DES算法使用vhdl硬件语言实现.doc

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1、libraryieee;useieee.std_logic_1164.all;useieee.std_logic_arith.all;useieee.std_logic_unsigned.all;packagedes_libiscomponentdesport(clk:instd_logic;reset:instd_logic;encrypt:instd_logic;key_in:instd_logic_vector(55downto0);din:instd_logic_vector(63downto0);din_valid:instd

2、_logic;busy:bufferstd_logic;dout:outstd_logic_vector(63downto0);dout_valid:outstd_logic);endcomponent;componentdes_roundport(clk:instd_logic;reset:instd_logic;stall:instd_logic;encrypt_in:instd_logic;encrypt_shift:instd_logic_vector(4downto0);decrypt_shift:instd_logic_ve

3、ctor(4downto0);key_in:instd_logic_vector(55downto0);din:instd_logic_vector(63downto0);din_valid:instd_logic;encrypt_out:outstd_logic;key_out:outstd_logic_vector(55downto0);dout:outstd_logic_vector(63downto0);dout_valid:outstd_logic);endcomponent;--Initalpermutationfuncti

4、ondes_ip(din:std_logic_vector(63downto0))returnstd_logic_vector;--Finalpermutationfunctiondes_fp(din:std_logic_vector(63downto0))returnstd_logic_vector;--Keypermutation,convertsa64bitkeyintoa56bitkey,ignoringparityfunctiondes_kp(din:std_logic_vector(63downto0))returnstd_

5、logic_vector;--CompressionPermutation,convertsa56bitkeyintoa48bits.functiondes_cp(din:std_logic_vector(55downto0))returnstd_logic_vector;--Expansionpermutationfunctiondes_ep(din:std_logic_vector(31downto0))returnstd_logic_vector;--S-BoxSubstitution,48bitsin,32bitsout.fun

6、ctiondes_sbox(din:std_logic_vector(47downto0))returnstd_logic_vector;--P-BoxPermutationfunctiondes_pbox(din:std_logic_vector(31downto0))returnstd_logic_vector;--KeyShiftfunctiondes_keyshift(din:std_logic_vector(55downto0);n:std_logic_vector(4downto0))returnstd_logic_vect

7、or;enddes_lib;----------------------------------------------------------------------------libraryieee;useieee.std_logic_1164.all;useieee.std_logic_arith.all;useieee.std_logic_unsigned.all;librarywork;usework.des_lib.all;packagebodydes_libis-------------------------------

8、---------------------------Initalpermutationfunctiondes_ip(din:std_logic_vector(63downto0))returnstd_lo