unable to extract keys from license response

[PETA]

headers = {
    'accept': '*/*',
    'accept-language': 'en-US,en;q=0.9',
    'token': '<fastly expiring drm token >',
    'sec-ch-ua': '"Not_A Brand";v="8", "Chromium";v="120", "Google Chrome";v="120"',
    'sec-ch-ua-mobile': '?0',
    'sec-ch-ua-platform': '"Windows"',
    'sec-fetch-dest': 'empty',
    'sec-fetch-mode': 'cors',
    'sec-fetch-site': 'cross-site',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
    'content-type': 'application/x-www-form-urlencoded',
}

data = '<browser cdm data>'

[Attachment 76474 - Click to enlarge]
License url,
There is only 2 license requests (Method: OPTIONS and Method: POST).
Only browser cdm data in the payload ( no widevineChallenge or any other data in the payload).

[Attachment 76473 - Click to enlarge]


with pywidevine
Error:

500 internal server error

I'm able to get the license response with WKS-KEYS

 widevine_license = requests.post(url=lic_url, data=wvdecrypt.get_challenge(), headers=headers, proxies=proxies, auth=proxy_auth)

License Response:

CAIS.................................

but I can't extract the decryption keys from license response received from the License Server.
I need help with this process.

tried ,

 
    license_b64 = b64encode(widevine_license.content)
    wvdecrypt.update_license(license_b64)
    Correct, keyswvdecrypt = wvdecrypt.start_process()
    if Correct:
        return Correct, keyswvdecrypt   
correct, keys = WV_Function(pssh, lic_url)

Error:

unable to parse license - check protobufs

protobufs==3.19.5

[jckzz]

usually this error due to headers problem

unable to parse license - check protobufs

share video url

[white_snake]

Try removing everything from the headers except the 'token'.

[PETA]

didnt work. still unable to phrase

[Attachment 76484 - Click to enlarge]

def WV_Function(pssh, lic_url, cert_b64=None):
    wvdecrypt = WvDecrypt(init_data_b64=pssh, cert_data_b64=cert_b64, device=deviceconfig.device_android_generic)
    widevine_license = requests.post(url=lic_url, data=wvdecrypt.get_challenge(), headers=headers, proxies=proxies, auth=proxy_auth)

    print(f"\n[+] License Request: {widevine_license.request.body}")
    print(f"\n[+] License Response: {widevine_license.content}")
    license_b64 = b64encode(widevine_license.content)
    wvdecrypt.update_license(license_b64)
    Correct, keyswvdecrypt = wvdecrypt.start_process()
    if Correct:
        return Correct, keyswvdecrypt   
correct, keys = WV_Function(pssh, lic_url)

print()
for key in keys:
    print('--key ' + key)

[Karoolus]

Share the video URL so other people can try and see what needs to be done

[PETA]

pm i can send access to video

[ElCap]

didnt work. still unable to phrase

[Attachment 76484 - Click to enlarge]

def WV_Function(pssh, lic_url, cert_b64=None):
    wvdecrypt = WvDecrypt(init_data_b64=pssh, cert_data_b64=cert_b64, device=deviceconfig.device_android_generic)
    widevine_license = requests.post(url=lic_url, data=wvdecrypt.get_challenge(), headers=headers, proxies=proxies, auth=proxy_auth)

    print(f"\n[+] License Request: {widevine_license.request.body}")
    print(f"\n[+] License Response: {widevine_license.content}")
    license_b64 = b64encode(widevine_license.content)
    wvdecrypt.update_license(license_b64)
    Correct, keyswvdecrypt = wvdecrypt.start_process()
    if Correct:
        return Correct, keyswvdecrypt   
correct, keys = WV_Function(pssh, lic_url)

print()
for key in keys:
    print('--key ' + key)

Your response is already in base64 so you just need a slight modification to your code
replace this:

license_b64 = b64encode(widevine_license.content)

with this:

license_b64 = widevine_license.content

(or if that doesnt work, try this)

license_b64 = widevine_license.text

[PETA]

Thanks it worked !

removed everything from the headers except the 'token'
replaced

license_b64 = widevine_license.content