I've had to look this up a number of times, so I'm posting it here for posterity.
source:
http://www.markbrilman.nl/2011/08/howto-convert-a-pfx-to-a-seperate-key-crt-file/
`openssl pkcs12 -in [yourfile.pfx] -nocerts -out
[keyfile-encrypted.key]`
What this command does is extract the private key from the .pfx file.
Once entered you need to type in the importpassword of the .pfx file. This is the password that you used to protect
your keypair when you created your .pfx file.
If you cannot remember it anymore you can just throw your .pfx file
away, cause you won’t be able to import it again, anywhere!. Once you entered the import password OpenSSL
requests you to type in another password, twice!. This new password will
protect your .key file.
Now let’s extract the certificate:
`openssl pkcs12 -in [yourfile.pfx] -clcerts -nokeys -out
[certificate.crt]`
Just press enter and your certificate appears.
Now as I mentioned in the intro of this article you sometimes need to
have an unencrypted .key file to import on some devices. I probably don’t need to mention that you
should be careful. If you store your unencrypted keypair somewhere on an
unsafe location anyone can have a go with it and impersonate for instance a
website or a person of your company. So
always be extra careful when it comes to private keys! Just throw the
unencrypted keyfile away when you’re done with it, saving just the encrypted
one.
The command:
`openssl rsa -in [keyfile-encrypted.key] -out [keyfile-decrypted.key]`
Notes:
- When you first extract the key, apply a new password (probably the
same as you used to extract it) and then create an unencrypted key with the rsa
command above
- Use an encrypted key file for NGINX otherwise it'll ask for the
password every time it is restarted.
- Check the top of the extract .crt file for extra bits above the
----BEING... line and remove if necessary
- This certificated needs to be concatenated with the full chain of
certificate authorities `cat domain.crt CA_bundle.crt > final.crt`
- test the cert with `openssl s_client -showcerts -connect
www.domain.com:443`
Addendum:
To convert a PFX file to a PEM files:
`openssl pkcs12 -in [yourfile.pfx] -out [certificate.pem] -clcerts
`openssl pkcs12 -in [yourfile.pfx] -out [cacerts.pem] -cacerts
To convert a PFX file to a combined PEM file in one step AND remove encryption:
'openssl pkcs12 -in [yourfile.pfx] -out [decrypted.pem] -nodes'
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