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widevinedump
2021-12-24 09:35:09 +05:30
parent 0bfa3f62e9
commit 4966f5355a
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pywidevine/cdm/__init__.py Normal file
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pywidevine/cdm/cdm.py Normal file
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import base64
import os
import time
import binascii
from google.protobuf.message import DecodeError
from google.protobuf import text_format
from pywidevine.cdm.formats import wv_proto2_pb2 as wv_proto2
from pywidevine.cdm.session import Session
from pywidevine.cdm.key import Key
from Cryptodome.Random import get_random_bytes
from Cryptodome.Random import random
from Cryptodome.Cipher import PKCS1_OAEP, AES
from Cryptodome.Hash import CMAC, SHA256, HMAC, SHA1
from Cryptodome.PublicKey import RSA
from Cryptodome.Signature import pss
from Cryptodome.Util import Padding
import logging
class Cdm:
def __init__(self):
self.logger = logging.getLogger(__name__)
self.sessions = {}
self.loglevel = logging.DEBUG
"""this if statement sets the way the messages are display to the screen, this is a full"""
"""debug logging"""
if self.loglevel == logging.DEBUG:
logging.basicConfig(
format='%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(message)s',
datefmt='%Y-%m-%d %I:%M:%S %p',
level=self.loglevel,
)
logging.getLogger("requests").setLevel(logging.WARNING)
"""basic logging that only shows the message"""
if self.loglevel == logging.INFO:
logging.basicConfig(
format='%(message)s',
level=self.loglevel,
)
def open_session(self, init_data_b64, device, raw_init_data = None, offline=False):
self.logger.debug("open_session(init_data_b64={}, device={}".format(init_data_b64, device))
self.logger.info("opening new cdm session")
if device.session_id_type == 'android':
# format: 16 random hexdigits, 2 digit counter, 14 0s
rand_ascii = ''.join(random.choice('ABCDEF0123456789') for _ in range(16))
counter = '01' # this resets regularly so its fine to use 01
rest = '00000000000000'
session_id = rand_ascii + counter + rest
session_id = session_id.encode('ascii')
elif device.session_id_type == 'chrome':
rand_bytes = get_random_bytes(16)
session_id = rand_bytes
else:
# other formats NYI
self.logger.error("device type is unusable")
return 1
if raw_init_data and isinstance(raw_init_data, (bytes, bytearray)):
# used for NF key exchange, where they don't provide a valid PSSH
init_data = raw_init_data
self.raw_pssh = True
else:
init_data = self._parse_init_data(init_data_b64)
self.raw_pssh = False
if init_data:
new_session = Session(session_id, init_data, device, offline)
else:
self.logger.error("unable to parse init data")
return 1
self.sessions[session_id] = new_session
self.logger.info("session opened and init data parsed successfully")
return session_id
def _parse_init_data(self, init_data_b64):
parsed_init_data = wv_proto2.WidevineCencHeader()
try:
self.logger.debug("trying to parse init_data directly")
parsed_init_data.ParseFromString(base64.b64decode(init_data_b64)[32:])
except DecodeError:
self.logger.debug("unable to parse as-is, trying with removed pssh box header")
try:
id_bytes = parsed_init_data.ParseFromString(base64.b64decode(init_data_b64)[32:])
except DecodeError:
self.logger.error("unable to parse, unsupported init data format")
return None
self.logger.debug("init_data:")
for line in text_format.MessageToString(parsed_init_data).splitlines():
self.logger.debug(line)
return parsed_init_data
def close_session(self, session_id):
self.logger.debug("close_session(session_id={})".format(session_id))
self.logger.info("closing cdm session")
if session_id in self.sessions:
self.sessions.pop(session_id)
self.logger.info("cdm session closed")
return 0
else:
self.logger.info("session {} not found".format(session_id))
return 1
def set_service_certificate(self, session_id, cert_b64):
self.logger.debug("set_service_certificate(session_id={}, cert={})".format(session_id, cert_b64))
self.logger.info("setting service certificate")
if session_id not in self.sessions:
self.logger.error("session id doesn't exist")
return 1
session = self.sessions[session_id]
message = wv_proto2.SignedMessage()
try:
message.ParseFromString(base64.b64decode(cert_b64))
except DecodeError:
self.logger.error("failed to parse cert as SignedMessage")
service_certificate = wv_proto2.SignedDeviceCertificate()
if message.Type:
self.logger.debug("service cert provided as signedmessage")
try:
service_certificate.ParseFromString(message.Msg)
except DecodeError:
self.logger.error("failed to parse service certificate")
return 1
else:
self.logger.debug("service cert provided as signeddevicecertificate")
try:
service_certificate.ParseFromString(base64.b64decode(cert_b64))
except DecodeError:
self.logger.error("failed to parse service certificate")
return 1
self.logger.debug("service certificate:")
for line in text_format.MessageToString(service_certificate).splitlines():
self.logger.debug(line)
session.service_certificate = service_certificate
session.privacy_mode = True
return 0
def get_license_request(self, session_id):
self.logger.debug("get_license_request(session_id={})".format(session_id))
self.logger.info("getting license request")
if session_id not in self.sessions:
self.logger.error("session ID does not exist")
return 1
session = self.sessions[session_id]
# raw pssh will be treated as bytes and not parsed
if self.raw_pssh:
license_request = wv_proto2.SignedLicenseRequestRaw()
else:
license_request = wv_proto2.SignedLicenseRequest()
client_id = wv_proto2.ClientIdentification()
if not os.path.exists(session.device_config.device_client_id_blob_filename):
self.logger.error("no client ID blob available for this device")
return 1
with open(session.device_config.device_client_id_blob_filename, "rb") as f:
try:
cid_bytes = client_id.ParseFromString(f.read())
except DecodeError:
self.logger.error("client id failed to parse as protobuf")
return 1
self.logger.debug("building license request")
if not self.raw_pssh:
license_request.Type = wv_proto2.SignedLicenseRequest.MessageType.Value('LICENSE_REQUEST')
license_request.Msg.ContentId.CencId.Pssh.CopyFrom(session.init_data)
else:
license_request.Type = wv_proto2.SignedLicenseRequestRaw.MessageType.Value('LICENSE_REQUEST')
license_request.Msg.ContentId.CencId.Pssh = session.init_data # bytes
