Extract certificates from .pfx file

The *.pfx file is in PKCS#12 format and includes both the certificate and the private key.

    export the private key:         openssl pkcs12 -in certname.pfx -nocerts -out key.pem -nodes
    export the certificate:           openssl pkcs12 -in certname.pfx -nokeys -out cert.pem
    remove the passphrase from the private key:      openssl rsa -in key.pem -out server.key