-----------------------------------------------------------------------				(c) Copyright 2006, CoreTex Systems, LLC					 ----		                   www.coretexsys.com                        --    --                                                            		 ----		This source file may be used and distributed without         ----		restriction provided that this copyright statement is not    ----		removed from the file and that any derivative work contains  ----		the original copyright notice and the associated disclaimer. ----                                                            		 ----		    THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY      ----		EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED    ----		TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS    ----		FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR       ----		OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,          ----		INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES     ----		(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE    ----		GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR         ----		BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF   ----		LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT   ----		(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT   ----		OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE          ----		POSSIBILITY OF SUCH DAMAGE.                                  ----																						 ----------------------------------------------------------------------------------------------------------------------------------------------- Poject structure: --  |- tdes_top.vhd--  |--    |- des_cipher_top.vhd--    |- des_top.vhd--      |- block_top.vhd--        |- add_key.vhd--        |--        |- add_left.vhd--        |--				|- e_expansion_function.vhd--				|--				|- p_box.vhd--				|--				|- s_box.vhd--            |- s1_box.vhd--            |- s2_box.vhd--            |- s3_box.vhd--            |- s4_box.vhd--            |- s5_box.vhd--            |- s6_box.vhd--            |- s7_box.vhd--            |- s8_box.vhd--    |- key_schedule.vhd----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Title       : p_box-- Company     : CoreTex Systems, LLC-----------------------------------------------------------------------------------------------------library IEEE;use IEEE.STD_LOGIC_1164.ALL;use IEEE.STD_LOGIC_ARITH.ALL;use IEEE.STD_LOGIC_UNSIGNED.ALL;entity p_box isport(    		x0_in: in std_logic_vector(3 downto 0);			x1_in: in std_logic_vector(3 downto 0);			x2_in: in std_logic_vector(3 downto 0);			x3_in: in std_logic_vector(3 downto 0);			x4_in: in std_logic_vector(3 downto 0);			x5_in: in std_logic_vector(3 downto 0);			x6_in: in std_logic_vector(3 downto 0);			x7_in: in std_logic_vector(3 downto 0);			x_out: out std_logic_vector(0 to 31) 	);end p_box;architecture Behavioral of p_box issignal x_in: std_logic_vector(0 to 31);begin		x_in 	<= x0_in & x1_in & x2_in & x3_in & x4_in & x5_in & x6_in & x7_in;		x_out <= x_in(15) & x_in(6) & x_in(19) & x_in(20) & x_in(28) & x_in(11) & 					x_in(27) & x_in(16) & x_in(0) & x_in(14) & x_in(22) & x_in(25) & 					x_in(4) & x_in(17) & x_in(30) & x_in(9) & x_in(1) & x_in(7) & 					x_in(23) & x_in(13) & x_in(31) & x_in(26) & x_in(2) & x_in(8) & 					x_in(18) & x_in(12) & x_in(29) & x_in(5) & x_in(21) & x_in(10) & 					x_in(3) & x_in(24);end Behavioral;