NEKO

Python实现AES_128_CBC&OFB

2017/12/15

Python3:

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import time
#S盒
S= [0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16]
#逆S盒
_S=[0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e, 0x81, 0xf3, 0xd7, 0xfb,
0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87, 0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb,
0x54, 0x7b, 0x94, 0x32, 0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49, 0x6d, 0x8b, 0xd1, 0x25,
0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16, 0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92,
0x6c, 0x70, 0x48, 0x50, 0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05, 0xb8, 0xb3, 0x45, 0x06,
0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02, 0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b,
0x3a, 0x91, 0x11, 0x41, 0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8, 0x1c, 0x75, 0xdf, 0x6e,
0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89, 0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b,
0xfc, 0x56, 0x3e, 0x4b, 0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59, 0x27, 0x80, 0xec, 0x5f,
0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d, 0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef,
0xa0, 0xe0, 0x3b, 0x4d, 0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d]
#轮常量Rcon
Rcon={1:0x01000000,2:0x02000000,3:0x04000000,4:0x08000000,5:0x10000000,
6:0x20000000,7:0x40000000,8:0x80000000,9:0x1B000000,10:0x36000000}

#T函数
def T(w,index):
temp=''
stemp=''
for i in range(2,len(w),2):
temp+=w[i:i+2]
temp+=w[:2]

for i in range(0,len(temp),2): #S盒变换
stemp+=hex(S[int(temp[i:i+2][0],16)*16+int(temp[i:i+2][1],16)])[2:]
result=hex(int(stemp,16)^Rcon[index])[2:]
return result

#扩展密钥
def ExtendKey(temp):
key=[[],[],[],[]] #密钥的状态矩阵
W=[0 for i in range(44)]
for i in range(4):
for j in range(4):
key[i].append(hex(ord(temp[4*i+j]))[2:])
w=''
for k in key[i]:
while len(k)!=2:
k='0'+k
w+=k
W[i]=w


for i in range(4,44): #生成10轮加密运算中使用的密钥
if i%4==0:
m=hex(int(W[i-4],16)^int(T(W[i-1],int(i/4)),16))[2:]
while len(m)!=8:
m='0'+m
W[i]=m
else:
m=hex(int(W[i-1],16)^int(W[i-4],16))[2:]
while len(m)!=8:
m='0'+m
W[i]=m
return W

#字符串转矩阵
def Str2Matrix(string):
result=[[],[],[],[]]
for i in range(4):
for j in range(4):
m=hex(ord(string[4*i+j]))[2:]
while len(m)!=2:
m='0'+m
result[i].append(m)
return result

#矩阵转字符串
def Matrix2Str(Matrix):
result=''
for i in Matrix:
for j in i:
result+=chr(int(j,16))
return result

#轮密钥加
def LoopKeyAdd(Matrix,W,index):
result=[[],[],[],[]]
for i in range(4):
for j in range(4):
m=hex(int(Matrix[i][j],16)^int(W[index+i][2*j:2*j+2],16))[2:]
while len(m)!=2:
m='0'+m
result[i].append(m)
return result
# print(result)

#S盒变换
def Sconvert(tempMatrix):
result=[[],[],[],[]]
for i in range(4):
for j in range(4):
m=hex(S[int(tempMatrix[i][j][0],16)*16+int(tempMatrix[i][j][1],16)])[2:]
while len(m)!=2:
m='0'+m
result[i].append(m)
return result

#逆S盒变换r
def _Sconvert(_rowMatrix):
result = [[], [], [], []]
for i in range(4):
for j in range(4):
m = hex(_S[int(_rowMatrix[i][j][0], 16) * 16 + int(_rowMatrix[i][j][1], 16)])[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
return result

#行移位
def RowMove(SMatrix):
result = [[], [], [], []]
for i in range(4):
for j in range(4):
result[j].append(SMatrix[(j+i)%4][i])
return result

#逆行移位
def _RowMove(tempMatrix):
result = [[], [], [], []]
for i in range(4):
for j in range(4):
result[j].append(tempMatrix[(j - i) % 4][i])
return result

#GF(2^8)中的乘0x2操作
def G2(x):
b7 = x << 1 & 0b100000000
Xmove = x << 1 & 0b011111111
# Xbin=bin(Xmove)
# print(Xbin)
if b7 == 0:
return Xmove
else:
return Xmove ^ 0b11011
#GF(2^8)中的乘0x4操作
def G4(x):
return G2(G2(x))
#GF(2^8)中的乘0x8操作
def G8(x):
return G2(G2(G2(x)))
#GF(2^8)中的运算操作
def G(x, y):
x = int(x, 16)
if y == 1:
return x
elif y == 2:
return G2(x)
elif y == 3:
return G2(x) ^ x
elif y == 0x9:
return G8(x) ^ x
elif y == 0x0b:
return G8(x) ^ G2(x) ^ x
elif y == 0x0d:
return G8(x) ^ G4(x) ^ x
elif y == 0x0E:
return G8(x) ^ G4(x) ^ G2(x)

