1 files changed, 42 insertions, 0 deletions
diff --git a/implementations/vhdl/Decrypt/lilliputtbcii256v1/inner_sbox_a.vhd b/implementations/vhdl/Decrypt/lilliputtbcii256v1/inner_sbox_a.vhd
new file mode 100644
index 0000000..18185a1
--- /dev/null
+++ b/implementations/vhdl/Decrypt/lilliputtbcii256v1/inner_sbox_a.vhd
@@ -0,0 +1,42 @@
+library IEEE;
+library work;
+use IEEE.std_logic_1164.all;
+
+entity inner_sbox_a is
+  port(
+    sbox_i  : in  std_logic_vector(3 downto 0);
+    sbox_o : out std_logic_vector(3 downto 0)
+    );
+end inner_sbox_a;
+
+
+architecture inner_sbox_a_arch of inner_sbox_a is
+
+signal a,b,c,d,x,y,z,t 	:std_logic;
+signal a1,b1,c1,d1,e		:std_logic;
+
+begin
+
+a <= sbox_i(3);
+b <= sbox_i(2);
+c <= sbox_i(1);
+d <= sbox_i(0);
+
+a1 <= e xor a;
+b1 <= b xor c1;
+c1 <= a xor c;
+d1 <= d xor (b and c);
+e 	<= b xor d1;
+
+x <= c1 and e;
+y <= a and d1;
+z <= e;
+t <= a1 and b1;
+
+sbox_o(3) <= x;
+sbox_o(2) <= y;
+sbox_o(1) <= z;
+sbox_o(0) <= t;
+                              
+end;
+