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dasdsad

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Torsten Meissner 13 years ago
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    -334
      des/rtl/vhdl/des.vhd
  2. +0
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      des/rtl/vhdl/des_pkg.vhd

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des/rtl/vhdl/des.vhd View File

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-- ======================================================================
-- DES encryption/decryption
-- algorithm according to FIPS 46-3 specification
-- Copyright (C) 2007 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 work.des_pkg.ALL;
ENTITY des IS
PORT (
reset_i : in std_logic; -- async reset
clk_i : IN std_logic; -- clock
mode_i : IN std_logic; -- des-modus: 0 = encrypt, 1 = decrypt
key_i : IN std_logic_vector(0 TO 63); -- key input
data_i : IN std_logic_vector(0 TO 63); -- data input
valid_i : IN std_logic; -- input key/data valid flag
data_o : OUT std_logic_vector(0 TO 63); -- data output
valid_o : OUT std_logic -- output data valid flag
);
END ENTITY des;
ARCHITECTURE rtl OF des IS
BEGIN
crypt : PROCESS ( clk_i ) IS
-- variables for key calculation
VARIABLE c0 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c1 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c2 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c3 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c4 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c5 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c6 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c7 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c8 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c9 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c10 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c11 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c12 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c13 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c14 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c15 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE c16 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d0 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d1 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d2 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d3 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d4 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d5 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d6 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d7 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d8 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d9 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d10 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d11 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d12 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d13 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d14 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d15 : std_logic_vector(0 TO 27) := (others => '0');
VARIABLE d16 : std_logic_vector(0 TO 27) := (others => '0');
-- key variables
VARIABLE key1 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key2 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key3 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key4 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key5 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key6 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key7 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key8 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key9 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key10 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key11 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key12 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key13 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key14 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key15 : std_logic_vector(0 TO 47) := (others => '0');
VARIABLE key16 : std_logic_vector(0 TO 47) := (others => '0');
-- variables for left & right data blocks
