Create java keystore file from EXISTING private key and certificate

If you start googling for the topic, most of the pages you’ll get will explain you that it is not possible to import private key into java keystore. Usually it is suggested to compile one “magic” file named ImportKey.java, and use it to import private key and cert from DER format. This is ugly because I usually have on server only 2 files (key and certificate) and java installed, so I want to use standard tools.

Only one resource I found that was explaining how to make it possible to import private key: http://nsayer.blogspot.com/2010/02/import-private-key-into-java-keystore.html. But this article didn’t covered for some reason how to make pkcs12 file format. So here I’ll put instructions:

Suppose you have private.key and cert.crt in PEM format, that was signed by authority or you got it externally. Firstly export them into pkcs12 format:

openssl pkcs12 -export -in cert.crt -inkey private.key -certfile cert.crt -name "My certificate" -out keystore.p12

Next, use java keytool command to create keystore in JKS format (or any other that keytool supports):

keytool -importkeystore -srckeystore keystore.p12 -srcstoretype pkcs12 -destkeystore keystore.jks -deststoretype JKS

Thats it. You’ve got it in format that you need it in java.
Compare this for instance with “Old style” suggestions with need to convert into DER format, then use a compiled java class to import into keystore: http://www.agentbob.info/agentbob/79-AB.html