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R10848/aes8/src/controller.vhd
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controller.vhd
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library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use std.textio.all;
use work.all;
entity controller is
port ( Clk: in std_logic;
Rst: in std_logic;
swap_ctrl: out std_logic_vector(2 downto 0);
load_mc: out std_logic;
load_sbox_st: out std_logic;
load_sbox_key: out std_logic;
init: out std_logic;
add_rc: out std_logic;
swap_ctrl_k: out std_logic_vector(1 downto 0);
kxor: out std_logic;
mcx1: out std_logic;
rcout: out std_logic_vector(7 downto 0)
);
end entity controller;
architecture behav of controller is
signal count: std_logic_vector(3 downto 0);
signal round: std_logic_vector(3 downto 0);
signal ctr: std_logic_vector(7 downto 0);
signal ctr_i: integer range 0 to 255;
subtype Rctype is std_logic_vector(7 downto 0);
type RconType is array (0 to 10) of Rctype;
constant Rcon : RconType := (x"01",x"02",x"04",x"08",x"10",x"20",x"40",x"80",x"1b",x"36",x"6c");
begin
count <= ctr(3 downto 0);
round <= ctr(7 downto 4);
ctr <= std_logic_vector(to_unsigned(ctr_i, 8));
process (Rst, Clk)
begin
if Rst='0' then
ctr_i <= 0;
elsif Clk'event and Clk ='1' then
ctr_i <= (ctr_i + 1) mod 256;
end if;
end process;
--sbox_sel <= '1' when count(2 downto 0) = "000" else '0';
-- control logic for MixColumn
--notLSB <= '0' when ctr(2 downto 0) = "111" else '1';
--Poly <= '0' when (ctr(2 downto 1) = "00" or ctr(2 downto 0) = "010" or ctr(2 downto 0) = "101") else '1';
--mctrigger <= '1' when ctr(2 downto 0) = "000" else '0';
process (round, count)
variable round_i : integer range 0 to 15;
variable count_i : integer range 0 to 15;
begin
round_i := to_integer(unsigned(round));
count_i := to_integer(unsigned(count));
load_sbox_st <= '0';
swap_ctrl <= "000";
load_mc <= '0';
init <= '0';
load_sbox_key <= '0';
add_rc <= '0';
swap_ctrl_k <= "00";
kxor <= '0';
mcx1<='0';
if (count_i = 7) or
(count_i = 11) or
(count_i = 15) or
(count_i = 1) then
swap_ctrl(0) <= '1';
end if;
if (count_i = 11) or
(count_i = 15) or
count_i = 0 then
swap_ctrl(1) <= '1';
end if;
if (count_i = 0) then
swap_ctrl(2) <= '1';
end if;
if round_i < 10 and (count_i mod 4 = 0) then
load_mc <= '1';
end if;
if round_i < 10 and (count_i=0) then
mcx1 <= '1';
end if;
if round_i = 0 then
init <= '1';
end if;
if count_i=14 then
add_rc<='1';
end if;
if count_i =0 then
swap_ctrl_k(0) <= '1';
end if;
if count_i =7 then
swap_ctrl_k(1) <= '1';
end if;
if count_i = 14 or count_i = 15 or count_i = 0 or count_i = 1 then
load_sbox_key <= '1';
end if;
-- keep a look-up table for the round constant bits
rcout<= Rcon(round_i);
if count_i < 12 then
kxor <= '1';
end if;
end process;
end architecture;
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