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98 lines
2.7 KiB
C++
98 lines
2.7 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 <inttypes.h>
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#include <memory>
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#include <stdint.h>
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#include <sys/types.h>
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#include "BlockFileIO.h"
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#include "CipherKey.h"
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#include "FSConfig.h"
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#include "FileUtils.h"
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#include "Interface.h"
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namespace encfs {
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class Cipher;
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class FileIO;
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struct IORequest;
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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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public:
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CipherFileIO(std::shared_ptr<FileIO> base, 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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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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virtual void generateReverseHeader(unsigned char *data);
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void initHeader();
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bool writeHeader();
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bool blockRead(unsigned char *buf, int size, uint64_t iv64) const;
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bool streamRead(unsigned char *buf, int size, uint64_t iv64) const;
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bool blockWrite(unsigned char *buf, int size, uint64_t iv64) const;
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bool streamWrite(unsigned char *buf, int size, uint64_t iv64) const;
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ssize_t read(const IORequest &req) const;
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std::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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// contains a 64 bit initialization vector.
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bool haveHeader;
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uint64_t externalIV;
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uint64_t fileIV;
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int lastFlags;
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std::shared_ptr<Cipher> cipher;
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CipherKey key;
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};
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} // namespace encfs
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#endif
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