121 lines
3.3 KiB
PHP
121 lines
3.3 KiB
PHP
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<?php
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/**
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* ownCloud
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*
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* @author Robin Appelman
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* @copyright 2011 Robin Appelman icewind1991@gmail.com
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU AFFERO GENERAL PUBLIC LICENSE
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* License as published by the Free Software Foundation; either
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* version 3 of the License, or any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU AFFERO GENERAL PUBLIC LICENSE for more details.
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*
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* You should have received a copy of the GNU Affero General Public
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* License along with this library. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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/**
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* transparently encrypted filestream
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*/
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class OC_CryptStream{
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private $source;
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public function stream_open($path, $mode, $options, &$opened_path){
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$path=str_replace('crypt://','',$path);
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$this->source=OC_FileSystem::fopen($path.'.enc',$mode);
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if(!is_resource($this->source)){
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OC_Log::write('files_encryption','failed to open '.$path.'.enc',OC_Log::ERROR);
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}
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return is_resource($this->source);
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}
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public function stream_seek($offset, $whence=SEEK_SET){
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fseek($this->source,$offset,$whence);
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}
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public function stream_tell(){
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return ftell($this->source);
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}
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public function stream_read($count){
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$pos=0;
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$currentPos=ftell($this->source);
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$offset=$currentPos%8192;
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fseek($this->source,-$offset,SEEK_CUR);
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$result='';
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while($count>$pos){
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$data=fread($this->source,8192);
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$pos+=8192;
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$result.=OC_Crypt::decrypt($data);
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}
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return substr($result,$offset,$count);
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}
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public function stream_write($data){
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$length=strlen($data);
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$written=0;
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$currentPos=ftell($this->source);
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if($currentPos%8192!=0){
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//make sure we always start on a block start
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fseek($this->source,-($currentPos%8192),SEEK_CUR);
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$encryptedBlock=fread($this->source,8192);
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fseek($this->source,-($currentPos%8192),SEEK_CUR);
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$block=OC_Crypt::decrypt($encryptedBlock);
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$data=substr($block,0,$currentPos%8192).$data;
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}
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while(strlen($data)>0){
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if(strlen($data)<8192){
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//fetch the current data in that block and append it to the input so we always write entire blocks
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$oldPos=ftell($this->source);
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$encryptedBlock=fread($this->source,8192);
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fseek($this->source,$oldPos);
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$block=OC_Crypt::decrypt($encryptedBlock);
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$data.=substr($block,strlen($data));
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}
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$encrypted=OC_Crypt::encrypt(substr($data,0,8192));
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fwrite($this->source,$encrypted);
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$data=substr($data,8192);
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}
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return $length;
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}
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public function stream_set_option($option,$arg1,$arg2){
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switch($option){
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case STREAM_OPTION_BLOCKING:
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stream_set_blocking($this->source,$arg1);
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break;
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case STREAM_OPTION_READ_TIMEOUT:
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stream_set_timeout($this->source,$arg1,$arg2);
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break;
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case STREAM_OPTION_WRITE_BUFFER:
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stream_set_write_buffer($this->source,$arg1,$arg2);
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}
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}
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public function stream_stat(){
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return fstat($this->source);
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}
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public function stream_lock($mode){
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flock($this->source,$mode);
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}
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public function stream_flush(){
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return fflush($this->source);
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}
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public function stream_eof(){
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return feof($this->source);
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}
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public function stream_close(){
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return fclose($this->source);
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}
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}
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