2. [代码][PHP]代码    

class CCEncode{
	
	public static $instance = NULL;
	
	public static function getInstance(){
		if(is_null(self::$instance)){
			self::$instance = new self;	
		}
		return self::$instance;
	}
	
	protected function getByte($data){
		$length = strlen($data);
		for($i = 0; $i < $length; $i ++){
			$tmpList[] = ord($data{$i});	
		}
		return $tmpList;
	}
	
	protected function getChar($data, $string = ''){
		$length = count($data);
		foreach($data as $value){
			$string .= chr($value);	
		}
		return $string;
	}
	
	public function encrypt($data, $key){
		$dataArr = $this->getByte($data);
		$keyArr = $this->getByte($key);
		$lengthA = count($dataArr);
		$lengthB = count($keyArr);
		for($i = 0; $i < $lengthA; $i ++){
			$tmpList[] = (0xFF & $dataArr[$i]) + (0xFF & $keyArr[$i % $lengthB]);
		}
		return implode('@', $tmpList);
	}
	
	public function decrypt($data, $key){
		$dataArr = explode('@', $data);
		$keyArr = $this->getByte($key);
		$lengthA = count($dataArr);
		$lengthB = count($keyArr);
		for($i = 0; $i < $lengthA; $i ++){
			$tmpList[] = $dataArr[$i] - (0xFF & $keyArr[$i % $lengthB]);
		}
		return $this->getChar($tmpList);
	}
		
}