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 <?php
 
 /** Êëàññ îñóùåñòâëÿþùèé ðàáîòó ñ øèôðîì ÃÎÑÒ 28147-89 (øèôðîâàíèå/äåøèôðîâàííèå äàííûõ)
  *
  * @author IntSys
  * @copyright Copyright (c) 2011-2013, IntSys, intsystem.org
  */
 class ClassGost{
 	/** Êîëè÷åñòî èòòåðàöèé îñíîâíîãî øàãà êðèïòîîáðàçîâàíèÿ
 	 */
 	const CNT_MAIN_STEP=32;
 
 	/** Òàáëèöà çàìåí
 	 *
 	 * @var array
 	 */
 	protected $s_block=array(
 		array(6,12,7,1,5,15,13,8,4,10,9,14,0,3,11,2),
 		array(14,11,4,12,6,13,15,10,2,3,8,1,0,7,5,9),
 		array(13,11,4,1,3,15,5,9,0,10,14,7,6,8,2,12),
 		array(7,13,10,1,0,8,9,15,14,4,6,12,11,2,5,3),
 		array(1,15,13,0,5,7,10,4,9,2,3,14,6,11,8,12),
 		array(4,10,9,2,13,8,0,14,6,11,1,12,7,15,5,3),
 		array(4,11,10,0,7,2,1,13,3,6,8,5,9,12,15,14),
 		array(5,8,1,13,10,3,4,2,14,15,12,7,6,0,9,11),
 
 	);
 
 	/** Êëþ÷
 	 *
 	 * @var array
 	 */
 	protected $k_block=array (
 		0x00000000,
 		0x00000000,
 		0x00000000,
 		0x00000000,
 		0x00000000,
 		0x00000000,
 		0x00000000,
 		0x00000000,
 	);
 
 
 	/** Çàøèôðîâàòü äàííûå
 	 *
 	 * @param string $data äàííûå äëÿ øèôðîâàíèÿ
 	 * @param mixed $key êëþ÷ øèôðîâàíèÿ
 	 * @param array $table òàáëèöà çàìåí
 	 * @return mixed âîçâðàùàåò çàøèôðîâàííóþ ñòðîêó, èëè false â ñëó÷àå íåóäà÷è
 	 */
 	function Encode($data, $key=null, $table=null){
 		if(!is_null($key)){
 			if(!$this->SetKey($key)){
 				return false;
 			}
 		}
 
 		if(!is_null($table)){
 			if(!$this->SetTableReplace($table)){
 				return false;
 			}
 		}
 
 		$blocks=$this->LoadData2Blocks($data);
 		$keys=$this->LoadKeysArray(self::CNT_MAIN_STEP);
 
 		$result='';
 
 		foreach($blocks as $block){
 			$result.=$this->Global_MainStep($block, $keys);
 
 		}
 
 		return $result;
 	}
 
 	/** Ðàñøèôðîâàòü äàííûå
 	 *
 	 * @param string $data çàøèôðîâàííûå äàííûå
 	 * @param mixed $key êëþ÷ øèôðîâàíèÿ
 	 * @param array $table òàáëèöà çàìåí
 	 * @return mixed âîçâðàùàåò èñõîäíûå äàííûå, èëè false â ñëó÷àå íåóäà÷è
 	 */
 	function Decode($data, $key=null, $table=null){
 		if(!is_null($key)){
 			if(!$this->SetKey($key)){
 				return false;
 			}
 		}
 
 		if(!is_null($table)){
 			if(!$this->SetTableReplace($table)){
 				return false;
 			}
 		}
 
 		$blocks=$this->LoadData2Blocks($data);
 		$keys=array_reverse($this->LoadKeysArray(self::CNT_MAIN_STEP));
 
 		$result='';
 		foreach($blocks as $block){
 			$result.=$this->Global_MainStep($block, $keys);
 		}
 
 		return $result;
 	}
 
 	/** Óñòàíîâèòü êëþ÷ øèôðîâàíèÿ<br><br>
 	 * Âîçìîæíî óêàçàòü êëþ÷ â äâóõ ôîðìàòàõ:<br>
 	 *  - Ñòðîêà äëèííîé â 32 áàéòà<br>
 	 *  - Ìàññèâ èç 8 ýëåìåíòîâ, ãäå êàæäûé ýëåìåíò - 4 áàéòîâîå ÷èñëî integer<br><br>
 	 * Ïðè ýòîì ëþáîå îòêëîíåíèå îò äàííûõ ôîðìàòîâ áóäåò âûçûâàòü îøèáêó
 	 *
 	 * @param mixed $key êëþ÷ øèôðîâàíèÿ
 	 * @return boolen âîçâðàùàåò true åñëè óäàëîñü óñòàíîâèòü êëþ÷ øèôðîâàíèÿ, false - åñëè ïðîèçîøëà îøèáêà
 	 */
 	function SetKey($key){
 		if(is_string($key)){
 			if(strlen($key)!==32){
 				trigger_error(__METHOD__.': "$key" length must be equal to 256 bits (32 bytes)', E_USER_WARNING);
 				return false;
 			}
 
