Export Public Key From pkcs12 Container

Everytime I renew my S/MIME certificate I always seem to wind having to consult the OpenSSL man pages to ascertain the approrpiate command to use in order to extract the certificate from the PKCS12 file I get from my certificate authority so I can share said certificate on my contact page. As I’m sure I’m not the only one who winds up having to look this up, I’m sharing it here.

openssl pkcs12 -in container.p12 -clcerts -nokeys -out public.pem

If you then investigate the contents of the PEM file inside a text editor you’ll find your certificate between the BEGIN and END lines – you should share this content on your website or directly with contacts so that your signed e-mails can be verified as to their origin and also so that contacts can encrypt mail such that it can only be read by you if required.

   

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