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If you used CreateKeyPair to create the key pair:
- For RSA key pairs, the key fingerprint is the SHA-1 digest of the DER encoded private key.
- For ED25519 key pairs, the key fingerprint is the base64-encoded SHA-256 digest, which is the default for OpenSSH, starting with OpenSSH 6.8.
If you used ImportKeyPair to provide Amazon Web Services the public key:
- For RSA key pairs, the key fingerprint is the MD5 public key fingerprint as specified in section 4 of RFC4716.
- For ED25519 key pairs, the key fingerprint is the base64-encoded SHA-256 digest, which is the default for OpenSSH, starting with OpenSSH 6.8.