-- This work is licensed under a Creative Commons
-- Attribution-NonCommercial-ShareAlike 4.0 International License.
-- http://creativecommons.org/licenses/by-nc-sa/4.0

-- Mark D. Aagaard
-- Riham AlTawy
-- Guang Gong
-- Kalikinkar Mandal
-- Raghvendra Rohit
-- Marat Sattarov
-- Nusa Zidaric
-- http://uwaterloo.ca/communications-security-lab/lwc/wage


-- This is a human-readable summary of (and not a substitute for) the license. 
-- You are free to:

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--     the license terms.

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--     No additional restrictions — You may not apply legal terms or
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--     anything the license permits.

------------------------------------------
--- sbox SB for WAGE
------------------------------------------

library ieee;
use ieee.std_logic_1164.all;

entity sb is 
  port
    ( i_a : in  std_logic_vector(0 to 6)
    ; o_z : out std_logic_vector(0 to 6)
   ); 
end sb; 

architecture rtl of sb is 
  type connections is array (0 to 7) of std_logic_vector (0 to 6);
  signal steps: connections;
begin

  steps(0) <= i_a;
  
  seven_steps: for i in 0 to 4 generate
    oneR: entity work.r_sb port map ( steps(i), steps(i+1) );
  end generate;

  oneQ: entity work.q_sb port map ( steps(5), steps(6) );

  one_not: entity work.not_sb port map ( steps(6), steps(7));
  
  o_z <= steps(7);
  
end;