Extracting private key and certificate from pfx file

To extract private key:

• openssl pkcs12 -in file.pfx -nocerts -out pk.pem
• openssl rsa -in pk.pem -out key.pem

To extract certificate:

• openssl pkcs12 -in file.pfx -clcerts -nokeys -out cert.pem

To do the opposite

openssl pkcs12 -export -in certificate.crt -inkey certificate.key -out certificate.pfx