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Diffusion Energy Analysis of Lightweight AEAD Circuit (master) Browse

R10499/locus/round/src/controller.vhd
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controller.vhd
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library ieee;
use ieee.std_logic_1164.all;
entity controller is
port (clk : in std_logic;
reset : in std_logic;
core_done : in std_logic;
last_block : in std_logic;
last_partial : in std_logic;
empty_ad : in std_logic;
empty_msg : in std_logic;
mode : out std_logic_vector(2 downto 0);
tweak : out std_logic_vector(3 downto 0);
core_reset : out std_logic;
nonce_delta_en : out std_logic;
v_delta_en : out std_logic;
w_delta_en : out std_logic;
l_delta_en : out std_logic;
l_delta_load : out std_logic;
load_key : out std_logic;
load_key_delta : out std_logic);
end;
architecture behaviour of controller is
type state_type is (start, init_0a, init_0, init_1a, init_1,
ad_0, ad, enc_0a, enc_0, enc_1a, enc_1, tag_0, tag);
signal state, next_state : state_type;
begin
state_reg : process(clk, reset)
begin
if reset = '0' then
state <= start;
elsif rising_edge(clk) then
state <= next_state;
end if;
end process;
fsm : process(state, core_done, empty_ad, empty_msg, last_block, last_partial)
begin
next_state <= state;
mode <= "000";
tweak <= "0000";
core_reset <= '0';
nonce_delta_en <= '1';
v_delta_en <= '1';
w_delta_en <= '1';
l_delta_en <= '1';
l_delta_load <= '0';
load_key <= '0';
load_key_delta <= '0';
case state is
when start =>
next_state <= init_0a;
when init_0a =>
mode <= "000";
tweak <= "0000";
load_key <= '1';
l_delta_en <= '0';
l_delta_load <= '1';
core_reset <= '1';
next_state <= init_0;
when init_0 =>
next_state <= init_0;
mode <= "000";
tweak <= "0000";
if core_done = '1' then
next_state <= init_1a;
end if;
when init_1a =>
next_state <= init_1;
mode <= "001";
tweak <= "0001";
load_key_delta <= '1';
core_reset <= '1';
when init_1 =>
next_state <= init_1;
mode <= "001";
tweak <= "0001";
load_key_delta <= '1';
if core_done = '1' then
nonce_delta_en <= '0';
if empty_ad = '1' and empty_msg = '1' then
next_state <= tag_0;
elsif empty_ad = '1' then
next_state <= enc_0a;
else
next_state <= ad_0;
end if;
end if;
when ad_0 =>
next_state <= ad;
mode <= "010";
core_reset <= '1';
if last_partial = '1' then
tweak <= "0011";
else
tweak <= "0010";
end if;
when ad =>
next_state <= ad;
mode <= "010";
if last_partial = '1' then
tweak <= "0011";
else
tweak <= "0010";
end if;
if core_done = '1' then
v_delta_en <= '0';
l_delta_en <= '0';
if last_block = '1' then
if empty_msg = '1' then
next_state <= tag_0;
else
next_state <= enc_0a;
end if;
else
next_state <= ad_0;
end if;
end if;
when enc_0a =>
next_state <= enc_0;
core_reset <= '1';
if last_block = '1' then
mode <= "101";
tweak <= "0101";
else
mode <= "010";
tweak <= "0100";
end if;
when enc_0 =>
next_state <= enc_0;
if last_block = '1' then
mode <= "101";
tweak <= "0101";
else
mode <= "010";
tweak <= "0100";
end if;
if core_done = '1' then
w_delta_en <= '0';
next_state <= enc_1a;
end if;
when enc_1a =>
next_state <= enc_1;
mode <= "001";
core_reset <= '1';
if last_block = '1' then
tweak <= "0101";
else
tweak <= "0100";
end if;
when enc_1 =>
next_state <= enc_1;
mode <= "001";
if last_block = '1' then
tweak <= "0101";
else
tweak <= "0100";
end if;
if core_done = '1' then
l_delta_en <= '0';
--w_delta_en <= '0';
if last_block = '1' then
next_state <= tag_0;
else
next_state <= enc_0a;
end if;
end if;
when tag_0 =>
next_state <= tag;
mode <= "100";
tweak <= "0110";
core_reset <= '1';
when tag =>
next_state <= tag;
mode <= "100";
tweak <= "0110";
end case;
end process;
end behaviour;
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