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| from bitstring import BitArray
Sbox = (
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,
)
InvSbox = (
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,
)
Rcon = (
0x00, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40,
0x80, 0x1B, 0x36, 0x6C, 0xD8, 0xAB, 0x4D, 0x9A,
0x2F, 0x5E, 0xBC, 0x63, 0xC6, 0x97, 0x35, 0x6A,
0xD4, 0xB3, 0x7D, 0xFA, 0xEF, 0xC5, 0x91, 0x39,
)
def text2bytestr(input: str , fill:str = 'a') ->tuple():
fillnum = 0
while len(input) % 128 != 0:
input += fill
fillnum += 1
res = BitArray()
for char in input:
res.append(BitArray(uint=ord(char) , length= 8))
return (res,fillnum)
def __sbox(input:BitArray)->BitArray:
a = input[:4].uint
b = input[4:].uint
return BitArray(uint = Sbox[16 * a + b] , length= 8)
def keyAddition(roundkey:BitArray , message:BitArray)->BitArray:
return roundkey ^ message
def substitution(btstr:BitArray)->BitArray:
for i in range(0 , 128 , 8):
btstr[i:i+8] = __sbox(btstr[i:i+8])
return btstr
def __byteLevelpermutation(input:BitArray , key:dict)->BitArray:
ls = [input[i:i+8] for i in range(0 , 128 , 8)]
permutated = ls[:]
for origin , after in key.items():
permutated[origin] = ls[after]
return BitArray().join(permutated)
def shiftrow(input:BitArray):
position = {0:0 , 1:5 , 2:10 , 3:15 , 4:4 , 5:9 ,6:14 , 7:3 ,8:8 , 9:13 , 10:2 , 11 :7 , 12 : 12 , 13 :1 , 14 : 6 ,15:11}
return __byteLevelpermutation(input , position)
def __m2(input:BitArray)->BitArray:
return (input << 1 if input.bin[0] == '0' else ((input << 1) ^ BitArray(uint=0b00011011 , length=8)))
def __m3(input:BitArray)->BitArray:
return input ^ __m2(input)
def mixcolumn(input:BitArray)->BitArray:
res = input.copy()
for i in range(0 , 128 , 32):
res[i:i+8] = __m2(input[i:i+8])^__m3(input[i+8:i+16])^input[i+16:i+24]^input[i+24:i+32]
res[i+8:i+16] = (input[i:i+8])^__m2(input[i+8:i+16])^__m3(input[i+16:i+24])^input[i+24:i+32]
res[i+16:i+24] = (input[i:i+8])^(input[i+8:i+16])^__m2(input[i+16:i+24])^__m3(input[i+24:i+32])
res[i+24:i+32] = __m3(input[i:i+8])^(input[i+8:i+16])^input[i+16:i+24]^__m2(input[i+24:i+32])
return res
def __g(lastW:BitArray , roundnumber:int)->BitArray:
res = BitArray()
for i in range(8 , 32 , 8):
res.append(__sbox(lastW[i:i+8]))
res.append(__sbox(lastW[0:8]))
res[0:8] = BitArray(uint=Rcon[roundnumber],length=8) ^ res[0:8]
return res
def KeyGenerator(lastKey:BitArray,roundnumber:int)->BitArray:
nextKey = BitArray()
nextKey.append(__g(lastKey[96:] , roundnumber) ^ lastKey[0:32])
for i in range(0,96,32):
nextKey.append(nextKey[i:i+32] ^ lastKey[i+32:i+64])
return nextKey
def doround(message:BitArray , key:BitArray , roundnumber:int)->tuple:
k = KeyGenerator(key , roundnumber)
m = keyAddition(k , mixcolumn(shiftrow(substitution(message))))
return (m,k)
def lastround(message:BitArray , key:BitArray , roundnumber:int)->tuple:
k = KeyGenerator(key , roundnumber)
m = keyAddition(k , shiftrow(substitution(message)))
return (m,k)
message = [0x32 , 0x43 , 0xf6 , 0xa8 , 0x88 , 0x5a , 0x30 , 0x8d , 0x31 , 0x31 , 0x98 , 0xa2 , 0xe0 , 0x37 , 0x07 , 0x34]
key = [0x2b, 0x7e, 0x15, 0x16, 0x28, 0xae, 0xd2, 0xa6, 0xab, 0xf7, 0x15, 0x88, 0x09, 0xcf, 0x4f, 0x3c]
m = BitArray()
k = BitArray()
for me , ke in zip(message , key):
m.append(BitArray(uint = me , length = 8))
k.append(BitArray(uint = ke , length = 8))
m = keyAddition(m,k)
for i in range(1, 10):
m,k = doround(m,k,i)
m,k=lastround(m,k,10)
print("encrypted message bits :" , m.hex)
print("key used in the last round:" , k.hex)
|