public function cryptography( $string, $key, $method )
	{
		if ( $method == "encrypt" )
		{
			return $this->cryptography_encrypt( $string, $key );
		}
		else
		{
			return $this->cryptography_decrypt( $string, $key );
		}
	}
	
	private function cryptography_encrypt( $string, $key )
	{
		$adjust_vals = $this->cryptography_gen_key( $key );
		
		$final_string = "";
		$factor_2 = 0;
	
		while ( strlen( $string ) < $this->hash_length )
		{
			$string .= ' '; 
		}	
		
		for ( $i = 0; $i < strlen( $string ); $i++ )
		{
			$char_1 = substr( $string, $i, 1); 
			$num_1 = strpos( $this->salt_1, $char_1 );
 
			$adjust_val = array_shift( $adjust_vals );
			$adjust_val = $adjust_val + 3;
			$adjust_val_array[] = $adjust_val;
 
			$factor = $factor_2 + $adjust_val;  
         
			$num_2 = round( $factor ) + $num_1;  
                
			$num_2 = $this->cryptography_check( $num_2 );

			$factor_2 = $factor + $num_2;
			                
			$char_2 = substr( $this->salt_2, $num_2, 1 ); 
			$final_string .= $char_2;
		}
		
		return $final_string;
	}
	
	private function cryptography_decrypt( $string, $key )
	{
		$adjust_vals = $this->cryptography_gen_key( $key );
		
		$final_string = "";
		$factor_2 = 0;
	
		while ( strlen( $string ) < $this->hash_length )
		{
			$string .= ' '; 
		}	
		
		for ( $i = 0; $i < strlen( $string ); $i++ )
		{
			$char_2 = substr( $string, $i, 1); 
			$num_2 = strpos( $this->salt_2, $char_2 );
 
			$adjust_val = array_shift( $adjust_vals );
			$adjust_val = $adjust_val + 3;
			$adjust_val_array[] = $adjust_val;
 
			$factor = $factor_2 + $adjust_val;  
         
			$num_1 = $num_2 - round( $factor );                 
			$num_1 = $this->cryptography_check( $num_1 );

			$factor_2 = $factor + $num_2;
			                
			$char_1 = substr( $this->salt_1, $num_1, 1 ); 
			$final_string .= $char_1;
		}
		
		return rtrim( $final_string );
	}
	
	private function cryptography_gen_key( $key )
	{
      $array[] = strlen($key);

      $tot = 0;  
      for ($i = 0; $i < strlen($key); $i++) {
         $char = substr($key, $i, 1); 
         $num = strpos($this->salt_1, $char); 

         $array[] = $num; 
         $tot = $tot + $num;

      } // for 
       
      $array[] = $tot; 
      
     
       
      return $array; 	
	}