412 lines
12 KiB
Python
412 lines
12 KiB
Python
from __future__ import annotations
|
|
from Cryptodome import Random
|
|
from librespot import util
|
|
import io
|
|
import re
|
|
import struct
|
|
import typing
|
|
|
|
if typing.TYPE_CHECKING:
|
|
from librespot.core import Session
|
|
|
|
|
|
class CipherPair:
|
|
__receive_cipher: Shannon
|
|
__receive_nonce = 0
|
|
__send_cipher: Shannon
|
|
__send_nonce = 0
|
|
|
|
def __init__(self, send_key: bytes, receive_key: bytes):
|
|
self.__send_cipher = Shannon()
|
|
self.__send_cipher.key(send_key)
|
|
self.__receive_cipher = Shannon()
|
|
self.__receive_cipher.key(receive_key)
|
|
|
|
def send_encoded(self, connection: Session.ConnectionHolder, cmd: bytes,
|
|
payload: bytes) -> None:
|
|
"""
|
|
Send decrypted data to the socket
|
|
:param connection:
|
|
:param cmd:
|
|
:param payload:
|
|
:return:
|
|
"""
|
|
self.__send_cipher.nonce(self.__send_nonce)
|
|
self.__send_nonce += 1
|
|
buffer = io.BytesIO()
|
|
buffer.write(cmd)
|
|
buffer.write(struct.pack(">H", len(payload)))
|
|
buffer.write(payload)
|
|
buffer.seek(0)
|
|
contents = self.__send_cipher.encrypt(buffer.read())
|
|
mac = self.__send_cipher.finish(4)
|
|
connection.write(contents)
|
|
connection.write(mac)
|
|
connection.flush()
|
|
|
|
def receive_encoded(self, connection: Session.ConnectionHolder) -> Packet:
|
|
"""
|
|
Receive and parse decrypted data from the socket
|
|
Args:
|
|
connection: ConnectionHolder
|
|
Return:
|
|
The parsed packet will be returned
|
|
"""
|
|
try:
|
|
self.__receive_cipher.nonce(self.__receive_nonce)
|
|
self.__receive_nonce += 1
|
|
header_bytes = self.__receive_cipher.decrypt(connection.read(3))
|
|
cmd = struct.pack(">s", bytes([header_bytes[0]]))
|
|
payload_length = (header_bytes[1] << 8) | (header_bytes[2] & 0xff)
|
|
payload_bytes = self.__receive_cipher.decrypt(
|
|
connection.read(payload_length))
|
|
mac = connection.read(4)
|
|
expected_mac = self.__receive_cipher.finish(4)
|
|
if mac != expected_mac:
|
|
raise RuntimeError()
|
|
return Packet(cmd, payload_bytes)
|
|
except IndexError:
|
|
raise RuntimeError("Failed to receive packet")
|
|
|
|
|
|
class DiffieHellman:
|
|
"""
|
|
DiffieHellman Keyexchange
|
|
"""
|
|
__prime = int.from_bytes(
|
|
b'\xff\xff\xff\xff\xff\xff\xff\xff\xc9\x0f'
|
|
b'\xda\xa2!h\xc24\xc4\xc6b\x8b\x80\xdc\x1c'
|
|
b'\xd1)\x02N\x08\x8ag\xcct\x02\x0b\xbe\xa6;'
|
|
b'\x13\x9b"QJ\x08y\x8e4\x04\xdd\xef\x95\x19'
|
|
b'\xb3\xcd:C\x1b0+\nm\xf2_\x147O\xe15mmQ\xc2'
|
|
b'E\xe4\x85\xb5vb^~\xc6\xf4LB\xe9\xa6:6 \xff'
|
|
b'\xff\xff\xff\xff\xff\xff\xff',
|
|
byteorder="big")
|
|
__private_key: int
|
|
__public_key: int
|
|
|
|
def __init__(self):
|
|
key_data = Random.get_random_bytes(0x5f)
|
|
self.__private_key = int.from_bytes(key_data, byteorder="big")
