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| import base64
FTABLE = (0xa3, 0xd7, 0x09, 0x83, 0xf8, 0x48, 0xf6, 0xf4,
0xb3, 0x21, 0x15, 0x78, 0x99, 0xb1, 0xaf, 0xf9,
0xe7, 0x2d, 0x4d, 0x8a, 0xce, 0x4c, 0xca, 0x2e,
0x52, 0x95, 0xd9, 0x1e, 0x4e, 0x38, 0x44, 0x28,
0x0a, 0xdf, 0x02, 0xa0, 0x17, 0xf1, 0x60, 0x68,
0x12, 0xb7, 0x7a, 0xc3, 0xe9, 0xfa, 0x3d, 0x53,
0x96, 0x84, 0x6b, 0xba, 0xf2, 0x63, 0x9a, 0x19,
0x7c, 0xae, 0xe5, 0xf5, 0xf7, 0x16, 0x6a, 0xa2,
0x39, 0xb6, 0x7b, 0x0f, 0xc1, 0x93, 0x81, 0x1b,
0xee, 0xb4, 0x1a, 0xea, 0xd0, 0x91, 0x2f, 0xb8,
0x55, 0xb9, 0xda, 0x85, 0x3f, 0x41, 0xbf, 0xe0,
0x5a, 0x58, 0x80, 0x5f, 0x66, 0x0b, 0xd8, 0x90,
0x35, 0xd5, 0xc0, 0xa7, 0x33, 0x06, 0x65, 0x69,
0x45, 0x00, 0x94, 0x56, 0x6d, 0x98, 0x9b, 0x76,
0x97, 0xfc, 0xb2, 0xc2, 0xb0, 0xfe, 0xdb, 0x20,
0xe1, 0xeb, 0xd6, 0xe4, 0xdd, 0x47, 0x4a, 0x1d,
0x42, 0xed, 0x9e, 0x6e, 0x49, 0x3c, 0xcd, 0x43,
0x27, 0xd2, 0x07, 0xd4, 0xde, 0xc7, 0x67, 0x18,
0x89, 0xcb, 0x30, 0x1f, 0x8d, 0xc6, 0x8f, 0xaa,
0xc8, 0x74, 0xdc, 0xc9, 0x5d, 0x5c, 0x31, 0xa4,
0x70, 0x88, 0x61, 0x2c, 0x9f, 0x0d, 0x2b, 0x87,
0x50, 0x82, 0x54, 0x64, 0x26, 0x7d, 0x03, 0x40,
0x34, 0x4b, 0x1c, 0x73, 0xd1, 0xc4, 0xfd, 0x3b,
0xcc, 0xfb, 0x7f, 0xab, 0xe6, 0x3e, 0x5b, 0xa5,
0xad, 0x04, 0x23, 0x9c, 0x14, 0x51, 0x22, 0xf0,
0x29, 0x79, 0x71, 0x7e, 0xff, 0x8c, 0x0e, 0xe2,
0x0c, 0xef, 0xbc, 0x72, 0x75, 0x6f, 0x37, 0xa1,
0xec, 0xd3, 0x8e, 0x62, 0x8b, 0x86, 0x10, 0xe8,
0x08, 0x77, 0x11, 0xbe, 0x92, 0x4f, 0x24, 0xc5,
0x32, 0x36, 0x9d, 0xcf, 0xf3, 0xa6, 0xbb, 0xac,
0x5e, 0x6c, 0xa9, 0x13, 0x57, 0x25, 0xb5, 0xe3,
0xbd, 0xa8, 0x3a, 0x01, 0x05, 0x59, 0x2a, 0x46)
def g(key, k, w):
g1 = 0xFF & (w >> 8)
g2 = 0xFF & w
g3 = FTABLE[g2 ^ key[(4 * k + 0) % 10]] ^ g1
g4 = FTABLE[g3 ^ key[(4 * k + 1) % 10]] ^ g2
g5 = FTABLE[g4 ^ key[(4 * k + 2) % 10]] ^ g3
g6 = FTABLE[g5 ^ key[(4 * k + 3) % 10]] ^ g4
return ((g5 << 8) + g6)
def ginv(key, k, w):
g5 = 0xFF & (w >> 8)
g6 = 0xFF & w
g4 = FTABLE[g5 ^ key[(4 * k + 3) % 10]] ^ g6
g3 = FTABLE[g4 ^ key[(4 * k + 2) % 10]] ^ g5
g2 = FTABLE[g3 ^ key[(4 * k + 1) % 10]] ^ g4
g1 = FTABLE[g2 ^ key[(4 * k + 0) % 10]] ^ g3
return ((g1 << 8) + g2)
def skip(key, buf, encrypt):
w1 = (buf[0] << 8) + buf[1]
w2 = (buf[2] << 8) + buf[3]
w3 = (buf[4] << 8) + buf[5]
w4 = (buf[6] << 8) + buf[7]
if encrypt:
k, step = 0, 1
for t in range(2):
for i in range(8):
gw1 = g(key, k, w1)
w1, w2, w3, w4 = gw1 ^ w4 ^ (k + step), gw1, w2, w3
k += step
for i in range(8):
gw1 = g(key, k, w1)
w1, w2, w3, w4 = w4, gw1, w1 ^ w2 ^ (k + step), w3
k += step
else:
k, step = 32, -1
for t in range(2):
for i in range(8):
gw2 = ginv(key, k + step, w2)
w1, w2, w3, w4 = gw2, gw2 ^ w3 ^ k, w4, w1
k += step
for i in range(8):
w1, w2, w3, w4 = ginv(key, k + step, w2), w3, w4, w1 ^ w2 ^ k
k += step
return bytes((w1 >> 8, w1 & 0xFF, w2 >> 8, w2 & 0xFF,
w3 >> 8, w3 & 0xFF, w4 >> 8, w4 & 0xFF))
class Skipjack:
def __init__(self, key):
if len(key) != 10:
raise ValueError("key must be 10 bytes in length")
else:
self._key = bytearray(key, 'utf-8')
def encrypt(self, value):
pad = bytearray(8 - len(value))
buf = bytearray(value, 'utf-8') + pad
enc = skip(self._key, buf, True)
print(enc)
return enc
def decrypt(self, value):
pad = bytearray(8 - len(value))
buf = value + pad
dec = skip(self._key, buf, False)
return dec
enc = 'xmxO93Sn8YjfoWqaFS6poLf6n1q7bWrIyXbLAdcSjygWfs/jAVc4leFrTDZYdFoL'
enc = base64.b64decode(enc)
enc1 = [int.from_bytes(enc[i*8:i*8+8], 'little') for i in range(len(enc)//8)]
enc1 = [bytes(enc[i*8:i*8+8]) for i in range(len(enc)//8)]
CT = 0x33221100ddccbbaa
KEY = [ord(i) for i in "NITORI2413"]
sj = Skipjack("NITORI2413")
for i in enc1:
m = sj.decrypt(i)
print(m.decode(), end='')
|