if session.offline:
license_type = wv_proto2.LicenseType.Value('OFFLINE')
else:
license_type = wv_proto2.LicenseType.Value('DEFAULT')
license_request.Msg.ContentId.CencId.LicenseType = license_type
license_request.Msg.ContentId.CencId.RequestId = session_id
license_request.Msg.Type = wv_proto2.LicenseRequest.RequestType.Value('NEW')
license_request.Msg.RequestTime = int(time.time())
license_request.Msg.ProtocolVersion = wv_proto2.ProtocolVersion.Value('CURRENT')
if session.device_config.send_key_control_nonce:
license_request.Msg.KeyControlNonce = random.randrange(1, 2**31)
if session.privacy_mode:
if session.device_config.vmp:
self.logger.debug("vmp required, adding to client_id")
self.logger.debug("reading vmp hashes")
vmp_hashes = wv_proto2.FileHashes()
with open(session.device_config.device_vmp_blob_filename, "rb") as f:
try:
vmp_bytes = vmp_hashes.ParseFromString(f.read())
except DecodeError:
self.logger.error("vmp hashes failed to parse as protobuf")
return 1
client_id._FileHashes.CopyFrom(vmp_hashes)
self.logger.debug("privacy mode & service certificate loaded, encrypting client id")
self.logger.debug("unencrypted client id:")
for line in text_format.MessageToString(client_id).splitlines():
self.logger.debug(line)
cid_aes_key = get_random_bytes(16)
cid_iv = get_random_bytes(16)
cid_cipher = AES.new(cid_aes_key, AES.MODE_CBC, cid_iv)
encrypted_client_id = cid_cipher.encrypt(Padding.pad(client_id.SerializeToString(), 16))
service_public_key = RSA.importKey(session.service_certificate._DeviceCertificate.PublicKey)
service_cipher = PKCS1_OAEP.new(service_public_key)
encrypted_cid_key = service_cipher.encrypt(cid_aes_key)
encrypted_client_id_proto = wv_proto2.EncryptedClientIdentification()
encrypted_client_id_proto.ServiceId = session.service_certificate._DeviceCertificate.ServiceId
encrypted_client_id_proto.ServiceCertificateSerialNumber = session.service_certificate._DeviceCertificate.SerialNumber
encrypted_client_id_proto.EncryptedClientId = encrypted_client_id
encrypted_client_id_proto.EncryptedClientIdIv = cid_iv
encrypted_client_id_proto.EncryptedPrivacyKey = encrypted_cid_key
license_request.Msg.EncryptedClientId.CopyFrom(encrypted_client_id_proto)
else:
license_request.Msg.ClientId.CopyFrom(client_id)
if session.device_config.private_key_available:
key = RSA.importKey(open(session.device_config.device_private_key_filename).read())
session.device_key = key
else:
self.logger.error("need device private key, other methods unimplemented")
return 1
self.logger.debug("signing license request")
hash = SHA1.new(license_request.Msg.SerializeToString())
signature = pss.new(key).sign(hash)
license_request.Signature = signature
session.license_request = license_request
self.logger.debug("license request:")
for line in text_format.MessageToString(session.license_request).splitlines():
self.logger.debug(line)
self.logger.info("license request created")
self.logger.debug("license request b64: {}".format(base64.b64encode(license_request.SerializeToString())))
return license_request.SerializeToString()
def provide_license(self, session_id, license_b64):
self.logger.debug("provide_license(session_id={}, license_b64={})".format(session_id, license_b64))
self.logger.info("decrypting provided license")
if session_id not in self.sessions:
self.logger.error("session does not exist")
return 1
session = self.sessions[session_id]
if not session.license_request:
self.logger.error("generate a license request first!")
return 1
license = wv_proto2.SignedLicense()
try:
license.ParseFromString(base64.b64decode(license_b64))
except DecodeError:
self.logger.error("unable to parse license - check protobufs")
return 1
session.license = license
self.logger.debug("license:")
for line in text_format.MessageToString(license).splitlines():
self.logger.debug(line)
self.logger.debug("deriving keys from session key")
oaep_cipher = PKCS1_OAEP.new(session.device_key)
session.session_key = oaep_cipher.decrypt(license.SessionKey)
lic_req_msg = session.license_request.Msg.SerializeToString()
enc_key_base = b"ENCRYPTION\000" + lic_req_msg + b"\0\0\0\x80"
auth_key_base = b"AUTHENTICATION\0" + lic_req_msg + b"\0\0\2\0"
enc_key = b"\x01" + enc_key_base
auth_key_1 = b"\x01" + auth_key_base
auth_key_2 = b"\x02" + auth_key_base
auth_key_3 = b"\x03" + auth_key_base
auth_key_4 = b"\x04" + auth_key_base
cmac_obj = CMAC.new(session.session_key, ciphermod=AES)
cmac_obj.update(enc_key)
enc_cmac_key = cmac_obj.digest()
cmac_obj = CMAC.new(session.session_key, ciphermod=AES)
cmac_obj.update(auth_key_1)
auth_cmac_key_1 = cmac_obj.digest()
cmac_obj = CMAC.new(session.session_key, ciphermod=AES)
cmac_obj.update(auth_key_2)
auth_cmac_key_2 = cmac_obj.digest()
cmac_obj = CMAC.new(session.session_key, ciphermod=AES)
cmac_obj.update(auth_key_3)
auth_cmac_key_3 = cmac_obj.digest()
cmac_obj = CMAC.new(session.session_key, ciphermod=AES)
cmac_obj.update(auth_key_4)
auth_cmac_key_4 = cmac_obj.digest()
auth_cmac_combined_1 = auth_cmac_key_1 + auth_cmac_key_2
auth_cmac_combined_2 = auth_cmac_key_3 + auth_cmac_key_4
session.derived_keys['enc'] = enc_cmac_key
session.derived_keys['auth_1'] = auth_cmac_combined_1
session.derived_keys['auth_2'] = auth_cmac_combined_2
self.logger.debug('verifying license signature')
lic_hmac = HMAC.new(session.derived_keys['auth_1'], digestmod=SHA256)
lic_hmac.update(license.Msg.SerializeToString())
self.logger.debug("calculated sig: {} actual sig: {}".format(lic_hmac.hexdigest(), binascii.hexlify(license.Signature)))
if lic_hmac.digest() != license.Signature:
self.logger.info("license signature doesn't match - writing bin so they can be debugged")
with open("original_lic.bin", "wb") as f:
f.write(base64.b64decode(license_b64))
with open("parsed_lic.bin", "wb") as f:
f.write(license.SerializeToString())
self.logger.info("continuing anyway")
self.logger.debug("key count: {}".format(len(license.Msg.Key)))
for key in license.Msg.Key:
if key.Id:
key_id = key.Id
else:
key_id = wv_proto2.License.KeyContainer.KeyType.Name(key.Type).encode('utf-8')
encrypted_key = key.Key
iv = key.Iv
type = wv_proto2.License.KeyContainer.KeyType.Name(key.Type)
cipher = AES.new(session.derived_keys['enc'], AES.MODE_CBC, iv=iv)
decrypted_key = cipher.decrypt(encrypted_key)
self.logger.debug(Padding.unpad(decrypted_key, 16))
if type == "OPERATOR_SESSION":
permissions = []