VARIABLE l0 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l1 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l2 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l3 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l4 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l5 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l6 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l7 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l8 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l9 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l10 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l11 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l12 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l13 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l14 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l15 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE l16 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r0 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r1 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r2 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r3 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r4 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r5 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r6 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r7 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r8 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r9 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r10 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r11 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r12 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r13 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r14 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r15 : std_logic_vector( 0 TO 31) := (others => '0');
VARIABLE r16 : std_logic_vector( 0 TO 31) := (others => '0');
-- variables for mode & valid shift registers
VARIABLE mode : std_logic_vector(0 TO 16) := (others => '0');
VARIABLE valid : std_logic_vector(0 TO 17) := (others => '0');
BEGIN
if(reset_i = '0') then
data_o <= (others => '0');
valid_o <= '0';
elsif rising_edge( clk_i ) THEN
-- shift registers
valid(1 TO 17) := valid(0 TO 16);
valid(0) := valid_i;
mode(1 TO 16) := mode(0 TO 15);
mode(0) := mode_i;
-- output stage
valid_o <= valid(17);
data_o <= ipn( ( r16 & l16 ) );
-- 16. stage
IF mode(16) = '0' THEN
c16 := c15(1 TO 27) & c15(0);
d16 := d15(1 TO 27) & d15(0);
ELSE
c16 := c15(27) & c15(0 TO 26);
d16 := d15(27) & d15(0 TO 26);
END IF;
key16 := pc2( ( c16 & d16 ) );
l16 := r15;
r16 := l15 xor ( f( r15, key16 ) );
-- 15. stage
IF mode(15) = '0' THEN
c15 := c14(2 TO 27) & c14(0 TO 1);
d15 := d14(2 TO 27) & d14(0 TO 1);
ELSE
c15 := c14(26 TO 27) & c14(0 TO 25);
d15 := d14(26 TO 27) & d14(0 TO 25);
END IF;
key15 := pc2( ( c15 & d15 ) );
l15 := r14;
r15 := l14 xor ( f( r14, key15 ) );
-- 14. stage
IF mode(14) = '0' THEN
c14 := c13(2 TO 27) & c13(0 TO 1);
d14 := d13(2 TO 27) & d13(0 TO 1);
ELSE
c14 := c13(26 TO 27) & c13(0 TO 25);
d14 := d13(26 TO 27) & d13(0 TO 25);
END IF;
key14 := pc2( ( c14 & d14 ) );
l14 := r13;
r14 := l13 xor ( f( r13, key14 ) );
-- 13. stage
IF mode(13) = '0' THEN
c13 := c12(2 TO 27) & c12(0 TO 1);
d13 := d12(2 TO 27) & d12(0 TO 1);
ELSE
c13 := c12(26 TO 27) & c12(0 TO 25);
d13 := d12(26 TO 27) & d12(0 TO 25);
END IF;
key13 := pc2( ( c13 & d13 ) );
l13 := r12;
r13 := l12 xor ( f( r12, key13 ) );
-- 12. stage
IF mode(12) = '0' THEN
c12 := c11(2 TO 27) & c11(0 TO 1);
d12 := d11(2 TO 27) & d11(0 TO 1);
ELSE
c12 := c11(26 TO 27) & c11(0 TO 25);
d12 := d11(26 TO 27) & d11(0 TO 25);
END IF;
key12 := pc2( ( c12 & d12 ) );
l12 := r11;
r12 := l11 xor ( f( r11, key12 ) );
-- 11. stage
IF mode(11) = '0' THEN
c11 := c10(2 TO 27) & c10(0 TO 1);
d11 := d10(2 TO 27) & d10(0 TO 1);
ELSE
c11 := c10(26 TO 27) & c10(0 TO 25);
d11 := d10(26 TO 27) & d10(0 TO 25);
END IF;
key11 := pc2( ( c11 & d11 ) );
l11 := r10;
r11 := l10 xor ( f( r10, key11 ) );
-- 10. stage
IF mode(10) = '0' THEN
c10 := c9(2 TO 27) & c9(0 TO 1);
d10 := d9(2 TO 27) & d9(0 TO 1);
ELSE
c10 := c9(26 TO 27) & c9(0 TO 25);
d10 := d9(26 TO 27) & d9(0 TO 25);
END IF;
key10 := pc2( ( c10 & d10 ) );
l10 := r9;
r10 := l9 xor ( f( r9, key10 ) );
-- 9. stage
IF mode(9) = '0' THEN
c9 := c8(1 TO 27) & c8(0);
d9 := d8(1 TO 27) & d8(0);
ELSE
c9 := c8(27) & c8(0 TO 26);
d9 := d8(27) & d8(0 TO 26);
END IF;
key9 := pc2( ( c9 & d9 ) );
l9 := r8;
r9 := l8 xor ( f( r8, key9 ) );
-- 8. stage
IF mode(8) = '0' THEN
c8 := c7(2 TO 27) & c7(0 TO 1);
d8 := d7(2 TO 27) & d7(0 TO 1);
ELSE
c8 := c7(26 TO 27) & c7(0 TO 25);
d8 := d7(26 TO 27) & d7(0 TO 25);
END IF;
key8 := pc2( ( c8 & d8 ) );
l8 := r7;
r8 := l7 xor ( f( r7, key8 ) );
-- 7. stage
IF mode(7) = '0' THEN
c7 := c6(2 TO 27) & c6(0 TO 1);
d7 := d6(2 TO 27) & d6(0 TO 1);
ELSE
c7 := c6(26 TO 27) & c6(0 TO 25);
d7 := d6(26 TO 27) & d6(0 TO 25);
END IF;
key7 := pc2( ( c7 & d7 ) );
l7 := r6;
r7 := l6 xor ( f( r6, key7 ) );
-- 6. stage
IF mode(6) = '0' THEN
c6 := c5(2 TO 27) & c5(0 TO 1);
d6 := d5(2 TO 27) & d5(0 TO 1);
ELSE
c6 := c5(26 TO 27) & c5(0 TO 25);
d6 := d5(26 TO 27) & d5(0 TO 25);
END IF;
key6 := pc2( ( c6 & d6 ) );
l6 := r5;
r6 := l5 xor ( f( r5, key6 ) );
