mirror of https://github.com/Diazole/dumper.git
91 lines
3.4 KiB
Python
91 lines
3.4 KiB
Python
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import io
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import json
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import struct
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from base64 import b64decode, b64encode
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from binascii import hexlify
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def create_table():
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a = []
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for i in range(256):
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k = i << 24
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for _ in range(8):
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k = (k << 1) ^ 0x4c11db7 if k & 0x80000000 else k << 1
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a.append(k & 0xffffffff)
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return a
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def crc32_mpeg(data, length):
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crc_val = 0xFFFFFFFF
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crctab = create_table()
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for i in range(length):
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crc_val = (crctab[(data[i] & 0xFF) ^ (crc_val >> 24)] ^ (crc_val << 8)) & 0xFFFFFFFF
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return crc_val
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class Keybox:
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def __init__(self, keybox_data: any):
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if isinstance(keybox_data, str):
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self.__keybox = b64decode(keybox_data)
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elif isinstance(keybox_data, io.BufferedReader):
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self.__keybox = keybox_data.read()
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elif isinstance(keybox_data, dict):
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self.__keybox = self.__generate_crc(keybox_data)
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else:
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print(type(keybox_data))
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raise ValueError('unable to read the file/string, etc')
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self.__parse()
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@staticmethod
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def __generate_crc(keybox) -> bytes:
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device_id = keybox['device_id']
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device_token = keybox['device_token']
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device_key = keybox['device_key']
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key_box = bytes.fromhex(device_id) + bytes.fromhex(device_key) + bytes.fromhex(device_token) + b'kbox'
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crc = crc32_mpeg(key_box, len(key_box))
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key_box += struct.pack('>I', crc)
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key_box += keybox['security_level'].encode()
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return key_box
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def __parse(self):
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self.device_id = self.__keybox[0:32]
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# this is the aes key
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self.device_key = self.__keybox[32:48]
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self.device_token = self.__keybox[48:120]
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self.keybox_tag = self.__keybox[120:124]
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self.crc32 = struct.unpack('>I', self.__keybox[124:128])[0]
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self.crc32_raw = hexlify(self.__keybox[124:128])
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# this is optional, most likely not required
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self.level_tag = self.__keybox[128:132]
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self.flags = struct.unpack(">L", self.__keybox[48:120][0:4])[0]
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self.version = struct.unpack(">I", self.__keybox[48:52])[0]
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self.system_id = struct.unpack(">I", self.__keybox[52:56])[0]
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# or unique_id as in wv pdf, encrypted by pre-provisioning key
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self.provisioning_id = self.__keybox[56:72]
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# encrypted with unique id, contains device key, device key hash, and flags
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self.encrypted_bits = self.__keybox[72:120]
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def __repr__(self):
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return json.dumps({
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'device_id': b64encode(self.device_id).decode(),
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'device_id_size': len(self.device_id),
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'device_key': b64encode(self.device_key).decode(),
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'device_token': b64encode(self.device_token).decode(),
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'device_token_size': len(self.device_token),
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'kbox_tag': self.keybox_tag.decode(),
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'crc32': self.crc32,
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'crc32_raw': self.crc32_raw.decode(),
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'lvl1_tag': self.level_tag.decode(),
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'flags': self.flags,
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'released': True if self.flags & 2 == 2 else False,
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'version': self.version,
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'system_id': self.system_id,
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'provisioning_id': b64encode(self.provisioning_id).decode(),
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'encrypted_bits': b64encode(self.encrypted_bits).decode(),
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'keybox': b64encode(self.__keybox).decode()
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}, indent=4)
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def get_keybox(self):
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return self.__keybox
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