Due to the recent OpenSSL issues (Heartbleed) I've been rekeying my SSL certificates and as part of that I've needed to update the Subsonic key. I never remember the steps for this, luckily they were still in my ZSH history. To save myself in future and to help others I've written the process down.
You need to make sure openSSL is installed (and the latest patched version), you will also need zip installed and obviously Subsonic configured and working.
Generate a CSR (Certificate Signing Request) as Namecheap or StartSSL will need this.
openssl req -new -newkey rsa:2048 -nodes -keyout hostname.key -out hostname.csr
Fill out all the needed information, country, town, organisation. The Common name is the full domain name you wish create the SSL cert for. This has to be correct, for example if you run subsonic on homemachine.mydomain.com then enter this here. I didn't bother with passphrase.
When submitting this request remember to choose OpenSSL as the certificate type. You will have to wait for it to be verified, this took a few hours on Namecheap for myself.
Subsonic needs a different key format to the Apache style one, you can convert this with openssl command.
When you get the certificates from the registrar you should have files similar to:
You need to combine these files, along with the hostname.key you generated earlier.
cat hostname.key hostname.crt PositiveSSLCA2.crt AddTrustExternalCARoot.crt > subsonic.crt
Next convert it to a format Subsonic understands.
openssl pkcs12 -in subsonic.crt -export -out subsonic.pkcs12
When prompted enter subsonic as export password.
Now you should have a subsonic.pkcs12 file, we need to import this into a keystore for Subsonic to use.
sudo keytool -importkeystore -srckeystore subsonic.pkcs12 -destkeystore subsonic.keystore -srcstoretype PKCS12 -srcstorepass subsonic -srcalias 1 -destalias subsonic
When prompted enter subsonic as the password.
Finally we need to put the keystore into the file Subsonic uses to boot.
sudo zip /var/subsonic/subsonic-booter-jar-with-dependencies.jar subsonic.keystore
note: Your paths may differ, these are default for Archlinux
Finally you will need to enable SSL in Subsonic, if you haven't done so already.
sudo vim /var/subsonic/subsonic.sh # Change SUBSONIC_HTTPS_PORT=0 to the port you want to use for SSL.
Now restart Subsonic
sudo systemctl restart subsonic
Congratulations, you now have a valid and secure Subsonic installation.