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des_util.py
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des_util.py
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# 初始置换 IP
IP_TABLE = [58, 50, 42, 34, 26, 18, 10, 2,
60, 52, 44, 36, 28, 20, 12, 4,
62, 54, 46, 38, 30, 22, 14, 6,
64, 56, 48, 40, 32, 24, 16, 8,
57, 49, 41, 33, 25, 17, 9, 1,
59, 51, 43, 35, 27, 19, 11, 3,
61, 53, 45, 37, 29, 21, 13, 5,
63, 55, 47, 39, 31, 23, 15, 7]
# 逆置换
IPR_Table = [40, 8, 48, 16, 56, 24, 64, 32, 39,
7, 47, 15, 55, 23, 63, 31, 38, 6,
46, 14, 54, 22, 62, 30, 37, 5, 45,
13, 53, 21, 61, 29, 36, 4, 44, 12,
52, 20, 60, 28, 35, 3, 43, 11, 51,
19, 59, 27, 34, 2, 42, 10, 50, 18,
58, 26, 33, 1, 41, 9, 49, 17, 57, 25]
# 扩展置换 E
E_TABLE = [32, 1, 2, 3, 4, 5, 4, 5,
6, 7, 8, 9, 8, 9, 10, 11,
12, 13, 12, 13, 14, 15, 16, 17,
16, 17, 18, 19, 20, 21, 20, 21,
22, 23, 24, 25, 24, 25, 26, 27,
28, 29, 28, 29, 30, 31, 32, 1]
# P盒
P_BOX_TABLE = [16, 7, 20, 21, 29, 12, 28, 17,
1, 15, 23, 26, 5, 18, 31, 10,
2, 8, 24, 14, 32, 27, 3, 9,
19, 13, 30, 6, 22, 11, 4, 25]
# S盒
S_BOX_TABLE = [
[14, 4, 13, 1, 2, 15, 11, 8, 3, 10, 6, 12, 5, 9, 0, 7,
0, 15, 7, 4, 14, 2, 13, 1, 10, 6, 12, 11, 9, 5, 3, 8,
4, 1, 14, 8, 13, 6, 2, 11, 15, 12, 9, 7, 3, 10, 5, 0,
15, 12, 8, 2, 4, 9, 1, 7, 5, 11, 3, 14, 10, 0, 6, 13],
[15, 1, 8, 14, 6, 11, 3, 4, 9, 7, 2, 13, 12, 0, 5, 10,
3, 13, 4, 7, 15, 2, 8, 14, 12, 0, 1, 10, 6, 9, 11, 5,
0, 14, 7, 11, 10, 4, 13, 1, 5, 8, 12, 6, 9, 3, 2, 15,
13, 8, 10, 1, 3, 15, 4, 2, 11, 6, 7, 12, 0, 5, 14, 9],
[10, 0, 9, 14, 6, 3, 15, 5, 1, 13, 12, 7, 11, 4, 2, 8,
13, 7, 0, 9, 3, 4, 6, 10, 2, 8, 5, 14, 12, 11, 15, 1,
13, 6, 4, 9, 8, 15, 3, 0, 11, 1, 2, 12, 5, 10, 14, 7,
1, 10, 13, 0, 6, 9, 8, 7, 4, 15, 14, 3, 11, 5, 2, 12],
[7, 13, 14, 3, 0, 6, 9, 10, 1, 2, 8, 5, 11, 12, 4, 15,
13, 8, 11, 5, 6, 15, 0, 3, 4, 7, 2, 12, 1, 10, 14, 9,
10, 6, 9, 0, 12, 11, 7, 13, 15, 1, 3, 14, 5, 2, 8, 4,
3, 15, 0, 6, 10, 1, 13, 8, 9, 4, 5, 11, 12, 7, 2, 14],
[2, 12, 4, 1, 7, 10, 11, 6, 8, 5, 3, 15, 13, 0, 14, 9,
14, 11, 2, 12, 4, 7, 13, 1, 5, 0, 15, 10, 3, 9, 8, 6,
4, 2, 1, 11, 10, 13, 7, 8, 15, 9, 12, 5, 6, 3, 0, 14,
11, 8, 12, 7, 1, 14, 2, 13, 6, 15, 0, 9, 10, 4, 5, 3],
[12, 1, 10, 15, 9, 2, 6, 8, 0, 13, 3, 4, 14, 7, 5, 11,
10, 15, 4, 2, 7, 12, 9, 5, 6, 1, 13, 14, 0, 11, 3, 8,
9, 14, 15, 5, 2, 8, 12, 3, 7, 0, 4, 10, 1, 13, 11, 6,
4, 3, 2, 12, 9, 5, 15, 10, 11, 14, 1, 7, 6, 0, 8, 13],
[4, 11, 2, 14, 15, 0, 8, 13, 3, 12, 9, 7, 5, 10, 6, 1,
13, 0, 11, 7, 4, 9, 1, 10, 14, 3, 5, 12, 2, 15, 8, 6,
1, 4, 11, 13, 12, 3, 7, 14, 10, 15, 6, 8, 0, 5, 9, 2,
6, 11, 13, 8, 1, 4, 10, 7, 9, 5, 0, 15, 14, 2, 3, 12],
[13, 2, 8, 4, 6, 15, 11, 1, 10, 9, 3, 14, 5, 0, 12, 7,
1, 15, 13, 8, 10, 3, 7, 4, 12, 5, 6, 11, 0, 14, 9, 2,
7, 11, 4, 1, 9, 12, 14, 2, 0, 6, 10, 13, 15, 3, 5, 8,
2, 1, 14, 7, 4, 10, 8, 13, 15, 12, 9, 0, 3, 5, 6, 11],
]
# 子密钥置换PC2
KEY_TABLE = [14, 17, 11, 24, 1, 5, 3, 28,
15, 6, 21, 10, 23, 19, 12, 4,
26, 8, 16, 7, 27, 20, 13, 2,
41, 52, 31, 37, 47, 55, 30, 40,
51, 45, 33, 48, 44, 49, 39, 56,
34, 53, 46, 42, 50, 36, 29, 32]
# 子密钥循环左移
MOVE_TABLE = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
def process_bt(temp_bt, first_key_bt, second_key_bt, third_key_bt):
for i in range(len(first_key_bt)):
temp_bt = enc(temp_bt, first_key_bt[i])
for i in range(len(second_key_bt)):
temp_bt = enc(temp_bt, second_key_bt[i])
