Create EC2 fingerprints for local PEM files

ec2-fingerprint-key.sh

#! /bin/sh
# q.v. http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/ec2-key-pairs.html#verify-key-pair-fingerprints
for i in "$@"
do
    echo "== $i =="
    echo "  if *AWS* generated the key, it's fingerprint will be:"
    openssl pkcs8 -in "$i" -inform PEM -outform DER -topk8 -nocrypt | openssl sha1 -c
    echo "  if *you* generated the key, it's fingerprint will be:"
    openssl rsa -in "$i" -pubout -outform DER 2>/dev/null | openssl md5 -c
    echo
done