryptionInfo(xEncryptionInfo);
  68     return false;
  69 }
  70
  71 uno::Sequence<beans::NamedValue> DocumentDecryption::createEncryptionData(const OUString& rPassword)
  72 {
  73     comphelper::SequenceAsHashMap aEncryptionData;
  74
  75     if (mCryptoType == AGILE)
  76     {
  77         aEncryptionData["CryptoType"] <<= OUString("Agile");
  78     }
  79     else if (mCryptoType == STANDARD_2007)
  80     {
  81         aEncryptionData["CryptoType"] <<= OUString("Standard");
  82     }
  83
  84     aEncryptionData["OOXPassword"] <<= rPassword;
  85     return aEncryptionData.getAsConstNamedValueList();
  86 }
  87
  88 bool DocumentDecryption::decrypt(const uno::Reference<io::XStream>& xDocumentStream)
  89 {
  90     bool bResult = false;
  91
  92     if (!mrOleStorage.isStorage())
  93         return false;
  94
  95     // open the required input streams in the encrypted package
  96     uno::Reference<io::XInputStream> xEncryptedPackage = mrOleStorage.openInputStream("EncryptedPackage");
  97
  98     // create temporary file for unencrypted package
  99     uno::Reference<io::XOutputStream> xDecryptedPackage = xDocumentStream->getOutputStream();
 100     BinaryXOutputStream aDecryptedPackage(xDecryptedPackage, true);
 101     BinaryXInputStream aEncryptedPackage(xEncryptedPackage, true);
 102
 103     bResult = mEngine->decrypt(aEncryptedPackage, aDecryptedPackage);
 104
 105     xDecryptedPackage->flush();
 106     aDecryptedPackage.seekToStart();
 107
 108     if (bResult)
 109         return mEngine->checkDataIntegrity();
 110
 111     return bResult;
 112 }
 113
 114 } // namespace core
 115 } // namespace oox
 116
 117 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */