-----BEGIN RSA PRIVATE KEY-----

-----END RSA PRIVATE KEY-----

openssl rsa -in privateKey.key -check

RSA key ok
writing RSA key

openssl x509 -noout -modulus -in certificate.crt | openssl md5
openssl rsa -noout -modulus -in privateKey.key | openssl md5

openssl pkcs12 -info -in keyStore.p12