system-helpers/usr/local/bin/ssh-keygen-rsa

#!/usr/bin/env bash

set -e;

check_required() {
  type openssl &> /dev/null || { echo "Requiring 'openssl' but it's not installed"; exit 1; }
  type ssh-keygen &> /dev/null || { echo "Requiring 'ssh-keygen' but it's not installed"; exit 1; }
}

name=$1;
encryption=$2;

if [[ -z "${name}" ]]; then
	echo "Usage: ssh-keygen-rsa <name> [<encryptionKeySize>]"
	exit 1;
fi

if [[ -z ${encryption} ]]; then
	encryption=4096;
fi

check_required

openssl genrsa -out "${name}" "${encryption}"
ssh-keygen -y -f "${name}" > "${name}.pub"