|
|
|
@ -21,8 +21,9 @@ |
|
|
|
|
|
|
|
library ieee; |
|
|
|
use ieee.std_logic_1164.all; |
|
|
|
use ieee.numeric_std.ALL; |
|
|
|
use work.des_pkg.ALL; |
|
|
|
use ieee.numeric_std.all; |
|
|
|
use work.des_pkg.all; |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
entity des is |
|
|
|
@ -349,8 +350,6 @@ begin |
|
|
|
|
|
|
|
AreaG : if design_type = "ITER" generate |
|
|
|
|
|
|
|
type t_mode is (NOP, CRYPT, DECRYPT); |
|
|
|
|
|
|
|
signal s_accept : std_logic; |
|
|
|
signal s_valid : std_logic; |
|
|
|
|
|
|
|
@ -361,13 +360,10 @@ begin |
|
|
|
|
|
|
|
|
|
|
|
cryptP : process (clk_i, reset_i) is |
|
|
|
-- variables for key calculation |
|
|
|
variable v_c : std_logic_vector(0 to 27); |
|
|
|
variable v_d : std_logic_vector(0 to 27); |
|
|
|
-- key variables |
|
|
|
variable v_key : std_logic_vector(0 to 47); |
|
|
|
-- variables for mode & valid shift registers |
|
|
|
variable v_mode : t_mode; |
|
|
|
variable v_c : std_logic_vector(0 to 27); |
|
|
|
variable v_d : std_logic_vector(0 to 27); |
|
|
|
variable v_key : std_logic_vector(0 to 47); |
|
|
|
variable v_mode : std_logic; |
|
|
|
variable v_rnd_cnt : natural; |
|
|
|
begin |
|
|
|
if(reset_i = '0') then |
|
|
|
@ -377,7 +373,7 @@ begin |
|
|
|
s_l <= (others => '0'); |
|
|
|
s_r <= (others => '0'); |
|
|
|
v_rnd_cnt := 0; |
|
|
|
v_mode := NOP; |
|
|
|
v_mode := '0'; |
|
|
|
s_accept <= '0'; |
|
|
|
s_valid <= '0'; |
|
|
|
elsif rising_edge(clk_i) then |
|
|
|
@ -394,17 +390,13 @@ begin |
|
|
|
s_r <= ip(data_i)(32 to 63); |
|
|
|
v_c := pc1_c(key_i); |
|
|
|
v_d := pc1_d(key_i); |
|
|
|
v_mode := mode_i; |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
if (mode_i = '0') then |
|
|
|
v_mode := CRYPT; |
|
|
|
else |
|
|
|
v_mode := DECRYPT; |
|
|
|
end if; |
|
|
|
end if; |
|
|
|
|
|
|
|
-- stage 1 |
|
|
|
when 1 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(1 to 27) & v_c(0); |
|
|
|
v_d := v_d(1 to 27) & v_d(0); |
|
|
|
end if; |
|
|
|
@ -414,7 +406,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 2 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(1 to 27) & v_c(0); |
|
|
|
v_d := v_d(1 to 27) & v_d(0); |
|
|
|
else |
|
|
|
@ -427,7 +419,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 3 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -440,7 +432,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 4 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -453,7 +445,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 5 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -466,7 +458,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 6 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -479,7 +471,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 7 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -492,7 +484,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 8 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -505,7 +497,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 9 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(1 to 27) & v_c(0); |
|
|
|
v_d := v_d(1 to 27) & v_d(0); |
|
|
|
else |
|
|
|
@ -518,7 +510,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 10 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -532,7 +524,7 @@ begin |
|
|
|
|
|
|
|
when 11 => |
|
|
|
-- 11. stage |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -545,7 +537,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 12 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -558,7 +550,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 13 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -571,7 +563,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 14 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -584,7 +576,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 15 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(2 to 27) & v_c(0 to 1); |
|
|
|
v_d := v_d(2 to 27) & v_d(0 to 1); |
|
|
|
else |
|
|
|
@ -597,7 +589,7 @@ begin |
|
|
|
v_rnd_cnt := v_rnd_cnt + 1; |
|
|
|
|
|
|
|
when 16 => |
|
|
|
if (v_mode = CRYPT) then |
|
|
|
if (v_mode = '0') then |
|
|
|
v_c := v_c(1 to 27) & v_c(0); |
|
|
|
v_d := v_d(1 to 27) & v_d(0); |
|
|
|
else |
|
|
|
|
