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R10848/skinnyz2/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;
rc: in std_logic_vector(5 downto 0);
swap_ctrl: out std_logic_vector(2 downto 0);
load_mc: out std_logic;
load_sbox_st: out std_logic;
init: out std_logic;
swap_ctrl_k: out std_logic_vector(3 downto 0);
rc_bit: out std_logic;
tick: out std_logic;
add_key: out std_logic;
lfsr_ctl2: out std_logic_vector(1 downto 0);
rot: out std_logic
);
end entity controller;
architecture behav of controller is
signal count: std_logic_vector(6 downto 0);
signal round: std_logic_vector(5 downto 0);
signal ctr: std_logic_vector(12 downto 0);
signal ctr_i: integer range 0 to 8191;
begin
count <= ctr(6 downto 0);
round <= ctr(12 downto 7);
ctr <= std_logic_vector(to_unsigned(ctr_i, 13));
process (Rst, Clk)
begin
if Rst='0' then
ctr_i <= 0;
elsif Clk'event and Clk ='1' then
ctr_i <= (ctr_i + 1) mod 8192;
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, rc)
variable round_i : integer range 0 to 63;
variable count_i : integer range 0 to 127;
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';
swap_ctrl_k <= "0000";
tick <= '0';
add_key <= '0';
lfsr_ctl2 <= "00";
rc_bit <= '0';
rot <= '0';
if round_i = 0 then
init <= '1';
end if;
if count_i mod 8 = 0 then
load_sbox_st <= '1';
end if;
if (count_i >= 112 or count_i < 8) or
(count_i >= 64 and count_i < 72) then
swap_ctrl(0) <= '1';
end if;
if (count_i >= 88 and count_i < 104) or (count_i >= 64 and count_i < 72) then
swap_ctrl(1) <= '1';
end if;
if (count_i >= 64 and count_i < 72) then
swap_ctrl(2) <= '1';
end if;
if count_i < 32 then
load_mc <= '1';
end if;
if count_i = 78 then
rc_bit <= '1';
tick <= '1';
elsif count_i = 12 or count_i = 13 or count_i = 14 or count_i = 15 or count_i =46 or count_i = 47 then
rot <= '1';
rc_bit <= rc(3);
end if;
if (count_i >= 72 or count_i < 8) then
swap_ctrl_k(0) <= '1';
end if;
if count_i >= 120 then
swap_ctrl_k(1) <= '1';
end if;
if (count_i >= 112 or count_i < 8) then
swap_ctrl_k(2) <= '1';
end if;
if (count_i >= 120 or count_i < 8) or (count_i >= 24 and count_i <32) then
swap_ctrl_k(3) <= '1';
end if;
if count_i >= 8 and count_i < 72 then
add_key <= '1';
end if;
if count_i < 7 or
(count_i >= 8 and count_i < 15) or
(count_i >= 16 and count_i < 23) or
(count_i >= 24 and count_i < 31) or
(count_i >= 32 and count_i < 39) or
(count_i >= 40 and count_i < 47) or
(count_i >= 48 and count_i < 55) or
(count_i >= 56 and count_i < 63) then
lfsr_ctl2(1) <= '1';
end if;
if count_i = 0 or count_i = 8 or count_i = 16 or count_i = 24 or
count_i = 32 or count_i = 40 or count_i = 48 or count_i = 56 then
lfsr_ctl2(0) <= '1';
end if;
end process;
end architecture;
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