Android app signing with Google Play upload key/certificate (.des)

25/08/2020

The steps one need to take are:

1. create a keystore (this is a process which is described in many places) 2. add the .des certificate to this keystore 3. use the keystore to sign your unsigned-zipalign-release.apk

The main breakthrough was this Signing an APK with Google Play upload key page I found and then the link in the comments to Generate a keystore

keytool -genkey -v -keystore .jks -keyalg RSA -keysize 2048 - validity 10000 -alias 

Add .des certificate to keystore

keytool -importcert -file .der -keystore .jks

If you need you can sign your apk

apksigner sign --ks .jks .apk