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328 lines
16 KiB
328 lines
16 KiB
-- ======================================================================
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-- DES encryption/decryption
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-- package file with functions
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-- Copyright (C) 2007 Torsten Meissner
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-------------------------------------------------------------------------
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 2 of the License, or
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-- (at your option) any later version.
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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-- You should have received a copy of the GNU General Public License
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-- along with this program; if not, write to the Free Software
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-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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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.numeric_std.ALL;
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PACKAGE des_pkg IS
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FUNCTION ip ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
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FUNCTION ipn ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
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FUNCTION e (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector;
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FUNCTION p (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector;
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FUNCTION s1 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s2 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s3 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s4 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s5 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s6 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s7 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION s8 (input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector;
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FUNCTION f (input_r : std_logic_vector(0 TO 31); input_key : std_logic_vector(0 TO 47) ) RETURN std_logic_vector;
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FUNCTION pc1_c ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
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FUNCTION pc1_d ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector;
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FUNCTION pc2 ( input_vector : std_logic_vector(0 TO 55) ) RETURN std_logic_vector;
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END PACKAGE des_pkg;
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PACKAGE BODY des_pkg IS
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FUNCTION ip ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
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VARIABLE table : matrix := (57, 49, 41, 33, 25, 17, 9, 1,
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59, 51, 43, 35, 27, 19, 11, 3,
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61, 53, 45, 37, 29, 21, 13, 5,
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63, 55, 47, 39, 31, 23, 15, 7,
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56, 48, 40, 32, 24, 16, 8, 0,
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58, 50, 42, 34, 26, 18, 10, 2,
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60, 52, 44, 36, 28, 20, 12, 4,
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62, 54, 46, 38, 30, 22, 14, 6);
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VARIABLE result : std_logic_vector(0 TO 63);
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BEGIN
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FOR index IN 0 TO 63 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION ip;
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FUNCTION ipn ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
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VARIABLE table : matrix := (39, 7, 47, 15, 55, 23, 63, 31,
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38, 6, 46, 14, 54, 22, 62, 30,
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37, 5, 45, 13, 53, 21, 61, 29,
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36, 4, 44, 12, 52, 20, 60, 28,
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35, 3, 43, 11, 51, 19, 59, 27,
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34, 2, 42, 10, 50, 18, 58, 26,
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33, 1, 41, 9, 49, 17, 57, 25,
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32, 0, 40, 8, 48, 16, 56, 24);
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VARIABLE result : std_logic_vector(0 TO 63);
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BEGIN
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FOR index IN 0 TO 63 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION ipn;
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FUNCTION e (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 31;
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VARIABLE table : matrix := (31, 0, 1, 2, 3, 4,
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3, 4, 5, 6, 7, 8,
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7, 8, 9, 10, 11, 12,
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11, 12, 13, 14, 15, 16,
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15, 16, 17, 18, 19, 20,
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19, 20, 21, 22, 23, 24,
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23, 24, 25, 26, 27, 28,
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27, 28, 29, 30, 31, 0);
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VARIABLE result : std_logic_vector(0 TO 47);
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BEGIN
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FOR index IN 0 TO 47 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION e;
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FUNCTION s1 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => (14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7),
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1 => ( 0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8),
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2 => ( 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0),
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3 => (15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s1;
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FUNCTION s2 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => (15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10),
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1 => ( 3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5),
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2 => ( 0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15),
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3 => (13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s2;
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FUNCTION s3 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => (10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8),
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1 => (13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1),
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2 => (13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7),
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3 => ( 1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s3;
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FUNCTION s4 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => ( 7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15),
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1 => (13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9),
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2 => (10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4),
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3 => ( 3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s4;
