f函数
# -*- coding = utf-8 -*-
# @Time : 2021/9/22 20:21
# @Author : 刘卓文
# @File : F.py
# @Software : PyCharm
MaxTime = 16
# IP置换表
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IP置换表
Inv_IP_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]
# S盒中的S1盒
S1 = [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]
# S盒中的S2盒
S2 = [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]
# S盒中的S3盒
S3 = [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]
# S盒中的S4盒
S4 = [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]
# S盒中的S5盒
S5 = [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]
# S盒中的S6盒
S6 = [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]
# S盒中的S7盒
S7 = [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]
# S盒中的S8盒
S8 = [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]
# S盒
S = [S1, S2, S3, S4, S5, S6, S7, S8]
# 用于对数据进行扩展置换，将32bit数据扩展为48bit
extend_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_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]
# 轮函数F()
# 32bitR0/L0-->48bitR0/L0 # E扩展置换
# 48bitR0/L0⨁48bitK1 #K1通过密钥生成获得
# 48R0/L0--S盒压缩-->32bitR0/L0
# 32bitR0/L0--P盒置换-->32bitR0/L0
def intiBit(n):
a=[]
for i in range(0,4):
a.insert(0,str(n%2))
n = int(n/2)
return a
def IP(text,op):
tmp = [0 for i in range(64)]
if op == 0:
for i in range(64):
tmp[i] = text[IP_table[i]-1]
return tmp
if op == 1:
for i in range(64):
tmp[i] = text[Inv_IP_table[i]-1]
return tmp
def Ebox(text):
extend = [0 for i in range(48)]
for i in range(48):
extend[i] = text[extend_table[i]-1]
return extend
def Sbox(text):
sResult = [0 for k in range(32)]
for k in range(8):
row = 2*int(text[k*6]) + int(text[k*6+5])
column = 8 * int(text[k * 6 + 1]) + 4 * int(text[k * 6 + 2]) + 2 * int(text[k * 6 + 3]) + int(text[k * 6 + 4])
tmp = S[k][row*16+column]
for i in range(4):
sResult[4*k+i] = intiBit(tmp)[i]
return sResult
def Pbox(text):
pResult = [0 for i in range(32)]
for i in range(32):
pResult[i] = text[P_table[i]-1]
return pResult
def Xor(bit1,bit2):
xResult = [0 for i in range(len(bit1))]
for i in range(len(bit1)):
xResult[i] = str(int(bit1[i]) ^ int(bit2[i]))
return xResult
密钥的生成
# -*- coding = utf-8 -*-
# @Time : 2021/9/22 18:48
# @Author : 刘卓文
# @File : key.py
# @Software : PyCharm
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 ]
#生成子密钥的置换表2，将56位的密钥转换为48位
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 ]
# 将64bit密钥K0根据PC-1表进行置换得到56bit数据
# 将56bit数据分为28bit的C0&D0
# C0&D0根据移位次数表移位得到C1&D1 # 该处位移为2*28bit的循环左移
# C1&D1结果拼接之后的56bit数据根据PC-2表进行置换得到48bit密钥K1
# 重复3-4直到16次 # 每一次的移位都是在上一对C&D的基础上移位
#生成子密钥的置换表1，将64位的密钥转换为56位
#循环左移
def Listmove(l,step):
return l[step:] + l[:step]
def createKey(key):
keyresult = []
key0 = [0 for i in range(56)]
for i in range(len(pc1)):
key0[i] = key[pc1[i]-1]
for i in range(16):
key1 = [0 for i in range(48)]
if(i==0 or i ==1 or i == 8 or i == 15):
step = 1
else:
step = 2
tmp1 = key0[0:28]
tmp2 = key0[28:56]
tmp1 = Listmove(tmp1,step)
tmp2 = Listmove(tmp2,step)
key0 = tmp1 + tmp2
for i in range(len(pc2)):
key1[i] = key0[pc2[i]-1]
keyresult.append(key1)
return keyresult
des加密
import key as cs
import F as f
#十六进制转二进制比特串
def Hexbin(text):
result = []
for i in range(len(text)):
result.extend(f.intiBit(int(text[i],16)))
return result
#二进制比特串转十六进制
def bin2Hex(text):
result = []
q = len(text)//4
for i in range(q):
dec = int(text[4*i])*8 + int(text[4*i+1])*4 + int(text[4*i+2])*2 + int(text[4*i+3])*1
x = hex(dec)[2:].upper()
result.extend(x)
rs = ''.join(result)
return rs
def desEncryption(text,key):
keyList = cs.createKey(keybit)
text1 = f.IP(text,0)
L = [text1[i] for i in range(32)]
R = [text1[i] for i in range(32, 64)]
for i in range(16):
tmp = R
tmp = f.Ebox(tmp)
tmp = f.Xor(tmp,keyList[15-i])
tmp = f.Sbox(tmp)
tmp = f.Pbox(tmp)
tmp = f.Xor(tmp,L)
L = R
R = tmp
L,R = R,L
ctext = L
ctext.extend(R)
ctext = f.IP(ctext,1)
return bin2Hex(ctext)
if __name__ == '__main__':
plaintext = input("请输入用十六进制表示的明文:")
key = input("请输入用十六进制表示的密钥：")
ptext = Hexbin(plaintext)
keybit = Hexbin(key)
print('输出的密文为：' + desEncryption(ptext, keybit))
标签：11,10,13,12,15,14,des,算法 来源： https://www.cnblogs.com/lzwhehe/p/15322568.html
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