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cryptocores
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integrate s1-s8() into one s() function with additional parameter s_table; convert lower to upper case

master
T. Meissner 9 years ago
parent
313a08b6f3
commit
8a9b30940e
2 changed files with 324 additions and 416 deletions
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  1. +215
    -217
      des/rtl/vhdl/des.vhd
  2. +109
    -199
      des/rtl/vhdl/des_pkg.vhd

+ 215
- 217
des/rtl/vhdl/des.vhd View File

@ -32,15 +32,15 @@ entity des is
); );
port ( port (
reset_i : in std_logic; -- async reset 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
accept_o : out std_logic; -- input data accepted
data_o : OUT std_logic_vector(0 TO 63); -- data output
valid_o : OUT std_logic; -- output data valid flag
accept_i : in std_logic
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
accept_o : out std_logic; -- input accept
data_o : out std_logic_vector(0 to 63); -- data output
valid_o : out std_logic; -- output data valid flag
accept_i : in std_logic -- output accept
); );
end entity des; end entity des;
@ -56,294 +56,294 @@ begin
begin begin
crypt : PROCESS (clk_i, reset_i) IS
crypt : process (clk_i, reset_i) is
-- variables for key calculation -- 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');
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 -- 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');
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 -- 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');
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 -- 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
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 if(reset_i = '0') then
data_o <= (others => '0'); data_o <= (others => '0');
valid_o <= '0'; valid_o <= '0';
elsif rising_edge( clk_i ) THEN
elsif rising_edge( clk_i ) then
-- shift registers -- shift registers
valid(1 TO 17) := valid(0 TO 16);
valid(1 to 17) := valid(0 to 16);
valid(0) := valid_i; valid(0) := valid_i;
mode(1 TO 16) := mode(0 TO 15);
mode(1 to 16) := mode(0 to 15);
mode(0) := mode_i; mode(0) := mode_i;
-- output stage -- output stage
accept_o <= '1'; accept_o <= '1';
valid_o <= valid(17); valid_o <= valid(17);
data_o <= ipn( ( r16 & l16 ) ); data_o <= ipn( ( r16 & l16 ) );
-- 16. stage -- 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;
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 ) ); key16 := pc2( ( c16 & d16 ) );
l16 := r15; l16 := r15;
r16 := l15 xor ( f( r15, key16 ) ); r16 := l15 xor ( f( r15, key16 ) );
-- 15. stage -- 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;
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 ) ); key15 := pc2( ( c15 & d15 ) );
l15 := r14; l15 := r14;
r15 := l14 xor ( f( r14, key15 ) ); r15 := l14 xor ( f( r14, key15 ) );
-- 14. stage -- 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;
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 ) ); key14 := pc2( ( c14 & d14 ) );
l14 := r13; l14 := r13;
r14 := l13 xor ( f( r13, key14 ) ); r14 := l13 xor ( f( r13, key14 ) );
-- 13. stage -- 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;
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 ) ); key13 := pc2( ( c13 & d13 ) );
l13 := r12; l13 := r12;
r13 := l12 xor ( f( r12, key13 ) ); r13 := l12 xor ( f( r12, key13 ) );
-- 12. stage -- 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;
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 ) ); key12 := pc2( ( c12 & d12 ) );
l12 := r11; l12 := r11;
