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----                                                               ----

---- Present - a lightweight block cipher project                  ----

----                                                               ----

---- This file is part of the Present - a lightweight block        ----

---- cipher project                                                ----

---- http://www.http://opencores.org/project,present               ----

----                                                               ----

---- Description:                                                  ----

----     Present decoder test bench. Test signals were taken from  ----

---- 'pure' Presnet encoder simulation (it is proper work, because ----

---- it was good implementation).                                  ----

---- To Do:                                                        ----

----                                                               ----

---- Author(s):                                                    ----

---- - Krzysztof Gajewski, gajos@opencores.org                     ----

----                       k.gajewski@gmail.com                    ----

----                                                               ----

-----------------------------------------------------------------------

----                                                               ----

---- Copyright (C) 2013 Authors and OPENCORES.ORG                  ----

----                                                               ----

---- This source file may be used and distributed without          ----

---- restriction provided that this copyright statement is not     ----

---- removed from the file and that any derivative work contains   ----

---- the original copyright notice and the associated disclaimer.  ----

----                                                               ----

---- This source file is free software; you can redistribute it    ----

---- and-or modify it under the terms of the GNU Lesser General    ----

---- Public License as published by the Free Software Foundation;  ----

---- either version 2.1 of the License, or (at your option) any    ----

---- later version.                                                ----

----                                                               ----

---- This source 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 Lesser General Public License for more   ----

---- details.                                                      ----

----                                                               ----

---- You should have received a copy of the GNU Lesser General     ----

---- Public License along with this source; if not, download it    ----

---- from http://www.opencores.org/lgpl.shtml                      ----

----                                                               ----

-----------------------------------------------------------------------

LIBRARY ieee;

USE ieee.std_logic_1164.ALL;

-- Uncomment the following library declaration if using

-- arithmetic functions with Signed or Unsigned values

--USE ieee.numeric_std.ALL;

ENTITY PresentDecTB IS

END PresentDecTB;

ARCHITECTURE behavior OF PresentDecTB IS

    -- Component Declaration for the Unit Under Test (UUT)

    COMPONENT PresentDec

    PORT(

         plaintext : IN  std_logic_vector(63 downto 0);

         key : IN  std_logic_vector(79 downto 0);

         ciphertext : OUT  std_logic_vector(63 downto 0);

         start : IN  std_logic;

         clk : IN  std_logic;

         reset : IN  std_logic;

         ready : OUT  std_logic

        );

    END COMPONENT;

   --Inputs

   signal plaintext : std_logic_vector(63 downto 0) := (others => '0');

   signal key : std_logic_vector(79 downto 0) := (others => '0');

   signal start : std_logic := '0';

   signal clk : std_logic := '0';

   signal reset : std_logic := '0';

        --Outputs

   signal ciphertext : std_logic_vector(63 downto 0);

   signal ready : std_logic;

   -- Clock period definitions

   constant clk_period : time := 10 ns;

BEGIN

        -- Instantiate the Unit Under Test (UUT)

   uut: PresentDec PORT MAP (

          plaintext => plaintext,

          key => key,

          ciphertext => ciphertext,

          start => start,

          clk => clk,

          reset => reset,

          ready => ready

        );

   -- Clock process definitions

   clk_process :process

   begin

                clk <= '0';

                wait for clk_period/2;

                clk <= '1';

                wait for clk_period/2;

   end process;

   -- Stimulus process

   stim_proc: process

   begin

---- Preparation for test case 1 -----------------

--   plaintext <= x"5579c1387b228445";

--   key <= x"6dab31744f41d7008759";

--   expected_ciphertext <= x"0000000000000000";

--------------------------------------------------

                reset <= '1';

      start <= '0';

                plaintext <= x"5579c1387b228445";

                key <= x"6dab31744f41d7008759";

                wait for 100 ns;

                reset <= '0';

                plaintext <= x"5579c1387b228445";

                key <= x"6dab31744f41d7008759";

                start <= '1';

                wait until ready = '1';

                if ciphertext /= x"0000000000000000" then

                        report "RESULT MISMATCH! Test case 1 failed" severity ERROR;

                        assert false severity failure;

                else

                        report "Test case 1 successful" severity note;

                end if;

---- Preparation for test case 2 -----------------

--   plaintext <= x"e72c46c0f5945049";

--   key <= x"fe7a548fb60eb167c511";

--   expected_ciphertext <= x"0000000000000000";

--------------------------------------------------

                start <= '0';

                wait for clk_period;

                plaintext <= x"e72c46c0f5945049";

                key <= x"fe7a548fb60eb167c511";

                start <= '1';

                wait until ready = '1';

                if ciphertext /= x"0000000000000000" then

                        report "RESULT MISMATCH! Test case 2 failed" severity ERROR;

                        assert false severity failure;

                else

                        report "Test case 2 successful" severity note;

                end if;

---- Preparation for test case 3 -----------------

--   plaintext <= x"a112ffc72f68417b";

--   key <= x"6dab31744f41d7008759";

--   expected_ciphertext <= x"ffffffffffffffff";

--------------------------------------------------

                start <= '0';

                wait for clk_period;

                plaintext <= x"a112ffc72f68417b";

                key <= x"6dab31744f41d7008759";

                start <= '1';

      wait until ready = '1';

                if ciphertext /= x"ffffffffffffffff" then

                        report "RESULT MISMATCH! Test case 3 failed" severity ERROR;

                        assert false severity failure;

                else

                        report "Test case 3 successful" severity note;

                end if;

---- Preparation for test case 4 -----------------

--   plaintext <= x"3333dcd3213210d2";

--   key <= x"fe7a548fb60eb167c511";

--   expected_ciphertext <= x"ffffffffffffffff";

--------------------------------------------------

                start <= '0';

                wait for clk_period;

                plaintext <= x"3333dcd3213210d2";

                key <= x"fe7a548fb60eb167c511";

                start <= '1';

                wait until ready = '1';

                if ciphertext /= x"ffffffffffffffff" then

                        report "RESULT MISMATCH! Test case 4 failed" severity ERROR;

                        assert false severity failure;

                else

                        report "Test case 4 successful" severity note;

                end if;

                assert false severity failure;

   end process;

END;