perms = key._OperatorSessionKeyPermissions
for (descriptor, value) in perms.ListFields():
if value == 1:
permissions.append(descriptor.name)
print(permissions)
else:
permissions = []
session.keys.append(Key(key_id, type, Padding.unpad(decrypted_key, 16), permissions))
self.logger.info("decrypted all keys")
return 0
def get_keys(self, session_id):
if session_id in self.sessions:
return self.sessions[session_id].keys
else:
self.logger.error("session not found")
return 1

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pywidevine/cdm/deviceconfig.py Normal file
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import os
device_nexus6_lvl1 = {
'name': 'nexus6_lvl1',
'description': 'nexus 6 firmware 5.1.1 lvl1 security level',
'security_level': 3,
'session_id_type': 'android',
'private_key_available': True,
'vmp': False,
'send_key_control_nonce': True
}
device_chromecdm_1022 = {
'name': 'chromecdm_1022',
'description': 'chrome cdm windows 1022',
'security_level': 3,
'session_id_type': 'chrome',
'private_key_available': True,
'vmp': True,
'send_key_control_nonce': False
}
devices_available = [device_nexus6_lvl1, device_chromecdm_1022]
FILES_FOLDER = 'devices'
class DeviceConfig:
def __init__(self, device):
self.device_name = device['name']
self.description = device['description']
self.security_level = device['security_level']
self.session_id_type = device['session_id_type']
self.private_key_available = device['private_key_available']
self.vmp = device['vmp']
self.send_key_control_nonce = device['send_key_control_nonce']
if 'keybox_filename' in device:
self.keybox_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['keybox_filename'])
else:
self.keybox_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'keybox')
if 'device_cert_filename' in device:
self.device_cert_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_cert_filename'])
else:
self.device_cert_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_cert')
if 'device_private_key_filename' in device:
self.device_private_key_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_private_key_filename'])
else:
self.device_private_key_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_private_key')
if 'device_client_id_blob_filename' in device:
self.device_client_id_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_client_id_blob_filename'])
else:
self.device_client_id_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_client_id_blob')
if 'device_vmp_blob_filename' in device:
self.device_vmp_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], device['device_vmp_blob_filename'])
else:
self.device_vmp_blob_filename = os.path.join(os.path.dirname(__file__), FILES_FOLDER, device['name'], 'device_vmp_blob')
def __repr__(self):
return "DeviceConfig(name={}, description={}, security_level={}, session_id_type={}, private_key_available={}, vmp={})".format(self.device_name, self.description, self.security_level, self.session_id_type, self.private_key_available, self.vmp)

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pywidevine/cdm/devices/nexus6_lvl1/config.json Normal file
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{
"token": "token.bin",
"client_info":
{
"company_name": "motorola",
"model_name": "Nexus 1",
"architecture_name": "armeabi-v7a",
"device_name": "shamu",
"product_name": "shamu",
"build_info": "google/shamu/shamu:5.1.1/LMY48M/2167285:user/release-keys",
"device_id": "TU1JX0VGRkYwRkU2NUQ5OAAAAAAAAAAAAAAAAAAAAAA=",
"os_version": "5.1.1"
},
"capabilities":
{
"session_token": 1,
"max_hdcp_version": "HDCP_V2_2",
"oem_crypto_api_version": 9
}
}

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pywidevine/cdm/devices/nexus6_lvl1/device_client_id_blob Normal file
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pywidevine/cdm/devices/nexus6_lvl1/device_private_key Normal file
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-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----

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pywidevine/cdm/devices/nexus6_lvl1/token.bin Normal file
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pywidevine/cdm/formats/__init__.py Normal file
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pywidevine/cdm/formats/wv_proto2.proto Normal file
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syntax = "proto2";
// from x86 (partial), most of it from the ARM version:
message ClientIdentification {
enum TokenType {
KEYBOX = 0;
DEVICE_CERTIFICATE = 1;
REMOTE_ATTESTATION_CERTIFICATE = 2;
}
message NameValue {
required string Name = 1;
required string Value = 2;
}
message ClientCapabilities {
enum HdcpVersion {
HDCP_NONE = 0;
HDCP_V1 = 1;
HDCP_V2 = 2;
HDCP_V2_1 = 3;
HDCP_V2_2 = 4;
}
optional uint32 ClientToken = 1;
optional uint32 SessionToken = 2;
optional uint32 VideoResolutionConstraints = 3;
optional HdcpVersion MaxHdcpVersion = 4;
optional uint32 OemCryptoApiVersion = 5;
}
required TokenType Type = 1;
//optional bytes Token = 2; // by default the client treats this as blob, but it's usually a DeviceCertificate, so for usefulness sake, I'm replacing it with this one:
optional SignedDeviceCertificate Token = 2; // use this when parsing, "bytes" when building a client id blob
repeated NameValue ClientInfo = 3;
optional bytes ProviderClientToken = 4;
optional uint32 LicenseCounter = 5;
optional ClientCapabilities _ClientCapabilities = 6; // how should we deal with duped names? will have to look at proto docs later
optional FileHashes _FileHashes = 7; // vmp blob goes here
}
message DeviceCertificate {
enum CertificateType {
ROOT = 0;
INTERMEDIATE = 1;
USER_DEVICE = 2;
SERVICE = 3;
}
required CertificateType Type = 1; // the compiled code reused this as ProvisionedDeviceInfo.WvSecurityLevel, however that is incorrect (compiler aliased it as they're both identical as a structure)
optional bytes SerialNumber = 2;
optional uint32 CreationTimeSeconds = 3;
optional bytes PublicKey = 4;
optional uint32 SystemId = 5;
optional uint32 TestDeviceDeprecated = 6; // is it bool or int?
optional bytes ServiceId = 7; // service URL for service certificates
}
// missing some references,
message DeviceCertificateStatus {
enum CertificateStatus {
VALID = 0;
REVOKED = 1;
}
optional bytes SerialNumber = 1;
optional CertificateStatus Status = 2;
optional ProvisionedDeviceInfo DeviceInfo = 4; // where is 3? is it deprecated?
