Replicating .NET Password Hashing in PHP

HashDotNetPassword.php

// From http://gilbert.pellegrom.me/replicating-net-password-hashing-in-php/

/*
 * $password is the users password entered at login
 * $hashed_password is the password from the database
 * $password_salt is the salt from the database
 */
$bytes = mb_convert_encoding($password, 'UTF-16LE');
$salt = base64_decode($password_salt);
$password = base64_encode(sha1($salt . $bytes, true));

if ($password == $hashed_password) return true;
else return false;