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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:                                                  ----
 
----     Substitution layer of Present cipher. Simple logic.       ----
 
---- 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 slayer is
 
        generic (
 
                w_4 : integer := 4
 
        );
 
        port (
 
                input : in std_logic_vector(w_4-1 downto 0);
 
                output : out std_logic_vector(w_4-1 downto 0)
 
        );
 
end slayer;
 
 
 
architecture Behavioral of slayer is
 
 
 
        begin
 
                output <= x"C" when input = x"0" else
 
                                         x"5" when input = x"1" else
 
                                         x"6" when input = x"2" else
 
                                         x"B" when input = x"3" else
 
                                         x"9" when input = x"4" else
 
                                         x"0" when input = x"5" else
 
                                         x"A" when input = x"6" else
 
                                         x"D" when input = x"7" else
 
                                         x"3" when input = x"8" else
 
                                         x"E" when input = x"9" else
 
                                         x"F" when input = x"A" else
 
                                         x"8" when input = x"B" else
 
                                         x"4" when input = x"C" else
 
                                         x"7" when input = x"D" else
 
                                         x"1" when input = x"E" else
 
                                         x"2" when input = x"F" else
 
                                         "ZZZZ";
 
        end Behavioral;
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