--== Header =============================================================================

library IEEE;
use IEEE.std_logic_1164.all;
use IEEE.numeric_std.all;

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--== Entidade ===========================================================================

ENTITY decryptor_tb IS
END decryptor_tb;

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--== Arquitetura ========================================================================

ARCHITECTURE behavior OF decryptor_tb IS
	-- Sinais Locais
	signal count : std_logic_vector(4 downto 0);

	signal byte_entrada : std_logic_vector(7 downto 0);
	signal          msg : std_logic_vector(7 downto 0);

	signal   clk : std_logic;
	signal reset : std_logic;

	-- Usando a definicao dos seguintes componentes
	COMPONENT decryptor IS
		PORT (
			byte_entrada : IN std_logic_vector(7 downto 0);
			         clk : IN std_logic;
			       reset : IN std_logic;
			         msg : OUT std_logic_vector(7 downto 0)
		);
	END component;


-- Comportamento
BEGIN
	decryptor1: decryptor PORT MAP ( byte_entrada, clk, reset );

	clk_gen: process
	begin
		clk <= '0';
		wait for 1 ns;
		clk <= '1';
		wait for 1 ns;
	end process;


	reset_gen: process
	begin
		reset <= '1';
		wait for 0.5 ns;
		reset <= '0';
		wait for 49.5 ns;
	end process;


	count_gen: process(clk, reset)
	begin
		if reset = '1' then
			count <= "00000";
		elsif rising_edge(clk) then
			count <= std_logic_vector( unsigned(count) + 1 );
		end if;
	end process;


	byte_entrada_gen: process(clk)
	begin
		if reset = '1' then
			byte_entrada <= std_logic_vector(to_unsigned(16#00#,8));
		elsif rising_edge(clk) then
			case count is
			
				-- Parte 1 - senha 64, msg_encriptada(32,2b,27,21,37,44,30,21,29,44)
				when "00000" => 
					byte_entrada <= std_logic_vector(to_unsigned(16#01#,8));
				when "00001" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#64#,8));
				when "00010" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#32#,8));
				when "00011" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#2b#,8));
				when "00100" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#27#,8));
				when "00101" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#21#,8));
				when "00110" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#37#,8));
				when "00111" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#44#,8));
				when "01000" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#30#,8));
				when "01001" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#21#,8));
				when "01010" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#29#,8));
				when "01011" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#44#,8));
				when "01100" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#00#,8));

				-- Parte 2 - senha 99, msg_encriptada(cf,d0,dd,d8,b9,db,d6,d8) 
				when "01101" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#01#,8));
				when "01110" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#99#,8));
				when "01111" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#cf#,8));
				when "10000" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#d0#,8));
				when "10001" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#dd#,8));
				when "10010" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#d8#,8));
				when "10011" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#b9#,8));
				when "10100" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#db#,8));
				when "10101" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#d6#,8));
				when "10110" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#d8#,8));
				when "10111" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#00#,8));

				-- Teste do estado 0 permanece no estado 0, se a entrada for aleatoria
				when "11000" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#aa#,8));
				when "11001" =>
					byte_entrada <= std_logic_vector(to_unsigned(16#23#,8));


				when others =>
					byte_entrada <= std_logic_vector(to_unsigned(16#00#,8));
			end case;
		end if;
	end process;
END;

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