cryptography ip-cores in vhdl / verilog
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-- ======================================================================
-- TDES encryption/decryption
-- algorithm according to FIPS 46-3 specification
-- Copyright (C) 2011 Torsten Meissner
-------------------------------------------------------------------------
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; either version 2 of the License, or
-- (at your option) any later version.
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-- ======================================================================
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
use work.des_pkg.all;
entity tdes is
port (
reset_i : in std_logic; -- async reset
clk_i : in std_logic; -- clock
mode_i : in std_logic; -- tdes-modus: 0 = encrypt, 1 = decrypt
key1_i : in std_logic_vector(0 TO 63); -- key input
key2_i : in std_logic_vector(0 TO 63); -- key input
key3_i : in std_logic_vector(0 TO 63); -- key input
data_i : in std_logic_vector(0 TO 63); -- data input
valid_i : in std_logic; -- input key/data valid flag
data_o : out std_logic_vector(0 TO 63); -- data output
valid_o : out std_logic; -- output data valid flag
ready_o : out std_logic
);
end entity tdes;
architecture rtl of tdes is
component des is
port (
reset_i : in std_logic;
clk_i : IN std_logic; -- clock
mode_i : IN std_logic; -- des-modus: 0 = encrypt, 1 = decrypt
key_i : IN std_logic_vector(0 TO 63); -- key input
data_i : IN std_logic_vector(0 TO 63); -- data input
valid_i : IN std_logic; -- input key/data valid flag
data_o : OUT std_logic_vector(0 TO 63); -- data output
valid_o : OUT std_logic -- output data valid flag
);
end component des;
signal s_ready : std_logic;
signal s_reset : std_logic;
signal s_mode : std_logic;
signal s_des2_mode : std_logic;
signal s_des1_validin : std_logic := '0';
signal s_des1_validout : std_logic;
signal s_des2_validout : std_logic;
signal s_des3_validout : std_logic;
signal s_key1 : std_logic_vector(0 to 63);
signal s_key2 : std_logic_vector(0 to 63);
signal s_key3 : std_logic_vector(0 to 63);
signal s_des1_key : std_logic_vector(0 to 63);
signal s_des3_key : std_logic_vector(0 to 63);
signal s_des1_dataout : std_logic_vector(0 to 63);
signal s_des2_dataout : std_logic_vector(0 to 63);
begin
ready_o <= s_ready;
valid_o <= s_des3_validout;
s_des2_mode <= not(s_mode);
s_des1_validin <= valid_i and s_ready;
s_des1_key <= key1_i when mode_i = '0' else key3_i;
s_des3_key <= s_key3 when s_mode = '0' else s_key1;
inputregister : process(clk_i, reset_i) is
begin
if(reset_i = '0') then
s_reset <= '0';
s_mode <= '0';
s_key1 <= (others => '0');
s_key2 <= (others => '0');
s_key3 <= (others => '0');
elsif(rising_edge(clk_i)) then
s_reset <= reset_i;
if(valid_i = '1' and s_ready = '1') then
s_mode <= mode_i;
s_key1 <= key1_i;
s_key2 <= key2_i;
s_key3 <= key3_i;
end if;
end if;
end process inputregister;
outputregister : process(clk_i, reset_i) is
begin
if(reset_i = '0') then
s_ready <= '0';
elsif(rising_edge(clk_i)) then
if(valid_i = '1' and s_ready = '1') then
s_ready <= '0';
end if;
if(s_des3_validout = '1' or (reset_i = '1' and s_reset = '0')) then
s_ready <= '1';
end if;
end if;
end process outputregister;
i1_des : des
port map (
reset_i => reset_i,
clk_i => clk_i,
mode_i => mode_i,
key_i => s_des1_key,
data_i => data_i,
valid_i => s_des1_validin,
data_o => s_des1_dataout,
valid_o => s_des1_validout
);
i2_des : des
port map (
reset_i => reset_i,
clk_i => clk_i,
mode_i => s_des2_mode,
key_i => s_key2,
data_i => s_des1_dataout,
valid_i => s_des1_validout,
data_o => s_des2_dataout,
valid_o => s_des2_validout
);
i3_des : des
port map (
reset_i => reset_i,
clk_i => clk_i,
mode_i => s_mode,
key_i => s_des3_key,
data_i => s_des2_dataout,
valid_i => s_des2_validout,
data_o => data_o,
valid_o => s_des3_validout
);
end architecture rtl;