-- ======================================================================
-- AES encryption/decryption testbench
-- tests according to NIST special publication
-- 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 std.env.all;

use work.aes_pkg.all;



entity tb_aes is
end entity tb_aes;



architecture rtl of tb_aes is


  signal s_reset         : std_logic := '0';
  signal s_clk           : std_logic := '0';
  signal s_mode          : std_logic := '0';
  signal s_key           : std_logic_vector(0 to 127) := (others => '0');
  signal s_datain        : std_logic_vector(0 to 127) := (others => '0');
  signal s_validin_enc   : std_logic := '0';
  signal s_acceptout_enc : std_logic;
  signal s_dataout_enc   : std_logic_vector(0 to 127);
  signal s_validout_enc  : std_logic;
  signal s_acceptin_enc  : std_logic := '0';
  signal s_validin_dec   : std_logic := '0';
  signal s_acceptout_dec : std_logic;
  signal s_dataout_dec   : std_logic_vector(0 to 127);
  signal s_validout_dec  : std_logic;
  signal s_acceptin_dec  : std_logic := '0';


begin


  s_clk   <= not(s_clk) after 10 ns;
  s_reset <= '1' after 100 ns;


  i_aes_enc : aes_enc
  port map (
    reset_i  => s_reset,
    clk_i    => s_clk,
    key_i    => s_key,
    data_i   => s_datain,
    valid_i  => s_validin_enc,
    accept_o => s_acceptout_enc,
    data_o   => s_dataout_enc,
    valid_o  => s_validout_enc,
    accept_i => s_acceptin_enc
  );


  i_aes_dec : aes_dec
  port map (
    reset_i  => s_reset,
    clk_i    => s_clk,
    key_i    => s_key,
    data_i   => s_datain,
    valid_i  => s_validin_dec,
    accept_o => s_acceptout_dec,
    data_o   => s_dataout_dec,
    valid_o  => s_validout_dec,
    accept_i => s_acceptin_dec
  );


  process is
  begin
    wait until s_reset = '1';
    -- ENCRYPTION TEST
    wait until rising_edge(s_clk);
    s_validin_enc <= '1';
    s_datain <= x"3243f6a8885a308d313198a2e0370734";
    wait until s_acceptout_enc = '1' and rising_edge(s_clk);
    s_validin_enc <= '0';
    wait until s_validout_enc = '1' and rising_edge(s_clk);
    s_acceptin_enc <= '1';
    assert s_dataout_enc = x"3925841D02DC09FBDC118597196A0B32"
      report "Encryption error"
      severity failure;
    s_datain <= s_dataout_enc;
    wait until rising_edge(s_clk);
    s_acceptin_enc <= '0';
    -- DECRYPTION TEST
    wait until rising_edge(s_clk);
    s_validin_dec <= '1';
    wait until s_acceptout_dec = '1' and rising_edge(s_clk);
    s_validin_dec <= '0';
    wait until s_validout_dec = '1' and rising_edge(s_clk);
    s_acceptin_dec <= '1';
    assert s_dataout_dec = x"3243f6a8885a308d313198a2e0370734"
      report "Decryption error"
      severity failure;
    wait until rising_edge(s_clk);
    s_acceptin_dec <= '0';
    wait for 100 ns;
    finish(0);
  end process;


end architecture rtl;