#!/usr/bin/env bash

md5=false
key=""

# command-line parameters
for prm in "$@"; do
    if [ "${prm:0:1}" == "-" ]; then
        if [ "$prm" == "-5" ] || [ "$prm" == "--md5" ]; then
            md5=true
        fi
    else
        key="$prm"
    fi
done

if [ "$key" == "" ]; then echo "Usage: $0 [ -5 | --md5 ] <key>"; exit 1; fi

if [ "$md5" == true ]; then
    ssh-keygen -E md5 -lf "$key"
else
    ssh-keygen -lf "$key"
fi