Check a Certificate Signing Request (CSR)
$openssl req -text -noout -verify -in CSR.csr
Check a private key
$openssl rsa -in privateKey.key -check
Check a certificate
$openssl x509 -in certificate.crt -text -noout
Check a PKCS#12 file (.pfx or .p12)
$openssl pkcs12 -info -in keyStore.p12
