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DES.py
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DES.py
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def he2bin(msg):
hex = {"0": "0000", "1": "0001", "2": "0010", "3": "0011", "4": "0100", "5": "0101", "6": "0110", "7": "0111",
"8": "1000", "9": "1001", "a": "1010", "b": "1011", "c": "1100", "d": "1101", "e": "1110", "f": "1111"}
f = ""
l = len(msg)
for i in range(0, l):
f = f + hex[msg[i]]
# print(f)
return f
def binar2he(msg):
bi = {"0000": "0", "0001": "1", "0010": "2", "0011": "3", "0100": "4", "0101": "5", "0110": "6", "0111": "7",
"1000": "8", "1001": "9", "1010": "a", "1011": "b", "1100": "c", "1101": "d", "1110": "e", "1111": "f"}
f = ""
lis = []
count = 0
l = len(msg)
if l == 64:
for i in range(0, 16):
lis = lis + [msg[count:count + 4]]
f = f + bi[lis[i]]
count = count + 4
elif l == 56:
for i in range(0, 14):
lis = lis + [msg[count:count + 4]]
f = f + bi[lis[i]]
count = count + 4
elif l == 48:
for i in range(0, 12):
lis = lis + [msg[count:count + 4]]
f = f + bi[lis[i]]
count = count + 4
elif l == 32:
for i in range(0, 8):
lis = lis + [msg[count:count + 4]]
f = f + bi[lis[i]]
count = count + 4
# print(lis)
# print(f)
return f
def first_ini(msg):
IPC = [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]
bi = he2bin(msg)
# print(bi)
le = len(IPC)
final_s = ""
# count = 0
for i in range(0, le):
# print(IPC[i]-1)
final_s = final_s + str(bi[IPC[i] - 1])
# print(final_s)
# print(final_s)
h = binar2he(final_s)
print("Initial permutation : - ", h)
return h
def enco(msg):
# r = msg
# print(r)
final_s = msg
# final_s = he2bin(r)
# le = len(final_s)
# print(final_s)
# count = 0
en_tab = [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]
l_f = len(en_tab)
ret = ""
for i in range(0, l_f):
ret = ret + final_s[en_tab[i] - 1]
return ret
def xor(first, second):
fi_s = ""
len1 = len(first)
# print(first)
# print(second)
for i in range(0, len1):
# print(first[i]," ",second[i])
if (first[i] == second[i]):
fi_s = fi_s + '0'
elif (first[i] != second[i]):
fi_s = fi_s + '1'
# print(fi_s)
# print(fi_s)
return fi_s
def round(r):
m = []
if r == 1:
m = [[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]]
elif r == 2:
m = [[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]]
elif r == 3:
m = [[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]]
elif r == 4:
m = [[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]]
elif r == 5:
m = [[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]]
elif r == 6:
m = [[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]]
elif r == 7:
m = [[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]]
elif r == 8:
m = [[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]]
return m
def s_box(x):
he = {"0000": "0", "0001": "1", "0010": "2", "0011": "3", "0100": "4", "0101": "5", "0110": "6", "0111": "7",
"1000": "8", "1001": "9", "1010": "10", "1011": "11", "1100": "12", "1101": "13", "1110": "14", "1111": "15"}
bi = {"0": "0", "1": "1", "2": "2", "3": "3", "4": "4", "5": "5", "6": "6", "7": "7",
"8": "8", "9": "9", "10": "a", "11": "b", "12": "c", "13": "d", "14": "e", "15": "f"}
row = {"00": 0, "01": 1, "10": 2, "11": 3}
# s_li = ['s1','s2','s3','s4','s5','s6','s7','s8']
# lis = [x[0:7],x[7:13],x[13:19],]
count = 0