-- 5. stage
IF mode(5) = '0' THEN
c5 := c4(2 TO 27) & c4(0 TO 1);
d5 := d4(2 TO 27) & d4(0 TO 1);
ELSE
c5 := c4(26 TO 27) & c4(0 TO 25);
d5 := d4(26 TO 27) & d4(0 TO 25);
END IF;
key5 := pc2( ( c5 & d5 ) );
l5 := r4;
r5 := l4 xor ( f( r4, key5 ) );
-- 4. stage
IF mode(4) = '0' THEN
c4 := c3(2 TO 27) & c3(0 TO 1);
d4 := d3(2 TO 27) & d3(0 TO 1);
ELSE
c4 := c3(26 TO 27) & c3(0 TO 25);
d4 := d3(26 TO 27) & d3(0 TO 25);
END IF;
key4 := pc2( ( c4 & d4 ) );
l4 := r3;
r4 := l3 xor ( f( r3, key4 ) );
-- 3. stage
IF mode(3) = '0' THEN
c3 := c2(2 TO 27) & c2(0 TO 1);
d3 := d2(2 TO 27) & d2(0 TO 1);
ELSE
c3 := c2(26 TO 27) & c2(0 TO 25);
d3 := d2(26 TO 27) & d2(0 TO 25);
END IF;
key3 := pc2( ( c3 & d3 ) );
l3 := r2;
r3 := l2 xor ( f( r2, key3 ) );
-- 2. stage
IF mode(2) = '0' THEN
c2 := c1(1 TO 27) & c1(0);
d2 := d1(1 TO 27) & d1(0);
ELSE
c2 := c1(27) & c1(0 TO 26);
d2 := d1(27) & d1(0 TO 26);
END IF;
key2 := pc2( ( c2 & d2 ) );
l2 := r1;
r2 := l1 xor ( f( r1, key2 ) );
-- 1. stage
IF mode(1) = '0' THEN
c1 := c0(1 TO 27) & c0(0);
d1 := d0(1 TO 27) & d0(0);
ELSE
c1 := c0;
d1 := d0;
END IF;
key1 := pc2( ( c1 & d1 ) );
l1 := r0;
r1 := l0 xor ( f( r0, key1 ) );
-- input stage
l0 := ip( data_i )(0 TO 31);
r0 := ip( data_i )(32 TO 63);
c0 := pc1_c( key_i );
d0 := pc1_d( key_i );
END IF;
END PROCESS crypt;
END ARCHITECTURE rtl;

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des/rtl/vhdl/des_pkg.vhd View File

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-- ======================================================================
-- DES encryption/decryption
-- package file with functions
-- Copyright (C) 2007 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
-- ======================================================================
-- Revision 1.0 2007/02/04
-- Initial release
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.ALL;
PACKAGE des_pkg IS
FUNCTION ip ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
FUNCTION ipn ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
FUNCTION e (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector;
FUNCTION p (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector;
FUNCTION s1 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s2 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s3 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s4 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s5 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s6 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s7 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION s8 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
FUNCTION f (input_r : std_logic_vector(0 TO 31); input_key : std_logic_vector(0 TO 47) ) RETURN std_logic_vector;
FUNCTION pc1_c ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
FUNCTION pc1_d ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
FUNCTION pc2 ( input_vector : std_logic_vector(0 TO 55) ) RETURN std_logic_vector;
END PACKAGE des_pkg;
PACKAGE BODY des_pkg IS
FUNCTION ip ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
VARIABLE table : matrix := (57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7,
56, 48, 40, 32, 24, 16, 8, 0,
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6);
VARIABLE result : std_logic_vector(0 TO 63);
BEGIN
FOR index IN 0 TO 63 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION ip;
FUNCTION ipn ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
VARIABLE table : matrix := (39, 7, 47, 15, 55, 23, 63, 31,
38, 6, 46, 14, 54, 22, 62, 30,
37, 5, 45, 13, 53, 21, 61, 29,
36, 4, 44, 12, 52, 20, 60, 28,
35, 3, 43, 11, 51, 19, 59, 27,
34, 2, 42, 10, 50, 18, 58, 26,
33, 1, 41, 9, 49, 17, 57, 25,
32, 0, 40, 8, 48, 16, 56, 24);
VARIABLE result : std_logic_vector(0 TO 63);
BEGIN
FOR index IN 0 TO 63 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION ipn;
FUNCTION e (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 31;
VARIABLE table : matrix := (31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12,
11, 12, 13, 14, 15, 16,
15, 16, 17, 18, 19, 20,
19, 20, 21, 22, 23, 24,
23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 0);
VARIABLE result : std_logic_vector(0 TO 47);
BEGIN
FOR index IN 0 TO 47 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION e;
FUNCTION s1 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => (14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7),
1 => ( 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8),
2 => ( 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0),
3 => (15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s1;
FUNCTION s2 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => (15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10),
