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135 lines
4.1 KiB
135 lines
4.1 KiB
-- ======================================================================
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-- TDES encryption/decryption
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-- algorithm according to FIPS 46-3 specification
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-- Copyright (C) 2011 Torsten Meissner
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-------------------------------------------------------------------------
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2 of the License, or
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-- (at your option) any later version.
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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-- ======================================================================
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.numeric_std.all;
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use work.des_pkg.all;
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entity tdes is
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port (
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reset_i : in std_logic; -- async reset
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clk_i : in std_logic; -- clock
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mode_i : in std_logic; -- tdes-modus: 0 = encrypt, 1 = decrypt
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key1_i : in std_logic_vector(0 to 63); -- key input
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key2_i : in std_logic_vector(0 to 63); -- key input
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key3_i : in std_logic_vector(0 to 63); -- key input
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data_i : in std_logic_vector(0 to 63); -- data input
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valid_i : in std_logic; -- input key/data valid flag
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accept_o : out std_logic;
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data_o : out std_logic_vector(0 to 63); -- data output
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valid_o : out std_logic; -- output data valid flag
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accept_i : in std_logic
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);
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end entity tdes;
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architecture rtl of tdes is
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signal s_mode : std_logic;
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signal s_des1_validout : std_logic;
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signal s_des2_validout : std_logic;
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signal s_des2_acceptout : std_logic;
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signal s_des3_acceptout : std_logic;
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signal s_key1 : std_logic_vector(0 to 63);
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signal s_key2 : std_logic_vector(0 to 63);
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signal s_key3 : std_logic_vector(0 to 63);
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signal s_des1_key : std_logic_vector(0 to 63);
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signal s_des3_key : std_logic_vector(0 to 63);
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signal s_des1_dataout : std_logic_vector(0 to 63);
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signal s_des2_dataout : std_logic_vector(0 to 63);
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begin
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s_des1_key <= key1_i when mode_i = '0' else key3_i;
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s_des3_key <= s_key3 when s_mode = '0' else s_key1;
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inputregister : process (clk_i, reset_i) is
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begin
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if (reset_i = '0') then
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s_mode <= '0';
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s_key1 <= (others => '0');
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s_key2 <= (others => '0');
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s_key3 <= (others => '0');
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elsif(rising_edge(clk_i)) then
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if (valid_i = '1' and accept_o = '1') then
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s_mode <= mode_i;
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s_key1 <= key1_i;
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s_key2 <= key2_i;
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s_key3 <= key3_i;
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end if;
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end if;
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end process inputregister;
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i1_des : des
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port map (
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reset_i => reset_i,
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clk_i => clk_i,
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mode_i => mode_i,
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key_i => s_des1_key,
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data_i => data_i,
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valid_i => valid_i,
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accept_o => accept_o,
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data_o => s_des1_dataout,
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valid_o => s_des1_validout,
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accept_i => s_des2_acceptout
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);
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i2_des : des
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port map (
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reset_i => reset_i,
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clk_i => clk_i,
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mode_i => not s_mode,
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key_i => s_key2,
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data_i => s_des1_dataout,
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valid_i => s_des1_validout,
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accept_o => s_des2_acceptout,
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data_o => s_des2_dataout,
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valid_o => s_des2_validout,
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accept_i => s_des3_acceptout
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);
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i3_des : des
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port map (
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reset_i => reset_i,
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clk_i => clk_i,
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mode_i => s_mode,
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key_i => s_des3_key,
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data_i => s_des2_dataout,
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valid_i => s_des2_validout,
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accept_o => s_des3_acceptout,
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data_o => data_o,
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valid_o => valid_o,
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accept_i => accept_i
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);
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end architecture rtl;
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