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-- Copyright (c) 2013 Antonio de la Piedra

-- This program is free software: you can redistribute it and/or modify

-- it under the terms of the GNU General Public License as published by

-- the Free Software Foundation, either version 3 of the License, or

-- (at your option) any later version.

-- This program 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 General Public License for more details.

-- You should have received a copy of the GNU General Public License

-- along with this program.  If not, see <http://www.gnu.org/licenses/>.

library IEEE;

use IEEE.STD_LOGIC_1164.ALL;

entity des_loop is

        port(clk :  in std_logic;

                  rst : in std_logic;

                  mode : in std_logic; -- 0 encrypt, 1 decrypt

                  key_in : in std_logic_vector(63 downto 0);

                  blk_in : in std_logic_vector(63 downto 0);

                  blk_out : out std_logic_vector(63 downto 0));

end des_loop;

architecture Behavioral of des_loop is

        signal after_ip_s : std_logic_vector(63 downto 0);

        signal after_ip_minus_one_s : std_logic_vector(63 downto 0);

        signal after_f_s : std_logic_vector(31 downto 0);

        signal final_s : std_logic_vector(63 downto 0);

        component des_round is

                port(clk : in std_logic;

                          l_0 : in std_logic_vector(31 downto 0);

                     r_0 : in std_logic_vector(31 downto 0);

                     k_i : in std_logic_vector(47 downto 0);

                     l_1 : out std_logic_vector(31 downto 0);

                     r_1 : out std_logic_vector(31 downto 0));

        end component;

        component key_schedule is

                port(clk : in std_logic;

                          rst : in std_logic;

                     mode : in std_logic; -- 0 encrypt, 1 decrypt

                key : in std_logic_vector(63 downto 0);

                     key_out : out std_logic_vector(47 downto 0));

        end component;

        signal key_s : std_logic_vector(47 downto 0);

        signal l_0_s : std_logic_vector(31 downto 0);

        signal l_1_s : std_logic_vector(31 downto 0);

        signal l_2_s : std_logic_vector(31 downto 0);

        signal l_3_s : std_logic_vector(31 downto 0);

        signal l_4_s : std_logic_vector(31 downto 0);

        signal l_5_s : std_logic_vector(31 downto 0);

        signal l_6_s : std_logic_vector(31 downto 0);

        signal l_7_s : std_logic_vector(31 downto 0);

        signal l_8_s : std_logic_vector(31 downto 0);

        signal l_9_s : std_logic_vector(31 downto 0);

        signal l_10_s : std_logic_vector(31 downto 0);

        signal l_11_s : std_logic_vector(31 downto 0);

        signal l_12_s : std_logic_vector(31 downto 0);

        signal l_13_s : std_logic_vector(31 downto 0);

        signal l_14_s : std_logic_vector(31 downto 0);

        signal l_15_s : std_logic_vector(31 downto 0);

        signal l_16_s : std_logic_vector(31 downto 0);

        signal r_0_s : std_logic_vector(31 downto 0);

        signal r_1_s : std_logic_vector(31 downto 0);

        signal r_2_s : std_logic_vector(31 downto 0);

        signal r_3_s : std_logic_vector(31 downto 0);

        signal r_4_s : std_logic_vector(31 downto 0);

        signal r_5_s : std_logic_vector(31 downto 0);

        signal r_6_s : std_logic_vector(31 downto 0);

        signal r_7_s : std_logic_vector(31 downto 0);

        signal r_8_s : std_logic_vector(31 downto 0);

        signal r_9_s : std_logic_vector(31 downto 0);

        signal r_10_s : std_logic_vector(31 downto 0);

        signal r_11_s : std_logic_vector(31 downto 0);

        signal r_12_s : std_logic_vector(31 downto 0);

        signal r_13_s : std_logic_vector(31 downto 0);

        signal r_14_s : std_logic_vector(31 downto 0);

        signal r_15_s : std_logic_vector(31 downto 0);

        signal r_16_s : std_logic_vector(31 downto 0);

        signal k_0_s : std_logic_vector(47 downto 0);

        signal k_1_s : std_logic_vector(47 downto 0);

        signal k_2_s : std_logic_vector(47 downto 0);