1 => ( 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5),
2 => ( 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15),
3 => (13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s2;
FUNCTION s3 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => (10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8),
1 => (13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1),
2 => (13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7),
3 => ( 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s3;
FUNCTION s4 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => ( 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15),
1 => (13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9),
2 => (10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4),
3 => ( 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s4;
FUNCTION s5 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => ( 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9),
1 => (14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6),
2 => ( 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14),
3 => (11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s5;
FUNCTION s6 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => (12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11),
1 => (10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8),
2 => ( 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6),
3 => ( 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s6;
FUNCTION s7 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => ( 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1),
1 => (13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6),
2 => ( 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2),
3 => ( 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s7;
FUNCTION s8 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
VARIABLE table : matrix := (0 => (13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7),
1 => ( 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2),
2 => ( 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8),
3 => ( 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11));
VARIABLE int : std_logic_vector(0 TO 1);
VARIABLE i : integer RANGE 0 TO 3;
VARIABLE j : integer RANGE 0 TO 15;
VARIABLE result : std_logic_vector(0 TO 3);
BEGIN
int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 4) ) );
result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
RETURN result;
END FUNCTION s8;
FUNCTION p (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 31) OF natural RANGE 0 TO 31;
VARIABLE table : matrix := (15, 6, 19, 20,
28, 11, 27, 16,
0, 14, 22, 25,
4, 17, 30, 9,
1, 7, 23, 13,
31, 26, 2, 8,
18, 12, 29, 5,
21, 10, 3, 24);
VARIABLE result : std_logic_vector(0 TO 31);
BEGIN
FOR index IN 0 TO 31 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION p;
FUNCTION f (input_r : std_logic_vector(0 TO 31); input_key : std_logic_vector(0 TO 47) ) RETURN std_logic_vector IS
VARIABLE intern : std_logic_vector(0 TO 47);
VARIABLE result : std_logic_vector(0 TO 31);
BEGIN
intern := e( input_r ) xor input_key;
result := p( s1( intern(0 TO 5) ) & s2( intern(6 TO 11) ) & s3( intern(12 TO 17) ) & s4( intern(18 TO 23) ) &
s5( intern(24 TO 29) ) & s6( intern(30 TO 35) ) & s7( intern(36 TO 41) ) & s8( intern(42 TO 47) ) );
RETURN result;
END FUNCTION f;
FUNCTION pc1_c ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 27) OF natural RANGE 0 TO 63;
VARIABLE table : matrix := (56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26,
18, 10, 2, 59, 51, 43, 35);
VARIABLE result : std_logic_vector(0 TO 27);
BEGIN
FOR index IN 0 TO 27 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc1_c;
FUNCTION pc1_d ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 27) OF natural RANGE 0 TO 63;
VARIABLE table : matrix := (62, 54, 46, 38, 30, 22, 14,
6, 61, 53, 45, 37, 29, 21,
13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3);
VARIABLE result : std_logic_vector(0 TO 27);
BEGIN
FOR index IN 0 TO 27 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc1_d;
FUNCTION pc2 ( input_vector : std_logic_vector(0 TO 55) ) RETURN std_logic_vector IS
TYPE matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 63;
VARIABLE table : matrix := (13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7,
15, 6, 26, 19, 12, 1,
40, 51, 30, 36, 46, 54,
29, 39, 50, 44, 32, 47,
43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31);
VARIABLE result : std_logic_vector(0 TO 47);
BEGIN
FOR index IN 0 TO 47 LOOP
result( index ) := input_vector( table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc2;
END PACKAGE BODY des_pkg;

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