}
message DeviceCertificateStatusList {
optional uint32 CreationTimeSeconds = 1;
repeated DeviceCertificateStatus CertificateStatus = 2;
}
message EncryptedClientIdentification {
required string ServiceId = 1;
optional bytes ServiceCertificateSerialNumber = 2;
required bytes EncryptedClientId = 3;
required bytes EncryptedClientIdIv = 4;
required bytes EncryptedPrivacyKey = 5;
}
// todo: fill (for this top-level type, it might be impossible/difficult)
enum LicenseType {
ZERO = 0;
DEFAULT = 1; // 1 is STREAMING/temporary license; on recent versions may go up to 3 (latest x86); it might be persist/don't persist type, unconfirmed
OFFLINE = 2;
}
// todo: fill (for this top-level type, it might be impossible/difficult)
// this is just a guess because these globals got lost, but really, do we need more?
enum ProtocolVersion {
CURRENT = 21; // don't have symbols for this
}
message LicenseIdentification {
optional bytes RequestId = 1;
optional bytes SessionId = 2;
optional bytes PurchaseId = 3;
optional LicenseType Type = 4;
optional uint32 Version = 5;
optional bytes ProviderSessionToken = 6;
}
message License {
message Policy {
optional bool CanPlay = 1; // changed from uint32 to bool
optional bool CanPersist = 2;
optional bool CanRenew = 3;
optional uint32 RentalDurationSeconds = 4;
optional uint32 PlaybackDurationSeconds = 5;
optional uint32 LicenseDurationSeconds = 6;
optional uint32 RenewalRecoveryDurationSeconds = 7;
optional string RenewalServerUrl = 8;
optional uint32 RenewalDelaySeconds = 9;
optional uint32 RenewalRetryIntervalSeconds = 10;
optional bool RenewWithUsage = 11; // was uint32
}
message KeyContainer {
enum KeyType {
SIGNING = 1;
CONTENT = 2;
KEY_CONTROL = 3;
OPERATOR_SESSION = 4;
}
enum SecurityLevel {
SW_SECURE_CRYPTO = 1;
SW_SECURE_DECODE = 2;
HW_SECURE_CRYPTO = 3;
HW_SECURE_DECODE = 4;
HW_SECURE_ALL = 5;
}
message OutputProtection {
enum CGMS {
COPY_FREE = 0;
COPY_ONCE = 2;
COPY_NEVER = 3;
CGMS_NONE = 0x2A; // PC default!
}
optional ClientIdentification.ClientCapabilities.HdcpVersion Hdcp = 1; // it's most likely a copy of Hdcp version available here, but compiler optimized it away
optional CGMS CgmsFlags = 2;
}
message KeyControl {
required bytes KeyControlBlock = 1; // what is this?
required bytes Iv = 2;
}
message OperatorSessionKeyPermissions {
optional uint32 AllowEncrypt = 1;
optional uint32 AllowDecrypt = 2;
optional uint32 AllowSign = 3;
optional uint32 AllowSignatureVerify = 4;
}
message VideoResolutionConstraint {
optional uint32 MinResolutionPixels = 1;
optional uint32 MaxResolutionPixels = 2;
optional OutputProtection RequiredProtection = 3;
}
optional bytes Id = 1;
optional bytes Iv = 2;
optional bytes Key = 3;
optional KeyType Type = 4;
optional SecurityLevel Level = 5;
optional OutputProtection RequiredProtection = 6;
optional OutputProtection RequestedProtection = 7;
optional KeyControl _KeyControl = 8; // duped names, etc
optional OperatorSessionKeyPermissions _OperatorSessionKeyPermissions = 9; // duped names, etc
repeated VideoResolutionConstraint VideoResolutionConstraints = 10;
}
optional LicenseIdentification Id = 1;
optional Policy _Policy = 2; // duped names, etc
repeated KeyContainer Key = 3;
optional uint32 LicenseStartTime = 4;
optional uint32 RemoteAttestationVerified = 5; // bool?
optional bytes ProviderClientToken = 6;
// there might be more, check with newer versions (I see field 7-8 in a lic)
// this appeared in latest x86:
optional uint32 ProtectionScheme = 7; // type unconfirmed fully, but it's likely as WidevineCencHeader describesit (fourcc)
}
message LicenseError {
enum Error {
INVALID_DEVICE_CERTIFICATE = 1;
REVOKED_DEVICE_CERTIFICATE = 2;
SERVICE_UNAVAILABLE = 3;
}
//LicenseRequest.RequestType ErrorCode; // clang mismatch
optional Error ErrorCode = 1;
}
message LicenseRequest {
message ContentIdentification {
message CENC {
//optional bytes Pssh = 1; // the client's definition is opaque, it doesn't care about the contents, but the PSSH has a clear definition that is understood and requested by the server, thus I'll replace it with:
optional WidevineCencHeader Pssh = 1;
optional LicenseType LicenseType = 2; // unfortunately the LicenseType symbols are not present, acceptable value seems to only be 1 (is this persist/don't persist? look into it!)
optional bytes RequestId = 3;
}
message WebM {
optional bytes Header = 1; // identical to CENC, aside from PSSH and the parent field number used
optional LicenseType LicenseType = 2;
optional bytes RequestId = 3;
}
message ExistingLicense {
optional LicenseIdentification LicenseId = 1;
optional uint32 SecondsSinceStarted = 2;
optional uint32 SecondsSinceLastPlayed = 3;
optional bytes SessionUsageTableEntry = 4; // interesting! try to figure out the connection between the usage table blob and KCB!