lis = []
for i in range(0, 8):
lis = lis + [x[count:count + 6]]
count = count + 6
# print(lis)
final_str = ""
ro = 1
for i in range(0, 8):
s = lis[i]
va = s[0] + s[5]
# print(row[va])
m = round(ro)
# print(ind)
index = int(row[va])
# print(index)
val = int(he[s[1:5]])
final_str = final_str + str(bi[str(m[index][val])])
ro = ro + 1
# print(final_str)
return he2bin(final_str)
def aft_s_per(msg):
m = [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]
l = len(m)
final_str = ""
for i in range(0, l):
final_str = final_str + msg[m[i] - 1]
return final_str
def key_perm(msg):
PC1 = [57, 49, 41, 33, 25, 17, 9,
1, 58, 50, 42, 34, 26, 18,
10, 2, 59, 51, 43, 35, 27,
19, 11, 3, 60, 52, 44, 36,
63, 55, 47, 39, 31, 23, 15,
7, 62, 54, 46, 38, 30, 22,
14, 6, 61, 53, 45, 37, 29,
21, 13, 5, 28, 20, 12, 4]
bi = he2bin(msg)
# print(bi)
le = len(PC1)
final_s = ""
# count = 0
for i in range(0, le):
# print(IPC[i]-1)
final_s = final_s + str(bi[PC1[i] - 1])
# print(final_s)
# print(final_s)
h = binar2he(final_s)
# print(h)
return h
def round_key(msg):
round = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
key = key_perm(msg)
# print(key)
key_list = []
key = he2bin(key)
for i in range(0, 16):
final_str = ""
l = ""
r = ""
if round[i] == 1:
l_in = key[0:28]
r_in = key[28:56]
# print(len(l_in)," ",len(r_in))
l = l_in[1:] + l_in[0]
r = r_in[1:] + r_in[0]
final_str = l + r
# print(len(final_str))
key = final_str
key_list = key_list + [binar2he(final_str)]
elif round[i] == 2:
l_in = key[0:28]
r_in = key[28:56]
# print(len(l_in)," ",len(r_in))
l = l_in[2:] + l_in[0] + l_in[1]
r = r_in[2:] + r_in[0] + r_in[1]
final_str = l + r
# print(len(final_str))
key = final_str
key_list = key_list + [binar2he(final_str)]
print(key_list)
return key_list
def key_gen(msg):
PC2 = [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]
bi = he2bin(msg)
# print(bi)
le = len(PC2)
final_s = ""
# count = 0
for i in range(0, le):
# print(IPC[i]-1)
final_s = final_s + str(bi[PC2[i] - 1])
# print(final_s)
# print(final_s)
h = binar2he(final_s)
# print(h)
return h
def final_inv_init(msg):
INV = [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]
bi = he2bin(msg)
# print(bi)
le = len(INV)
final_s = ""
# count = 0
for i in range(0, le):
# print(IPC[i]-1)
final_s = final_s + str(bi[INV[i] - 1])
# print(final_s)
# print(final_s)
h = binar2he(final_s)
# print(h)
return h
def final_main(plain, key):
in1 = he2bin(first_ini(plain))
l_init = in1[0:32]
# print("p : - ",l_init)
r_init = in1[32:64]
final_list = []
key_list = round_key(key)
# print(key_list)
for i in range(0, 16):
# print(key_gen(key_list[i]))
final_key = he2bin(key_gen(key_list[i]))
finsl_str = ""
enc = enco(r_init)
# print(binar2he(enc))
# print(enc)
x = xor(enc, final_key)
# print(final_key)
m = s_box(x)
# print(m)
# print(m)
f = aft_s_per(m)
# print(l_init)
# print(f)
# print("f : - ",f,"l_init : - ",l_init)
c = xor(l_init, f)
# print(c)
finsl_str = r_init + c
l_init = r_init
r_init = c
final_list = final_list + [binar2he(finsl_str)]
#print(final_list)
swap = final_list[len(final_list) - 1]
final_swap = swap[8:16] + swap[0:8]
print(final_inv_init(final_swap))
# main message and key
msg = "123456abcd132536"
key = 'aabb09182736ccdd'
final_main(msg, key)