this post was submitted on 05 Jul 2023
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Unofficial community about microG, a free-as-in-freedom re-implementation of Google's proprietary Android user space apps and libraries.

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Use a Python Script to Verify the Signature (discuss.tchncs.de)
submitted 1 year ago by [email protected] to c/[email protected]
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Dear MicroG

The instructions https://lineage.microg.org/ say

Before installing the ZIP you should check that it has the correct signature. You have to use a Python script to verify the signature, available here. Install Python 3 (if not already done) and the required packages (as explained in the README), then run:

python3 update_verifier.py lineageos4microg_pubkey lineage-microG.zip

I have no experience of verifying signatures.

I have no experience of python.

I think I have downloaded and installed Python 3 correctly.

I have downloaded the microG zip.

Could you talk me through the steps to check the signature please ?

In case it's important - I am using macOS 10.13

Yours sincerely ROMMMELLL

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[–] [email protected] 2 points 1 year ago* (last edited 1 year ago) (1 children)

As already mentioned in your former post, this is just to verify the integrity of the files. It's not a neccessary step, but could safe you from a bricked phone.

I think I have downloaded and installed Python 3 correctly.

To find out just open the App Terminal and type python3 and hit return. Your should see something like this

Python 3.11.3 (main, Apr  5 2023, 15:52:25) [GCC 12.2.1 20230201] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>>

Download the python script from the mentioned location: Green "<> Code" button > Download Zip. Unzip that stuff.

Open the Terminal again and cd into that folder. Then type

python3 update_verifier.py lineageos4microg_pubkey /path/on/your/machine/lineage-18.1-20230614-microG-jfltexx.zip

and see

verified successfully

[–] [email protected] 2 points 1 year ago (1 children)

Dear K

I opened the Terminal and typed python3 and hit return and saw something like what you have written above, so it seems I have successfully installed Python3, thankyou.

I went to https://github.com/lineageos4microg/update_verifier and clicked the green code button. I clicked on Download Zip. update_verifier-master.zip appeared in my Downloads. I double clicked on this and a blue folder titled update_verifier-master appeared.

I think the next step is to Open the Terminal again and cd into that folder.

BUT I am stuck at this point because I don't know what "cd into that folder" means, or how to do it.

Could you elucidate ?

Yours sincerely ROMMMELLL

[–] [email protected] 3 points 1 year ago* (last edited 1 year ago) (1 children)

cd means change directory. Its a CLI (Terminal) tool to - as the names suggests - change the directory you want to work in. It our case the folder with the unzipped files.

Assuming your Mac username is "rommmelll" and that zip file is in your downloads folder, the path should be something like "/Users/rommmelll/Downloads/update_verifier-master". So the command cd /Users/rommmelll/Downloads/update_verifier-master should work.

Hint: you can use the tab key to auto-complete here. Type cd /Users/r and press tab and it should fill in to cd /Users/rommmelll. Terminal app will try to autocomplete everything after the last /, in this case r. If there is more than one option with r it will list them and you can specify it more with rom and press tab again. See this video for example, for a few more details.

Once you've cd'd into that folder you can continue with the python3 command from above.

Note: If you don't specify a full path, something like /Users/rommmelll/some/file.zip, the Terminal app will always expect the files you're referencing in the current directory. So either use cd as mentions above, or use full qualified paths. Use pwd (print working directory) to find out which path you're currently in.

Also have a look at some tutorials regarding the Mac Terminal.

[–] [email protected] 1 points 1 year ago (1 children)

Dear K

I changed the directory as you instructed.

Afterwards, in the CLI, I typed pwd and hit enter.

In reply it showed the path ending in update_verifier-master

I typed python3 update_verifier.py lineageos4microg_pubkey /Users/my user name/Downloads/lineage-18.1-20230614-microG-jfltexx.zip and hit enter

In reply it showed

Traceback (most recent call last): File "/Users/my user name/Downloads/update_verifier-master/update_verifier.py", line 6, in from pyasn1.codec.der.decoder import decode as der_decoder ModuleNotFoundError: No module named 'pyasn1'

Did I do something wrong ?

[–] [email protected] 1 points 1 year ago (1 children)

Please read and understand those prompts. Python missing the module pyasn1 (python3-pyasn1). Its mentioned in the readme as a requirement.

You can install it via pip3 also as described in the readme.

If you don't have pip3 installed on your Mac, I think you can get it via brew. I don't have a Mac myself, so I'm not entirely sure.

[–] [email protected] 2 points 1 year ago (1 children)

Dear K

I found I do have pip3. I installed pyasn1 using pip3.

I tried again, and got an error message. This time I needed rsa. Which I installed using pip3.

I typed python3 update-verifier.py etc.....

In reply it showed

verified successfully

Thankyou very much for taking the time to help me.

Yours sincerely ROMMMELLL

[–] [email protected] 1 points 1 year ago (1 children)

You're welcome. Hope you learned a little.

[–] [email protected] 1 points 1 year ago (1 children)

Dear K

I tried to flash the recovery, but it wouldn't read the file.

Then I remembered what you taught me about changing the directory.

I thought, " Could it hurt to cd into Downloads to tell it where the file is ? "

I ran the CLI command and it flashed the recovery no problem.

The same with the adb sideload.

And now I have LOS4MG on my S4.

Thanks for taking the time to help me.

Yours sincerely ROMMMELLL

[–] [email protected] 1 points 1 year ago* (last edited 1 year ago) (1 children)

Great to hear.

You can always address files via absolute or relative paths.

Relative:

cd /Users/rommmelll/Downloads/
adb sideload lineageos-recovery.img

or absolute:

adb sideload /Users/rommmelll/Downloads/lineageos-recovery.img

Maybe you want to learn a little more about paths to understand how to reference files.

I suggest you read a little further on that topic and play around with the terminal. Find some tutorial videos if that works better for you.

[–] [email protected] 1 points 1 year ago

Thanks K

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