URL
https://opencores.org/ocsvn/present/present/trunk
Subversion Repositories present
[/] [present/] [trunk/] [DecodeTesting/] [rtl/] [vhdl/] [pLayer_inv.vhd] - Rev 4
Compare with Previous | Blame | View Log
----------------------------------------------------------------------- ---- ---- ---- 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; 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;