Decryption-Tools/pywidevine
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PSSH: Allow crafting v0 boxes with just Key IDs

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This is actually possible and in some cases necessary. While v0 boxes do not use key_IDs field of the PSSH Box, we can store the provided key_ids in the init data. E.g., Apple Music.
This commit is contained in:
rlaphoenix 2022-08-05 08:31:14 +01:00
parent 27a701aaea
commit 26d81a7bef
1 changed files with 6 additions and 5 deletions
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11
pywidevine/pssh.py
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@ -126,11 +126,9 @@ class PSSH:
if flags < 0:
raise ValueError(f"Invalid flags, cannot be less than 0.")
if version == 0:
if key_ids is not None:
raise ValueError("Version 0 PSSH boxes must use init_data only, not key_ids.")
if init_data is None:
raise ValueError("Version 0 PSSH boxes must use init_data but it wasn't provided.")
if version == 0 and key_ids is not None and init_data is not None:
# v0 boxes use only init_data in the pssh field, but we can use the key_ids within the init_data
raise ValueError("Version 0 PSSH boxes must use only init_data, not init_data and key_ids.")
elif version == 1:
# TODO: I cannot tell if they need either init_data or key_ids exclusively, or both is fine
# So for now I will just make sure at least one is supplied
@ -177,6 +175,9 @@ class PSSH:
init_data=[init_data, b""][init_data is None]
)))
if key_ids and version == 0:
PSSH.overwrite_key_ids(box, [UUID(bytes=x) for x in key_ids])
return cls(box)
@classmethod