SSL certificate - compare modulus of certificate vs. private key for equality.

README.md

SSL certificate - compare certificate vs. private key

Or to put it another way...

Does this certificate I have actually work with this private key I have?

Where server.crt is your certificate and server.key is your private key:

$ certMod=$(openssl x509 -text -noout -modulus -in server.crt | grep "Modulus=") && \
	keyMod=$(openssl rsa -text -noout -modulus -in server.key | grep "Modulus=") && \
	[[ $certMod == $keyMod ]] && echo "Equal"

If certificate works with private key - you should be greeted with a response of Equal.