magento 1.9.x: create customer password manually

magento_password_hash.php

<?php
// salt random string
// see formula: app/code/core/Mage/Core/Helper/Data.php method getRandomString
function salt($len = 32) {
    $chars_lowers = 'abcdefghijklmnopqrstuvwxyz';
    $chars_uppers = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
    $charts_digits = '0123456789';

    $chars = $chars_lowers . $chars_uppers . $charts_digits;
    for ($i = 0, $str = '', $lc = strlen($chars)-1; $i < $len; $i++) {
        $str .= $chars[mt_rand(0, $lc)];
    }
    return $str;
}
                                                              
$password = 'topsecret';
$salt = salt();
$resultPassword = md5($salt . $password) . ':' . $salt;

// dump password
var_dump($resultPassword);