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Decrypt AES-128 encrypted video files from a m3u8

(http://stream-recorder.com/forum/showthread.php?t=18317)

chap	05-24-2014 01:51 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by Nopt (Post 67801)

The answer indeed lies in the original source page :)
And since you like python :

Code:

import base64

from Crypto.Cipher import Blowfish

key = "Rev3rseEngIneeringIsN0tLeGal" #~ As if ;)

aes = Blowfish.new(key, Blowfish.MODE_ECB)

d = "e2f96a0861cb381a8b52801f18bf04924c3472bc8f319930"

d = d.decode("hex")

d = aes.decrypt(d)

d = base64.b64decode(d)

return d

what it looks like in PHP?

Dune	05-24-2014 03:07 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by gaaara (Post 67800)

seems to be the language ruby code was in a file. rb

you speek french Dune ?

Indeed I do, we're quite a bunch of french people being concerned by this :)

Quote:

Originally Posted by Nopt (Post 67801)

The answer indeed lies in the original source page :)
And since you like python :

Code:

import base64

from Crypto.Cipher import Blowfish

key = "Rev3rseEngIneeringIsN0tLeGal" #~ As if ;)

aes = Blowfish.new(key, Blowfish.MODE_ECB)

d = "e2f96a0861cb381a8b52801f18bf04924c3472bc8f319930"

d = d.decode("hex")

d = aes.decrypt(d)

d = base64.b64decode(d)

return d

Thank you very much for the Python port! I'm gonna try this ASAP.

Nopt	05-24-2014 03:23 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by Dune (Post 67805)

Thank you very much for the Python port! I'm gonna try this ASAP.

I'm not sure what you mean by "port", it has nothing to do with the earlier ruby code (which only handle a classic HLS stream)
My code specifically and only address the problem of the encrypted .key file. (it even includes the secret - well not that secret anymore ;) - key !)

If you want a python port of the ruby code (to dump a classic HLS stream like ffmpeg would do) it's more like that :

Code:

import m3u8

from Crypto.Cipher import AES

f = open('file.ts','rb')

playlist = m3u8.loads(playlist) 

key = urllib2.urlopen(playlist.key.uri).read() # <- swap that line with my earlier snippet to handle encrypted keys

iv = ('%x' % int(playlist.key.iv,16)).decode("hex")

aes = AES.new(key, AES.MODE_CBC, iv)

for x in playlist.segments :

        r = urllib2.urlopen(x.uri)

        d = r.read()

        d = aes.decrypt(d)

        f.write(d)

f.close()

Spyne

05-24-2014 03:38 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Can you explain how you find this key ?

Dune	05-24-2014 03:50 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by Nopt (Post 67807)

Code:

import m3u8

from Crypto.Cipher import AES

f = open('file.ts','rb')

playlist = m3u8.loads(playlist) 

key = urllib2.urlopen(playlist.key.uri).read() # <- swap that line with my earlier snippet to handle encrypted keys

iv = ('%x' % int(playlist.key.iv,16)).decode("hex")

aes = AES.new(key, AES.MODE_CBC, iv)

for x in playlist.segments :

        r = urllib2.urlopen(x.uri)

        d = r.read()

        d = aes.decrypt(d)

        f.write(d)

f.close()

Oh I'm sorry I didn't look too puch into the Ruby code and thought all you did was porting.

Thank you a HUGE lot for your investment!
I just tested it, and it works!!! It is going to help a lot of us, that's for sure :)

Dat key though :D

Huge thanks again!

Edit: as Spyne said, it would help us a bunch in the future if you could give a few directions&tip as to how to get this key.

CereFR

05-24-2014 04:09 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

You can access the key with every sniffer you can find on the net (personally I use Coojah). But take care to the banishment ! The criteria change weekly, they are still programming their system, then we never know when it changes.

I suggest to focus on the key we have to decrypt, because surrounding stuff can be solved with Google ;) .

Nopt	05-24-2014 04:14 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by Dune (Post 67809)

Edit: as Spyne said, it would help us a bunch in the future if you could give a few directions&tip as to how to get this key.

Well hint n°1 : the browser always know the key (or anything of that kind for that matter)
hint n°2 : everything the browser executes is basically plain text (or not so far from it)
hint n°3 : it's in the HLSProvider6.0.2.swf file :p

Dune	05-24-2014 04:34 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Quote:

Originally Posted by CereFR (Post 67810)

Downloading the .key file really is no hard task... it's more about the way to decrypt it. You need another "key" ;)

Quote:

Originally Posted by Nopt (Post 67811)

Trying that on my own atm, thanks for the hints!

Dune	05-24-2014 04:44 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

Alright, I've looked into the .swf file, but I can't find anything there; what would you use track the execution/use of that file (or of the player in general)?

Damn I'm feeling incompetent now :/

gaaara

05-24-2014 05:35 PM

Re: Decrypt AES-128 encrypted video files from a m3u8

how to use this for download video ?

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