Identify mismatching public certificates and private keys - allanrogerr/public GitHub Wiki

openssl pkey -in private.crt -pubout -outform pem  
-----BEGIN PUBLIC KEY-----
...
-----END PUBLIC KEY-----
 openssl x509 -in public.crt -pubkey -noout -outform pem
-----BEGIN PUBLIC KEY-----
...
-----END PUBLIC KEY-----

mismatch

echo "LS0...==" | base64 -d | openssl x509 -noout -pubkey | openssl ec -pubin -outform der | openssl dgst -sha256
read EC key
writing EC key
SHA2-256(stdin)= 1234

echo "LS0...==" | base64 -d | openssl ec -pubout -outform der | openssl dgst -sha256
read EC key
writing EC key
SHA2-256(stdin)= 5678

mismatch