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arif_endro |
-- ------------------------------------------------------------------------
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-- Copyright (C) 2010 Arif Endro Nugroho
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-- All rights reserved.
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--
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-- Redistribution and use in source and binary forms, with or without
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-- modification, are permitted provided that the following conditions
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-- are met:
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--
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-- 1. Redistributions of source code must retain the above copyright
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-- notice, this list of conditions and the following disclaimer.
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-- 2. Redistributions in binary form must reproduce the above copyright
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-- notice, this list of conditions and the following disclaimer in the
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-- documentation and/or other materials provided with the distribution.
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--
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-- THIS SOFTWARE IS PROVIDED BY ARIF ENDRO NUGROHO "AS IS" AND ANY EXPRESS
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-- OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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-- WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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-- DISCLAIMED. IN NO EVENT SHALL ARIF ENDRO NUGROHO BE LIABLE FOR ANY
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-- DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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-- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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-- OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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-- HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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-- STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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-- ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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-- POSSIBILITY OF SUCH DAMAGE.
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--
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-- End Of License.
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-- ------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_unsigned.all;
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entity keyschedule is
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port (
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key : in bit_vector ( 63 downto 0);
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st : in bit_vector ( 3 downto 0);
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ldk : in bit;
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--probe
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--keyreg1_prb : out bit_vector (127 downto 0);
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--keyreg2_prb : out bit_vector (127 downto 0);
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--probe
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rk : out bit_vector ( 15 downto 0);
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clk : in bit;
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rst : in bit
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);
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end keyschedule;
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architecture phy of keyschedule is
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signal keyreg1 : bit_vector (127 downto 0);
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signal keyreg2 : bit_vector (127 downto 0);
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signal k1 : bit_vector ( 15 downto 0);
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signal k2 : bit_vector ( 15 downto 0);
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signal k3 : bit_vector ( 15 downto 0);
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signal k4 : bit_vector ( 15 downto 0);
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signal k5 : bit_vector ( 15 downto 0);
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signal k6 : bit_vector ( 15 downto 0);
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signal k7 : bit_vector ( 15 downto 0);
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signal k8 : bit_vector ( 15 downto 0);
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signal c1 : bit_vector ( 15 downto 0);
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signal c2 : bit_vector ( 15 downto 0);
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signal c3 : bit_vector ( 15 downto 0);
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signal c4 : bit_vector ( 15 downto 0);
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signal c5 : bit_vector ( 15 downto 0);
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signal c6 : bit_vector ( 15 downto 0);
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signal c7 : bit_vector ( 15 downto 0);
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signal c8 : bit_vector ( 15 downto 0);
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--constant c1 : bit_vector ( 15 downto 0) := X"0123";
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--constant c2 : bit_vector ( 15 downto 0) := X"4567";
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--constant c3 : bit_vector ( 15 downto 0) := X"89ab";
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--constant c4 : bit_vector ( 15 downto 0) := X"cdef";
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--constant c5 : bit_vector ( 15 downto 0) := X"fedc";
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--constant c6 : bit_vector ( 15 downto 0) := X"ba98";
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--constant c7 : bit_vector ( 15 downto 0) := X"7654";
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--constant c8 : bit_vector ( 15 downto 0) := X"3210";
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signal ikey : bit_vector ( 15 downto 0);
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--signal st : bit_vector ( 2 downto 0);
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--signal ldk : bit;
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begin
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--probe
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--keyreg1_prb <= keyreg1;
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--keyreg2_prb <= keyreg2;
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--probe
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--process (clk)
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--begin
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--if ((clk = '1') and clk'event) then
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-- if (rst = '1') then
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-- rk <= (others => '0');
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-- else
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rk <= ikey;
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-- end if;
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--end if;
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--end process;
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process (clk)
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begin
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if ((clk = '1') and clk'event) then
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if (rst = '1') then
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keyreg1 <= (others => '0');
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keyreg2 <= X"0123456789abcdeffedcba9876543210";
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elsif (ldk = '1') then
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keyreg1 <= keyreg1( 63 downto 0) & key;
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keyreg2 <= X"0123456789abcdeffedcba9876543210";
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elsif (st = X"f") then
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keyreg1 <= keyreg1( 95 downto 0) & keyreg1(127 downto 96);
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keyreg2 <= keyreg2( 95 downto 0) & keyreg2(127 downto 96);
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end if;
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end if;
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end process;
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k1 <= keyreg1(127 downto 112);
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k2 <= keyreg1(111 downto 96);
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k3 <= keyreg1( 95 downto 80);
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k4 <= keyreg1( 79 downto 64);
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k5 <= keyreg1( 63 downto 48);
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k6 <= keyreg1( 47 downto 32);
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k7 <= keyreg1( 31 downto 16);
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k8 <= keyreg1( 15 downto 0);
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c1 <= keyreg2(127 downto 112);
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c2 <= keyreg2(111 downto 96);
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c3 <= keyreg2( 95 downto 80);
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c4 <= keyreg2( 79 downto 64);
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c5 <= keyreg2( 63 downto 48);
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c6 <= keyreg2( 47 downto 32);
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c7 <= keyreg2( 31 downto 16);
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c8 <= keyreg2( 15 downto 0);
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process (st,rst,k1,k2,k3,k4,k5,k6,k7,k8,c1,c3,c4,c5,c6,c8)
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begin
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if (rst = '1') then
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ikey <= (others => '0');
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else
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case st is
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when X"0" => --KLi,1
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ikey <= k1(14 downto 0) & k1(15);
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when X"1" => --KLi,2
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ikey <= k3 xor c3;
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when X"2" => --KOi,1
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ikey <= k2(10 downto 0) & k2(15 downto 11);
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when X"3" => --KIi,1
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ikey <= k5 xor c5;
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when X"4" => --KOi,2
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ikey <= k6( 7 downto 0) & k6(15 downto 8);
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when X"5" => --KIi,2
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ikey <= k4 xor c4;
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when X"6" => --KOi,3
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ikey <= k7( 2 downto 0) & k7(15 downto 3);
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when X"7" => --KIi,3
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ikey <= k8 xor c8;
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when X"8" => --KOi,1
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ikey <= k3(10 downto 0) & k3(15 downto 11);
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when X"9" => --KIi,1
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ikey <= k6 xor c6;
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when X"a" => --KOi,2
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ikey <= k7( 7 downto 0) & k7(15 downto 8);
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when X"b" => --KIi,2
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ikey <= k5 xor c5;
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when X"c" => --KOi,3
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ikey <= k8( 2 downto 0) & k8(15 downto 3);
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when X"d" => --KIi,3
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ikey <= k1 xor c1;
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when X"e" => --KLi,1
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ikey <= k2(14 downto 0) & k2(15);
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when X"f" => --KLi,2
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ikey <= k4 xor c4;
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end case;
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end if;
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end process;
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end phy;
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