}
optional CENC CencId = 1;
optional WebM WebmId = 2;
optional ExistingLicense License = 3;
}
enum RequestType {
NEW = 1;
RENEWAL = 2;
RELEASE = 3;
}
optional ClientIdentification ClientId = 1;
optional ContentIdentification ContentId = 2;
optional RequestType Type = 3;
optional uint32 RequestTime = 4;
optional bytes KeyControlNonceDeprecated = 5;
optional ProtocolVersion ProtocolVersion = 6; // lacking symbols for this
optional uint32 KeyControlNonce = 7;
optional EncryptedClientIdentification EncryptedClientId = 8;
}
// raw pssh hack
message LicenseRequestRaw {
message ContentIdentification {
message CENC {
optional bytes Pssh = 1; // the client's definition is opaque, it doesn't care about the contents, but the PSSH has a clear definition that is understood and requested by the server, thus I'll replace it with:
//optional WidevineCencHeader Pssh = 1;
optional LicenseType LicenseType = 2; // unfortunately the LicenseType symbols are not present, acceptable value seems to only be 1 (is this persist/don't persist? look into it!)
optional bytes RequestId = 3;
}
message WebM {
optional bytes Header = 1; // identical to CENC, aside from PSSH and the parent field number used
optional LicenseType LicenseType = 2;
optional bytes RequestId = 3;
}
message ExistingLicense {
optional LicenseIdentification LicenseId = 1;
optional uint32 SecondsSinceStarted = 2;
optional uint32 SecondsSinceLastPlayed = 3;
optional bytes SessionUsageTableEntry = 4; // interesting! try to figure out the connection between the usage table blob and KCB!
}
optional CENC CencId = 1;
optional WebM WebmId = 2;
optional ExistingLicense License = 3;
}
enum RequestType {
NEW = 1;
RENEWAL = 2;
RELEASE = 3;
}
optional ClientIdentification ClientId = 1;
optional ContentIdentification ContentId = 2;
optional RequestType Type = 3;
optional uint32 RequestTime = 4;
optional bytes KeyControlNonceDeprecated = 5;
optional ProtocolVersion ProtocolVersion = 6; // lacking symbols for this
optional uint32 KeyControlNonce = 7;
optional EncryptedClientIdentification EncryptedClientId = 8;
}
message ProvisionedDeviceInfo {
enum WvSecurityLevel {
LEVEL_UNSPECIFIED = 0;
LEVEL_1 = 1;
LEVEL_2 = 2;
LEVEL_3 = 3;
}
optional uint32 SystemId = 1;
optional string Soc = 2;
optional string Manufacturer = 3;
optional string Model = 4;
optional string DeviceType = 5;
optional uint32 ModelYear = 6;
optional WvSecurityLevel SecurityLevel = 7;
optional uint32 TestDevice = 8; // bool?
}
// todo: fill
message ProvisioningOptions {
}
// todo: fill
message ProvisioningRequest {
}
// todo: fill
message ProvisioningResponse {
}
message RemoteAttestation {
optional EncryptedClientIdentification Certificate = 1;
optional string Salt = 2;
optional string Signature = 3;
}
// todo: fill
message SessionInit {
}
// todo: fill
message SessionState {
}
// todo: fill
message SignedCertificateStatusList {
}
message SignedDeviceCertificate {
//optional bytes DeviceCertificate = 1; // again, they use a buffer where it's supposed to be a message, so we'll replace it with what it really is:
optional DeviceCertificate _DeviceCertificate = 1; // how should we deal with duped names? will have to look at proto docs later
optional bytes Signature = 2;
optional SignedDeviceCertificate Signer = 3;
}
// todo: fill
message SignedProvisioningMessage {
}
// the root of all messages, from either server or client
message SignedMessage {
enum MessageType {
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
optional MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
optional bytes Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
optional bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
optional bytes SessionKey = 4; // often RSA wrapped for licenses
optional RemoteAttestation RemoteAttestation = 5;
}
// This message is copied from google's docs, not reversed:
message WidevineCencHeader {
enum Algorithm {
UNENCRYPTED = 0;
AESCTR = 1;
};
optional Algorithm algorithm = 1;
repeated bytes key_id = 2;
// Content provider name.
optional string provider = 3;
// A content identifier, specified by content provider.
optional bytes content_id = 4;
// Track type. Acceptable values are SD, HD and AUDIO. Used to
// differentiate content keys used by an asset.
optional string track_type_deprecated = 5;
// The name of a registered policy to be used for this asset.
optional string policy = 6;
// Crypto period index, for media using key rotation.
optional uint32 crypto_period_index = 7;
// Optional protected context for group content. The grouped_license is a
// serialized SignedMessage.
optional bytes grouped_license = 8;
// Protection scheme identifying the encryption algorithm.
// Represented as one of the following 4CC values:
// 'cenc' (AESCTR), 'cbc1' (AESCBC),
// 'cens' (AESCTR subsample), 'cbcs' (AESCBC subsample).
optional uint32 protection_scheme = 9;
// Optional. For media using key rotation, this represents the duration
// of each crypto period in seconds.
optional uint32 crypto_period_seconds = 10;
}
// remove these when using it outside of protoc:
// from here on, it's just for testing, these messages don't exist in the binaries, I'm adding them to avoid detecting type programmatically
message SignedLicenseRequest {
enum MessageType {
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
optional MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
optional LicenseRequest Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
optional bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
optional bytes SessionKey = 4; // often RSA wrapped for licenses
optional RemoteAttestation RemoteAttestation = 5;
}
// hack
message SignedLicenseRequestRaw {
enum MessageType {
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
optional MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
optional LicenseRequestRaw Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
optional bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
optional bytes SessionKey = 4; // often RSA wrapped for licenses
optional RemoteAttestation RemoteAttestation = 5;
}
message SignedLicense {
enum MessageType {
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
optional MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
optional License Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
optional bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
optional bytes SessionKey = 4; // often RSA wrapped for licenses
optional RemoteAttestation RemoteAttestation = 5;
}
message SignedServiceCertificate {
enum MessageType {
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
optional MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
optional SignedDeviceCertificate Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
optional bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
optional bytes SessionKey = 4; // often RSA wrapped for licenses
optional RemoteAttestation RemoteAttestation = 5;
}
//vmp support
message FileHashes {
message Signature {
optional string filename = 1;
optional bool test_signing = 2; //0 - release, 1 - testing
optional bytes SHA512Hash = 3;
optional bool main_exe = 4; //0 for dlls, 1 for exe, this is field 3 in file
optional bytes signature = 5;
}
optional bytes signer = 1;
repeated Signature signatures = 2;
}

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// beware proto3 won't show missing fields it seems, need to change to "proto2" and add "optional" before every field, and remove all the dummy enum members I added:
syntax = "proto3";
// from x86 (partial), most of it from the ARM version:
message ClientIdentification {
enum TokenType {
KEYBOX = 0;
DEVICE_CERTIFICATE = 1;
REMOTE_ATTESTATION_CERTIFICATE = 2;
}
message NameValue {
string Name = 1;
string Value = 2;
}
message ClientCapabilities {
enum HdcpVersion {
HDCP_NONE = 0;
HDCP_V1 = 1;
HDCP_V2 = 2;
HDCP_V2_1 = 3;
HDCP_V2_2 = 4;
}
uint32 ClientToken = 1;
uint32 SessionToken = 2;
uint32 VideoResolutionConstraints = 3;
HdcpVersion MaxHdcpVersion = 4;
uint32 OemCryptoApiVersion = 5;
}
TokenType Type = 1;
//bytes Token = 2; // by default the client treats this as blob, but it's usually a DeviceCertificate, so for usefulness sake, I'm replacing it with this one:
SignedDeviceCertificate Token = 2;
repeated NameValue ClientInfo = 3;
bytes ProviderClientToken = 4;
uint32 LicenseCounter = 5;
ClientCapabilities _ClientCapabilities = 6; // how should we deal with duped names? will have to look at proto docs later
}
message DeviceCertificate {
enum CertificateType {
ROOT = 0;
INTERMEDIATE = 1;
USER_DEVICE = 2;
SERVICE = 3;
}
//ProvisionedDeviceInfo.WvSecurityLevel Type = 1; // is this how one is supposed to call it? (it's an enum) there might be a bug here, with CertificateType getting confused with WvSecurityLevel, for now renaming it (verify against other binaries)
CertificateType Type = 1;
bytes SerialNumber = 2;
uint32 CreationTimeSeconds = 3;
bytes PublicKey = 4;
uint32 SystemId = 5;
uint32 TestDeviceDeprecated = 6; // is it bool or int?
