For creating your own Keystore
go to C:\Program Files\Java\jdk1.6.0\bin
and execute below command
C:\Program Files\Java\jdk1.6.0\bin>keytool -genkey -v -keystore app.keystore -alias app -keyalg RSA -keysize 2048 -validity 300000
It'll created your app.keystore
in C:\Program Files\Java\jdk1.6.0\bin
directory and by using this keystore
you can sign you application. You must keep this keystore
safe because of your app next update.
Update: command for generate SHA-1 from your app.keystore
D:>keytool -v -list -alias app -keystore "D:app.keystore" -storepass app -keypass app