5.8 KiB
Purpose of this project
Hello everyone! Hope all is good. I've spent the past few months scouring pages just to try and get decryption keys for widevine content. There was no clear instructions on the internet and the instructions that are there need pieced togther for a proper result. What I've tried to do is condense these fragments down to a cohesive guide for people to follow. If you have any questions feel free to message me on here, my reddit and discord, Contact informatoin can be found on my profile
Prerequisites
I used all the mentioned tools on windows 10 x64, please install all of the
Python 3.10.2 Make sure to check "add to path" option when installing.
A (preferably non samsung) Android 7-9 (possibly Android 10) device that is able to be rooted and bonus points for bootloader unlocked
What I used
Truewell T95 S1 I'ts pre-rooted, and I know I could dump the keys from it from previous users success, and it's only around $30 USD, much cheaper than what you'll get secondhand and have to be worried about everything going right, but like I said in the previous section, the selection of what should work is pretty large so if you have a spare device you can avoid this cost.
IF YOU DO USE YOUR OWN ANDROID DEVICE YOU MUST INSTALL MAGISK AND THE FRIDA-SERVER MODULE
You can find the installation instructions for magisk here and the frida module here.
Step 1: Preparing CDM
Connect to your android device via ADB, on the T95 this is enable by default over wifi. Other devices may vary.
To enable ADB / USB Debugging follow these steps
- Open your device's Settings and tap About phone or About tablet.
- Tap Build number repeatedly until you see a notification that reads "You are now a developer."
- Go back to the main System menu, then tap Developer options.
- Tap the toggle switch in the top-right corner to enable developer options (if it's not already enabled).
- Tap OK to confirm.
- Tap the USB debugging toggle switch.
- Tap OK to confirm.
- The next time you plug your device into a computer, you'll receive a prompt asking if you want to authorize USB debugging for that computer. Tap OK to confirm.
You may now connect to your device
adb connect <box-ip-address>
or if using USB just use
adb devices
On your device you should receive a notificatoin to accept the adb connection, checkmark trust this device and then click allow.
IF YOU HAVE MAGISK-FRIDA MODULE INSTALLED YOU MAY SKIP TO THE NEXT STEP
Let's go ahead and push frida-server to the Android device, for the T95 S1 I used Frida-Server 15.1.17 for android. Unnzip the xz file and extract Frida-Server file.
Change directory to where you extracted the file and enter the commandadb push frida-server-15.1.17-android-arm /sdcard/
Once it has been pushed open up a shell with adb shell
Move the server so it can be run mv /sdcard/fridaserver-15.1.17-android-arm /data/local/tmp/
You may get an error about chwon permission, this is negligible
Login as super user and clear any user environment variables active by including a hyphen after su su -
Give execute privileges to frida-server chmod +x /data/local/tmp/fridaserver-15.1.17-android-arm
Start the server /data/local/tmp/fridaserver-15.1.17-android-arm
When you start the server command prompt will hang, this is normal and means the program is running, do not close out and continue to step 2
Step 2: Extracting the CDM
If you would like to check if frida-server is running connect via adb to your device in new command prompt like in step one, then use adb shell and then su and then ps | grep frida this should show you the process running, if it does not something went wrong
Download and extract Dumper
Open a new command prompt as administrator and change directories to the newly extracted folder and run pip3 install -r requirements.txt and once that's finished, start the program with python dump_keys.py
Now play some widevine encrpyed content. I suggest using https://bitmovin.com/demos/drm playing over google chrome.
Side note: on the T95 S1 I had to stop and start dumper a few times and rebooted the device a few times, sometimes it does take some effort for it to dump the keys
Once you have played the content your keys should be dumped in the dumper folder under /key-dumps/your-device-keys/xxxx/xxxxxxxx/ and should be named client_id.bin and private_key.pem
Make a copy of these for safekeeping wherever you like but DO NOT LOSE THEM
Make sure to have file extensions visible on windows, this can be turned on by searching "show file extensions" in the windows search bar.
Now we will rename these files, clent_id.bin to device_client_id_blob. and rename private_key.pem to device_private_key. The periods on the end is intentional as windows likes to keep file extentions, please make sure to have this exact or it will cause errors with downey! Only rename with windows, using a program such as text editor and saving under all files will still corrupt the data!