bytes ServiceId = 7; // service URL for service certificates
}
// missing some references,
message DeviceCertificateStatus {
enum CertificateStatus {
VALID = 0;
REVOKED = 1;
}
bytes SerialNumber = 1;
CertificateStatus Status = 2;
ProvisionedDeviceInfo DeviceInfo = 4; // where is 3? is it deprecated?
}
message DeviceCertificateStatusList {
uint32 CreationTimeSeconds = 1;
repeated DeviceCertificateStatus CertificateStatus = 2;
}
message EncryptedClientIdentification {
string ServiceId = 1;
bytes ServiceCertificateSerialNumber = 2;
bytes EncryptedClientId = 3;
bytes EncryptedClientIdIv = 4;
bytes EncryptedPrivacyKey = 5;
}
// todo: fill (for this top-level type, it might be impossible/difficult)
enum LicenseType {
ZERO = 0;
DEFAULT = 1; // do not know what this is either, but should be 1; on recent versions may go up to 3 (latest x86)
}
// todo: fill (for this top-level type, it might be impossible/difficult)
// this is just a guess because these globals got lost, but really, do we need more?
enum ProtocolVersion {
DUMMY = 0;
CURRENT = 21; // don't have symbols for this
}
message LicenseIdentification {
bytes RequestId = 1;
bytes SessionId = 2;
bytes PurchaseId = 3;
LicenseType Type = 4;
uint32 Version = 5;
bytes ProviderSessionToken = 6;
}
message License {
message Policy {
uint32 CanPlay = 1;
uint32 CanPersist = 2;
uint32 CanRenew = 3;
uint32 RentalDurationSeconds = 4;
uint32 PlaybackDurationSeconds = 5;
uint32 LicenseDurationSeconds = 6;
uint32 RenewalRecoveryDurationSeconds = 7;
string RenewalServerUrl = 8;
uint32 RenewalDelaySeconds = 9;
uint32 RenewalRetryIntervalSeconds = 10;
uint32 RenewWithUsage = 11;
uint32 UnknownPolicy12 = 12;
}
message KeyContainer {
enum KeyType {
_NOKEYTYPE = 0; // dummy, added to satisfy proto3, not present in original
SIGNING = 1;
CONTENT = 2;
KEY_CONTROL = 3;
OPERATOR_SESSION = 4;
}
enum SecurityLevel {
_NOSECLEVEL = 0; // dummy, added to satisfy proto3, not present in original
SW_SECURE_CRYPTO = 1;
SW_SECURE_DECODE = 2;
HW_SECURE_CRYPTO = 3;
HW_SECURE_DECODE = 4;
HW_SECURE_ALL = 5;
}
message OutputProtection {
enum CGMS {
COPY_FREE = 0;
COPY_ONCE = 2;
COPY_NEVER = 3;
CGMS_NONE = 0x2A; // PC default!
}
ClientIdentification.ClientCapabilities.HdcpVersion Hdcp = 1; // it's most likely a copy of Hdcp version available here, but compiler optimized it away
CGMS CgmsFlags = 2;
}
message KeyControl {
bytes KeyControlBlock = 1; // what is this?
bytes Iv = 2;
}
message OperatorSessionKeyPermissions {
uint32 AllowEncrypt = 1;
uint32 AllowDecrypt = 2;
uint32 AllowSign = 3;
uint32 AllowSignatureVerify = 4;
}
message VideoResolutionConstraint {
uint32 MinResolutionPixels = 1;
uint32 MaxResolutionPixels = 2;
OutputProtection RequiredProtection = 3;
}
bytes Id = 1;
bytes Iv = 2;
bytes Key = 3;
KeyType Type = 4;
SecurityLevel Level = 5;
OutputProtection RequiredProtection = 6;
OutputProtection RequestedProtection = 7;
KeyControl _KeyControl = 8; // duped names, etc
OperatorSessionKeyPermissions _OperatorSessionKeyPermissions = 9; // duped names, etc
repeated VideoResolutionConstraint VideoResolutionConstraints = 10;
}
LicenseIdentification Id = 1;
Policy _Policy = 2; // duped names, etc
repeated KeyContainer Key = 3;
uint32 LicenseStartTime = 4;
uint32 RemoteAttestationVerified = 5; // bool?
