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MSLMediaDrm.py
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MSLMediaDrm.py
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from os import urandom
import json
import base64
import xbmcdrm
class MSLMediaDrmCrypto:
def __init__(self, kodi_helper):
self.kodi_helper = kodi_helper
self.keySetId = None
self.keyId = None
self.hmacKeyId = None
try:
self.cryptoSession = xbmcdrm.CryptoSession('edef8ba9-79d6-4ace-a3c8-27dcd51d21ed',
'AES/CBC/NoPadding', 'HmacSHA256')
self.kodi_helper.log(msg='Widevine CryptoSession successful constructed')
except:
self.cryptoSession = None
return
self.systemId = self.cryptoSession.GetPropertyString('systemId')
self.kodi_helper.log(msg='Widevine CryptoSession systemId:' + self.systemId)
algorithms = self.cryptoSession.GetPropertyString('algorithms')
self.kodi_helper.log(msg='Widevine CryptoSession algorithms:' + algorithms)
def __del__(self):
self.cryptoSession = None
def __getKeyRequest(self, data):
#No key update supported -> remove existing keys
self.cryptoSession.RemoveKeys()
keyRequest = self.cryptoSession.GetKeyRequest(data, 'application/xml', True, dict())
if keyRequest:
self.kodi_helper.log(msg='Widevine CryptoSession getKeyRequest successful with size:'
+ str(len(keyRequest)))
return keyRequest
else:
self.kodi_helper.log(msg='Widevine CryptoSession getKeyRequest failed!')
def __provideKeyResponse(self, data):
if len(data) == 0:
return false
self.keySetId = self.cryptoSession.ProvideKeyResponse(bytearray(data))
if self.keySetId:
self.kodi_helper.log(msg='Widevine CryptoSession provideKeyResponse successful, keySetId:'
+ self.keySetId)
else:
self.kodi_helper.log(msg='Widevine CryptoSession provideKeyResponse failed!')
self.keySetId = self.keySetId.encode()
return self.keySetId != None
def toDict(self):
self.kodi_helper.log(msg='Provide Widevine keys to dict')
data = {
"key_set_id": base64.standard_b64encode(self.keySetId).decode('ascii'),
'key_id': base64.standard_b64encode(self.keyId).decode('ascii'),
'hmac_key_id': base64.standard_b64encode(self.hmacKeyId).decode('ascii')
}
return data
def fromDict(self, msl_data):
need_handshake = False
if not self.cryptoSession:
return False
try:
self.kodi_helper.log(msg='Parsing Widevine keys from Dict')
self.keySetId = base64.standard_b64decode(msl_data['key_set_id'])
self.keyId = base64.standard_b64decode(msl_data['key_id'])
self.hmacKeyId = base64.standard_b64decode(msl_data['hmac_key_id'])
self.cryptoSession.RestoreKeys(self.keySetId)
except:
need_handshake = True
return need_handshake
def get_key_request(self):
drmKeyRequest = self.__getKeyRequest(bytearray([10, 122, 0, 108, 56, 43]))
key_request = [{
'scheme': 'WIDEVINE',
'keydata': {
'keyrequest': base64.standard_b64encode(drmKeyRequest).decode('ascii')
}
}]
return key_request
def parse_key_response(self, headerdata):
# Init Decryption
key_resonse = base64.standard_b64decode(headerdata['keyresponsedata']['keydata']['cdmkeyresponse'])
if not self.__provideKeyResponse(key_resonse):
return
self.keyId = base64.standard_b64decode(headerdata['keyresponsedata']['keydata']['encryptionkeyid'])
self.hmacKeyId = base64.standard_b64decode(headerdata['keyresponsedata']['keydata']['hmackeyid'])
def decrypt(self, iv, data):
decrypted = self.cryptoSession.Decrypt(bytearray(self.keyId), bytearray(data), bytearray(iv))
if decrypted:
self.kodi_helper.log(msg='Widevine CryptoSession decrypt successful: '
+ str(len(decrypted)) + ' bytes returned')
# remove PKCS5Padding
pad = decrypted[len(decrypted) - 1]
return decrypted[:-pad].decode('utf-8')
else:
self.kodi_helper.log(msg='Widevine CryptoSession decrypt failed!')
def encrypt(self, data, esn, sequence_number):
iv = bytearray(urandom(16))
# Add PKCS5Padding
pad = 16 - len(data) % 16
newData = data + ''.join([chr(pad)] * pad)
encrypted = self.cryptoSession.Encrypt(bytearray(self.keyId), newData, iv)
if encrypted:
self.kodi_helper.log(msg='Widevine CryptoSession encrypt successful: '
+ str(len(encrypted)) + ' bytes returned')
encryption_envelope = {
'version' : 1,
'ciphertext': base64.standard_b64encode(encrypted).decode('ascii'),
'sha256': 'AA==',
'keyid': base64.standard_b64encode(self.keyId).decode('ascii'),
#'cipherspec' : 'AES/CBC/PKCS5Padding',
'iv': base64.standard_b64encode(iv).decode('ascii')
}
return encryption_envelope
else:
self.kodi_helper.log(msg='Widevine CryptoSession encrypt failed!')
def sign(self, message):
signature = self.cryptoSession.Sign(bytearray(self.hmacKeyId), bytearray(message))
if signature:
self.kodi_helper.log(msg='Widevine CryptoSession sign success: length:'
+ str(len(signature)))
return signature
else:
self.kodi_helper.log(msg='Widevine CryptoSession sign failed!')
def verify(self, message, signature):
return self.cryptoSession.Verify(bytearray(self.hmacKeyId), bytearray(message), bytearray(signature))