1 files changed, 82 insertions, 0 deletions
diff --git a/implementations/vhdl/Decrypt/lilliputtbcii256v1/sbox.vhd b/implementations/vhdl/Decrypt/lilliputtbcii256v1/sbox.vhd
new file mode 100644
index 0000000..7eee9d8
--- /dev/null
+++ b/implementations/vhdl/Decrypt/lilliputtbcii256v1/sbox.vhd
@@ -0,0 +1,82 @@
+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
+
+component inner_sbox_a
+	port (
+    sbox_i  : in  std_logic_vector(3 downto 0);
+    sbox_o 	: out std_logic_vector(3 downto 0)
+	);
+end component;
+
+component inner_sbox_b
+	port (
+    sbox_i  : in  std_logic_vector(3 downto 0);
+    sbox_o 	: out std_logic_vector(3 downto 0)
+	);
+end component;
+
+component inner_sbox_c
+	port (
+    sbox_i  : in  std_logic_vector(3 downto 0);
+    sbox_o 	: out std_logic_vector(3 downto 0)
+	);
+end component;
+
+signal a,a1,b,b1,c : std_logic_vector(3 downto 0);
+
+begin
+
+inner_sbox_a_t : inner_sbox_a
+port map( 
+    sbox_i => sbox_i(3 downto 0),
+    sbox_o =>  a
+);
+
+a1 <= a xor sbox_i(7 downto 4);
+
+inner_sbox_b_t : inner_sbox_b
+port map( 
+    sbox_i => a1,
+    sbox_o => b
+);
+
+b1 <= b xor sbox_i(3 downto 0);
+
+inner_sbox_c_t : inner_sbox_c
+port map( 
+    sbox_i => b1,
+    sbox_o => c
+);
+          
+sbox_o(7 downto 4) <= c xor a1;
+sbox_o (3 downto 0) <= b1;
+			 
+end sbox_arch;
+
+configuration sbox_conf of sbox is 
+	for sbox_arch
+		for  inner_sbox_a_t : inner_sbox_a
+			use entity work.inner_sbox_a( inner_sbox_a_arch );
+		end for;
+		for  inner_sbox_b_t : inner_sbox_b
+			use entity work.inner_sbox_b( inner_sbox_b_arch );
+		end for;
+		for  inner_sbox_c_t : inner_sbox_c
+			use entity work.inner_sbox_c( inner_sbox_c_arch );
+		end for;
+	end for;
+end configuration sbox_conf ;
+