<?php
//funzione per criptare link
function str_crypt($data, $key)
{
  if(strlen($key)<32) $key = md5($key);
  $ld  = strlen($data);
  $lk  = strlen($key);
  for($i=0, $crdata=""; $i<$ld; $i++){
    $crdata .= sprintf("%02X",(ord($data[$i]))^(ord($key[$i%$lk])));
  }
  return $crdata;
}
//funzione per decriptare link
function str_decrypt($cdata, $key)
{
  if(strlen($key)<32) $key = md5($key);
  $ld  = strlen($cdata);
  $lk  = strlen($key);
  for($i=0, $data=""; $i<$ld; $i+=2){
    $data .= chr((hexdec(substr($cdata, $i, 2)))^(ord($key[($i>>1)%$lk])));
  }
  return $data;
}
//password per criptare/decriptare link
$pass_key  = "da.mettere.a.piacere";

// /* Esempio */
$nome = "username=nome&password=passWORD123&type=m3u_plus&output=ts";
$nomecrypt = str_crypt($nome, $pass_key);
$nomedecrypt = str_decrypt($nomecrypt, $pass_key);
// /*  verifica! */
echo "Testo da criptare : ".$nome."<br />";
echo "Password          : ".$pass_key."<br />";
echo "Testo criptato    : ".$nomecrypt."<br />";
echo "Testo decriptato  : ".$nomedecrypt."<br />";
?>