There doesn't seem to be any sort of standard naming convention for OpenSSL certificates, so I'd like to know if there's a simple command to get important information about any OpenSSL certificate, regardless of type. I'd like to know at least the certificate type (x509, RSA, DSA) and whether it's a public or private key. Looking at the contents of a certificate I just extracted from a PKCS12 file, neither of these are explicitly shown.