URL
https://opencores.org/ocsvn/3des_vhdl/3des_vhdl/trunk
Subversion Repositories 3des_vhdl
[/] [3des_vhdl/] [trunk/] [VHDL/] [s6_box.vhd] - Rev 4
Compare with Previous | Blame | View Log
--------------------------------------------------------------------- -- (c) Copyright 2006, CoreTex Systems, LLC -- -- www.coretexsys.com -- -- -- -- This source file may be used and distributed without -- -- restriction provided that this copyright statement is not -- -- removed from the file and that any derivative work contains -- -- the original copyright notice and the associated disclaimer. -- -- -- -- THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY -- -- EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED -- -- TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS -- -- FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL THE AUTHOR -- -- OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, -- -- INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES -- -- (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE -- -- GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR -- -- BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF -- -- LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT -- -- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT -- -- OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE -- -- POSSIBILITY OF SUCH DAMAGE. -- -- -- --------------------------------------------------------------------- ---------------------------------------------------------------------- -- Poject structure: -- |- tdes_top.vhd -- | -- |- des_cipher_top.vhd -- |- des_top.vhd -- |- block_top.vhd -- |- add_key.vhd -- | -- |- add_left.vhd -- | -- |- e_expansion_function.vhd -- | -- |- p_box.vhd -- | -- |- s_box.vhd -- |- s1_box.vhd -- |- s2_box.vhd -- |- s3_box.vhd -- |- s4_box.vhd -- |- s5_box.vhd -- |- s6_box.vhd -- |- s7_box.vhd -- |- s8_box.vhd -- |- key_schedule.vhd ---------------------------------------------------------------------- --------------------------------------------------------------------------------------------------- -- -- Title : s6_box -- Company : CoreTex Systems, LLC -- --------------------------------------------------------------------------------------------------- library IEEE; use IEEE.STD_LOGIC_1164.ALL; use IEEE.STD_LOGIC_ARITH.ALL; use IEEE.STD_LOGIC_UNSIGNED.ALL; ENTITY s6_box IS port ( A: IN std_logic_VECTOR(5 downto 0); SPO: OUT std_logic_VECTOR(3 downto 0)); END s6_box; architecture Behavioral of s6_box is begin SPO <= "1100" when A = x"0" else "1010" when A = x"1" else "0001" when A = x"2" else "1111" when A = x"3" else "1010" when A = x"4" else "0100" when A = x"5" else "1111" when A = x"6" else "0010" when A = x"7" else "1001" when A = x"8" else "0111" when A = x"9" else "0010" when A = x"A" else "1100" when A = x"B" else "0110" when A = x"C" else "1001" when A = x"D" else "1000" when A = x"E" else "0101" when A = x"F" else "0000" when A = x"10" else "0110" when A = x"11" else "1101" when A = x"12" else "0001" when A = x"13" else "0011" when A = x"14" else "1101" when A = x"15" else "0100" when A = x"16" else "1110" when A = x"17" else "1110" when A = x"18" else "0000" when A = x"19" else "0111" when A = x"1A" else "1011" when A = x"1B" else "0101" when A = x"1C" else "0011" when A = x"1D" else "1011" when A = x"1E" else "1000" when A = x"1F" else "1001" when A = x"20" else "0100" when A = x"21" else "1110" when A = x"22" else "0011" when A = x"23" else "1111" when A = x"24" else "0010" when A = x"25" else "0101" when A = x"26" else "1100" when A = x"27" else "0010" when A = x"28" else "1001" when A = x"29" else "1000" when A = x"2A" else "0101" when A = x"2B" else "1100" when A = x"2C" else "1111" when A = x"2D" else "0011" when A = x"2E" else "1010" when A = x"2F" else "0111" when A = x"30" else "1011" when A = x"31" else "0000" when A = x"32" else "1110" when A = x"33" else "0100" when A = x"34" else "0001" when A = x"35" else "1010" when A = x"36" else "0111" when A = x"37" else "0001" when A = x"38" else "0110" when A = x"39" else "1101" when A = x"3A" else "0000" when A = x"3B" else "1011" when A = x"3C" else "1000" when A = x"3D" else "0110" when A = x"3E" else "1101" when A = x"3F" else "1101"; END Behavioral;