|
|
self.__public_key = pow(2, self.__private_key, self.__prime)
|
|
|
|
def compute_shared_key(self, remote_key_bytes: bytes):
|
|
"""
|
|
Compute shared_key
|
|
"""
|
|
remote_key = int.from_bytes(remote_key_bytes, "big")
|
|
return pow(remote_key, self.__private_key, self.__prime)
|
|
|
|
def private_key(self) -> int:
|
|
"""
|
|
Return DiffieHellman's private key
|
|
Returns:
|
|
DiffieHellman's private key
|
|
"""
|
|
return self.__private_key
|
|
|
|
def public_key(self) -> int:
|
|
"""
|
|
Return DiffieHellman's public key
|
|
Returns:
|
|
DiffieHellman's public key
|
|
"""
|
|
return self.__public_key
|
|
|
|
def public_key_bytes(self) -> bytes:
|
|
"""
|
|
Return DiffieHellman's packed public key
|
|
Returns:
|
|
DiffieHellman's packed public key
|
|
"""
|
|
return util.int_to_bytes(self.__public_key)
|
|
|
|
|
|
class Packet:
|
|
cmd: bytes
|
|
payload: bytes
|
|
|
|
def __init__(self, cmd: bytes, payload: bytes):
|
|
self.cmd = cmd
|
|
self.payload = payload
|
|
|
|
def is_cmd(self, cmd: bytes) -> bool:
|
|
return cmd == self.cmd
|
|
|
|
class Type:
|
|
secret_block = b"\x02"
|
|
ping = b"\x04"
|
|
stream_chunk = b"\x08"
|
|
stream_chunk_res = b"\x09"
|
|
channel_error = b"\x0a"
|
|
channel_abort = b"\x0b"
|
|
request_key = b"\x0c"
|
|
aes_key = b"\x0d"
|
|
aes_key_error = b"\x0e"
|
|
image = b"\x19"
|
|
country_code = b"\x1b"
|
|
pong = b"\x49"
|
|
pong_ack = b"\x4a"
|
|
pause = b"\x4b"
|
|
product_info = b"\x50"
|
|
legacy_welcome = b"\x69"
|
|
license_version = b"\x76"
|
|
login = b"\xab"
|
|
ap_welcome = b"\xac"
|
|
auth_failure = b"\xad"
|
|
mercury_req = b"\xb2"
|
|
mercury_sub = b"\xb3"
|
|
mercury_unsub = b"\xb4"
|
|
mercury_event = b"\xb5"
|
|
track_ended_time = b"\x82"
|
|
unknown_data_all_zeros = b"\x1f"
|
|
preferred_locale = b"\x74"
|
|
unknown_0x4f = b"\x4f"
|
|
unknown_0x0f = b"\x0f"
|
|
unknown_0x10 = b"\x10"
|
|
|
|
@staticmethod
|
|
def parse(val: typing.Union[bytes, None]) -> typing.Union[bytes, None]:
|
|
for cmd in [
|
|
Packet.Type.__dict__[attr] for attr in Packet.Type.__dict__
|
|
if re.search("__.+?__", attr) is None
|
|
and type(Packet.Type.__dict__[attr]) is bytes
|
|
]:
|
|
if cmd == val:
|
|
return cmd
|
|
return None
|
|
|
|
@staticmethod
|
|
def for_method(method: str) -> bytes:
|
|
if method == "SUB":
|
|
return Packet.Type.mercury_sub
|
|
if method == "UNSUB":
|
|
return Packet.Type.mercury_unsub
|
|
return Packet.Type.mercury_req
|
|
|
|
|
|
class Shannon:
|
|
n = 16
|
|
fold = n
|
|
initkonst = 0x6996c53a
|
|
keyp = 13
|
|
r: list
|
|
crc: list
|
|
init_r: list
|
|
konst: int
|
|
sbuf: int
|
|
mbuf: int
|
|
nbuf: int
|
|
|
|
def __init__(self):
|
|
self.r = [0 for _ in range(self.n)]
|
|
self.crc = [0 for _ in range(self.n)]
|
|
