Original PHP function from WordPress PrivateContent (users_manag.php:930):

encrypt_psw.js

// Original PHP function from WordPress PrivateContent (users_manag.php:930):
//
// public function encrypt_psw($psw) {
//   return base64_encode( serialize( array(base64_encode($psw), md5(sha1(10091988*strlen($psw))) )));
// }

var Base64 = require('js-base64').Base64;
var PHPSer = require('php-serialize');
var crypto = require('crypto');
var md5 = require('md5');
var enc = Base64.encode;
var ser = PHPSer.serialize;

exports = module.exports = encrypt_psw;

var DEFAULT_SALT = exports.DEFAULT_SALT = 10091988;

function encrypt_psw(p, salt) {
  return typeof p === 'string' && enc(ser([enc(p), md5(sha1((salt || DEFAULT_SALT)*p.length))]));
}

function sha1(str) {
  return crypto.createHash('sha1').update(''+str, 'utf8').digest('hex');
}