r12 := l11 xor ( f( r11, key12 ) ); r12 := l11 xor ( f( r11, key12 ) );
-- 11. stage -- 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;
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 ) ); key11 := pc2( ( c11 & d11 ) );
l11 := r10; l11 := r10;
r11 := l10 xor ( f( r10, key11 ) ); r11 := l10 xor ( f( r10, key11 ) );
-- 10. stage -- 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;
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 ) ); key10 := pc2( ( c10 & d10 ) );
l10 := r9; l10 := r9;
r10 := l9 xor ( f( r9, key10 ) ); r10 := l9 xor ( f( r9, key10 ) );
-- 9. stage -- 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;
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 ) ); key9 := pc2( ( c9 & d9 ) );
l9 := r8; l9 := r8;
r9 := l8 xor ( f( r8, key9 ) ); r9 := l8 xor ( f( r8, key9 ) );
-- 8. stage -- 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;
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 ) ); key8 := pc2( ( c8 & d8 ) );
l8 := r7; l8 := r7;
r8 := l7 xor ( f( r7, key8 ) ); r8 := l7 xor ( f( r7, key8 ) );
-- 7. stage -- 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;
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 ) ); key7 := pc2( ( c7 & d7 ) );
l7 := r6; l7 := r6;
r7 := l6 xor ( f( r6, key7 ) ); r7 := l6 xor ( f( r6, key7 ) );
-- 6. stage -- 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;
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 ) ); key6 := pc2( ( c6 & d6 ) );
l6 := r5; l6 := r5;
r6 := l5 xor ( f( r5, key6 ) ); r6 := l5 xor ( f( r5, key6 ) );
-- 5. stage -- 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;
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 ) ); key5 := pc2( ( c5 & d5 ) );
l5 := r4; l5 := r4;
r5 := l4 xor ( f( r4, key5 ) ); r5 := l4 xor ( f( r4, key5 ) );
-- 4. stage -- 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;
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 ) ); key4 := pc2( ( c4 & d4 ) );
l4 := r3; l4 := r3;
r4 := l3 xor ( f( r3, key4 ) ); r4 := l3 xor ( f( r3, key4 ) );
-- 3. stage -- 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;
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 ) ); key3 := pc2( ( c3 & d3 ) );
l3 := r2; l3 := r2;
r3 := l2 xor ( f( r2, key3 ) ); r3 := l2 xor ( f( r2, key3 ) );
-- 2. stage -- 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;
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 ) ); key2 := pc2( ( c2 & d2 ) );
l2 := r1; l2 := r1;
r2 := l1 xor ( f( r1, key2 ) ); r2 := l1 xor ( f( r1, key2 ) );
-- 1. stage -- 1. stage
IF mode(1) = '0' THEN
c1 := c0(1 TO 27) & c0(0);
d1 := d0(1 TO 27) & d0(0);
ELSE
if mode(1) = '0' then
c1 := c0(1 to 27) & c0(0);
d1 := d0(1 to 27) & d0(0);
else
c1 := c0; c1 := c0;
d1 := d0; d1 := d0;
END IF;
end if;
key1 := pc2( ( c1 & d1 ) ); key1 := pc2( ( c1 & d1 ) );
l1 := r0; l1 := r0;
r1 := l0 xor ( f( r0, key1 ) ); r1 := l0 xor ( f( r0, key1 ) );
-- input stage -- input stage
l0 := ip( data_i )(0 TO 31);
r0 := ip( data_i )(32 TO 63);
l0 := ip( data_i )(0 to 31);
r0 := ip( data_i )(32 to 63);
c0 := pc1_c( key_i ); c0 := pc1_c( key_i );
d0 := pc1_d( key_i ); d0 := pc1_d( key_i );
END IF;
END PROCESS crypt;
end if;
end process crypt;
end generate PipeG; end generate PipeG;
@ -358,7 +358,6 @@ begin
begin begin
cryptP : process (clk_i, reset_i) is cryptP : process (clk_i, reset_i) is
variable v_c : std_logic_vector(0 to 27); variable v_c : std_logic_vector(0 to 27);
variable v_d : std_logic_vector(0 to 27); variable v_d : std_logic_vector(0 to 27);
@ -624,5 +623,4 @@ begin
end generate AreaG; end generate AreaG;
END ARCHITECTURE rtl;
end architecture rtl;

