truedread / pymp4decrypt Goto Github PK

Audio doesn't have explicit cipher/clear bytes, so the sample sizes are defined in the stsz box. The decrypter needs to be updated to make use of it.

C:\Users\Suporte\Downloads\pymp4decrypt-master\src>python decrypt.py -k 4ce68c303ae037a59888d4866de39ffb -i C:\Users\Suporte\Downloads\pymp4decrypt-master\Blank.mp4 -o C:\Users\Suporte\Downloads\pymp4decrypt-master\Blank2.mp4
Traceback (most recent call last):
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 1089, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 1089, in
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymp4-1.1.0-py3.7.egg\pymp4\parser.py", line 46, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 855, in _parse
AttributeError: 'bytes' object has no attribute 'items'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 2696, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 1093, in _parse
construct.core.RangeError: could not read prefix or enough elements, stream too short?

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "decrypt.py", line 131, in
main()
File "decrypt.py", line 50, in main
decrypt(args.key, args.input, args.output)
File "decrypt.py", line 83, in decrypt
box = Box.parse_stream(reader)
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 186, in parse_stream
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\pymp4-1.1.0-py3.7.egg\pymp4\parser.py", line 46, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 855, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 297, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 1544, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 859, in _parse
File "C:\Users\Suporte\AppData\Local\Programs\Python\Python37-32\lib\site-packages\construct-2.8.8-py3.7.egg\construct\core.py", line 2700, in _parse
construct.core.RangeError: could not read prefix or enough elements, stream too short?
parsing -> entries

too many errors
fix one , comes another one

PIFF encrypted MP4s use UUIDs for box names instead of the normal type names (tenc, senc, pssh), so the decrypter would need to be updated to map each UUID to the box. Fortunately, pymp4 already supports parsing the PIFF boxes (at least on my fork).

"When a 16 byte Per_Sample_IV_Size is indicated and the least significant 8 bytes (64 bit counter) reaches the maximum value (0xFFFFFFFFFFFFFFFF), then incrementing it SHALL reset the 8 byte block counter to zero (bytes 8 to 15) without affecting the other 8 bytes of the counter (bytes 0 to 7)" (ISO/IEC 23001-7:2016).

The decrypter is assuming all IV sizes are set to 8 and is not reading the value for the actual IV size, so something with an IV size of 16 would fail.

https://hastebin.com/vufigiwese.sql

suporte@SUP-13:~/pymp4decrypt/src$ python decrypt.py -k 4ce68c303ae037a59888d4866de39ffb -i ~/Blank\ -\ A\ Vinylmation\ Love\ Story-FitJ3hgxiAg.mp4 -o ~/Blank.mp4
Traceback (most recent call last):
File "decrypt.py", line 131, in
main()
File "decrypt.py", line 50, in main
decrypt(args.key, args.input, args.output)
File "decrypt.py", line 78, in decrypt
with BufferedReader(inp) as reader:
AttributeError: 'file' object has no attribute 'readable'