How to generate .jks file with .pk8 and .pem

$ openssl pkcs8 -inform DER -nocrypt -in platform.pk8 -out platform.pem

$ openssl pkcs12 -export -in platform.x509.pem -inkey platform.pem -out platform.p12 -password pass:android -name platform

$ keytool -importkeystore -deststorepass android -destkeystore platform.jks -srcstoretype PKCS12 -srcstorepass android -srckeystore platform.p12