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/*
Copyright (C) 2024 Selwin van Dijk
This file is part of signalbackup-tools.
signalbackup-tools is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
signalbackup-tools is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with signalbackup-tools. If not, see <https://www.gnu.org/licenses/>.
*/
#ifndef DESKTOPATTACHMENTREADER_H_
#define DESKTOPATTACHMENTREADER_H_
#include "../baseattachmentreader/baseattachmentreader.h"
#include "../framewithattachment/framewithattachment.h"
#include "../base64/base64.h"
#include "../rawfileattachmentreader/rawfileattachmentreader.h"
#include <openssl/evp.h>
#include <openssl/sha.h>
#include <openssl/hmac.h>
/*
version < 2 (or unset):
attachment data is just in the file
version 2:
File is encrypted:
[=16 bytes iv=][=AES-256-CBC encrypted file, padded with zeros to some binned size, padded with AES-CBC padding to next nearest multiple of 16=][=32 bytes HMAC=]
the passed in key ('localKey') is base64 encoded concatenation of 32 bytes AES key + 32 bytes MAC key
*/
class DesktopAttachmentReader : public AttachmentReader<DesktopAttachmentReader>
{
int d_version;
std::string d_path;
std::string d_key;
uint64_t d_size;
public:
inline explicit DesktopAttachmentReader(std::string const &path);
inline DesktopAttachmentReader(int version, std::string const &path, std::string const &key, uint64_t size);
inline DesktopAttachmentReader(DesktopAttachmentReader const &other) = default;
inline DesktopAttachmentReader(DesktopAttachmentReader &&other) = default;
inline DesktopAttachmentReader &operator=(DesktopAttachmentReader const &other) = default;
inline DesktopAttachmentReader &operator=(DesktopAttachmentReader &&other) = default;
inline virtual ~DesktopAttachmentReader() override = default;
inline virtual int getAttachment(FrameWithAttachment *frame, bool verbose) override;
int getAttachmentData(unsigned char **data, bool verbose);
//decryptdata
private:
int getEncryptedAttachment(FrameWithAttachment *frame, bool verbose);
inline int getRawAttachment(FrameWithAttachment *frame, bool verbose);
};
inline DesktopAttachmentReader::DesktopAttachmentReader(std::string const &path)
:
DesktopAttachmentReader(1, path, std::string(), 0)
{}
inline DesktopAttachmentReader::DesktopAttachmentReader(int version, std::string const &path, std::string const &key, uint64_t size)
:
d_version(version),
d_path(path),
d_key(key),
d_size(size)
{}
inline int DesktopAttachmentReader::getAttachment(FrameWithAttachment *frame, bool verbose)
{
if (d_version >= 2) [[likely]]
return getEncryptedAttachment(frame, verbose);
else
return getRawAttachment(frame, verbose);
}
inline int DesktopAttachmentReader::getRawAttachment(FrameWithAttachment *frame, bool verbose)
{
RawFileAttachmentReader raw(d_path);
return raw.getAttachment(frame, verbose);
}
#endif
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