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Created January 27, 2020 08:41
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Verifying AWS EC2 Key Pair's Fingerprint
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verify-aws-ec2-key-pair-fingerprint.md

If you created your key pair using AWS, you can use the OpenSSL tools to generate a fingerprint as follows:

$ openssl pkcs8 -in path_to_private_key -inform PEM -outform DER -topk8 -nocrypt | openssl sha1 -c

If you created a key pair using a third-party tool and uploaded the public key to AWS, you can use the OpenSSL tools to generate the fingerprint as follows:

$ openssl rsa -in path_to_private_key -pubout -outform DER | openssl md5 -c

If you created an OpenSSH key pair using OpenSSH 7.8 or later and uploaded the public key to AWS, you can use ssh-keygen to generate the fingerprint as follows:

$ ssh-keygen -ef path_to_private_key -m PEM | openssl rsa -RSAPublicKey_in -outform DER | openssl md5 -c

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

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