Running the following at the command line:
On Mac/Linux, use the following command:
keytool -genkey -v -keystore ~/upload-keystore.jks -keyalg RSA -keysize 2048 -validity 10000 -alias upload
On Windows, use the following command:
keytool -genkey -v -keystore %userprofile%upload-keystore.jks -storetype JKS -keyalg RSA -keysize 2048 -validity 10000 -alias upload