 			$new_key=array();
 			for($i=0; $i<32; $i+=4){
 	//			$tmp=(int)hexdec(bin2hex(substr($key, ($i*4), 4)));
 				$tmp=(int)hexdec(bin2hex(substr($key, ($i), 4)));
 				$new_key[]=$tmp;
 			}
 
 			$this->k_block=$new_key;
 			return true;
 		}elseif(is_array($key)){
 			if(count($key)!=8){
 				trigger_error(__METHOD__.': count of elements in the array "$key" must be equal to 8', E_USER_WARNING);
 				return false;
 			}
 			$new_key=array();
 			foreach($key as $k => $val){
 				if(!is_integer($val)){
 					trigger_error(__METHOD__.': every element of the array "$key" must be integer. The array element "$table['.htmlspecialchars($k).']" is not an integer.', E_USER_WARNING);
 					return false;
 				}
 
 				$new_key[]=$val;
 			}
 
 			$this->k_block=$new_key;
 			return true;
 		}else{
 			trigger_error(__METHOD__.': unknown "$Key" format. "$key" must be array[8] of integer or 32-bytes string.', E_USER_WARNING);
 			return false;
 		}
 	}
 
 	/** Óñòàíîâèòü òàáëèöó çàìåí.<br>
 	 * Ôîðìàò òàáëèöû çàìåí - ìàòðèöà ðàçìåðíîñòüþ 8x16,
 	 * êàæäûé åå ýëåìåíò áîëüøå ëèáî ðàâåí 0 è ìåíüøå ëèáî ðàâåí 15,
 	 * ïðè ýòîì â êàæäîé ñòðîêå íå äîëæíî áûòü ïîâòîðÿþùèõñÿ çíà÷åíèé.<br><br>
 	 * Òàêæå îáðàòèòå âíèìàíèå ÷òî íåïðàâèëüíûé âûáîð òàáëèöû çàìåí, ìîæåò
 	 * ïðèâåñòè ê ñíèæåíèþ ñòîéêîñòè øèôðà.
 	 *
 	 * @example
 	 * Ïðèìåð òàáëèöû:<br>
 	 * array(6 ,12,7 ,1 ,5 ,15,13,8 ,4 ,10,9 ,14,0 ,3 ,11,2 ),<br>
 	 * array(14,11,4 ,12,6 ,13,15,10,2 ,3 ,8 ,1 ,0 ,7 ,5 ,9 ),<br>
 	 * array(13,11,4 ,1 ,3 ,15,5 ,9 ,0 ,10,14,7 ,6 ,8 ,2 ,12),<br>
 	 * array(7 ,13,10,1 ,0 ,8 ,9 ,15,14,4 ,6 ,12,11,2 ,5 ,3 ),<br>
 	 * array(1 ,15,13,0 ,5 ,7 ,10,4 ,9 ,2 ,3 ,14,6 ,11,8 ,12),<br>
 	 * array(4 ,10,9 ,2 ,13,8 ,0 ,14,6 ,11,1 ,12,7 ,15,5 ,3 ),<br>
 	 * array(4 ,11,10,0 ,7 ,2 ,1 ,13,3 ,6 ,8 ,5 ,9 ,12,15,14),<br>
 	 * array(5 ,8 ,1 ,13,10,3 ,4 ,2 ,14,15,12,7 ,6 ,0 ,9 ,11),<br>
 	 *
 	 * @param array $table òàáëèöà çàìåí
 	 * @return boolean âîçâðàùàåò true åñëè óäàëîñü óñòàíîâèòü òàáëèöó çàìåí, false- åñëè ïðîèçîøëà îøèáêà
 	 */
 	function SetTableReplace($table){
 		if(!is_array($table)){
 			trigger_error(__METHOD__.': "$table" must be array', E_USER_WARNING);
 			return false;
 		}
 
 		if(count($table)!=8){
 			trigger_error(__METHOD__.': count of elements in the array "$table" must be equal to 8', E_USER_WARNING);
 			return false;
 		}
 
 		$i=0;
 		$new_array=array();
 		foreach($table as $key => $val){
 			if(!is_array($val)){
 				trigger_error(__METHOD__.': $table['.htmlspecialchars($key).'] must be array', E_USER_WARNING);
 				return false;
 			}
 
 			if(count($val)!=16){
 				trigger_error(__METHOD__.': count of elements in the array "$table['.htmlspecialchars($key).']" must be equal to 16', E_USER_WARNING);
 				return false;
 			}
 
