Wrong PSSH?

[Caidking]

Hi,

MPD:

https://svc40.main.ak.t-online.de/LCID3221228428.originalserver.prod.sngtv.t-online.de/PLTV/88888888/224/3221228428/3221228428.mpd

License Server:

https://vmxdrmfklb1.sfm.t-online.de:8063/

I got the following PSSH:

CAESEA7Llkv3eXVfs1IlXXX10h8aFG1hZ3lhcnRlbGVjb21nZXJtYW55Ig5yPTUyMTA0MyZzPTk1NSoFU0RfSEQ=

Is this PSSH correct? I can't get a master key for it. Various tools show an error.

[lomero]

wrong pssh. try this

AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEKmL7+3Wec5Ko8gn3NUdIe0=

[Caidking]

wrong pssh. try this

AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEKmL7+3Wec5Ko8gn3NUdIe0=

how you got this?
Did you can get the master-key for that?

[lomero]

from your mpd. ede

[Caidking]

from your mpd. ede

And which way you used?
Did you got the master key as well?

[Caidking]

push

[A_n_g_e_l_a]

push

Helpful isn't he, Lomero?


[Attachment 67279 - Click to enlarge]

Display the results from the mpd. I use curl 'mpd-url'. Or put it in a browser. Select the highlighted UUID - note the full line at the end says Widevine.
Then decode with a python routine. I took this from part of a Notaghost program so thanks to Ghost we have this:-

import base64

def get_pssh(keyId):
    array_of_bytes = bytearray( b'\x00\x00\x002pssh\x00\x00\x00\x00')
    array_of_bytes.extend(bytes.fromhex("edef8ba979d64acea3c827dcd51d21ed"))
    array_of_bytes.extend(b'\x00\x00\x00\x12\x12\x10')
    array_of_bytes.extend(bytes.fromhex( keyId.replace("-", "")))
    return base64.b64encode(bytes.fromhex(array_of_bytes.hex()))

kid = input("Please input KID in hex string: ")
kid = kid.replace('-', '')
assert len(kid) == 32 and not isinstance(kid, bytes), "wrong KID length"
print("PSSH {}".format(get_pssh(kid).decode('utf-8')))

When run the above routine produces:-

PSSH AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEO3vi6l51krOo8gn3NUdIe0=

which should match what whatshisface said,

I cannot check it works as I am geo-locked.

[bamboobali]

Caidking, to start with I have to mention that I've only recently started looking at this whole topic and the more I learn, the more I discover that I don't know. With that said, to the best of my knowledge a genuine pssh will always start with 4 'A's.

The characters you posted start with 'CAES', characters which, incidentally, I have only ever seen being sent to (not from) a license server, but like I said, I haven't been looking for long.

My sums could be wrong of course, but the reason I think the pssh will always start with 4 'A's is because the first 4 bytes of the decoded pssh seem to represent its length, and since the length is relatively short (below 0xFF), the first 3 of those bytes are always 0x00, and if you b64 encoded 3 '0x00's you get 4 'A's.

I thought this post from ridibunda was very helpful: https://forum.videohelp.com/threads/404586-how-to-work-out-the-pssh-when-not-shown-in-...pd#post2649666

If the pssh from lomero is correct, and if indeed the pssh was generated from the mpd file, then you should see a KID of: a98befed-d679ce4a-a3c827dc-d51d21ed in there somewhere.