self.init_r = [0 for _ in range(self.n)]
|
|
|
|
def rotl(self, i: int, distance: int) -> int:
|
|
return ((i << distance) | (i >> (32 - distance))) & 0xffffffff
|
|
|
|
def sbox(self, i: int) -> int:
|
|
i ^= self.rotl(i, 5) | self.rotl(i, 7)
|
|
i ^= self.rotl(i, 19) | self.rotl(i, 22)
|
|
return i
|
|
|
|
def sbox2(self, i: int) -> int:
|
|
i ^= self.rotl(i, 7) | self.rotl(i, 22)
|
|
i ^= self.rotl(i, 5) | self.rotl(i, 19)
|
|
return i
|
|
|
|
def cycle(self) -> None:
|
|
t: int
|
|
t = self.r[12] ^ self.r[13] ^ self.konst
|
|
t = self.sbox(t) ^ self.rotl(self.r[0], 1)
|
|
for i in range(1, self.n):
|
|
self.r[i - 1] = self.r[i]
|
|
self.r[self.n - 1] = t
|
|
t = self.sbox2(self.r[2] ^ self.r[15])
|
|
self.r[0] ^= t
|
|
self.sbuf = t ^ self.r[8] ^ self.r[12]
|
|
|
|
def crc_func(self, i: int) -> None:
|
|
t: int
|
|
t = self.crc[0] ^ self.crc[2] ^ self.crc[15] ^ i
|
|
for j in range(1, self.n):
|
|
self.crc[j - 1] = self.crc[j]
|
|
self.crc[self.n - 1] = t
|
|
|
|
def mac_func(self, i: int) -> None:
|
|
self.crc_func(i)
|
|
self.r[self.keyp] ^= i
|
|
|
|
def init_state(self) -> None:
|
|
self.r[0] = 1
|
|
self.r[1] = 1
|
|
for i in range(2, self.n):
|
|
self.r[i] = self.r[i - 1] + self.r[i - 2]
|
|
self.konst = self.initkonst
|
|
|
|
def save_state(self) -> None:
|
|
for i in range(self.n):
|
|
self.init_r[i] = self.r[i]
|
|
|
|
def reload_state(self) -> None:
|
|
for i in range(self.n):
|
|
self.r[i] = self.init_r[i]
|
|
|
|
def gen_konst(self) -> None:
|
|
self.konst = self.r[0]
|
|
|
|
def add_key(self, k: int) -> None:
|
|
self.r[self.keyp] ^= k
|
|
|
|
def diffuse(self) -> None:
|
|
for _ in range(self.fold):
|
|
self.cycle()
|
|
|
|
def load_key(self, key: bytes) -> None:
|
|
i: int
|
|
j: int
|
|
t: int
|
|
padding_size = int((len(key) + 3) / 4) * 4 - len(key)
|
|
key = key + (b"\x00" * padding_size) + struct.pack("<I", len(key))
|
|
for i in range(0, len(key), 4):
|
|
self.r[self.keyp] = \
|
|
self.r[self.keyp] ^ \
|
|
struct.unpack("<I", key[i: i + 4])[0]
|
|
self.cycle()
|
|
for i in range(self.n):
|
|
self.crc[i] = self.r[i]
|
|
self.diffuse()
|
|
for i in range(self.n):
|
|
self.r[i] ^= self.crc[i]
|
|
|
|
def key(self, key: bytes) -> None:
|
|
self.init_state()
|
|
self.load_key(key)
|
|
self.gen_konst()
|
|
self.save_state()
|
|
self.nbuf = 0
|
|
|
|
def nonce(self, nonce: typing.Union[bytes, int]) -> None:
|
|
if type(nonce) is int:
|
|
nonce = bytes(struct.pack(">I", nonce))
|
|
self.reload_state()
|
|
self.konst = self.initkonst
|
|
self.load_key(nonce)
|
|
self.gen_konst()
|
|
self.nbuf = 0
|
|
|
|
def encrypt(self, buffer: bytes, n: int = None) -> bytes:
|
|
if n is None:
|
|
return self.encrypt(buffer, len(buffer))
|
|
buffer = bytearray(buffer)
|
|
i = 0
|
|
j: int
|
|
t: int
|
|
if self.nbuf != 0:
