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DES.py
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# -*- coding: utf-8 -*-
# -*- auther: YaoShiYu -*-
#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
_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]
#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
]
#压缩置换表1，不考虑每字节的第8位，将64位密钥减至56位。然后进行一次密钥置换。
yasuo1_table=[ 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
]
#压缩置换表2，用于将循环左移和右移后的56bit密钥压缩为48bit
yasuo2_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
]
#d = ( 1, 1, 2, 2, 2, 2, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1)
#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
]
# 将字符转换为对应的Unicode码，中文用2个字节表示
def char2unicode_ascii(intext, length):
outtext = []
for i in range(length):
outtext.append(ord(intext[i]))
return outtext
# 将Unicode码转为bit
def unicode2bit(intext, length):
outbit = []
for i in range(length * 16):
outbit.append((intext[int(i / 16)] >> (i % 16)) & 1) # 一次左移一bit
return outbit
# 将8位ASCII码转为bit
def byte2bit(inchar, length):
outbit = []
for i in range(length * 8):
outbit.append((inchar[int(i / 8)] >> (i % 8)) & 1) # 一次左移一bit
return outbit
# 将bit转为Unicode码
def bit2unicode(inbit, length):
out = []
temp = 0
for i in range(length):
temp = temp | (inbit[i] << (i % 16))
if i % 16 == 15:
out.append(temp)
temp = 0
return out
# 将bit转为ascii 码
def bit2byte(inbit, length):
out = []
temp = 0
for i in range(length):
temp = temp | (inbit[i] << (i % 8))
if i % 8 == 7:
out.append(temp)
temp = 0
return out
# 将unicode码转为字符（中文或英文）
def unicode2char(inbyte, length):
out = ""
for i in range(length):
out = out + chr(inbyte[i])
return out
# 生成每一轮的key
def createKeys(inkeys):
keyResult = []
asciikey = char2unicode_ascii(inkeys, len(inkeys))
keyinit = byte2bit(asciikey, len(asciikey))
# 初始化列表key0,key1
key0 = [0 for i in range(56)]
key1 = [0 for i in range(48)]
# 进行密码压缩置换1，将64位密码压缩为56位
for i in range(56):
key0[i] = keyinit[yasuo1_table[i] - 1]
# 进行16轮的密码生成
for i in range(16):
# ---------确定左移的次数----------
if (i == 0 or i == 1 or i == 8 or i == 15): #压缩表左移1
moveStep = 1
else:
moveStep = 2 #压缩表左移2
# --------分两部分，每28bit位一部分，进行循环左移------------
for j in range(moveStep):
for k in range(8):
temp = key0[k * 7]
for m in range(7 * k, 7 * k + 6):
key0[m] = key0[m + 1]
key0[k * 7 + 6] = temp
temp = key0[0]
for k in range(27):
key0[k] = key0[k + 1]
key0[27] = temp
temp = key0[28]
for k in range(28, 55):
key0[k] = key0[k + 1]
key0[55] = temp
# ------------对56位密钥进行压缩置换，压缩为48位-------------
for k in range(48):
key1[k] = key0[yasuo2_table[k] - 1]
keyResult.extend(key1)
return keyResult
def DES(text, key, optionType):
keyResult = createKeys(key)
finalTextOfBit = [0 for i in range(64)]
finalTextOfUnicode = [0 for i in range(4)]
if optionType == 0: # 选择的操作类型为加密
tempText = [0 for i in range(64)] # 用于临时盛放IP逆置换之前，将L部分和R部分合并成64位的结果
extendR = [0 for i in range(48)] # 用于盛放R部分的扩展结果
unicodeText = char2unicode_ascii(text, len(text))
bitText = unicode2bit(unicodeText, len(unicodeText))
initTrans = [0 for i in range(64)] # 初始化，用于存放IP置换后的结果
# ------------------进行初始IP置换---------------
for i in range(64):
initTrans[i] = bitText[IP_table[i] - 1]
# 将64位明文分为左右两部分
L = [initTrans[i] for i in range(32)]
R = [initTrans[i] for i in range(32, 64)]
# 开始进行16轮运算
for i in range(16):
tempR = R # 用于临时盛放R
# -----------进行扩展，将32位扩展为48位--------
for j in range(48):
extendR[j] = R[extend_table[j] - 1]
keyi = [keyResult[j] for j in range(i * 48, i * 48 + 48)]
# ----------与key值进行异或运算----------------
XORResult = [0 for j in range(48)]
for j in range(48):
if keyi[j] != extendR[j]:
XORResult[j] = 1
SResult = [0 for k in range(32)]
# ---------开始进行S盒替换-------------------
for k in range(8):
row = XORResult[k * 6] * 2 + XORResult[k * 6 + 5]
column = XORResult[k * 6 + 1] * 8 + XORResult[k * 6 + 2] * 4 + XORResult[k * 6 + 3] * 2 + XORResult[
k * 6 + 4]
temp = S[k][row * 16 + column]
for m in range(4):
SResult[k * 4 + m] = (temp >> m) & 1
