Download this app to your desktop
This is an add-on for the MiXplorer file manager v6.24.1+ to Sign Apk, Zip and Jar files using built-in or custom certificates.
You can also create, view and edit your KeyStores (JKS, BKS, PKCS12, UBER formats).
It does not require root privileges.
For more information see the website: http://forum.xda-developers.com/showthread.php?t=1523691
If you have any idea or suggestion or there is a bug, feel free and send me an email to MiXplorer@gmail.com.