|
|
while self.nbuf != 0 and n != 0:
|
|
self.mbuf ^= (buffer[i] & 0xff) << (32 - self.nbuf)
|
|
buffer[i] ^= (self.sbuf >> (32 - self.nbuf)) & 0xff
|
|
i += 1
|
|
self.nbuf -= 8
|
|
n -= 1
|
|
if self.nbuf != 0:
|
|
return b""
|
|
self.mac_func(self.mbuf)
|
|
j = n & ~0x03
|
|
while i < j:
|
|
self.cycle()
|
|
t = ((buffer[i + 3] & 0xFF) << 24) | \
|
|
((buffer[i + 2] & 0xFF) << 16) | \
|
|
((buffer[i + 1] & 0xFF) << 8) | \
|
|
(buffer[i] & 0xFF)
|
|
self.mac_func(t)
|
|
t ^= self.sbuf
|
|
buffer[i + 3] = (t >> 24) & 0xFF
|
|
buffer[i + 2] = (t >> 16) & 0xFF
|
|
buffer[i + 1] = (t >> 8) & 0xFF
|
|
buffer[i] = t & 0xFF
|
|
i += 4
|
|
n &= 0x03
|
|
if n != 0:
|
|
self.cycle()
|
|
self.mbuf = 0
|
|
self.nbuf = 32
|
|
while self.nbuf != 0 and n != 0:
|
|
self.mbuf ^= (buffer[i] & 0xff) << (32 - self.nbuf)
|
|
buffer[i] ^= (self.sbuf >> (32 - self.nbuf)) & 0xff
|
|
i += 1
|
|
self.nbuf -= 8
|
|
n -= 1
|
|
return bytes(buffer)
|
|
|
|
def decrypt(self, buffer: bytes, n: int = None) -> bytes:
|
|
if n is None:
|
|
return self.decrypt(buffer, len(buffer))
|
|
buffer = bytearray(buffer)
|
|
i = 0
|
|
j: int
|
|
t: int
|
|
if self.nbuf != 0:
|
|
while self.nbuf != 0 and n != 0:
|
|
buffer[i] ^= (self.sbuf >> (32 - self.nbuf)) & 0xff
|
|
self.mbuf ^= (buffer[i] & 0xff) << (32 - self.nbuf)
|
|
i += 1
|
|
self.nbuf -= 8
|
|
n -= 1
|
|
if self.nbuf != 0:
|
|
return b""
|
|
self.mac_func(self.mbuf)
|
|
j = n & ~0x03
|
|
while i < j:
|
|
self.cycle()
|
|
t = ((buffer[i + 3] & 0xFF) << 24) | \
|
|
((buffer[i + 2] & 0xFF) << 16) | \
|
|
((buffer[i + 1] & 0xFF) << 8) | \
|
|
(buffer[i] & 0xFF)
|
|
t ^= self.sbuf
|
|
self.mac_func(t)
|
|
buffer[i + 3] = (t >> 24) & 0xFF
|
|
buffer[i + 2] = (t >> 16) & 0xFF
|
|
buffer[i + 1] = (t >> 8) & 0xFF
|
|
buffer[i] = t & 0xFF
|
|
i += 4
|
|
n &= 0x03
|
|
if n != 0:
|
|
self.cycle()
|
|
self.mbuf = 0
|
|
self.nbuf = 32
|
|
while self.nbuf != 0 and n != 0:
|
|
buffer[i] ^= (self.sbuf >> (32 - self.nbuf)) & 0xff
|
|
self.mbuf ^= (buffer[i] & 0xff) << (32 - self.nbuf)
|
|
i += 1
|
|
self.nbuf -= 8
|
|
n -= 1
|
|
return bytes(buffer)
|
|
|
|
def finish(self, n: int) -> bytes:
|
|
buffer = bytearray(4)
|
|
i = 0
|
|
j: int
|
|
if self.nbuf != 0:
|
|
self.mac_func(self.mbuf)
|
|
self.cycle()
|
|
self.add_key(self.initkonst ^ (self.nbuf << 3))
|
|
self.nbuf = 0
|
|
for j in range(self.n):
|
|
self.r[j] ^= self.crc[j]
|
|
self.diffuse()
|
|
while n > 0:
|
|
self.cycle()
|
|
if n >= 4:
|
|
buffer[i + 3] = (self.sbuf >> 24) & 0xff
|
|
buffer[i + 2] = (self.sbuf >> 16) & 0xff
|
|
buffer[i + 1] = (self.sbuf >> 8) & 0xff
|
|
buffer[i] = self.sbuf & 0xff
|
|
n -= 4
|
|
i += 4
|
|
else:
|
|
for j in range(n):
|
|
buffer[i + j] = (self.sbuf >> (i * 8)) & 0xff
|
|
break
|
|
return bytes(buffer)
|