bytes ProviderClientToken = 6;
// there might be more, check with newer versions (I see field 7-8 in a lic)
// this appeared in latest x86:
uint32 ProtectionScheme = 7; // type unconfirmed fully, but it's likely as WidevineCencHeader describesit (fourcc)
bytes UnknownHdcpDataField = 8;
}
message LicenseError {
enum Error {
DUMMY_NO_ERROR = 0; // dummy, added to satisfy proto3
INVALID_DEVICE_CERTIFICATE = 1;
REVOKED_DEVICE_CERTIFICATE = 2;
SERVICE_UNAVAILABLE = 3;
}
//LicenseRequest.RequestType ErrorCode; // clang mismatch
Error ErrorCode = 1;
}
message LicenseRequest {
message ContentIdentification {
message CENC {
// bytes Pssh = 1; // the client's definition is opaque, it doesn't care about the contents, but the PSSH has a clear definition that is understood and requested by the server, thus I'll replace it with:
WidevineCencHeader Pssh = 1;
LicenseType LicenseType = 2; // unfortunately the LicenseType symbols are not present, acceptable value seems to only be 1
bytes RequestId = 3;
}
message WebM {
bytes Header = 1; // identical to CENC, aside from PSSH and the parent field number used
LicenseType LicenseType = 2;
bytes RequestId = 3;
}
message ExistingLicense {
LicenseIdentification LicenseId = 1;
uint32 SecondsSinceStarted = 2;
uint32 SecondsSinceLastPlayed = 3;
bytes SessionUsageTableEntry = 4;
}
CENC CencId = 1;
WebM WebmId = 2;
ExistingLicense License = 3;
}
enum RequestType {
DUMMY_REQ_TYPE = 0; // dummy, added to satisfy proto3
NEW = 1;
RENEWAL = 2;
RELEASE = 3;
}
ClientIdentification ClientId = 1;
ContentIdentification ContentId = 2;
RequestType Type = 3;
uint32 RequestTime = 4;
bytes KeyControlNonceDeprecated = 5;
ProtocolVersion ProtocolVersion = 6; // lacking symbols for this
uint32 KeyControlNonce = 7;
EncryptedClientIdentification EncryptedClientId = 8;
}
message ProvisionedDeviceInfo {
enum WvSecurityLevel {
LEVEL_UNSPECIFIED = 0;
LEVEL_1 = 1;
LEVEL_2 = 2;
LEVEL_3 = 3;
}
uint32 SystemId = 1;
string Soc = 2;
string Manufacturer = 3;
string Model = 4;
string DeviceType = 5;
uint32 ModelYear = 6;
WvSecurityLevel SecurityLevel = 7;
uint32 TestDevice = 8; // bool?
}
// todo: fill
message ProvisioningOptions {
}
// todo: fill
message ProvisioningRequest {
}
// todo: fill
message ProvisioningResponse {
}
message RemoteAttestation {
EncryptedClientIdentification Certificate = 1;
string Salt = 2;
string Signature = 3;
}
// todo: fill
message SessionInit {
}
// todo: fill
message SessionState {
}
// todo: fill
message SignedCertificateStatusList {
}
message SignedDeviceCertificate {
//bytes DeviceCertificate = 1; // again, they use a buffer where it's supposed to be a message, so we'll replace it with what it really is:
DeviceCertificate _DeviceCertificate = 1; // how should we deal with duped names? will have to look at proto docs later
bytes Signature = 2;
SignedDeviceCertificate Signer = 3;
}
// todo: fill
message SignedProvisioningMessage {
}
// the root of all messages, from either server or client
message SignedMessage {
enum MessageType {
DUMMY_MSG_TYPE = 0; // dummy, added to satisfy proto3
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
bytes Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
bytes SessionKey = 4; // often RSA wrapped for licenses
RemoteAttestation RemoteAttestation = 5;
}
// This message is copied from google's docs, not reversed:
message WidevineCencHeader {
enum Algorithm {
UNENCRYPTED = 0;
AESCTR = 1;
};
Algorithm algorithm = 1;
repeated bytes key_id = 2;
// Content provider name.
string provider = 3;
// A content identifier, specified by content provider.
bytes content_id = 4;
// Track type. Acceptable values are SD, HD and AUDIO. Used to
// differentiate content keys used by an asset.
string track_type_deprecated = 5;
// The name of a registered policy to be used for this asset.
string policy = 6;
// Crypto period index, for media using key rotation.
uint32 crypto_period_index = 7;
// Optional protected context for group content. The grouped_license is a
// serialized SignedMessage.
bytes grouped_license = 8;
// Protection scheme identifying the encryption algorithm.
// Represented as one of the following 4CC values:
// 'cenc' (AESCTR), 'cbc1' (AESCBC),
// 'cens' (AESCTR subsample), 'cbcs' (AESCBC subsample).
uint32 protection_scheme = 9;
// Optional. For media using key rotation, this represents the duration
// of each crypto period in seconds.
uint32 crypto_period_seconds = 10;
}
// from here on, it's just for testing, these messages don't exist in the binaries, I'm adding them to avoid detecting type programmatically
message SignedLicenseRequest {
enum MessageType {
DUMMY_MSG_TYPE = 0; // dummy, added to satisfy proto3
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
LicenseRequest Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
bytes SessionKey = 4; // often RSA wrapped for licenses
RemoteAttestation RemoteAttestation = 5;
}
message SignedLicense {
enum MessageType {
DUMMY_MSG_TYPE = 0; // dummy, added to satisfy proto3
LICENSE_REQUEST = 1;
LICENSE = 2;
ERROR_RESPONSE = 3;
SERVICE_CERTIFICATE_REQUEST = 4;
SERVICE_CERTIFICATE = 5;
}
MessageType Type = 1; // has in incorrect overlap with License_KeyContainer_SecurityLevel
License Msg = 2; // this has to be casted dynamically, to LicenseRequest, License or LicenseError (? unconfirmed), for Request, no other fields but Type need to be present
// for SERVICE_CERTIFICATE, only Type and Msg are present, and it's just a DeviceCertificate with CertificateType set to SERVICE
bytes Signature = 3; // might be different type of signatures (ex. RSA vs AES CMAC(??), unconfirmed for now)
bytes SessionKey = 4; // often RSA wrapped for licenses
RemoteAttestation RemoteAttestation = 5;
}

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pywidevine/cdm/key.py Normal file
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import binascii
class Key:
def __init__(self, kid, type, key, permissions=[]):
self.kid = kid
self.type = type
self.key = key
self.permissions = permissions
def __repr__(self):
if self.type == "OPERATOR_SESSION":
return "key(kid={}, type={}, key={}, permissions={})".format(self.kid, self.type, binascii.hexlify(self.key), self.permissions)
