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library ieee;

use ieee.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

entity key is

  port (

  st : in  bit_vector ( 7 downto 0);

  Nk : in  bit_vector ( 3 downto 0);

  key: out bit_vector (31 downto 0)  -- 32 bit key output

  );

end key;

architecture phy of key is

signal keya : bit_vector (31 downto 0);

signal keyb : bit_vector (31 downto 0);

signal keyc : bit_vector (31 downto 0);

begin

  with Nk(3 downto 0) select

  key <=

  keya        when X"4",

  keyb        when X"6",

  keyc        when X"8",

  X"00000000" when others;

  with st(7 downto 0) select

  keya <=

  X"2b7e1516" when X"00", -- 0

  X"28aed2a6" when X"01", -- 1

  X"abf71588" when X"02", -- 2

  X"09cf4f3c" when X"03", -- 3

  X"a0fafe17" when X"04", -- 4

  X"88542cb1" when X"05", -- 5

  X"23a33939" when X"06", -- 6

  X"2a6c7605" when X"07", -- 7

  X"f2c295f2" when X"08", -- 8

  X"7a96b943" when X"09", -- 9

  X"5935807a" when X"0a", -- 0

  X"7359f67f" when X"0b", -- 1

  X"3d80477d" when X"0c", -- 2

  X"4716fe3e" when X"0d", -- 3

  X"1e237e44" when X"0e", -- 4

  X"6d7a883b" when X"0f", -- 5

  X"ef44a541" when X"10", -- 6

  X"a8525b7f" when X"11", -- 7

  X"b671253b" when X"12", -- 8

  X"db0bad00" when X"13", -- 9

  X"d4d1c6f8" when X"14", -- 0

  X"7c839d87" when X"15", -- 1

  X"caf2b8bc" when X"16", -- 2

  X"11f915bc" when X"17", -- 3

  X"6d88a37a" when X"18", -- 4

  X"110b3efd" when X"19", -- 5

  X"dbf98641" when X"1a", -- 6

  X"ca0093fd" when X"1b", -- 7

  X"4e54f70e" when X"1c", -- 8

  X"5f5fc9f3" when X"1d", -- 9

  X"84a64fb2" when X"1e", -- 0

  X"4ea6dc4f" when X"1f", -- 1

  X"ead27321" when X"20", -- 2

  X"b58dbad2" when X"21", -- 3

  X"312bf560" when X"22", -- 4

  X"7f8d292f" when X"23", -- 5

  X"ac7766f3" when X"24", -- 6

  X"19fadc21" when X"25", -- 7

  X"28d12941" when X"26", -- 8

  X"575c006e" when X"27", -- 9

  X"d014f9a8" when X"28", -- 0

  X"c9ee2589" when X"29", -- 1

  X"e13f0cc8" when X"2a", -- 2

  X"b6630ca6" when X"2b", -- 3

  X"00000000" when others;

  with st(7 downto 0) select

  keyb <=

  X"8e73b0f7" when X"00",

  X"da0e6452" when X"01",

  X"c810f32b" when X"02",

  X"809079e5" when X"03",

  X"62f8ead2" when X"04",

  X"522c6b7b" when X"05",

  X"fe0c91f7" when X"06",

  X"2402f5a5" when X"07",

  X"ec12068e" when X"08",

  X"6c827f6b" when X"09",

  X"0e7a95b9" when X"0a",

  X"5c56fec2" when X"0b",

  X"4db7b4bd" when X"0c",

  X"69b54118" when X"0d",

  X"85a74796" when X"0e",

  X"e92538fd" when X"0f",

  X"e75fad44" when X"10",

  X"bb095386" when X"11",

  X"485af057" when X"12",

  X"21efb14f" when X"13",

  X"a448f6d9" when X"14",

  X"4d6dce24" when X"15",

  X"aa326360" when X"16",

  X"113b30e6" when X"17",

  X"a25e7ed5" when X"18",

  X"83b1cf9a" when X"19",

  X"27f93943" when X"1a",

  X"6a94f767" when X"1b",

  X"c0a69407" when X"1c",

  X"d19da4e1" when X"1d",

  X"ec1786eb" when X"1e",

  X"6fa64971" when X"1f",

  X"485f7032" when X"20",

  X"22cb8755" when X"21",

  X"e26d1352" when X"22",

  X"33f0b7b3" when X"23",

  X"40beeb28" when X"24",

  X"2f18a259" when X"25",

  X"6747d26b" when X"26",

  X"458c553e" when X"27",

  X"a7e1466c" when X"28",

  X"9411f1df" when X"29",

  X"821f750a" when X"2a",

  X"ad07d753" when X"2b",

  X"ca400538" when X"2c",

  X"8fcc5006" when X"2d",

  X"282d166a" when X"2e",

  X"bc3ce7b5" when X"2f",

  X"e98ba06f" when X"30",

  X"448c773c" when X"31",

  X"8ecc7204" when X"32",

  X"01002202" when X"33",

  X"00000000" when others;

  with st(7 downto 0) select

  keyc <=

  X"603deb10" when X"00",

  X"15ca71be" when X"01",

  X"2b73aef0" when X"02",

  X"857d7781" when X"03",

  X"1f352c07" when X"04",

  X"3b6108d7" when X"05",

  X"2d9810a3" when X"06",

  X"0914dff4" when X"07",

  X"9ba35411" when X"08",

  X"8e6925af" when X"09",

  X"a51a8b5f" when X"0a",

  X"2067fcde" when X"0b",

  X"a8b09c1a" when X"0c",

  X"93d194cd" when X"0d",

  X"be49846e" when X"0e",

  X"b75d5b9a" when X"0f",

  X"d59aecb8" when X"10",

  X"5bf3c917" when X"11",

  X"fee94248" when X"12",

  X"de8ebe96" when X"13",

  X"b5a9328a" when X"14",

  X"2678a647" when X"15",

  X"98312229" when X"16",

  X"2f6c79b3" when X"17",

  X"812c81ad" when X"18",

  X"dadf48ba" when X"19",

  X"24360af2" when X"1a",

  X"fab8b464" when X"1b",

  X"98c5bfc9" when X"1c",

  X"bebd198e" when X"1d",

  X"268c3ba7" when X"1e",

  X"09e04214" when X"1f",

  X"68007bac" when X"20",

  X"b2df3316" when X"21",

  X"96e939e4" when X"22",

  X"6c518d80" when X"23",

  X"c814e204" when X"24",

  X"76a9fb8a" when X"25",

  X"5025c02d" when X"26",

  X"59c58239" when X"27",

  X"de136967" when X"28",

  X"6ccc5a71" when X"29",

  X"fa256395" when X"2a",

  X"9674ee15" when X"2b",

  X"5886ca5d" when X"2c",

  X"2e2f31d7" when X"2d",

  X"7e0af1fa" when X"2e",

  X"27cf73c3" when X"2f",

  X"749c47ab" when X"30",

  X"18501dda" when X"31",

  X"e2757e4f" when X"32",

  X"7401905a" when X"33",

  X"cafaaae3" when X"34",

  X"e4d59b34" when X"35",

  X"9adf6ace" when X"36",

  X"bd10190d" when X"37",

  X"fe4890d1" when X"38",

  X"e6188d0b" when X"39",

  X"046df344" when X"3a",

  X"706c631e" when X"3b",

  X"00000000" when others;

end phy;