xxxxxxxxxx
#Check a 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