Apache Reference: mod_ssl, SSLCertificateKeyFile
Server PEM-Encoded Private Key File
Syntax: SSLCertificateKeyFile A
Example: SSLCertificateKeyFile etc/ssl/host.key
Since: Apache 1.3
This directive points with file to the PEM-encoded RSA or DSA
private key file for the server. If the private key is not
combined with the Certificate in SSLCertificateFile, use
this directive to point to the file with the stand-alone private
key. If SSLCertificate==File is used and the file contains
both the certificate and the private key, this directive
is unnecessary. We strongly discourage this practice. For
security reasons, we recommende separating the certificate
and the private key.> If the private key is encrypted, the
pass phrase dialog (-> SSLPassPhraseDialog) is forced at
start-up. This directive can be used a maximum of two times
(referencing different file names) when both RSA- and DSA-based
private keys are used in parallel.