Removes passphrase from private key (Supports OpenSSH and RSA)

bare.sh

#!/bin/bash


# Usage:
#    RSA:
#        ./bare.sh my-priv-key -t rsa
#
#    OpenSSH
#        ./bare.sh my-priv-key -t openssh
#
# "my-priv-key.naked" will be generate


function main {
    priv_key="$1"; shift
    priv_key_naked="${priv_key}.naked"

    while [ "$1" != "" ]; do
        case $1 in
            --type | -t) shift
                if [ "$1" = "rsa" ]; then
                    use_rsa "$priv_key" "$priv_key_naked"
                elif [ "$1" = "openssh" ]; then
                    use_openssh "$priv_key" "$priv_key_naked"
                else
                    echo "Unknown Type. Please provide --type=[rsa|openssh]"
                    usage
                    exit 1
                fi
                exit
                ;;
            --help | -h) shift
                usage
                ;;
            *)
                echo "Unkown command"
                usage
                exit 1
                ;;
        esac
        shift
    done

    usage
}

function use_rsa {
    local priv_key="$1"
    local priv_key_naked="$2"
    openssl rsa -in "${priv_key}" -out "${priv_key_naked}"
}

function use_openssh {
    local priv_key="$1"
    local priv_key_naked="$2"
    cp "${priv_key}" "${priv_key_naked}"
    chmod 600 "${priv_key_naked}"
    ssh-keygen -p -f "${priv_key_naked}" -N ""
}

function usage {
    echo "usage: bare.sh my-priv-key --type [rsa|openssh]  | [-h]"
}

main "$@"