EC2 Key Pairs Fingerprinting

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Ever happened to you that you wanted to know which SSH key you need to connect to an AWS EC2 instance? I always found that the fingerprints don’t tell me much, espcially because I always forget how to compute the fingerprints. Good that I’m back to writing, so I’m dumping my memory here:

Why does AWS uses one format and why SSH other? Escapes my current knowledge.