J'essaie de mettre en œuvre un pipeline MD5 en 3 étapes selon ce lien . En particulier les algorithmes de la page 31. Il existe également un autre document qui décrit le transfert de données. Cela se fait dans un FPGA (Terasic DE2-115). Il n'y a aucun schéma dans ce projet, seulement du code VHDL.
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
entity md5core is
port (
CLOCK_50 : in std_logic;
SW : in std_logic_vector(17 downto 17)
);
end entity md5core;
architecture md5core_rtl of md5core is
type r_array is array(0 to 64) of std_logic_vector(7 downto 0);
constant R : r_array := ( x"07", x"0c", x"11", x"16", x"07", x"0c", x"11", x"16", x"07", x"0c", x"11", x"16", x"07", x"0c", x"11",
x"16", x"05", x"09", x"0e", x"14", x"05", x"09", x"0e", x"14", x"05", x"09", x"0e", x"14", x"05", x"09",
x"0e", x"14", x"04", x"0b", x"10", x"17", x"04", x"0b", x"10", x"17", x"04", x"0b", x"10", x"17", x"04",
x"0b", x"10", x"17", x"06", x"0a", x"0f", x"15", x"06", x"0a", x"0f", x"15", x"06", x"0a", x"0f", x"15",
x"06", x"0a", x"0f", x"15", others => x"00");
type k_array is array(0 to 66) of std_logic_vector(31 downto 0);
constant K : k_array := (x"d76aa478", x"e8c7b756", x"242070db", x"c1bdceee",
x"f57c0faf", x"4787c62a", x"a8304613", x"fd469501",
x"698098d8", x"8b44f7af", x"ffff5bb1", x"895cd7be",
x"6b901122", x"fd987193", x"a679438e", x"49b40821",
x"f61e2562", x"c040b340", x"265e5a51", x"e9b6c7aa",
x"d62f105d", x"02441453", x"d8a1e681", x"e7d3fbc8",
x"21e1cde6", x"c33707d6", x"f4d50d87", x"455a14ed",
x"a9e3e905", x"fcefa3f8", x"676f02d9", x"8d2a4c8a",
x"fffa3942", x"8771f681", x"6d9d6122", x"fde5380c",
x"a4beea44", x"4bdecfa9", x"f6bb4b60", x"bebfbc70",
x"289b7ec6", x"eaa127fa", x"d4ef3085", x"04881d05",
x"d9d4d039", x"e6db99e5", x"1fa27cf8", x"c4ac5665",
x"f4292244", x"432aff97", x"ab9423a7", x"fc93a039",
x"655b59c3", x"8f0ccc92", x"ffeff47d", x"85845dd1",
x"6fa87e4f", x"fe2ce6e0", x"a3014314", x"4e0811a1",
x"f7537e82", x"bd3af235", x"2ad7d2bb", x"eb86d391", others => x"00000000");
type g_array is array(0 to 64) of integer range 0 to 15;
constant g_arr : g_array := (0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15,
1, 6, 11, 0, 5, 10, 15, 4, 9, 14, 3, 8, 13, 2, 7, 12,
5, 8, 11, 14, 1, 4, 7, 10, 13, 0, 3, 6, 9, 12, 15, 2,
0, 7, 14, 5, 12, 3, 10, 1, 8, 15, 6, 13, 4, 11, 2, 9, 0);
type w_array is array(0 to 15) of std_logic_vector(31 downto 0);
signal W : w_array;
constant AA : std_logic_vector(31 downto 0) := x"67452301";
constant BB : std_logic_vector(31 downto 0) := x"EFCDAB89";
constant CC : std_logic_vector(31 downto 0) := x"98BADCFE";
constant DD : std_logic_vector(31 downto 0) := x"10325476";
signal res_A : std_logic_vector(31 downto 0) := x"00000000";
signal res_B : std_logic_vector(31 downto 0) := x"00000000";
signal res_C : std_logic_vector(31 downto 0) := x"00000000";
signal res_D : std_logic_vector(31 downto 0) := x"00000000";
type in_str_t is array(0 to 5) of std_logic_vector(7 downto 0);
constant in_str : in_str_t := (x"68", x"65", x"6c", x"6c", x"6f", x"6f");
type pad_str_t is array(0 to 63) of std_logic_vector(7 downto 0);
signal pad_str : pad_str_t;
type state_t is (start, padding, init_w, state_1, state_2, state_3, state_4, done);
signal state : state_t;
signal a, b, c, d, f : std_logic_vector(31 downto 0) := x"00000000";
signal i : integer range 0 to 64 := 0;
signal g : integer range 0 to 15 := 0;
--signal tmp_b : std_logic_vector(31 downto 0);
signal akw : std_logic_vector(31 downto 0);
signal ak : std_logic_vector(31 downto 0);
signal b_tmp : std_logic_vector(31 downto 0);
begin
--tmp_b <= std_logic_vector(unsigned(b) + rotate_left(unsigned(a) + unsigned(f) + unsigned(K(i)) + unsigned(W(g)), to_integer(unsigned(R(i)))));
pipe_p : process(CLOCK_50, SW, a, b, c, d, i)
begin
if SW(17) = '0' then
-- ak <= std_logic_vector(unsigned(K(2)) + unsigned(BB));
-- akw <= std_logic_vector(unsigned(W(0)) + 1 + unsigned(K(2)) + unsigned(BB));
b_tmp <= BB;
elsif rising_edge(CLOCK_50) and state = state_1 then
if i = 0 then
ak <= std_logic_vector(unsigned(K(0)) + unsigned(a));
