ssh-tools/ssh-keyinfo at master · vaporup/ssh-tools · GitHub

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#!/usr/bin/env bash

# +----------------------------------------------------+
# | Title       : ssh-keyinfo                          |
# | Description : Prints keys in several formats       |
# | Author      : Sven Wick <sven.wick@gmx.de>         |
# | URL         : https://github.com/vaporup/ssh-tools |
# +----------------------------------------------------+

# shellcheck disable=SC2207

#
# Usage/Help message
#

function usage() {

cat << EOF

    Usage: ${0##*/} FILE [...]

    Examples:

        ${0##*/} ~/.ssh/id_rsa.pub

        ${0##*/} ~/.ssh/*.pub

EOF

}

if [[ -z $1 || $1 == "--help" ]]; then
    usage
    exit 1
fi

fingerprint_hashes=( md5 sha256 )

function get_fingerprints () {

  hash_type=$1
  key_file=$2

  ssh-keygen -E "${hash_type}" -qlf "${key_file}" | while IFS= read -r line; do

    key_data=( $(printf '%s\n' "${line}") )
    key_size=${key_data[0]}
    key_hash=${key_data[1]}
    #key_comment=${key_data[2]}
    key_type=${key_data[-1]}
    key_hash_type="${key_hash%%:*}"
    key_hash_data="${key_hash#*:}"

    printf "%10s%6s%8s %-50s %s\n" "${key_type}" "${key_size}" "${key_hash_type}" "${key_hash_data}" "${key_file}"

  done

}

KEYS=( "$@" )

for KEY in "${KEYS[@]}"; do

  for fingerprint_hash in "${fingerprint_hashes[@]}"; do
    get_fingerprints "${fingerprint_hash}" "${KEY}"
  done

done