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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:                                                  ----
 
----     Top level of present encoder. For more information see    ----
 
---- below and 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;
 
use IEEE.NUMERIC_STD.ALL;
 
 
 
entity PresentEnc is
 
        generic (
 
                        w_2: integer := 2;
 
                        w_4: integer := 4;
 
                        w_5: integer := 5;
 
                        w_32: integer := 32;
 
                        w_64: integer := 64;
 
                        w_80: integer := 80
 
        );
 
        port(
 
                plaintext  : in std_logic_vector(w_64 - 1 downto 0);
 
                key               : in std_logic_vector(w_80 - 1 downto 0);
 
                ciphertext : out std_logic_vector(w_64 - 1 downto 0);
 
                start, clk, reset : in std_logic;
 
                ready : out std_logic
 
        );
 
end PresentEnc;
 
 
 
architecture Behavioral of PresentEnc is
 
 
 
        component Reg is
 
                generic(width : integer := w_64);
 
                port(
 
                        input  : in  STD_LOGIC_VECTOR(width - 1 downto 0);
 
                        output : out STD_LOGIC_VECTOR(width - 1 downto 0);
 
                        enable : in  STD_LOGIC;
 
                        clk    : in  STD_LOGIC;
 
                        reset  : in  STD_LOGIC
 
                );
 
        end component Reg;
 
 
 
        component AsyncMux is
 
                generic (
 
                        width : integer := 64
 
        );
 
        port (
 
                input0 : in  STD_LOGIC_VECTOR(width - 1 downto 0);
 
                input1 : in  STD_LOGIC_VECTOR(width - 1 downto 0);
 
                ctrl   : in  STD_LOGIC;
 
                output : out STD_LOGIC_VECTOR(width - 1 downto 0)
 
        );
 
        end component AsyncMux;
 
 
 
        component PresentStateMachine is
 
                generic (
 
                        w_5 : integer := 5
 
                );
 
                port (
 
                        clk, reset, start : in std_logic;
 
                        ready, cnt_res, ctrl_mux, RegEn: out std_logic;
 
                        num : in std_logic_vector (w_5-1 downto 0)
 
                );
 
        end component;
 
 
 
        -- substitution layer for decoding
 
        component 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 component;
 
 
 
        -- permutation layer for decoding
 
        component pLayer 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 component;
 
 
 
        -- key update for decoding
 
        component keyupd is
 
                generic(
 
                        w_5 : integer := 5;
 
                        w_80: integer := 80
 
                );
 
                port(
 
                        num : in std_logic_vector(w_5-1 downto 0);
 
                        key : in std_logic_vector(w_80-1 downto 0);
 
                        keyout : out std_logic_vector(w_80-1 downto 0)
 
                );
 
        end component;
 
 
 
        -- counter for decoding. It is counting up!!!
 
        component counter is
 
                generic (
 
                        w_5 : integer := 5
 
                );
 
                port (
 
                        clk, reset, cnt_res : in std_logic;
 
                        num : out std_logic_vector (w_5-1 downto 0)
 
                );
 
        end component;
 
 
 
        -- signals
 
 
 
        signal keynum : std_logic_vector (w_5-1 downto 0);
 
        signal toXor, ciph, P, Pout, textToReg : std_logic_vector (w_64-1 downto 0);
 
        signal keyfout, kupd, keyToReg : std_logic_vector (w_80-1 downto 0);
 
        signal ready_sig, mux_ctrl,  cnt_res, RegEn : std_logic;
 
 
 
        begin
 
 
 
                -- connections
 
 
 
                mux_64: AsyncMux generic map(width => w_64) port map(
 
                        input0 => plaintext,
 
                        input1 => Pout,
 
                        ctrl => mux_ctrl,
 
                        output => textToReg
 
                );
 
                regText : Reg generic map(width => w_64) port map(
 
                        input  => textToReg,
 
                        output  => toXor,
 
                        enable  => RegEn,
 
                        clk  => clk,
 
                        reset  => reset
 
                );
 
                mux_80: AsyncMux generic map(width => w_80) port map(
 
                        input0 => key,
 
                        input1 => kupd,
 
                        ctrl => mux_ctrl,
 
                        output => keyToReg
 
                );
 
                regKey : Reg generic map(width => w_80) port map(
 
                        input  => keyToReg,
 
                        output  => keyfout,
 
                        enable  => RegEn,
 
                        clk  => clk,
 
                        reset  => reset
 
                );
 
                slayers : for N in 15 downto 0 generate
 
                        s_x: slayer port map(
 
                                input => ciph(4*N+3 downto 4*N),
 
                                output => P(4*N+3 downto 4*N)
 
                        );
 
                end generate slayers;
 
                p1: pLayer port map(
 
                        input => P,
 
                        output => Pout
 
                );
 
                mixer: keyupd port map(
 
                        key => keyfout,
 
                        num => keynum,
 
                        keyout => kupd
 
                );
 
                SM: PresentStateMachine port map(
 
                        start => start,
 
                        reset => reset,
 
                        ready => ready_sig,
 
                        cnt_res => cnt_res,
 
                        ctrl_mux => mux_ctrl,
 
                        clk => clk,
 
                        num => keynum,
 
                        RegEn => RegEn
 
                );
 
                count: counter port map(
 
                        clk => clk,
 
                        reset => reset,
 
                        cnt_res => cnt_res,
 
                        num => keynum
 
                );
 
                ciph <= toXor xor keyfout(79 downto 16);
 
                ciphertext <= ciph;
 
                ready <= ready_sig;
 
end Behavioral;
 
 
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