for i in range(len(third_key_bt)):
temp_bt = enc(temp_bt, third_key_bt[i])
return temp_bt
def raw_str_enc(data, first_key="1", second_key="2", third_key="3"):
length = len(data)
enc_data = ""
first_key_bt = get_key_bytes(first_key)
second_key_bt = get_key_bytes(second_key)
third_key_bt = get_key_bytes(third_key)
if length > 0:
if length < 4:
enc_data = bt64_to_hex(process_bt(str_to_bt(data), first_key_bt, second_key_bt, third_key_bt))
else:
iterator = int(length / 4)
remainder = length % 4
for i in range(iterator):
enc_data = enc_data + bt64_to_hex(
process_bt(str_to_bt(data[i * 4:i * 4 + 4]), first_key_bt, second_key_bt, third_key_bt))
if remainder > 0:
enc_data += bt64_to_hex(
process_bt(str_to_bt(data[iterator * 4 + 0:length]), first_key_bt, second_key_bt, third_key_bt))
return enc_data
def get_key_bytes(key):
key_bytes = []
length = len(key)
iterator = int(length / 4)
remainder = length % 4
for i in range(iterator):
key_bytes.append(str_to_bt(key[i * 4:i * 4 + 4]))
if remainder > 0:
key_bytes.append(str_to_bt(key[(iterator - 1) * 4:length]))
return key_bytes
def str_to_bt(input_str):
length = len(input_str)
bt = [0 for _ in range(64)]
if length < 4:
for i in range(length):
k = ord(str(input_str[i]))
for j in range(16):
bt[16 * i + j] = int(k / (2 ** (15 - j))) % 2
for p in range(length, 4):
k = 0
for q in range(16):
bt[16 * p + q] = int(k / (2 ** (15 - q))) % 2
else:
for i in range(4):
k = ord(str(input_str[i]))
for j in range(16):
bt[16 * i + j] = int(k / (2 ** (15 - j))) % 2
return bt
def bt64_to_hex(byte_data):
hex_result = ""
for i in range(16):
bt = ""
for j in range(4):
bt = bt + byte_data[i * 4 + j]
hex_result = hex_result + bt4_to_hex(bt)
return hex_result
def bt4_to_hex(bt):
return str(hex(int(bt, 2)))[2:].upper()
def process_change(bin_str, table):
res = ""
for i in table:
res += str(bin_str[i - 1])
return res
def str_xor(my_str1, my_str2):
res = ""
for i in range(0, len(my_str1)):
xor_res = int(my_str1[i], 10) ^ int(my_str2[i], 10)
if xor_res == 1:
res += '1'
if xor_res == 0:
res += '0'
return res
def s_box(my_str):
res = ""
c = 0
for i in range(0, len(my_str), 6):
now_str = my_str[i:i + 6]
row = int(now_str[0] + now_str[5], 2)
col = int(now_str[1:5], 2)
num = bin(S_BOX_TABLE[c][row * 16 + col])[2:]
for gz in range(0, 4 - len(num)):
num = '0' + num
res += num
c += 1
return res
def gen_key(key_byte):
key = [0 for _ in range(56)]
keys = [[] for _ in range(16)]
for i in range(7):
j = 0
k = 7
while True:
if j >= 8:
break
key[i * 8 + j] = key_byte[8 * k + i]
j = j + 1
k = k - 1
for i in range(16):
for j in range(MOVE_TABLE[i]):
temp_left = key[0]
temp_right = key[28]
for k in range(27):
key[k] = key[k + 1]
key[28 + k] = key[29 + k]
key[27] = temp_left
key[55] = temp_right
temp_key = process_change(key, KEY_TABLE)
keys[i] = temp_key
return keys
def enc(bin_message, bin_key):
ip = process_change(bin_message, IP_TABLE)
keys = gen_key(bin_key)
ip_left = ip[0:32]
ip_right = ip[32:]
for i in range(16):
temp_left = ip_left
ip_left = ip_right
key = keys[i]
temp_e = process_change(ip_right, E_TABLE)
temp_xor1 = str_xor(temp_e, key)
temp_s_box = s_box(temp_xor1)
temp_p_box = process_change(temp_s_box, P_BOX_TABLE)
temp_xor2 = str_xor(temp_p_box, temp_left)
ip_right = temp_xor2
return process_change(ip_right + ip_left, IPR_Table)