        signal k_3_s : std_logic_vector(47 downto 0);

        signal k_4_s : std_logic_vector(47 downto 0);

        signal k_5_s : std_logic_vector(47 downto 0);

        signal k_6_s : std_logic_vector(47 downto 0);

        signal k_7_s : std_logic_vector(47 downto 0);

        signal k_8_s : std_logic_vector(47 downto 0);

        signal k_9_s : std_logic_vector(47 downto 0);

        signal k_10_s : std_logic_vector(47 downto 0);

        signal k_11_s : std_logic_vector(47 downto 0);

        signal k_12_s : std_logic_vector(47 downto 0);

        signal k_13_s : std_logic_vector(47 downto 0);

        signal k_14_s : std_logic_vector(47 downto 0);

        signal k_15_s : std_logic_vector(47 downto 0);

        signal rst_s : std_logic;

begin

        pr_rst_delay : process(clk, rst)

        begin

                if rising_edge(clk) then

                        rst_s <= rst;

                end if;

        end process;

        -- IP

        pr_seq: process(clk, rst_s, blk_in)

        begin

                if rst_s = '1' then

                        l_0_s <= blk_in(6) & blk_in(14) & blk_in(22) & blk_in(30) & blk_in(38) & blk_in(46) & blk_in(54)  & blk_in(62) &

                                                          blk_in(4) & blk_in(12) & blk_in(20) & blk_in(28) & blk_in(36) & blk_in(44) & blk_in(52)  & blk_in(60) &

                                                          blk_in(2) & blk_in(10) & blk_in(18) & blk_in(26) & blk_in(34) & blk_in(42) & blk_in(50)  & blk_in(58) &

                                                          blk_in(0) & blk_in(8)  & blk_in(16) & blk_in(24) & blk_in(32) & blk_in(40) & blk_in(48)  & blk_in(56);

                        r_0_s <= blk_in(7) & blk_in(15) & blk_in(23) & blk_in(31) & blk_in(39) & blk_in(47) & blk_in(55)  & blk_in(63) &

                                                          blk_in(5) & blk_in(13) & blk_in(21) & blk_in(29) & blk_in(37) & blk_in(45) & blk_in(53)  & blk_in(61) &

                                                          blk_in(3) & blk_in(11) & blk_in(19) & blk_in(27) & blk_in(35) & blk_in(43) & blk_in(51)  & blk_in(59) &

                                                          blk_in(1) & blk_in(9)  & blk_in(17) & blk_in(25) & blk_in(33) & blk_in(41) & blk_in(49)  & blk_in(57);

                elsif rising_edge(clk) then

                        l_0_s <= l_1_s;

                        r_0_s <= r_1_s;

                end if;

        end process;

        DES_ROUND_0 :  des_round port map (clk, l_0_s, r_0_s, k_0_s, l_1_s, r_1_s);

        final_s <= r_1_s & l_1_s;

        blk_out  <=   final_s(24) & final_s(56) & final_s(16) & final_s(48) & final_s(8) & final_s(40) & final_s(0)  & final_s(32) &

                                          final_s(25) & final_s(57) & final_s(17) & final_s(49) & final_s(9) & final_s(41) & final_s(1) & final_s(33) &

                                          final_s(26) & final_s(58) & final_s(18) & final_s(50) & final_s(10) & final_s(42) & final_s(2) & final_s(34) &

                                          final_s(27) & final_s(59) & final_s(19) & final_s(51) & final_s(11) & final_s(43) & final_s(3) & final_s(35) &

                                          final_s(28) & final_s(60) & final_s(20) & final_s(52) & final_s(12) & final_s(44) & final_s(4)  & final_s(36) &

                                          final_s(29) & final_s(61) & final_s(21) & final_s(53) & final_s(13) & final_s(45) & final_s(5) & final_s(37) &

                                          final_s(30) & final_s(62) & final_s(22) & final_s(54) & final_s(14) & final_s(46) & final_s(6) & final_s(38) &

                                          final_s(31) & final_s(63) & final_s(23) & final_s(55) & final_s(15) & final_s(47) & final_s(7) & final_s(39);

        KEY_SCHEDULE_0 : key_schedule port map (clk, rst, mode, key_in, k_0_s);

end Behavioral;