 
 			$new_val=array();
 			foreach($val as $int_key => $int_val){
 				if(!is_integer($int_val)){
 					trigger_error(__METHOD__.': every element of the array "$table['.htmlspecialchars($key).']" must be integer. The array element "$table['.htmlspecialchars($key).']['.htmlspecialchars($int_key).']" is not an integer.', E_USER_WARNING);
 					return false;
 				}
 
 				if($int_val>15 || $int_val<0){
 					trigger_error(__METHOD__.': every element of the array "$table['.htmlspecialchars($key).']" must be greater than or equal to 0 and less than or equal to 15. The array element "$table['.htmlspecialchars($key).']['.htmlspecialchars($int_key).']" is not in this range.', E_USER_WARNING);
 					return false;
 				}
 				$new_val[]=$int_val;
 			}
 
 			$new_array[$i]=$new_val;
 			$i++;
 		}
 
 
 		$this->s_block=$new_array;
 		return true;
 	}
 
 	/** Îñíîâíîé øàã øèôðîîáðàçîâàíèÿ
 	 *
 	 * @param string $block øèôðóåìûé áëîê
 	 * @param array $keys ïîäãîòîâëåííûé ìàññèâ ñ êëþ÷àìè
 	 * @param intger $cnt_repeat [îïöèîíàëüíî] êîëè÷åñòâî ïðåîáðàçîâàíèé
 	 * @return string
 	 */
 	protected function Global_MainStep($block, $keys, $cnt_repeat=self::CNT_MAIN_STEP){
 		$this->Global_BlockExplode($block, $n1, $n2);
 
 		if(count($keys)<$cnt_repeat){
 			$cnt_repeat=count($keys);
 		}
 
 		for($i=0; $i<$cnt_repeat; $i++){
 			$val=$this->Global_SummMod32($n1, $keys[$i]);
 
 			$val=$this->Global_BlockReplace($val);
 
 			$val=$this->Global_BlockCycleShift($val, 21);
 
 			$val=$val ^ $n2;
 
 			$n2=$n1;
 			$n1=$val;
 		}
 
 		$this->Global_BlockImplode($block, $n2, $n1);
 		return $block;
 	}
 
 	/** Ôóíêöèÿ öèêëè÷íîãî ïîáèòîâîãî ñäâèãà âïðàâî
 	 *
 	 * @param integer $block
 	 * @param integer $bits êîëè÷åñòâî áèòîâ äëÿ ñäâèãà
 	 * @return integer
 	 */
 	protected function Global_BlockCycleShift($block, $bits){
 		if($bits>0){
 			$a=$bits;
 			$b=32-$a;
 			$block=(($block >> $a) & ~(-pow(2,$b)))^($block << $b);
 		}
 		return $block;
 	}
 
 	/** Çàìåíà ïî òàáëèöå çàìåí
 	 *
 	 * @param integer $block òåêóùèé áëîê äëÿ çàìåíû
 	 * @return integer
 	 */
 	protected function Global_BlockReplace($block){
 		$new_block=0;
 
 		for($i=0; $i<8; $i++){
 			//Âû÷ëåíÿåì íóæíûå 4 áèòà ïîä çàìåíó
 			$rem=$block>>(4*($i+1));
 			$rem=$rem<<(4*($i+1));
 
 			if($i==7){
 				$hex=$rem;
 			}else{
 				$hex=$block-$rem;
 				$block=$rem;
 			}
 
 			$hex=$this->Global_BlockCycleShift($hex,(4*$i));
 
 			//Íàõîäèì íà êàêîå ÷èñëî åãî çàìåíÿòü ïî òàáëèöå çàìåí
 			$replace=$this->s_block[$i][$hex];
 
 			//Çàìåíÿåì
 			$new_block=$new_block + (pow(16, $i)*$replace);
 		}
 
 		return $new_block;
 	}
 
 	/** Ñóììèðîâàíèå äâóõ ÷èñåë ïî ìîäóëþ 32
 	 *
 	 * @param integer $bin1 ÷èñëî (4 áàéòà)
 	 * @param integer $bin2 ÷èñëî (4 áàéòà)
 	 * @return integer ðåçóëüòàò âû÷èñëåíèÿ (4 áàéòà)
 	 */
 	protected function Global_SummMod32($bin1, $bin2){
 		$summ=$this->NormalizeInteger32(intval($bin1 + $bin2));
 
 		return $summ;
 	}
 
 	/** Ðàçáèåíèå áëîêà íà "ïðàâóþ" è "ëåâóþ" ÷àñòü
 	 *
 	 * @param string $block âõîäíîé áëîê (8 áàéò)
 	 * @param &integer $left ëåâàÿ ÷àñòü (íàêîïèòåëü N1) (4 áàéòà)
 	 * @param &integer $right ïðàâàÿ ÷àñòü (íàêîïèòåëü N2) (4 áàéòà)
 	 */
 	protected function Global_BlockExplode($block, &$left, &$right){
 		$left='';
 		$right='';
 
