#!/usr/bin/env node

var program = require('commander');
var RandomString = require("randomstring");
var Util = require("util");
var crypt = require("crypt3");

function ssha512(password, saltSize, rounds) {
  // $6 means SHA512
  const _salt = Util.format("$6$rounds=%d$%s", rounds,
    RandomString.generate(saltSize));

  const hash = crypt(password, _salt);
  return Util.format("{CRYPT}%s", hash);
}

let password;

program
  .option('-s, --salt <size>', 'The size of the salt to generate.')
  .option('-r, --rounds <rounds>', 'The number of rounds.')
  .arguments('<password>')
  .action(function (_password) {
    password = _password;
  })
  .parse(process.argv);

if (!password) {
  program.help();
}

console.log(ssha512(password, program.salt || 16, program.rounds || 500000));