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R10848/skinny-aead8/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;
reset_n: in std_logic;
boot: 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;
init: out std_logic;
swap_ctrl_k: out std_logic_vector(3 downto 0);
rc_nibble: out std_logic_vector(3 downto 0);
tick: out std_logic;
add_key: out std_logic;
lfsr_ctl2_en: out std_logic;
cycle: out std_logic_vector(9 downto 0)
);
end entity controller;
architecture comb of controller is
signal count: std_logic_vector(3 downto 0);
signal round: std_logic_vector(5 downto 0);
signal ctr: std_logic_vector(9 downto 0);
signal ctr_i: integer range 0 to 1023;
begin
count <= ctr(3 downto 0);
round <= ctr(9 downto 4);
ctr <= std_logic_vector(to_unsigned(ctr_i, 10));
cycle <= ctr;
process (Clk)
begin
if reset_n = '0' then
ctr_i <= 0;
elsif Clk'event and Clk ='1' then
--ctr_i <= (ctr_i + 1) mod 1024;
ctr_i <= (ctr_i + 1) mod 896;
if boot = '1' then
ctr_i <= 0;
end if;
end if;
end process;
process (round, count, rc)
variable round_i : integer range 0 to 55;
variable count_i : integer range 0 to 15;
begin
round_i := to_integer(unsigned(round));
count_i := to_integer(unsigned(count));
swap_ctrl <= "000";
load_mc <= '0';
init <= '0';
swap_ctrl_k <= "0000";
tick <= '0';
add_key <= '0';
rc_nibble <= "0000";
lfsr_ctl2_en <= '0';
if round_i = 0 then
init <= '1';
end if;
if count_i = 0 or count_i = 14 or count_i = 15 or count_i = 8 then
swap_ctrl(0) <= '1';
end if;
if count_i = 11 or count_i = 12 or count_i = 8 then
swap_ctrl(1) <= '1';
end if;
if count_i = 8 then
swap_ctrl(2) <= '1';
end if;
if count_i < 4 then
load_mc <= '1';
end if;
if count_i = 9 then
rc_nibble <= "0010";
tick <= '1';
elsif count_i = 5 then
rc_nibble <= "00" & rc(5 downto 4);
elsif count_i = 1 then
rc_nibble <= rc(3 downto 0);
end if;
if (count_i >= 9 or count_i < 1) then
swap_ctrl_k(0) <= '1';
end if;
if count_i = 15 then
swap_ctrl_k(1) <= '1';
end if;
if count_i = 14 or count_i = 15 or count_i = 0 then
swap_ctrl_k(2) <= '1';
end if;
if count_i = 15 or count_i = 0 or count_i = 3 then
swap_ctrl_k(3) <= '1';
end if;
if count_i >= 1 and count_i < 9 then
add_key <= '1';
end if;
if count_i < 8 then
lfsr_ctl2_en <= '1';
end if;
end process;
end architecture;
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