AWS: EC2: Create Signature from Private Key - EC2 to verify if its the same one

openssl pkcs8 -in ./ProjKey.pem -inform PEM -outform DER -topk8 -nocrypt | openssl sha1 -c

https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html#verify-key-pair-fingerprints