Remplacement de la version vhdltbc par la version optimisée et corrigée

1 files changed, 70 insertions, 0 deletions

diff --git a/src/add_vhdltbc/sbox.vhd b/src/add_vhdltbc/sbox.vhd
new file mode 100644
index 0000000..bf6448c
--- /dev/null
+++ b/src/add_vhdltbc/sbox.vhd
@@ -0,0 +1,70 @@
+-- Implementation of the Lilliput-TBC tweakable block cipher by the
+-- Lilliput-AE team, hereby denoted as "the implementer".
+--
+-- For more information, feedback or questions, refer to our website:
+-- https://paclido.fr/lilliput-ae
+--
+-- To the extent possible under law, the implementer has waived all copyright
+-- and related or neighboring rights to the source code in this file.
+-- http://creativecommons.org/publicdomain/zero/1.0/
+
+library IEEE;
+library work;
+use IEEE.std_logic_1164.all;
+use work.crypt_pack.all;
+
+entity sbox is
+	port(
+		sbox_i : in  bit8;
+		sbox_o : out bit8
+	);
+end sbox;
+
+
+
+architecture sbox_arch of sbox is
+
+	signal a,b : std_logic_vector(3 downto 0);
+
+	signal ax,ay,at,az : std_logic;
+	signal aa,ab       : std_logic;
+
+	signal bx,bz : std_logic;
+	signal bt,by : std_logic;
+
+	signal cx,cy,ct : std_logic;
+	signal ca,cb,cz : std_logic;
+
+begin
+
+
+	aa <= sbox_i(3) xor sbox_i(1);
+	ab <= sbox_i(0) xor (sbox_i(2) and sbox_i(1));
+
+	az <= sbox_i(2) xor ab;
+	ax <= aa and (sbox_i(2) xor ab);
+	ay <= sbox_i(3) and ab;
+	at <= (az xor sbox_i(3)) and (sbox_i(2) xor aa);
+
+	a <= ax & ay & az & at xor sbox_i(7 downto 4);
+
+	bx <= a(0) xor (a(3) and by);
+	bz <= a(3) xor (bt and by);
+	by <= a(2) xor (a(0) and a(1));
+	bt <= a(1) xor (a(3) and a(0));
+
+	b <= bx & by & bz & bt xor sbox_i(3 downto 0);
+
+	ca <= b(3) xor b(1);
+	cb <= not (b(0) xor (b(2) and b(1)));
+
+	cx <= ca and cz;
+	cz <= b(2) xor cb;
+	cy <= b(3) and cb;
+	ct <= (cz xor b(3)) and (b(2) xor ca);
+
+	sbox_o (7 downto 4) <= cx & cy & cz & ct xor a;
+	sbox_o (3 downto 0) <= b;
+
+end sbox_arch;
+