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Cdm: Fix size and Improve code of Android Session IDs

This commit is contained in:
rlaphoenix 2022-07-20 21:40:40 +01:00
parent e9e65e5760
commit 53f7c1dd62
1 changed files with 3 additions and 6 deletions
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9
pywidevine/cdm.py
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@ -257,12 +257,9 @@ class Cdm:
def create_session_id(self, device: Device) -> bytes:
"""Create a Session ID based on OEM Crypto API session values."""
if device.type == device.Types.ANDROID:
session_id = "{hex:16X}{counter}".format(
hex=random.getrandbits(64),
counter=f"{self.NUM_OF_SESSIONS:02}"
)
session_id.ljust(32, "0")
return session_id.encode("ascii")
# Note: this reversing is quite old and needs verifying in later OEM Crypto versions like 16
# though ultimately it shouldn't really matter
return get_random_bytes(8) + self.NUM_OF_SESSIONS.to_bytes(8, "little")
if device.type == device.Types.CHROME:
return get_random_bytes(16)