You can check to make sure that you your ssl’s private key and ssl certificate are in the correct format and match each other. To do this, give the commands below to decrypt the private key in one terminal window and decrypt the certificate in the other.
What you will be comparing are the Modulus and the Exponent of each key. If the modulus and exponent from the key matches the set from the certificate, you have just confirmed that your certificate and key are correctly paired.
To view the contents of the certificate:
[server][user][~]$ openssl x509 -noout -text -in filename.crt
To view the contents of the private key:
[server][user][~]$ openssl rsa -noout -text -in filename.key