xmlsecurity/source/framework/encryptionengine.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  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19
  20
  21 #include "encryptionengine.hxx"
  22 #include <com/sun/star/xml/crypto/XXMLEncryptionTemplate.hpp>
  23 #include <com/sun/star/xml/wrapper/XXMLElementWrapper.hpp>
  24 #include <com/sun/star/lang/XMultiServiceFactory.hpp>
  25
  26 namespace cssu = com::sun::star::uno;
  27 namespace cssxc = com::sun::star::xml::crypto;
  28 namespace cssxw = com::sun::star::xml::wrapper;
  29
  30 #define ENCRYPTION_TEMPLATE "com.sun.star.xml.crypto.XMLEncryptionTemplate"
  31
  32 EncryptionEngine::EncryptionEngine( )
  33         :m_nIdOfBlocker(-1)
  34 {
  35 }
  36
  37 bool EncryptionEngine::checkReady() const
  38 /****** EncryptionEngine/checkReady ******************************************
  39  *
  40  *   NAME
  41  *  checkReady -- checks the conditions for the main operation.
  42  *
  43  *   SYNOPSIS
  44  *  bReady = checkReady( );
  45  *
  46  *   FUNCTION
  47  *  checks whether all following conditions are satisfied:
  48  *  1. the main operation has't begun yet;
  49  *  2. the key material is known;
  50  *  3. the id of the template blocker is known;
  51  *  4. both the key element and the encryption template
  52  *     are bufferred.
  53  *
  54  *   INPUTS
  55  *  empty
  56  *
  57  *   RESULT
  58  *  bReady - true if all conditions are satisfied, false otherwise
  59  *
  60  *   AUTHOR
  61  *  Michael Mi
  62  *  Email: michael.mi@sun.com
  63  ******************************************************************************/
  64 {
  65     bool rc = true;
  66
  67     sal_Int32 nKeyInc = 0;
  68     if (m_nIdOfKeyEC != 0)
  69     {
  70         nKeyInc = 1;
  71     }
  72
  73     if (m_bMissionDone ||
  74         m_nIdOfKeyEC == -1 ||
  75         m_nIdOfBlocker == -1 ||
  76         1+nKeyInc > m_nNumOfResolvedReferences )
  77     {
  78         rc = false;
  79     }
  80
  81     return rc;
  82 }
  83
  84 void EncryptionEngine::tryToPerform( )
  85         throw (cssu::Exception, cssu::RuntimeException)
  86 /****** EncryptionEngine/tryToPerform ****************************************
  87  *
  88  *   NAME
  89  *  tryToPerform -- tries to perform the encryption/decryption operation.
  90  *
  91  *   SYNOPSIS
  92  *  tryToPerform( );
  93  *
  94  *   FUNCTION
  95  *  if the situation is ready, perform following operations.
  96  *  1. prepares a encryption template;
  97  *  2. calls the encryption bridge component;
  98  *  3. clears up all used resources;
  99  *  4. notifies the result listener;
 100  *  5. sets the "accomplishment" flag.
 101  *
 102  *   INPUTS
 103  *  empty
 104  *
 105  *   RESULT
 106  *  empty
 107  *
 108  *   AUTHOR
 109  *  Michael Mi
 110  *  Email: michael.mi@sun.com
 111  ******************************************************************************/
 112 {
 113     if (checkReady())
 114     {
 115         const rtl::OUString sEncryptionTemplate (
 116             RTL_CONSTASCII_USTRINGPARAM( ENCRYPTION_TEMPLATE ) );
 117         cssu::Reference < cssxc::XXMLEncryptionTemplate > xEncryptionTemplate(
 118             mxMSF->createInstance( sEncryptionTemplate ), cssu::UNO_QUERY );
 119
 120         OSL_ASSERT( xEncryptionTemplate.is() );
 121
 122         cssu::Reference< cssxw::XXMLElementWrapper > xXMLElement
 123             = m_xSAXEventKeeper->getElement( m_nIdOfTemplateEC );
 124
 125         xEncryptionTemplate->setTemplate(xXMLElement);
 126
 127         startEngine( xEncryptionTemplate );
 128
 129         /*
 130          * done
 131          */
 132         clearUp( );
 133
 134         notifyResultListener();
 135
 136         m_bMissionDone = true;
 137     }
 138 }
 139
 140 void EncryptionEngine::clearUp( ) const
 141 /****** EncryptionEngine/clearup *********************************************
 142  *
 143  *   NAME
 144  *  clearUp -- clear up all resources used by this operation.
 145  *
 146  *   SYNOPSIS
 147  *  clearUp( );
 148  *
 149  *   FUNCTION
 150  *  cleaning resources up includes:
 151  *  1. releases the ElementCollector for the encryption template element;
 152  *  2. releases the Blocker for the encryption template element;
 153  *  3. releases the ElementCollector for the key element, if there is one.
 154  *
 155  *   INPUTS
 156  *  empty
 157  *
 158  *   RESULT
 159  *  empty
 160  *
 161  *   AUTHOR
 162  *  Michael Mi
 163  *  Email: michael.mi@sun.com
 164  ******************************************************************************/
 165 {
 166     cssu::Reference < cssxc::sax::XReferenceResolvedBroadcaster >
 167         xReferenceResolvedBroadcaster( m_xSAXEventKeeper, cssu::UNO_QUERY );
 168
 169     xReferenceResolvedBroadcaster->removeReferenceResolvedListener(
 170         m_nIdOfTemplateEC,
 171         (const cssu::Reference < cssxc::sax::XReferenceResolvedListener >)((SecurityEngine *)this));
 172
 173     m_xSAXEventKeeper->removeElementCollector(m_nIdOfTemplateEC);
 174
 175     if (m_nIdOfBlocker != -1)
 176     {
 177         m_xSAXEventKeeper->removeBlocker(m_nIdOfBlocker);
 178     }
 179
 180     if (m_nIdOfKeyEC != 0 && m_nIdOfKeyEC != -1)
 181     {
 182         m_xSAXEventKeeper->removeElementCollector(m_nIdOfKeyEC);
 183     }
 184 }
 185
 186 /* XBlockerMonitor */
 187 void SAL_CALL EncryptionEngine::setBlockerId( sal_Int32 id )
 188     throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException)
 189 {
 190     m_nIdOfBlocker = id;
 191     tryToPerform();
 192 }
 193
 194 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */