#!/bin/bash

#### Functions
check_root() {
    if [ "$EUID" -ne 0 ]; then
        echo "Must be root to run $0"
        exit
    fi
}

choice() {
    echo -ne "[y/n]"
    while true
    do
        read -rN1 input
    case $input in
        [yY][eE][sS]|[yY])
        return 0

    break
    ;;
        [nN][oO]|[nN])
        return 1
        ;;
        esac
    done
}

#### Main

check_root

echo -ne "\nReset sshd server key ? "
if choice 2>/dev/null; then
    echo -ne "\nDelete key ...\n"
    rm /etc/ssh/ssh_host_*
    echo -ne "\nGenerate key ...\n"
    dpkg-reconfigure openssh-server
    systemctl restart sshd
    systemctl status sshd    
fi