+ 109
- 199
des/rtl/vhdl/des_pkg.vhd View File

@ -20,37 +20,16 @@
LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.numeric_std.ALL;
library ieee;
use ieee.std_logic_1164.all;
use ieee.numeric_std.all;
PACKAGE des_pkg IS
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;
TYPE ip_matrix IS ARRAY (0 TO 63) OF natural RANGE 0 TO 63;
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, constant ip_table : ip_matrix := (57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3, 59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5, 61, 53, 45, 37, 29, 21, 13, 5,
@ -68,7 +47,7 @@ PACKAGE des_pkg IS
33, 1, 41, 9, 49, 17, 57, 25, 33, 1, 41, 9, 49, 17, 57, 25,
32, 0, 40, 8, 48, 16, 56, 24); 32, 0, 40, 8, 48, 16, 56, 24);
TYPE e_matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 31;
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, constant e_table : e_matrix := (31, 0, 1, 2, 3, 4,
3, 4, 5, 6, 7, 8, 3, 4, 5, 6, 7, 8,
7, 8, 9, 10, 11, 12, 7, 8, 9, 10, 11, 12,
@ -78,7 +57,7 @@ PACKAGE des_pkg IS
23, 24, 25, 26, 27, 28, 23, 24, 25, 26, 27, 28,
27, 28, 29, 30, 31, 0); 27, 28, 29, 30, 31, 0);
TYPE s_matrix IS ARRAY (0 TO 3, 0 TO 15) OF integer RANGE 0 TO 15;
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), 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), 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), 2 => ( 4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0),
@ -112,7 +91,7 @@ PACKAGE des_pkg IS
2 => ( 7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8), 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)); 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;
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, constant pc1c_table : pc_matrix := (56, 48, 40, 32, 24, 16, 8,
0, 57, 49, 41, 33, 25, 17, 0, 57, 49, 41, 33, 25, 17,
9, 1, 58, 50, 42, 34, 26, 9, 1, 58, 50, 42, 34, 26,
@ -122,7 +101,7 @@ PACKAGE des_pkg IS
13, 5, 60, 52, 44, 36, 28, 13, 5, 60, 52, 44, 36, 28,
20, 12, 4, 27, 19, 11, 3); 20, 12, 4, 27, 19, 11, 3);
type p_matrix IS ARRAY (0 TO 31) OF natural RANGE 0 TO 31;
type p_matrix is array (0 to 31) of natural range 0 to 31;
constant p_table : p_matrix := (15, 6, 19, 20, constant p_table : p_matrix := (15, 6, 19, 20,
28, 11, 27, 16, 28, 11, 27, 16,
0, 14, 22, 25, 0, 14, 22, 25,
@ -132,7 +111,7 @@ PACKAGE des_pkg IS
18, 12, 29, 5, 18, 12, 29, 5,
21, 10, 3, 24); 21, 10, 3, 24);
type pc2_matrix IS ARRAY (0 TO 47) OF natural RANGE 0 TO 63;
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, constant pc2_table : pc2_matrix := (13, 16, 10, 23, 0, 4,
2, 27, 14, 5, 20, 9, 2, 27, 14, 5, 20, 9,
22, 18, 11, 3, 25, 7, 22, 18, 11, 3, 25, 7,
@ -142,191 +121,122 @@ PACKAGE des_pkg IS
43, 48, 38, 55, 33, 52, 43, 48, 38, 55, 33, 52,
45, 41, 49, 35, 28, 31); 45, 41, 49, 35, 28, 31);
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 s (input_vector : std_logic_vector(0 to 5); s_table : s_matrix ) 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;
end package des_pkg;
PACKAGE BODY des_pkg IS
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
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( ip_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
VARIABLE result : std_logic_vector(0 TO 63);
BEGIN
FOR index IN 0 TO 63 LOOP
end loop;
return result;
end function ip;
function ipn ( 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( ipn_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
VARIABLE result : std_logic_vector(0 TO 47);
BEGIN
FOR index IN 0 TO 47 LOOP
end loop;
return result;
end function ipn;
function e (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector is
variable result : std_logic_vector(0 to 47);
begin
for index IN 0 to 47 loop
result( index ) := input_vector( e_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
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( 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
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( 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
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( 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
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( 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
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( 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
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( 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
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( 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
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
end loop;
return result;
end function e;
function s ( input_vector : std_logic_vector(0 to 5); s_table : s_matrix ) return std_logic_vector is
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 ); int := input_vector( 0 ) & input_vector( 5 );
i := to_integer( unsigned( int ) ); i := to_integer( unsigned( int ) );
j := to_integer( unsigned( input_vector( 1 TO 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
VARIABLE result : std_logic_vector(0 TO 31);
BEGIN
FOR index IN 0 TO 31 LOOP
j := to_integer( unsigned( input_vector( 1 to 4) ) );
result := std_logic_vector( to_unsigned( s_table( i, j ), 4 ) );
return result;
end function s;
function p (input_vector : std_logic_vector(0 to 31) ) return std_logic_vector is
variable result : std_logic_vector(0 to 31);
begin
for index IN 0 to 31 loop
result( index ) := input_vector( p_table( index ) ); result( index ) := input_vector( p_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
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; 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
VARIABLE result : std_logic_vector(0 TO 27);
BEGIN
FOR index IN 0 TO 27 LOOP
result := p( s( intern(0 to 5), s1_table ) & s( intern(6 to 11), s2_table ) & s( intern(12 to 17), s3_table ) &
s( intern(18 to 23), s4_table ) & s( intern(24 to 29), s5_table ) & s( intern(30 to 35), s6_table ) &
s( intern(36 to 41), s7_table ) & s( intern(42 to 47), s8_table ) );
return result;
end function f;
function pc1_c ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
variable result : std_logic_vector(0 to 27);
begin
for index IN 0 to 27 loop
result( index ) := input_vector( pc1c_table( index ) ); result( index ) := input_vector( pc1c_table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc1_c;
end loop;
return result;
end function pc1_c;
FUNCTION pc1_d ( input_vector : std_logic_vector(0 TO 63) ) RETURN std_logic_vector IS
VARIABLE result : std_logic_vector(0 TO 27);
BEGIN
FOR index IN 0 TO 27 LOOP
function pc1_d ( input_vector : std_logic_vector(0 to 63) ) return std_logic_vector is
variable result : std_logic_vector(0 to 27);
begin
for index IN 0 to 27 loop
result( index ) := input_vector( pc1d_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
VARIABLE result : std_logic_vector(0 TO 47);
BEGIN
FOR index IN 0 TO 47 LOOP
end loop;
return result;
end function pc1_d;
function pc2 ( input_vector : std_logic_vector(0 to 55) ) return std_logic_vector is
variable result : std_logic_vector(0 to 47);
begin
for index IN 0 to 47 loop
result( index ) := input_vector( pc2_table( index ) ); result( index ) := input_vector( pc2_table( index ) );
END LOOP;
RETURN result;
END FUNCTION pc2;
end loop;
return result;
end function pc2;
END PACKAGE BODY des_pkg;
end package body des_pkg;

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