 		$left=substr($block, 0, 4);
 		$right=substr($block, 4, 4);
 
 		$left =hexdec(bin2hex($left ));
 		$right=hexdec(bin2hex($right));
 	}
 
 	/** Ðàçáèåíèå áëîêà íà "ïðàâóþ" è "ëåâóþ" ÷àñòü
 	 *
 	 * @param &string $block âõîäíîé áëîê (8 áàéò)
 	 * @param integer $left ëåâàÿ ÷àñòü (íàêîïèòåëü N1) (4 áàéòà)
 	 * @param integer $right ïðàâàÿ ÷àñòü (íàêîïèòåëü N2) (4 áàéòà)
 	 */
 	protected function Global_BlockImplode(&$block, $left, $right){
 		$left =sprintf("%08x", $left );
 		$right=sprintf("%08x", $right);
 
 		$block='';
 
 		$arr=str_split($left, 2);
 		foreach($arr as $hex){
 			$block.=chr(hexdec($hex));
 		}
 
 		$arr=str_split($right, 2);
 		foreach($arr as $hex){
 			$block.=chr(hexdec($hex));
 		}
 	}
 
 	/** Ãåíåðèðóåì ìàññèâ ñ êëþ÷àìè
 	 *
 	 * @param integer $cnt_repeat êîëè÷åñòâî êëþ÷åé
 	 * @return array
 	 */
 	protected function LoadKeysArray($cnt_repeat=self::CNT_MAIN_STEP){
 		$key_block=array();
 		for($i=0; $i<$cnt_repeat; $i++){
 			if($i<($cnt_repeat-8)){
 				$x=$i % 8;
 			}else{
 				$x=7 - ($i % 8);
 			}
 			$key_block[]=$this->k_block[$x];
 		}
 
 		return $key_block;
 	}
 
 	/** Ðàçáèâàåì äàííûå íà áëîêè ïî 64 áèòà (8 áàéò)
 	 *
 	 * @param string $data âõîäíûå äàííûå
 	 * @param integer $block_size [îïöèîíàëüíî] (64 - äåôîëò) ðàçìåðíîñòü áëîêîâ
 	 * @return array âûõîäíîé ìàññèâ ñ áëîêàìè
 	 */
 	protected function LoadData2Blocks($data, $block_size=64){
 		$blocks=array();
 
 		$block_len=(int)$block_size / 8;
 
 		for($i=0, $x=(ceil(strlen($data)/$block_len)); $i<$x; $i++){
 			$blocks[$i]=substr($data, ($i*$block_len), $block_len);
 
 			if($i==($x-1)){
 				//Åñëè ïîñëåäíèé áëîê íå ïîëîí, òî äîïîëíÿåì åãî íóëÿìè
 				$blocks[$i]=str_pad($blocks[$i], $block_len, chr(0), STR_PAD_RIGHT);
 
 			}
 		}
 
 		return $blocks;
 	}
 
 	/** Ïðåâåäåíèå 64áèòíîãî integer ê "32áèòíîìó" íà 64áèòíûõ ñèñòåìàõ
 	 *
 	 * @param integer $number
 	 */
 	private function NormalizeInteger32($number){
 		static $is_64bit=null;
 
 		$number=intval($number);
 
 		if(is_null($is_64bit)){
 			if(intval(2147483647+1)>0){
 				$is_64bit=true;
 			}else{
 				$is_64bit=false;
 			}
 		}
 
 		if($is_64bit){
 			static $int=null;
 
 			if(is_null($int)){
 				$int=0;
 
 				//Ãåíåðèðóåì ÷èñëî ó êîòîðîãî â äâîè÷íîì ïðåäñòàâëåíèè ìëàäøèå 32 áèòà - åäèíèöû, îñòàëüíûå - íóëè
 				//
 				// 32-áèòíûõ ñèñòåìàõ ýòî ÷èñëî "-1"
 				//Â 64-áèòíûõ - "4294967295"
 				for($i=0; $i<32; $i++){
 					$int=$int | (1<<$i);
 				}
 			}
 
 			//Ïîáèòîâîå AND
 			$number=intval($number & $int);
 		}
 
 		return $number;
 	}
 }