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63c2d1c539
git-svn-id: http://encfs.googlecode.com/svn/trunk@97 db9cf616-1c43-0410-9cb8-a902689de0d6
100 lines
2.8 KiB
C++
100 lines
2.8 KiB
C++
/*****************************************************************************
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* Author: Valient Gough <vgough@pobox.com>
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*
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*****************************************************************************
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* Copyright (c) 2004, Valient Gough
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*
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* This program is free software: you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation, either version 3 of the License, or (at your
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* option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
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* for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _CipherFileIO_incl_
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#define _CipherFileIO_incl_
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#include "cipher/CipherKey.h"
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#include "fs/BlockFileIO.h"
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#include "fs/FileUtils.h"
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#include <inttypes.h>
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namespace encfs {
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class CipherV1;
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/*
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Implement the FileIO interface encrypting data in blocks.
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Uses BlockFileIO to handle the block scatter / gather issues.
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*/
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class CipherFileIO : public BlockFileIO
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{
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public:
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CipherFileIO( const shared_ptr<FileIO> &base,
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const FSConfigPtr &cfg);
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virtual ~CipherFileIO();
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virtual Interface interface() const;
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virtual void setFileName( const char *fileName );
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virtual const char *getFileName() const;
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virtual bool setIV( uint64_t iv );
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virtual int open( int flags );
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virtual int getAttr( struct stat *stbuf ) const;
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virtual off_t getSize() const;
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// NOTE: if truncate is used to extend the file, the extended plaintext is
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// not 0. The extended ciphertext may be 0, resulting in non-zero
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// plaintext.
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virtual int truncate( off_t size );
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virtual bool isWritable() const;
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private:
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virtual ssize_t readOneBlock( const IORequest &req ) const;
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virtual bool writeOneBlock( const IORequest &req );
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void initHeader();
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bool writeHeader();
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bool blockRead( unsigned char *buf, int size,
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uint64_t iv64 ) const;
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bool streamRead( unsigned char *buf, int size,
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uint64_t iv64 ) const;
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bool blockWrite( unsigned char *buf, int size,
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uint64_t iv64 ) const;
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bool streamWrite( unsigned char *buf, int size,
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uint64_t iv64 ) const;
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off_t adjustedSize(off_t size) const;
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shared_ptr<FileIO> base;
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FSConfigPtr fsConfig;
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// if haveHeader is true, then we have a transparent file header which
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int headerLen;
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bool perFileIV;
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bool externalIVChaining;
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uint64_t externalIV;
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uint64_t fileIV;
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int lastFlags;
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shared_ptr<CipherV1> cipher;
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};
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} // namespace encfs
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#endif
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