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-----------------------------------------------------------------------
 
----                                                               ----
 
---- Present - a lightweight block cipher project                  ----
 
----                                                               ----
 
---- This file is part of the Present - a lightweight block        ----
 
---- cipher project                                                ----
 
---- http://www.http://opencores.org/project,present               ----
 
----                                                               ----
 
---- Description:                                                  ----
 
----     Permutation layer of Present decoder. Simple signal       ----
 
---- mixing, but in inverse way as cipher. For more information see----
 
---- http://homes.esat.kuleuven.be/~abogdano/papers/               ----
 
---- present_ches07.pdf                                            ----
 
---- To Do:                                                        ----
 
----                                                               ----
 
---- Author(s):                                                    ----
 
---- - Krzysztof Gajewski, gajos@opencores.org                     ----
 
----                       k.gajewski@gmail.com                    ----
 
----                                                               ----
 
-----------------------------------------------------------------------
 
----                                                               ----
 
---- Copyright (C) 2013 Authors and OPENCORES.ORG                  ----
 
----                                                               ----
 
---- 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 source file is free software; you can redistribute it    ----
 
---- and-or modify it under the terms of the GNU Lesser General    ----
 
---- Public License as published by the Free Software Foundation;  ----
 
---- either version 2.1 of the License, or (at your option) any    ----
 
---- later version.                                                ----
 
----                                                               ----
 
---- This source is distributed in the hope that it will be        ----
 
---- useful, but WITHOUT ANY WARRANTY; without even the implied    ----
 
---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR       ----
 
---- PURPOSE. See the GNU Lesser General Public License for more   ----
 
---- details.                                                      ----
 
----                                                               ----
 
---- You should have received a copy of the GNU Lesser General     ----
 
---- Public License along with this source; if not, download it    ----
 
---- from http://www.opencores.org/lgpl.shtml                      ----
 
----                                                               ----
 
-----------------------------------------------------------------------
 
library IEEE;
 
use IEEE.STD_LOGIC_1164.ALL;
 
use IEEE.STD_LOGIC_ARITH.ALL;
 
use IEEE.STD_LOGIC_UNSIGNED.ALL;
 
 
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entity pLayer_inv is
 
        generic(w_64 : integer := 64);
 
        port (
 
                input : in std_logic_vector(w_64-1 downto 0);
 
                output : out std_logic_vector(w_64-1 downto 0)
 
        );
 
end pLayer_inv;
 
 
 
architecture Behavioral of pLayer_inv is
 
begin
 
                        output(0) <= input(0);
 
                        output(1) <= input(16);
 
                        output(2) <= input(32);
 
                        output(3) <= input(48);
 
                        output(4) <= input(1);
 
                        output(5) <= input(17);
 
                        output(6) <= input(33);
 
                        output(7) <= input(49);
 
                        output(8) <= input(2);
 
                        output(9) <= input(18);
 
                        output(10) <= input(34);
 
                        output(11) <= input(50);
 
                        output(12) <= input(3);
 
                        output(13) <= input(19);
 
                        output(14) <= input(35);
 
                        output(15) <= input(51);
 
                        output(16) <= input(4);
 
                        output(17) <= input(20);
 
                        output(18) <= input(36);
 
                        output(19) <= input(52);
 
                        output(20) <= input(5);
 
                        output(21) <= input(21);
 
                        output(22) <= input(37);
 
                        output(23) <= input(53);
 
                        output(24) <= input(6);
 
                        output(25) <= input(22);
 
                        output(26) <= input(38);
 
                        output(27) <= input(54);
 
                        output(28) <= input(7);
 
                        output(29) <= input(23);
 
                        output(30) <= input(39);
 
                        output(31) <= input(55);
 
                        output(32) <= input(8);
 
                        output(33) <= input(24);
 
                        output(34) <= input(40);
 
                        output(35) <= input(56);
 
                        output(36) <= input(9);
 
                        output(37) <= input(25);
 
                        output(38) <= input(41);
 
                        output(39) <= input(57);
 
                        output(40) <= input(10);
 
                        output(41) <= input(26);
 
                        output(42) <= input(42);
 
                        output(43) <= input(58);
 
                        output(44) <= input(11);
 
                        output(45) <= input(27);
 
                        output(46) <= input(43);
 
                        output(47) <= input(59);
 
                        output(48) <= input(12);
 
                        output(49) <= input(28);
 
                        output(50) <= input(44);
 
                        output(51) <= input(60);
 
                        output(52) <= input(13);
 
                        output(53) <= input(29);
 
                        output(54) <= input(45);
 
                        output(55) <= input(61);
 
                        output(56) <= input(14);
 
                        output(57) <= input(30);
 
                        output(58) <= input(46);
 
                        output(59) <= input(62);
 
                        output(60) <= input(15);
 
                        output(61) <= input(31);
 
                        output(62) <= input(47);
 
                        output(63) <= input(63);
 
end Behavioral;
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