PResult = [0 for k in range(32)]
# --------------开始进行P盒置换----------------
for k in range(32):
PResult[k] = SResult[P_table[k] - 1]
# --------------与L部分的数据进行异或------------
XORWithL = [0 for k in range(32)]
for k in range(32):
if L[k] != PResult[k]:
XORWithL[k] = 1
# -------------将临时保存的R部分值，即tempR复制给L------
L = tempR
R = XORWithL
# ----交换左右两部分------
L, R = R, L
# -----合并为一部分
tempText = L
tempText.extend(R)
# -----------IP逆置换--------
for k in range(64):
finalTextOfBit[k] = tempText[_IP_table[k] - 1]
finalTextOfUnicode = bit2byte(finalTextOfBit, len(finalTextOfBit))
finalTextOfChar = unicode2char(finalTextOfUnicode, len(finalTextOfUnicode))
return finalTextOfChar
else: # 选择的操作类型为解密
tempText = [0 for i in range(64)] # 用于临时盛放IP逆置换之前，将L部分和R部分合并成64位的结果
extendR = [0 for i in range(48)] # 用于盛放R部分的扩展结果
unicodeText = char2unicode_ascii(text, len(text))
bitText = byte2bit(unicodeText, len(unicodeText))
initTrans = [0 for i in range(64)] # 初始化，用于存放IP置换后的结果
# ------------------进行初始IP置换---------------
for i in range(64):
initTrans[i] = bitText[IP_table[i] - 1]
# 将64位明文分为左右两部分
L = [initTrans[i] for i in range(32)]
R = [initTrans[i] for i in range(32, 64)]
# -----------------开始16轮的循环-----------------
for i in range(15, -1, -1):
tempR = R # 用于临时盛放R
# -----------进行扩展，将32位扩展为48位--------
for j in range(48):
extendR[j] = R[extend_table[j] - 1]
keyi = [keyResult[j] for j in range(i * 48, i * 48 + 48)]
# ----------与key值进行异或运算----------------
XORResult = [0 for j in range(48)]
for j in range(48):
if keyi[j] != extendR[j]:
XORResult[j] = 1
SResult = [0 for k in range(32)]
# ---------开始进行S盒替换-------------------
for k in range(8):
row = XORResult[k * 6] * 2 + XORResult[k * 6 + 5]
column = XORResult[k * 6 + 1] * 8 + XORResult[k * 6 + 2] * 4 + XORResult[k * 6 + 3] * 2 + XORResult[
k * 6 + 4]
temp = S[k][row * 16 + column]
for m in range(4):
SResult[k * 4 + m] = (temp >> m) & 1
PResult = [0 for k in range(32)]
# --------------开始进行P盒置换----------------
for k in range(32):
PResult[k] = SResult[P_table[k] - 1]
# --------------与L部分的数据进行异或------------
XORWithL = [0 for k in range(32)]
for k in range(32):
if L[k] != PResult[k]:
XORWithL[k] = 1
# -------------将临时保存的R部分值，即tempR复制给L------
L = tempR
R = XORWithL
# ----交换左右两部分------
L, R = R, L
# -----合并为一部分
tempText = L
tempText.extend(R)
# -----------IP逆置换--------
for k in range(64):
finalTextOfBit[k] = tempText[_IP_table[k] - 1]
finalTextOfUnicode = bit2unicode(finalTextOfBit, len(finalTextOfBit))
finalTextOfChar = unicode2char(finalTextOfUnicode, len(finalTextOfUnicode))
return finalTextOfChar
if __name__=='__main__':
while(True):
optionType = input("选择操作类型：加密 0，解密 1: ")
while (not (optionType == '0' or optionType == '1')):
print("选择的操作类型只能是0或者是1")
optionType = input("选择操作类型，加密输入0，解密输入1: ")
Result = ""
if optionType == '0':
# ----------若输入文本的长度不是4的整数倍，即不是64字节的整数倍，用空格补全（此处为了加密中文，用的是unicode编码，即用16字节表示一个字符）-------
#f= open('Encrypt.txt', 'r',encoding='utf-8')
#text=f.read()
text = input("输入文本: ")
print(" ".join(["输入的文本是:\n", text]))
length = len(text)
text = text + (length % 4) * " "
length = len(text)
key = input("请输入8位加密密码: ")
while (len(key) != 8):
print("wrong!!请输入8位密码")
key = input("请输入8位加密密码: ")
print("加密后的文本：", end=" ")
for i in range(int(length / 4)):
tempText = [text[j] for j in range(i * 4, i * 4 + 4)]
Result = "".join([Result, DES(tempText, key, int(optionType))])
print(Result)
f=open('Decrypt.txt','w',encoding='utf-8')
f.write(Result)
f.close()
if optionType == '1':
# ----------若输入文本的长度不是8的整数倍，即不是64字节的整数倍，用空格补全（此处解密出来的密文用的是每8bit转换为一个ascii码，所以生成的八位表示的字符）-------
f=open('Decrypt.txt','r',encoding='utf-8')
text=f.read()
length = len(text)
key = input("请输入8位解密密码: ")
while (len(key) != 8):
print("wrong!!请输入8位密码")
key = input("请输入8位解密密码: ")
print("解密后的文本：", end=" ")
for i in range(int(length / 8)):
tempText = [text[j] for j in range(i * 8, i * 8 + 8)]
Result = "".join([Result, DES(tempText, key, int(optionType))])
print(Result)
f.close()
break