else:
return "key(kid={}, type={}, key={})".format(self.kid, self.type, binascii.hexlify(self.key))

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pywidevine/cdm/session.py Normal file
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class Session:
def __init__(self, session_id, init_data, device_config, offline):
self.session_id = session_id
self.init_data = init_data
self.offline = offline
self.device_config = device_config
self.device_key = None
self.session_key = None
self.derived_keys = {
'enc': None,
'auth_1': None,
'auth_2': None
}
self.license_request = None
self.license = None
self.service_certificate = None
self.privacy_mode = False
self.keys = []

102
pywidevine/cdm/vmp.py Normal file
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try:
from google.protobuf.internal.decoder import _DecodeVarint as _di # this was tested to work with protobuf 3, but it's an internal API (any varint decoder might work)
except ImportError:
# this is generic and does not depend on pb internals, however it will decode "larger" possible numbers than pb decoder which has them fixed
def LEB128_decode(buffer, pos, limit = 64):
result = 0
shift = 0
while True:
b = buffer[pos]
pos += 1
result |= ((b & 0x7F) << shift)
if not (b & 0x80):
return (result, pos)
shift += 7
if shift > limit:
raise Exception("integer too large, shift: {}".format(shift))
_di = LEB128_decode
class FromFileMixin:
@classmethod
def from_file(cls, filename):
"""Load given a filename"""
with open(filename,"rb") as f:
return cls(f.read())
# the signatures use a format internally similar to
# protobuf's encoding, but without wire types
class VariableReader(FromFileMixin):
"""Protobuf-like encoding reader"""
def __init__(self, buf):
self.buf = buf
self.pos = 0
self.size = len(buf)
def read_int(self):
"""Read a variable length integer"""
# _DecodeVarint will take care of out of range errors
(val, nextpos) = _di(self.buf, self.pos)
self.pos = nextpos
return val
def read_bytes_raw(self, size):
"""Read size bytes"""
b = self.buf[self.pos:self.pos+size]
self.pos += size
return b
def read_bytes(self):
"""Read a bytes object"""
size = self.read_int()
return self.read_bytes_raw(size)
def is_end(self):
return (self.size == self.pos)
class TaggedReader(VariableReader):
"""Tagged reader, needed for implementing a WideVine signature reader"""
def read_tag(self):
"""Read a tagged buffer"""
return (self.read_int(), self.read_bytes())
def read_all_tags(self, max_tag=3):
tags = {}
while (not self.is_end()):
(tag, bytes) = self.read_tag()
if (tag > max_tag):
raise IndexError("tag out of bound: got {}, max {}".format(tag, max_tag))
tags[tag] = bytes
return tags
class WideVineSignatureReader(FromFileMixin):
"""Parses a widevine .sig signature file."""
SIGNER_TAG = 1
SIGNATURE_TAG = 2
ISMAINEXE_TAG = 3
def __init__(self, buf):
reader = TaggedReader(buf)
self.version = reader.read_int()
if (self.version != 0):
raise Exception("Unsupported signature format version {}".format(self.version))
self.tags = reader.read_all_tags()
self.signer = self.tags[self.SIGNER_TAG]
self.signature = self.tags[self.SIGNATURE_TAG]
extra = self.tags[self.ISMAINEXE_TAG]
if (len(extra) != 1 or (extra[0] > 1)):
raise Exception("Unexpected 'ismainexe' field value (not '\\x00' or '\\x01'), please check: {0}".format(extra))
self.mainexe = bool(extra[0])
@classmethod
def get_tags(cls, filename):
"""Return a dictionary of each tag in the signature file"""
return cls.from_file(filename).tags

0
pywidevine/decrypt/__init__.py Normal file
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52
pywidevine/decrypt/wvdecrypt.py Normal file
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import logging
import subprocess
import re
from tqdm import tqdm
import base64
from pywidevine.cdm import cdm, deviceconfig
class WvDecrypt(object):
WV_SYSTEM_ID = [237, 239, 139, 169, 121, 214, 74, 206, 163, 200, 39, 220, 213, 29, 33, 237]
def __init__(self, PSSH):
self.logger = logging.getLogger(__name__)
self.wvdecrypt_process = None
self.pssh = PSSH
self.cdm = cdm.Cdm()
def check_pssh(pssh_b64):
pssh = base64.b64decode(pssh_b64)
if not pssh[12:28] == bytes(self.WV_SYSTEM_ID):
new_pssh = bytearray([0,0,0])
new_pssh.append(32+len(pssh))
new_pssh[4:] = bytearray(b'pssh')
new_pssh[8:] = [0,0,0,0]
new_pssh[13:] = self.WV_SYSTEM_ID
new_pssh[29:] = [0,0,0,0]
new_pssh[31] = len(pssh)
new_pssh[32:] = pssh
return base64.b64encode(new_pssh)
else:
return pssh_b64
self.session = self.cdm.open_session(check_pssh(self.pssh),
deviceconfig.DeviceConfig(deviceconfig.device_nexus6_lvl1))
def start_process(self):
keyswvdecrypt=[]
keys = self.cdm.get_keys(self.session)
for key in keys:
if key.type == 'CONTENT':
keyswvdecrypt.append(('{}:{}'.format(key.kid.hex(), key.key.hex())))
return keyswvdecrypt
def get_challenge(self):
return self.cdm.get_license_request(self.session)
def update_license(self, license_b64):
self.cdm.provide_license(self.session, license_b64)
return True

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pywidevine/decrypt/wvdecryptconfig.py Normal file
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import pywidevine.downloader.wvdownloaderconfig as wvdl_cfg
class WvDecryptConfig(object):
def __init__(self, filename, tracktype, trackno, license, init_data_b64, cert_data_b64=None):
self.filename = filename
self.tracktype = tracktype
self.trackno = trackno
self.init_data_b64 = init_data_b64
self.license = license
if cert_data_b64 is not None:
self.server_cert_required = True
self.cert_data_b64 = cert_data_b64
else:
self.server_cert_required = False
def get_filename(self, unformatted_filename):
return unformatted_filename.format(filename=self.filename, track_type=self.tracktype, track_no=self.trackno)
def build_commandline_list(self, keys):
commandline = [wvdl_cfg.MP4DECRYPT_BINARY_PATH]
for key in keys:
if key.type == 'CONTENT':
commandline.append('--key')
commandline.append('{}:{}'.format(key.kid.hex(), key.key.hex()))
commandline.append(self.get_filename(wvdl_cfg.ENCRYPTED_FILENAME))
commandline.append(self.get_filename(wvdl_cfg.DECRYPTED_FILENAME))
return commandline