elsif i = 1 then
ak <= std_logic_vector(unsigned(K(1)) + unsigned(a));
akw <= std_logic_vector(unsigned(W(0)) + unsigned(ak));
elsif i = 2 then
ak <= std_logic_vector(unsigned(K(2)) + unsigned(a));
akw <= std_logic_vector(unsigned(W(1)) + unsigned(ak));
b_tmp <= std_logic_vector(unsigned(b) + (rotate_left(unsigned(akw) + unsigned(f), to_integer(unsigned(R(0))))));
else
ak <= std_logic_vector(unsigned(K(i)) + unsigned(a));
akw <= std_logic_vector(unsigned(W(g_arr(i-1))) + unsigned(ak));
b_tmp <= std_logic_vector(unsigned(b) + (rotate_left(unsigned(akw) + unsigned(f), to_integer(unsigned(R(i-2))))));
end if;
end if;
end process pipe_p;
md5_f_p : process(state, a, b, c, d, i)
begin
case state is
when state_1 =>
if i = 0 or i > 4 then
f <= (b and c) or ((not b) and d);
g <= g_arr(i);
end if;
when state_2 =>
f <= (d and b) or ((not d) and c);
g <= g_arr(i);
when state_3 =>
f <= b xor c xor d;
g <= g_arr(i);
when state_4 =>
f <= c xor (b or (not d));
g <= g_arr(i);
when others =>
f <= x"00000000";
g <= 0;
end case;
end process md5_f_p;
md5_p : process(CLOCK_50, SW, a, b, c, d, f, g)
begin
if SW(17) = '0' then
state <= start;
i <= 0;
a <= AA;
b <= BB;
c <= CC;
d <= DD;
W <= (others => x"00000000");
pad_str <= (others => x"00");
--tmp_b := BB;
elsif rising_edge(CLOCK_50) then
case state is
when start =>
pad_str(0) <= in_str(0);
pad_str(1) <= in_str(1);
pad_str(2) <= in_str(2);
pad_str(3) <= in_str(3);
pad_str(4) <= in_str(4);
pad_str(5) <= in_str(5);
state <= padding;
when padding =>
pad_str(6) <= "10000000";
pad_str(56) <= std_logic_vector(to_unsigned(in_str'length*8, 8));
state <= init_w;
when init_w =>
W(0) <= pad_str(3) & pad_str(2) & pad_str(1) & pad_str(0);
W(1) <= pad_str(7) & pad_str(6) & pad_str(5) & pad_str(4);
W(14) <= pad_str(59) & pad_str(58) & pad_str(57) & pad_str(56);
state <= state_1;
when state_1 =>
if i = 16 then
state <= state_2;
else
if i > 2 then
--tmp_b := b;
a <= d;
c <= b;
d <= c;
b <= b_tmp;
-- d <= c;
-- b <= b_tmp;
-- c <= b;
-- a <= d;
end if;
i <= i + 1;
end if;
when state_2 =>
if i = 32 then
state <= state_3;
else
d <= c;
b <= b_tmp;
c <= b;
a <= d;
i <= i + 1;
end if;
when state_3 =>
if i = 48 then
state <= state_4;
else
d <= c;
b <= b_tmp;
c <= b;
a <= d;
i <= i + 1;
end if;
when state_4 =>
if i = 64 then
res_A <= std_logic_vector(unsigned(AA) + unsigned(a));
res_B <= std_logic_vector(unsigned(BB) + unsigned(b));
res_C <= std_logic_vector(unsigned(CC) + unsigned(c));
res_D <= std_logic_vector(unsigned(DD) + unsigned(d));
state <= done;
else
d <= c;
c <= b;
b <= b_tmp;
a <= d;
i <= i + 1;
end if;
when done =>
state <= done;
when others =>
state <= done;
end case;
end if;
end process md5_p;
end architecture md5core_rtl;
En utilisant ce code, j'obtiens des valeurs correctes pour b
dans la première étape du tour 0, mais par la suite rien ne semble correspondre. Comme on le voit dans cette simulation, la première étape du tour 0 est correcte, mais par la suite non. C'est lors de l'utilisation a
dans cette expression:
ak <= std_logic_vector(unsigned(K(0)) + unsigned(a)); -- using a
Mais ... Si je comprends bien le deuxième document, je devrais utiliser à la c
place de a
(transfert de données), mais la première étape du tour 0 ne fonctionne pas non plus. C'est-à-dire que lorsque je fais cela, la première étape du tour 0 obtient également les mauvais numéros.
ak <= std_logic_vector(unsigned(K(0)) + unsigned(c)); -- changed to c
Pour la chaîne particulière dans le code ( helloo
), les valeurs suivantes sont correctes (3 premières étapes de la ronde 0).
i:0 => a:271733878, b:3679623978, c:4023233417, d:2562383102, f:2562383102, g:0
i:1 => a:2562383102, b:268703616, c:3679623978, d:4023233417, f:3421032412, g:1
i:2 => a:4023233417, b:566857930, c:268703616, d:3679623978, f:4291410697, g:2
Soit dit en passant, AKM
dans le document estakw
dans le code.
Tout conseil ou suggestion pour m'amener dans la bonne direction serait très apprécié. Le code serait idéal. Si quelque chose n'est pas clair, je vais modifier la question et essayer de rectifier cela.