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DES.py
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DES.py
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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]
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]
IP = [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]
E = [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]
S = [
[[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],
]
]
P = [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]
IP_1 = [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]
def printkey(lhs, key, sp):
res = ""
for i in range(0, len(key)):
res += key[i]
if (i + 1) % sp == 0:
res += " "
print(lhs + " = " + res)
def generate_from_table(key, table):
new_key = ""
for i in range(0, len(table)):
new_key += key[table[i] - 1]
return new_key
def generate_block_pairs(key):
shift = [1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1]
C = key[:int(len(key)/2)]
D = key[int(len(key)/2):]
key_list = []
for i in range(0, 16):
for j in range(0, shift[i]):
C += C[0]
C = C[1:len(C)]
D += D[0]
D = D[1:len(D)]
print("C" + str(i+1) + " = " + C)
print("D" + str(i+1) + " = " + D + "\n")
key_list.append(C + D)
return key_list
def generate_subkeys(key_list):
for i in range(0, len(key_list)):
key_list[i] = generate_from_table(key_list[i], PC2)
print("K%.2d = %s" % (i+1, key_list[i]))
def XOR(x, y):
res = ""
for i in range(0, len(x)):
if x[i] == y[i]:
res += '0'
else:
res += '1'
return res
def f(key, block):
block_expanded = generate_from_table(block, E)
# print("E bit %s" % block_expanded)
xor_res = ""
xor_res = XOR(key, block_expanded)
printkey("XOR" , xor_res, 6)
sbox_ind = 0
row = 0
col = 0
ind = 0
b = ""
res = ""
for i in range(0, len(xor_res)):
b += xor_res[i]
sbox_ind += (i and i % 6 == 0);
if len(b) % 6 == 0:
row = int(b[0] + b[len(b)-1], 2)
col = int(b[1:len(b)-1], 2)
sbox_res = bin(S[sbox_ind][row][col])[2:]
res += "0"*(4-len(sbox_res)) + sbox_res
b = ""
printkey("f", res, 4)
res = generate_from_table(res, P)
return res
def encrypt(dat, key_list):
L = dat[:int(len(dat)/2)]
R = dat[int(len(dat)/2):]
new_L = ""
new_R = ""
for i in range(0, 16):
print("Round %d:" % (i + 1))
new_L = R
new_R = XOR(L, f(key_list[i], R))
L = new_L
R = new_R
# print("\nL = %s\nR = %s" % (L, R))
printkey("L", L, 4)
printkey("R", R, 4)
# printkey("p_1 = ", generate_from_table(R+L, IP_1), 8)
return generate_from_table(R+L, IP_1)
def hex_to_bin(hex):
res = ""
for i in range(0, len(hex)):
s = bin(int(hex[i], 16))[2:]
res += "0"*(4-len(s)) + s
return res
def bin_to_hex(bin):
res = ""
i = 0
while i < len(bin):
res += hex(int(bin[i:i+4], 2))[2:]
# print(len(hex(int(bin[i:i+4], 2))[2:]))
i += 4
res = res.upper()
return res
hex_key = input("Enter encryption key in Hex: ")
key = hex_to_bin(hex_key)
printkey("Binary key", key, 8)
print("Generating PC-1 permutation for the key...")
key = generate_from_table(key, PC1)
printkey("PC-1 permutation of the key", key, 8)
print("Generating block pairs..")
key_list = generate_block_pairs(key)
print("Generating subkeys..")
generate_subkeys(key_list)
hex_dat = input("Enter your message (in hex) to encrypt: ")
dat = hex_to_bin(hex_dat)
print("\n\nApplying initial permutation to the 64-bit message..")
dat = generate_from_table(dat, IP)
printkey("Initial permutation of data", dat, 8)
print("Encrypting data...")
cipher = encrypt(dat, key_list)
printkey("Cipher Data (Binary)", cipher, 8)
cipher = bin_to_hex(cipher)
print("Cipher Data(Hex) = %s" % cipher)
# k = 133457799BBCDFF1
# m = 0123456789ABCDEF