def q_key(k: bytes):
#part 1
left_part = ByteUtils.getLeftPart(k)
sqr_1 = FFunc.f_func(left_part, Key.S_1)
right_part = ByteUtils.xor(sqr_1, ByteUtils.getRightPart(k))
#part 2
left_part, right_part = right_part, left_part
sqr_2 = FFunc.f_func(left_part, Key.S_2)
right_part = ByteUtils.xor(sqr_2, right_part)
#part 3
left_part, right_part = right_part, left_part
part_3_res = ByteUtils.xor(left_part + right_part, k)
#part 4
left_part = ByteUtils.getLeftPart(part_3_res)
right_part = ByteUtils.getRightPart(part_3_res)
sqr_3 = FFunc.f_func(left_part, Key.S_3)
right_part = ByteUtils.xor(sqr_3, right_part)
#part 5
left_part, right_part = right_part, left_part
sqr_4 = FFunc.f_func(left_part, Key.S_4)
right_part = ByteUtils.xor(sqr_4, right_part)
return right_part + left_part
def fl_inv(y: bytes, kl: bytes):
y_l = ByteUtils.getLeftPart(y)
y_r = ByteUtils.getRightPart(y)
kl_l = ByteUtils.getLeftPart(kl)
kl_R = ByteUtils.getRightPart(kl)
sqr_1 = (int.from_bytes(y_r, "little")
| int.from_bytes(kl_R, "little")).to_bytes(4, "little")
sqr_2 = ByteUtils.xor(sqr_1, y_l)
sqr_3 = (int.from_bytes(sqr_2, "little")
& int.from_bytes(kl_l, "little")).to_bytes(4, "little")
sqr_4 = ByteUtils.rol(sqr_3, 1)
sqr_5 = ByteUtils.xor(sqr_4, y_r)
return sqr_2 + sqr_5
def fl_func(x: bytes, kl: bytes):
x_l = ByteUtils.getLeftPart(x)
x_r = ByteUtils.getRightPart(x)
kl_l = ByteUtils.getLeftPart(kl)
kl_r = ByteUtils.getRightPart(kl)
sqr_1 = int(
int.from_bytes(kl_l, "little")
& int.from_bytes(x_l, "little")).to_bytes(4, "little")
sqr_2 = ByteUtils.rol(sqr_1, 1)
sqr_3 = ByteUtils.xor(sqr_2, x_r)
sqr_4 = (int.from_bytes(sqr_3, "little")
| int.from_bytes(kl_r, "little")).to_bytes(4, "little")
sqr_5 = ByteUtils.xor(sqr_4, x_l)
return sqr_5 + sqr_3
def encrypt(x: bytes, key: bytes):
if (len(x) != 16):
raise Exception("entry value should be 16 bytes")
elif (len(key) != 16):
raise Exception("key should be 16 bytes")
Camelia.init_key_k(key)
left = ByteUtils.xor(ByteUtils.getLeftPart(x), Camelia.kw_i[0])
right = ByteUtils.xor(ByteUtils.getRightPart(x), Camelia.kw_i[1])
for i in range(6):
sqr = FFunc.f_func(left, Camelia.k_i[i])
right = ByteUtils.xor(right, sqr)
right, left = left, right
left = FLFunction.fl_func(left, Camelia.kl_i[0])
right = FLFunction.fl_inv(right, Camelia.kl_i[1])
for i in range(6, 12):
sqr = FFunc.f_func(left, Camelia.k_i[i])
right = ByteUtils.xor(right, sqr)
right, left = left, right
left = FLFunction.fl_func(left, Camelia.kl_i[2])
right = FLFunction.fl_inv(right, Camelia.kl_i[3])
for i in range(12, 18):
sqr = FFunc.f_func(left, Camelia.k_i[i])
right = ByteUtils.xor(right, sqr)
right, left = left, right
left, right = ByteUtils.xor(right, Camelia.kw_i[2]), ByteUtils.xor(
left, Camelia.kw_i[3])
return left + right
def init_key_k(key: bytes):
key_q = Key.q_key(key)
Camelia.k_i = [
ByteUtils.getLeftPart(key_q),
ByteUtils.getRightPart(key_q),
ByteUtils.getLeftPart(ByteUtils.rol(key, 15)),
ByteUtils.getRightPart(ByteUtils.rol(key, 15)),
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 15)),
ByteUtils.getRightPart(ByteUtils.rol(key_q, 15)),
ByteUtils.getLeftPart(ByteUtils.rol(key, 45)),
ByteUtils.getRightPart(ByteUtils.rol(key, 45)),
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 45)),
ByteUtils.getRightPart(ByteUtils.rol(key, 60)),
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 60)),
ByteUtils.getRightPart(ByteUtils.rol(key_q, 60)),
ByteUtils.getLeftPart(ByteUtils.rol(key, 94)),
ByteUtils.getRightPart(ByteUtils.rol(key, 94)),
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 94)),
ByteUtils.getRightPart(ByteUtils.rol(key_q, 94)),
ByteUtils.getLeftPart(ByteUtils.rol(key, 111)),
ByteUtils.getRightPart(ByteUtils.rol(key, 111)),
]
Camelia.kl_i = [
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 30)),
ByteUtils.getRightPart(ByteUtils.rol(key_q, 30)),
ByteUtils.getLeftPart(ByteUtils.rol(key, 77)),
ByteUtils.getRightPart(ByteUtils.rol(key, 77)),
]
Camelia.kw_i = [
ByteUtils.getLeftPart(key),
ByteUtils.getRightPart(key),
ByteUtils.getLeftPart(ByteUtils.rol(key_q, 111)),
ByteUtils.getRightPart(ByteUtils.rol(key_q, 111))
]
def test_get_L(self):
self.assertEqual(self.left, ByteUtils.getLeftPart(self.bytes_))