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