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@xkr47
Last active June 26, 2024 09:03
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How to use Letsencrypt certificate & private key with Jetty
# input: fullchain.pem and privkey.pem as generated by the "letsencrypt-auto" script when run with
# the "auth" aka "certonly" subcommand
# convert certificate chain + private key to the PKCS#12 file format
openssl pkcs12 -export -out keystore.pkcs12 -in fullchain.pem -inkey privkey.pem
# convert PKCS#12 file into Java keystore format
keytool -importkeystore -srckeystore keystore.pkcs12 -srcstoretype PKCS12 -destkeystore keystore.jks
# don't need the PKCS#12 file anymore
rm keystore.pkcs12
# Now use "keystore.jks" as keystore in jetty with the keystore password you specfied when you ran
# the "keytool" command
@kernelfreak
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Thank you for this. Lifesaver.

@juleskers
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Putting the file into a .jks file isn't necessary. You can load the PKCS #12 file directly:

Indeed, this is a feature of modern JDKs; they have deprecated the proprietary JKS-format in favour of PKCS12, so you can use the PKCS12 output from the openssl-step directly.

You can recognise this from your Keytool output; Your Java can handle PKCS12 keystores if your keytool shows the warning:

The JKS keystore uses a proprietary format. It is recommended to migrate to PKCS12 which is an industry standard format using "keytool -importkeystore -srckeystore keystore.jks -destkeystore keystore.jks -deststoretype pkcs12".

@xkr47
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xkr47 commented Jul 26, 2021

Omg thanks everybody for your nice comments, glad it was of help! :)

16 forks & 56 stars 😲

Thanks @juleskers — yeah things have definately improved a lot since the letsencrypt snowballing started :)

@bakursait2
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Thank you.. That's helped me to figure out how to have the key-certificate thing is done in jetty. It worked with me, though I kept the pkcs12 format and did not convert it to jks.
Actually, I tried first to convert it, but It a warning showed up and advised me to keep using pkcs12.

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