View a certificates' details
openssl x509 -in filename.crt -noout -text
Where filename corresponds to the X.509 certificate file, which typically would end in .crt, .cert or .pem. See also: man x509
Viewing the details of a certificate revocation list (CRL)
openssl crl -in filename -noout -text
Where filename corresponds to the CRL file, which typically would end in .crl or .pem. See also: man crl
DER to PEM conversion
Converts a DER format certificate to PEM - which is more widely used in applications such as apache.
openssl x509 -out exported-pem.crt -outform pem -text -in derfile.crt -inform der
See also: man x509
Generate the hash value from a certificate
Sometimes useful when you want to store multiple CA certificates as separate files in a directory configured into your application.
openssl x509 -hash -noout -in certfile.pem
See also: man x509
Testing STARTTLS
Connects to a mail server and starts TLS session, shows all the server certs (certificate chain) with -showcerts.
openssl s_client -connect test.smtp.org:25 -starttls smtp -showcerts
Note: only support in newer versions of openssl (check man page for -starttls option) See also: man s_client
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