xenxynon/Signing-Script

Generating the keys

On root directory of your rom, run:

croot
git clone https://github.com/baka-hokage/Signing-Script.git -b master scripts
bash scripts/generate_key.sh

Generating an install package

After Generating the keys, instead of running brunch , run the following:

lunch <codename>
m target-files-package otatools

Signing target files

After it’s finished, you just need to sign all the APKs:

croot 
sign_target_files_apks -o -d ~/.android-certs \
    $OUT/obj/PACKAGING/target_files_intermediates/*-target_files-*.zip \
    signed-target_files.zip

Generating the install package

Now, to generate the installable zip, run:

ota_from_target_files -k ~/.android-certs/releasekey \
    signed-target_files.zip \
    signed-ota_update.zip

All the references are from:

AOSP & LineageOS