If you need to use a certificate contained in pfx file for httpd f.e. you could use the following to extract what you need:

openssl pkcs12 -in domain.pfx -clcerts -nokeys -out domain.cer
openssl pkcs12 -in domain.pfx -nocerts -nodes  -out domain.key

Hint: Use a password to protect the certificate while exporting it to pfx format. If you didn’t open the certificate on a windows system and follow the import wizard. When it comes to the point where you could enter a passwort, the wizard displays, that it is not needed. Here you can select the „Show password“ button to see the used key. This can be used during openssl export.

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