#列混淆
def ColumnMix(RowMatrix):
result = [[], [], [], []]
for i in range(4):
m = hex(G(RowMatrix[i][0], 2) ^ G(RowMatrix[i][1], 3) ^ G(RowMatrix[i][2], 1) ^ G(RowMatrix[i][3], 1))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(RowMatrix[i][0], 1) ^ G(RowMatrix[i][1], 2) ^ G(RowMatrix[i][2], 3) ^ G(RowMatrix[i][3], 1))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(RowMatrix[i][0], 1) ^ G(RowMatrix[i][1], 1) ^ G(RowMatrix[i][2], 2) ^ G(RowMatrix[i][3], 3))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(RowMatrix[i][0], 3) ^ G(RowMatrix[i][1], 1) ^ G(RowMatrix[i][2], 1) ^ G(RowMatrix[i][3], 2))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
return result

#逆列混淆
def _ColumnMix(keyaddMatrix):
result = [[], [], [], []]
for i in range(4):
m = hex(G(keyaddMatrix[i][0], 0x0e) ^ G(keyaddMatrix[i][1], 0x0b) ^ G(keyaddMatrix[i][2], 0x0d) ^ G(keyaddMatrix[i][3], 0x09))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(keyaddMatrix[i][0], 0x09) ^ G(keyaddMatrix[i][1], 0x0e) ^ G(keyaddMatrix[i][2], 0x0b) ^ G(keyaddMatrix[i][3], 0x0d))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(keyaddMatrix[i][0], 0x0d) ^ G(keyaddMatrix[i][1], 0x09) ^ G(keyaddMatrix[i][2], 0x0e) ^ G(keyaddMatrix[i][3], 0x0b))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
for i in range(4):
m = hex(G(keyaddMatrix[i][0], 0x0b) ^ G(keyaddMatrix[i][1], 0x0d) ^ G(keyaddMatrix[i][2], 0x09) ^ G(keyaddMatrix[i][3], 0x0e))[2:]
while len(m) != 2:
m = '0' + m
result[i].append(m)
return result

#AES单组加密
def AESEncode(plain,key):
W=ExtendKey(key) #44组子秘钥

plainMatrix=Str2Matrix(plain) #明文矩阵
tempMatrix=LoopKeyAdd(plainMatrix,W,0) #最初的轮密钥加
for i in range(1,11):
SMatrix=Sconvert(tempMatrix) #字节代换
RowMatrix=RowMove(SMatrix) #行移位
if i !=10: #最后一轮不进行列混淆
MixMatrix=ColumnMix(RowMatrix) #列混淆
tempMatrix=LoopKeyAdd(MixMatrix,W,i*4) #轮密钥加
else:
tempMatrix = LoopKeyAdd(RowMatrix, W, i * 4) # 轮密钥加
cipher=Matrix2Str(tempMatrix) #矩阵转字符串
return cipher

#AES单组解密
def AESDecode(cipher,key):
W = ExtendKey(key) # 44组子秘钥
cipherMatrix = Str2Matrix(cipher)
tempMatrix=LoopKeyAdd(cipherMatrix,W,40) #最初的轮密钥加
for i in range(1,11):
_RowMatrix=_RowMove(tempMatrix) #逆行移位
_SMatrix = _Sconvert(_RowMatrix) #逆字节变换
keyaddMatrix=LoopKeyAdd(_SMatrix,W,40-i*4) #轮密钥加
if i != 10: #最后一轮不进行列混淆
tempMatrix=_ColumnMix(keyaddMatrix)
plain=Matrix2Str(keyaddMatrix) #矩阵转字符串
return plain

#AES_128_CBC_Encode
def AES_CBC_Encode():
filename=input('请输入要加密的文件名:\n')
key=input('请输入AES的16字节密钥:\n')
while len(key)!=16:
key = input('注意!请输入AES的16字节密钥:\n')
IV=input('请输入CBC加密模式的16字节初始向量:\n')
while len(IV)!=16:
IV=input('注意!请输入CBC加密模式的16字节初始向量:\n')
print('加密中,wait...\n')
stime=time.time()

plain = open(filename, 'rb').read().decode()
result=''
while len(plain)%16!=0:
plain+=' '
for i in range(0,len(plain),16):
middlecipher = ''
m=plain[i:i+16]
IVList = [ord(j) for j in IV]
PlainList=[ord(j) for j in m]
for iv,p in zip(IVList,PlainList):
middlecipher+=chr(p^iv) #明文与IV异或得到middlecipher
cipher=AESEncode(middlecipher,key) #AES加密
result+=cipher
IV=cipher #更新IV

