key <key-file>
Use the client private key found in <key-file> in PEM format
or in engine:engine_id format
+ pkcs12 <pkcs12-file>
+ Use a pkcs12 envelope as a substitute for cert and key. A password may be
+ required to use this file.
crl <crl-file>
Use the Certificate Revocation List (CRL) file <crl-file> in PEM format.
crl-dir <dir>