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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 : #ifndef OOX_XLS_BIFFCODEC_HXX
21 : #define OOX_XLS_BIFFCODEC_HXX
22 :
23 : #include <vector>
24 : #include <comphelper/docpasswordhelper.hxx>
25 : #include "oox/core/binarycodec.hxx"
26 : #include "workbookhelper.hxx"
27 :
28 : namespace oox {
29 : namespace xls {
30 :
31 : // ============================================================================
32 :
33 : const sal_Int64 BIFF_RCF_BLOCKSIZE = 1024;
34 :
35 : // ============================================================================
36 :
37 : /** Base class for BIFF stream decoders. */
38 : class BiffDecoderBase : public ::comphelper::IDocPasswordVerifier
39 : {
40 : public:
41 : explicit BiffDecoderBase();
42 : virtual ~BiffDecoderBase();
43 :
44 : /** Derived classes return a clone of the decoder for usage in new streams. */
45 0 : inline BiffDecoderBase* clone() { return implClone(); }
46 :
47 : /** Implementation of the ::comphelper::IDocPasswordVerifier interface. */
48 : virtual ::comphelper::DocPasswordVerifierResult verifyPassword( const ::rtl::OUString& rPassword, ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& o_rEncryptionData );
49 : virtual ::comphelper::DocPasswordVerifierResult verifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& o_rEncryptionData );
50 :
51 : /** Returns true, if the decoder has been initialized correctly. */
52 0 : inline bool isValid() const { return mbValid; }
53 :
54 : /** Decodes nBytes bytes and writes encrypted data into the buffer pnDestData. */
55 : void decode(
56 : sal_uInt8* pnDestData,
57 : const sal_uInt8* pnSrcData,
58 : sal_Int64 nStreamPos,
59 : sal_uInt16 nBytes );
60 :
61 : private:
62 : /** Derived classes return a clone of the decoder for usage in new streams. */
63 : virtual BiffDecoderBase* implClone() = 0;
64 :
65 : /** Derived classes implement password verification and initialization of
66 : the decoder. */
67 : virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword ) = 0;
68 : virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData ) = 0;
69 :
70 : /** Implementation of decryption of a memory block. */
71 : virtual void implDecode(
72 : sal_uInt8* pnDestData,
73 : const sal_uInt8* pnSrcData,
74 : sal_Int64 nStreamPos,
75 : sal_uInt16 nBytes ) = 0;
76 :
77 : private:
78 : bool mbValid; /// True = decoder is correctly initialized.
79 : };
80 :
81 : typedef ::boost::shared_ptr< BiffDecoderBase > BiffDecoderRef;
82 :
83 : // ============================================================================
84 :
85 : /** Decodes BIFF stream contents that are encoded using the old XOR algorithm. */
86 0 : class BiffDecoder_XOR : public BiffDecoderBase
87 : {
88 : private:
89 : /** Copy constructor for cloning. */
90 : BiffDecoder_XOR( const BiffDecoder_XOR& rDecoder );
91 :
92 : /** Returns a clone of the decoder for usage in new streams. */
93 : virtual BiffDecoder_XOR* implClone();
94 :
95 : /** Implements password verification and initialization of the decoder. */
96 : virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword );
97 : virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
98 :
99 :
100 : /** Implementation of decryption of a memory block. */
101 : virtual void implDecode(
102 : sal_uInt8* pnDestData,
103 : const sal_uInt8* pnSrcData,
104 : sal_Int64 nStreamPos,
105 : sal_uInt16 nBytes );
106 :
107 : private:
108 : ::oox::core::BinaryCodec_XOR maCodec; /// Cipher algorithm implementation.
109 : ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > maEncryptionData;
110 : sal_uInt16 mnKey;
111 : sal_uInt16 mnHash;
112 : };
113 :
114 : // ============================================================================
115 :
116 : /** Decodes BIFF stream contents that are encoded using the RC4 algorithm. */
117 0 : class BiffDecoder_RCF : public BiffDecoderBase
118 : {
119 : private:
120 : /** Copy constructor for cloning. */
121 : BiffDecoder_RCF( const BiffDecoder_RCF& rDecoder );
122 :
123 : /** Returns a clone of the decoder for usage in new streams. */
124 : virtual BiffDecoder_RCF* implClone();
125 :
126 : /** Implements password verification and initialization of the decoder. */
127 : virtual ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > implVerifyPassword( const ::rtl::OUString& rPassword );
128 : virtual bool implVerifyEncryptionData( const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue >& rEncryptionData );
129 :
130 : /** Implementation of decryption of a memory block. */
131 : virtual void implDecode(
132 : sal_uInt8* pnDestData,
133 : const sal_uInt8* pnSrcData,
134 : sal_Int64 nStreamPos,
135 : sal_uInt16 nBytes );
136 :
137 : private:
138 : ::oox::core::BinaryCodec_RCF maCodec; /// Cipher algorithm implementation.
139 : ::com::sun::star::uno::Sequence< ::com::sun::star::beans::NamedValue > maEncryptionData;
140 : ::std::vector< sal_uInt8 > maSalt;
141 : ::std::vector< sal_uInt8 > maVerifier;
142 : ::std::vector< sal_uInt8 > maVerifierHash;
143 : };
144 :
145 : // ============================================================================
146 :
147 : /** Helper for BIFF stream codecs. Holds the used codec object. */
148 0 : class BiffCodecHelper : public WorkbookHelper
149 : {
150 : public:
151 : explicit BiffCodecHelper( const WorkbookHelper& rHelper );
152 :
153 : /** Clones the contained decoder object if existing and sets it at the passed stream. */
154 : void cloneDecoder( BiffInputStream& rStrm );
155 :
156 : private:
157 : BiffDecoderRef mxDecoder; /// The decoder for import filter.
158 : };
159 :
160 : // ============================================================================
161 :
162 : } // namespace xls
163 : } // namespace oox
164 :
165 : #endif
166 :
167 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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