f = open('AES_CBC_cipher.txt', 'wb')
f.write(result.encode('utf-8'))
f.close()
etime = time.time()
print('密文存储在AES_CBC_cipher.txt中\n')
print('总耗时%d秒\n' % (etime - stime))
#AES_128_CBC_Decode
def AES_CBC_Decode():
result = ''
filename = input('请输入要解密的文件名:\n')
key = input('请输入AES的16字节密钥:\n')
while len(key) != 16:
key = input('注意!请输入AES的16字节密钥:\n')
IV = input('请输入CBC加密模式的16字节初始向量:\n')
while len(IV) != 16:
IV = input('注意!请输入CBC加密模式的16字节初始向量:\n')

print('解密中,wait...\n')
stime = time.time()
cipher = open(filename, 'rb').read().decode()

for i in range(0,len(cipher),16):
plain = ''
c=cipher[i:i+16]
IVList = [ord(j) for j in IV]
middlecipher=AESDecode(c,key) #AES解密得到middlecipher
MiddleList = [ord(j) for j in middlecipher]
for iv,middle in zip(IVList,MiddleList):
plain+=chr(middle^iv) #middlecipher与IV异或得到明文
IV=c
result+=plain

f = open('AES_CBC_plain.txt', 'wb')
f.write(result.encode('utf-8'))
f.close()
etime = time.time()
print('明文存储在AES_CBC_plain.txt中\n')
print('总耗时%d秒\n' % (etime - stime))
#AES_128_OFB_Encode
def AES_OFB_Encode():
filename = input('请输入要加密的文件名:\n')
key = input('请输入AES的16字节密钥:\n')
while len(key) != 16:
key = input('注意!请输入AES的16字节密钥:\n')
IV = input('请输入OFB加密模式的16字节初始向量:\n')
while len(IV) != 16:
IV = input('注意!请输入OFB加密模式的16字节初始向量:\n')

print('加密中,wait...\n')
stime = time.time()
plain = open(filename, 'rb').read().decode()

result = ''
while len(plain)%8!=0: #取n为8字节,即寄存器一次丢一半,确定明文长度为8的倍数
plain+=' '
for i in range(0,len(plain),8):
cipher=''
m = plain[i:i + 8]
LFSR=AESEncode(IV,key)
LFSRList=[ord(j) for j in LFSR[:8]]
PlainList=[ord(j) for j in m]
for l,p in zip(LFSRList,PlainList):
cipher+=chr(l^p)
result+=cipher
IV=IV[8:]+LFSR[:8] #寄存器左移8字节

f = open('AES_OFB_cipher.txt', 'wb')
f.write(result.encode('utf-8'))
f.close()
etime = time.time()
print('密文存储在AES_OFB_cipher.txt中\n')
print('总耗时%d秒\n' % (etime - stime))
#AES_128_OFB_Decode
def AES_OFB_Decode():
result = ''
filename = input('请输入要解密的文件名:\n')
key = input('请输入AES的16字节密钥:\n')
while len(key) != 16:
key = input('注意!请输入AES的16字节密钥:\n')
IV = input('请输入OFB加密模式的16字节初始向量:\n')
while len(IV) != 16:
IV = input('注意!请输入OFB加密模式的16字节初始向量:\n')

print('解密中,wait...\n')
stime = time.time()
cipher = open(filename, 'rb').read().decode()

for i in range(0,len(cipher),8):
plain=''
C=cipher[i:i+8]
LFSR = AESEncode(IV, key)
LFSRList = [ord(j) for j in LFSR[:8]]
CipherList = [ord(j) for j in C]
for l,c in zip(LFSRList,CipherList):
plain+=chr(l^c)
result+=plain
IV=IV[8:]+LFSR[:8]

f = open('AES_OFB_plain.txt', 'wb')
f.write(result.encode('utf-8'))
f.close()
etime = time.time()
print('明文存储在AES_OFB_plain.txt中\n')
print('总耗时%d秒\n' % (etime - stime))

#key='cumtcumtcumtcumt'
#IV='nekonekonekoneko'
if __name__=="__main__":
choice=input('请输入选择:\n1:AES_128_CBC_ENCODE\n2:AES_128_CBC_DECODE\n'
'3:AES_128_OFB_ENCODE\n4:AES_128_OFB_DECODE\n')
if choice=='1':
AES_CBC_Encode()
elif choice=='2':
AES_CBC_Decode()
elif choice=='3':
AES_OFB_Encode()
elif choice=='4':
AES_OFB_Decode()
else:
print('请输入正确的序号!')




原文作者: n3k0

发表日期: December 15th 2017, 2:04:22

发出嘶吼: 没有魔夜2玩我要死了

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