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FUNCTION s5 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => ( 2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9),
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1 => (14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6),
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2 => ( 4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14),
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3 => (11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s5;
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FUNCTION s6 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => (12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11),
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1 => (10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8),
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2 => ( 9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6),
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3 => ( 4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s6;
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FUNCTION s7 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => ( 4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1),
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1 => (13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6),
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2 => ( 1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2),
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3 => ( 6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s7;
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FUNCTION s8 ( input_vector : std_logic_vector(0 TO 5) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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VARIABLE table : matrix := (0 => (13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7),
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1 => ( 1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2),
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2 => ( 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8),
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3 => ( 2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11));
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VARIABLE int : std_logic_vector(0 TO 1);
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VARIABLE i : integer RANGE 0 TO 3;
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VARIABLE j : integer RANGE 0 TO 15;
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VARIABLE result : std_logic_vector(0 TO 3);
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BEGIN
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int := input_vector( 0 ) & input_vector( 5 );
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i := to_integer( unsigned( int ) );
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j := to_integer( unsigned( input_vector( 1 TO 4) ) );
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result := std_logic_vector( to_unsigned( table( i, j ), 4 ) );
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RETURN result;
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END FUNCTION s8;
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FUNCTION p (input_vector : std_logic_vector(0 TO 31) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 31) OF natural RANGE 0 TO 31;
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VARIABLE table : matrix := (15, 6, 19, 20,
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28, 11, 27, 16,
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0, 14, 22, 25,
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4, 17, 30, 9,
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1, 7, 23, 13,
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31, 26, 2, 8,
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18, 12, 29, 5,
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21, 10, 3, 24);
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VARIABLE result : std_logic_vector(0 TO 31);
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BEGIN
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FOR index IN 0 TO 31 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION p;
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FUNCTION f (input_r : std_logic_vector(0 TO 31); input_key : std_logic_vector(0 TO 47) ) RETURN std_logic_vector IS
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VARIABLE intern : std_logic_vector(0 TO 47);
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VARIABLE result : std_logic_vector(0 TO 31);
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BEGIN
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intern := e( input_r ) xor input_key;
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result := p( s1( intern(0 TO 5) ) & s2( intern(6 TO 11) ) & s3( intern(12 TO 17) ) & s4( intern(18 TO 23) ) &
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s5( intern(24 TO 29) ) & s6( intern(30 TO 35) ) & s7( intern(36 TO 41) ) & s8( intern(42 TO 47) ) );
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RETURN result;
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END FUNCTION f;
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FUNCTION pc1_c ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 27) OF natural RANGE 0 TO 63;
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VARIABLE table : matrix := (56, 48, 40, 32, 24, 16, 8,
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0, 57, 49, 41, 33, 25, 17,
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9, 1, 58, 50, 42, 34, 26,
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18, 10, 2, 59, 51, 43, 35);
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VARIABLE result : std_logic_vector(0 TO 27);
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BEGIN
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FOR index IN 0 TO 27 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION pc1_c;
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FUNCTION pc1_d ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 27) OF natural RANGE 0 TO 63;
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VARIABLE table : matrix := (62, 54, 46, 38, 30, 22, 14,
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6, 61, 53, 45, 37, 29, 21,
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13, 5, 60, 52, 44, 36, 28,
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20, 12, 4, 27, 19, 11, 3);
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VARIABLE result : std_logic_vector(0 TO 27);
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BEGIN
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FOR index IN 0 TO 27 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION pc1_d;
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FUNCTION pc2 ( input_vector : std_logic_vector(0 TO 55) ) RETURN std_logic_vector IS
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TYPE matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 63;
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VARIABLE table : matrix := (13, 16, 10, 23, 0, 4,
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2, 27, 14, 5, 20, 9,
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22, 18, 11, 3, 25, 7,
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15, 6, 26, 19, 12, 1,
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40, 51, 30, 36, 46, 54,
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29, 39, 50, 44, 32, 47,
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43, 48, 38, 55, 33, 52,
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45, 41, 49, 35, 28, 31);
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VARIABLE result : std_logic_vector(0 TO 47);
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BEGIN
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FOR index IN 0 TO 47 LOOP
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result( index ) := input_vector( table( index ) );
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END LOOP;
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RETURN result;
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END FUNCTION pc2;
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END PACKAGE BODY des_pkg;
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