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moved array type definitions out of functions to head of package, instances now also in package head and are constants

master
T. Meissner 12 years ago
parent
716ce2725b
commit
a89d5ba3d8
1 changed files with 117 additions and 109 deletions
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  1. +117
    -109
      cbctdes/rtl/vhdl/des_pkg.vhd

+ 117
- 109
cbctdes/rtl/vhdl/des_pkg.vhd View File

@ -19,13 +19,20 @@
-- ======================================================================
-- 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;
@ -47,14 +54,8 @@ PACKAGE des_pkg IS
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,
TYPE ip_matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
constant ip_table : ip_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,
@ -62,56 +63,125 @@ PACKAGE BODY des_pkg IS
58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6);
constant ipn_table : ip_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);
TYPE e_matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 31;
constant e_table : e_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);
TYPE s_matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
constant s1_table : s_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));
constant s2_table : s_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));
constant s3_table : s_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));
constant s4_table : s_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));
constant s5_table : s_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));
constant s6_table : s_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));
constant s7_table : s_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));
constant s8_table : s_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));
type pc_matrix IS ARRAY (0 TO 27) OF natural RANGE 0 TO 63;
constant pc1c_table : pc_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);
constant pc1d_table : pc_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);
type p_matrix IS ARRAY (0 TO 31) OF natural RANGE 0 TO 31;
constant p_table : p_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);
type pc2_matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 63;
constant pc2_table : pc2_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);
END PACKAGE des_pkg;
PACKAGE BODY des_pkg IS
FUNCTION ip ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
VARIABLE result : std_logic_vector(0 TO 63);
BEGIN
FOR index IN 0 TO 63 LOOP
result( index ) := input_vector( table( index ) );
result( index ) := input_vector( ip_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 ) );
result( index ) := input_vector( ipn_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 ) );
result( index ) := input_vector( e_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;
@ -120,16 +190,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s1_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;
@ -138,16 +203,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s2_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;
@ -156,16 +216,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s3_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;
@ -174,16 +229,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s4_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;
@ -192,16 +242,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s5_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;
@ -210,16 +255,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s6_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;
@ -228,16 +268,11 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s7_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;
@ -246,24 +281,15 @@ PACKAGE BODY des_pkg IS
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 ) );
result := std_logic_vector( to_unsigned( s8_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 ) );
result( index ) := input_vector( p_table( index ) );
END LOOP;
RETURN result;
END FUNCTION p;
@ -279,47 +305,29 @@ PACKAGE BODY des_pkg IS
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 ) );
result( index ) := input_vector( pc1c_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 ) );
result( index ) := input_vector( pc1d_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 ) );
result( index ) := input_vector( pc2_table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc2;


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