mirror of
https://github.com/hyugogirubato/KeyDive.git
synced 2026-07-15 18:40:02 +02:00
114 lines
3.6 KiB
Python
114 lines
3.6 KiB
Python
from enum import Enum
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from typing import Optional
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from construct import BitStruct, Bytes, Const
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from construct import Enum as CEnum
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from construct import Int8ub, Int16ub
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from construct import Optional as COptional
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from construct import Padded, Padding, Struct, this
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from cryptography.hazmat.primitives import serialization
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from cryptography.hazmat.primitives.asymmetric.rsa import RSAPrivateKey
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from keydive.drm.protocol.license_pb2 import ClientIdentification
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class DeviceTypes(Enum):
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CHROME = 1
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ANDROID = 2
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class _Structures:
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magic = Const(b"WVD")
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header = Struct(
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"signature" / magic,
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"version" / Int8ub
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)
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v2 = Struct(
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"signature" / magic,
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"version" / Const(2, Int8ub),
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"type_" / CEnum(
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Int8ub,
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**{t.name: t.value for t in DeviceTypes}
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),
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"security_level" / Int8ub,
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"flags" / Padded(1, COptional(BitStruct(
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# no per-device flags yet
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Padding(8)
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))),
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"private_key_len" / Int16ub,
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"private_key" / Bytes(this.private_key_len),
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"client_id_len" / Int16ub,
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"client_id" / Bytes(this.client_id_len)
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)
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class Device:
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"""
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A minimal implementation of a WVD (Widevine Device) structure,
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modeled after the pywidevine library.
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This class provides a lightweight alternative to the full `pywidevine.Device`,
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retaining only the essential fields for constructing and serializing Widevine device
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blobs in version 2 format, without performing certificate validation or VMP handling.
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"""
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Structures = _Structures
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supported_structure = Structures.v2
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def __init__(
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self,
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type_: DeviceTypes,
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security_level: int,
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flags: Optional[dict],
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private_key: RSAPrivateKey,
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client_id: ClientIdentification,
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):
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"""
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Initialize the Device object.
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Args:
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type_ (DeviceTypes or str): The type of device.
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security_level (int): The DRM security level (e.g., 1, 3).
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flags (Optional[dict]): Optional feature flags (reserved for future use).
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private_key (RSAPrivateKey): The device's RSA private key.
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client_id (ClientIdentification): The protobuf client identifier.
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"""
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self.type = DeviceTypes[type_] if isinstance(type_, str) else type_
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self.security_level = security_level
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self.flags = flags or {}
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self.private_key = private_key
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self.client_id = client_id
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def dumps(self) -> bytes:
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"""
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Serialize the Device object into a WVD-compatible binary format.
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Returns:
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bytes: A binary representation of the device data.
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"""
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# Serialize the client ID protobuf message
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bin_client_id = self.client_id.SerializeToString()
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# Serialize the private RSA key to DER format
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bin_private_key = self.private_key.private_bytes(
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encoding=serialization.Encoding.DER,
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format=serialization.PrivateFormat.TraditionalOpenSSL,
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encryption_algorithm=serialization.NoEncryption()
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)
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# Build the structured binary representation
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return self.supported_structure.build(dict(
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version=2,
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type_=self.type.value,
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security_level=self.security_level,
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flags=self.flags,
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private_key_len=len(bin_private_key),
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private_key=bin_private_key,
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client_id_len=len(bin_client_id),
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client_id=bin_client_id
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))
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__all__ = ('Device', 'DeviceTypes')
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